January 22, 2002 TOKO, Inc. Page 1
TK740xxL
BLOCK DIAGRAM
TK740xxL
DUAL LOW DROPOUT VOLTAGE REGULATOR
FEATURES APPLICATIONS
nBattery Powered Systems
nMeasurement Systems
nMobile Communications Systems
nCellular Phones
nCordless Phones
nPDAs
nToy Motor Drivers
DESCRIPTION
n2 Channel LDO in one Package
nOutputs can be set by External Resistors
nHigh Precision Output Voltage (± 2.0 % or ± 60 mV)
nIndependent Active High On/Off Control for each LDO
nVery Low Dropout Voltage (VDROPA = 90 mV at 100 mA,
VDROPB = 80 mV at 50 mA)
nStable with Ceramic Capacitors
nExcellent Ripple Rejection Ratio (84 dB @ 400 Hz)
n1 µµ
µµ
µA at Shutdown
nPeak Output Current is 370 mA
nSOT23L-8 Package
nWide Operating Voltage Range (1.8 V ~ 14.5 V)
nReverse Bias and Overcurrent Protection
nBuilt-in Thermal Shutdown
8
GND
VIN
ON/OFF CONTROL A
VOUTA
VOUTB
FBA
FBB ON/OFF CONTROL B
The TK740xx is a Dual Ultra Low-Drop-Out regulator with a
built-in electronic switch. The A-Side delivers up to 200 mA
output current and the B-Side delivers up to 120 mA output
current over the full temperature range. The internal switch
can be controlled by TTL or CMOS logic levels. The device
is in the “on” state when the control pin is pulled to a logic
high level. External capacitors can be connected between
the FBA and VOUTA and FBB and VOUTB pins to lower the output
noise level.
Internal PNP pass transistors are used to achieve a low
dropout voltage of 90 mV (typ.) at 100 mA load current side
A and 80 mV (typ.) at 50 mA load current side B. The
TK740xx has very low quiescent current. 45 µA at no load
and 0.4 mA with a 50 mA load. The internal thermal shut
down circuitry limits the junction temperature to 150 °C. The
load current is internally monitored and the device will shut
down in the presence of a short circuit or overcurrent
condition at the output.
The TK740xx circuit features very high stability. An output
capacitor of 0.22 mF provides stable operation for VOUT ³ 2.0
V. Any type of capacitor can be used; however, the larger
this capacitor is, the better the overall characteristics are.
The ripple rejection ratio is 84 dB at 400 Hz, and 80 dB at
1 kHz.
The TK740xx is available in the SOT23L-8 surface mount
package.
GND
BANDGAP
REFERENCE
GND
BANDGAP
REFERENCE
FBA
VIN
VOUT A VOUT B
FBB
ON / OFF
CONTROL
A B
THERMAL &
OVER CURRENT
PROTECTION
RIN = 300 kΩ
TK740 CL-
ORDERING INFORMATION
Package Code
PACKAGE CODE:
S: SOT23L-8
VOLTAGE CODES:
Refer to Table 1
Temp. Code Tape/Reel Code
TEMP. CODE:
C: -30 to 80°C
I: -40 to 85°C
TAPE/REEL CODE:
L: Tape Left
Reel Size = 1300 pcs.
B Side Voltage Code
A Side Voltage Code
Page 2 January 22, 2002 TOKO, Inc.
TK740xxL
ABSOLUTE MAXIMUM RATINGS - C RANK
Supply Voltage............................................... -0.4 to16 V
Power Dissipation .............................................. 600 mW
Reverse Bias Voltage ................................... -0.4 to 10 V
Operating Voltage Range ............................ 1.8 to 14.5 V
Storage Temperature Range .....................-55 to +150 °C
Operating Temperature Range.....................-30 to +80 °C
Noise Bypass Pin Voltage .............................. -0.4 to 5 V
Control Pin Voltage ......................................-0.4 to VOP V
Short Circuit Current (A Side).............................. 430 mA
Short Circuit Current (B Side).............................. 330 mA
TK740xx ELECTRICAL CHARACTERISTICS - C RANK
Test conditions: TA = 25 °C, VIN = VOUT(TYP) + 1 V, IOUT = 1 mA
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COMMON
SIDEA
SIDEB
January 22, 2002 TOKO, Inc. Page 3
TK740xxL
TK740xx ELECTRICAL CHARACTERISTICS - C RANK (CONT.)
Test conditions: TA = 25 °C, VIN = VOUT(TYP) + 1 V, IOUT = 1 mA
Note 1: This value depends on the output voltage. This is a reference value for a 3V output device. The details of each device are described
in the individual specifications.
Note 2: The output current is limited by the power dissipation of the total of both sides.
Note 3: Pull down resistor for control terminal is not built in.
General Note: Parameters with only typical values are just reference. (Not guaranteed)
General Note: Limits are guaranteed by production testing or correction techniques using Statistical Quality Control (SQC) methods. Unless
otherwise noted. VIN = VOUT(TYP) + 1V; IOUT= 1 mA (Tj = 25°C) The operation of -30° to 80°C is guaranteed in the design by a usual
inspection.
General Note: Exceeding the “Absolute Maximum Rating” may damage the device.
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N
10.0= m,F
V
ESION
Vm002=
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V,
NI
V=
)PYT(TUO
+
I,V5.1
TUO
Am01= 48Bd
0.1=LC,zHk1=f mC,F
N
10.0= m,F
V
ESION
Vm002=
SMR
V,
NI
V=
)PYT(TUO
+
I,V5.1
TUO
Am01= 08Bd
Page 4 January 22, 2002 TOKO, Inc.
TK740xxL
ABSOLUTE MAXIMUM RATINGS - I RANK
TK740xx ELECTRICAL CHARACTERISTICS - I RANK
Test conditions: TA = 25 °C, Bold typeface applies over the -40°C to 85°C Ambient Temperature Range. Operational
Voltage Range is (2.1 V £ VOP £ 14 V). Unless otherwise noted. VIN = VOUT(TYP) + 1 V, IOUT = 1 mA
LOBMYSRETEMARAPSNOITIDNOCTSETNIM PYT XAMSTINU
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TUO
egatloVtuptuOI
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NI
V=
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TUO
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V81=
0.00.5 0.7 Vm
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Q
tnerruCtnecseiuQI
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TNOC
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I
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CC
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BF
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TUO
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A
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TNOC
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edoMNOV8.1= 8.15
7mA
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FFOtuptuO 8.0 6.0 V
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I
TUO
Am002otAm5= 330709 Vm
V
PORD
egatloVtuoporD
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TUO
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I
TUO
Am051= 521081 032 Vm
I
TUO
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COMMON
SIDEA
Supply Voltage............................................... -0.4 to16 V
Power Dissipation .............................................. 600 mW
Reverse Bias Voltage ................................... -0.4 to 10 V
Operating Voltage Range ............................... 2.1 to 14 V
Storage Temperature Range .....................-55 to +150 °C
Operating Temperature Range.....................-40 to +85 °C
Noise Bypass Pin Voltage .............................. -0.4 to 5 V
Control Pin Voltage ......................................-0.4 to VOP V
Short Circuit Current (A Side).............................. 430 mA
Short Circuit Current (B Side).............................. 330 mA
January 22, 2002 TOKO, Inc. Page 5
TK740xxL
TK740xx ELECTRICAL CHARACTERISTICS (I RANK) (CONT.)
Test conditions: TA = 25 °C, Bold typeface applies over the -40°C to 85°C Ambient Temperature Range. Operational
Voltage Range is (2.1 V £ VOP £ 14 V). Unless otherwise noted. VIN = VOUT(TYP) + 1 V, IOUT = 1 mA
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TUO
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V
PORD
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TUO
Am05= 08521 571 Vm
I
TUO
Am001= 531022 082 Vm
I
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TUO
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)2etoN(9.0x 091 051 083 Am
RRnoitcejeRelppiR
0.1=LC,zH004=f mC,F
N
10.0=
mV,F
ESION
Vm002=
SMR
V,
NI
=
V
)PYT(TUO
I,V5.1+
TUO
Am01=
48 Bd
0.1=LC,zHk1=f mC,F
N
10.0=
mV,F
ESION
Vm002=
SMR
V,
NI
=
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Am01=
08 Bd
SIDEB
Note 1: This value depends on the output voltage. This is a reference value for a 3V output device. The details of each device are described
in the individual specifications.
Note 2: The output current is limited by the power dissipation of the total of both sides.
Note 3: Pull down resistor for control terminal is not built in.
General Note: Parameters with only typical values are just reference. (Not guaranteed)
General Note: Limits are guaranteed by production testing or correction techniques using Statistical Quality Control (SQC) methods. Unless
otherwise noted. VIN = VOUT(TYP) + 1V; IOUT= 1 mA (Tj = 25°C) The operation of -40° to 85°C is guaranteed in the design by a usual
inspection.
General Note: Exceeding the “Absolute Maximum Rating” may damage the device.
Page 6 January 22, 2002 TOKO, Inc.
TK740xxL
TK740xx ELECTRICAL CHARACTERISTICS TABLE 1
Test Conditions: VIN = VOUT(TYP) + 1 V, IOUT = 5 mA, TA = 25 °C, unless otherwise specified.
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TUO
xaMV
TUO
niMV
TUO
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V3.131V042.1V063.1
V4.141V043.1V064.1
*
V5.151V044.1V065.1
V6.161V045.1V066.1
V7.171V046.1V067.1
*
V8.181V047.1V068.1V027.1V088.1
*
V9.191V048.1V069.1
*
V0.202V049.1V060.2V029.1V080.2
V1.212V040.2V061.2V020.2V081.2
*
V2.222V041.2V062.2V021.2V082.2
V3.232V042.2V063.2V022.2V083.2
V4.242V043.2V064.2V023.2V084.2
*
V5.252V044.2V065.2V024.2V085.2
V6.262V045.2V066.2V025.2V086.2
*
V7.272V046.2V067.2V026.2V087.2
*
V8.282V047.2V068.2V027.2V088.2
*
V9.292V048.2V069.2V028.2V089.2
*
V0.303V049.2V060.3V029.2V080.3
*
V1.313V830.3V261.3V020.3V081.3
*
V2.323V631.3V462.3V021.3V082.3
January 22, 2002 TOKO, Inc. Page 7
TK740xxL
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V3.333V432.3V663.3V022.3V083.3
V4.343V232.3V864.3V023.3V084.3
*
V5.353V034.3075.3V024.3V085.3
*
V6.363V825.3V276.3V025.3V086.3
V7.373V626.3V477.3V026.3V087.3
*
V8.383V427.3V678.3V027.3V088.3
V9.393V228.3V879.3V028.3V089.3
*
V0.404V029.3V080.4V019.3V090.4
V1.414V810.4V281.4V900.4V191.4
V2.424V611.4V482.4V801.4V292.4
V3.434V412.4V683.4V791.4V393.4
V4.444V213.4V884.4V603.4V494.4
*
V5.454V014.4V095.4V504.4V595.4
V6.464V805.4V296.4V405.4V696.4
*
V7.474V606.4V497.4V606.4V797.4
V8.484V407.4V698.4V207.4V898.4
V9.494V208.4V899.4V108.4V999.4
*
V0.505V009.4V001.5V009.4V001.5
TK740xx ELECTRICAL CHARACTERISTICS TABLE 1 (CONT)
Test Conditions: VIN = VOUT(TYP) + 1 V, IOUT = 5 mA, TA = 25 °C, unless otherwise specified.
Page 8 January 22, 2002 TOKO, Inc.
TK740xxL
TEST CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
A and B: COMMON CHARACTERISTICS
GND
VIN
CONT A
0.01 µF
CONT B
4
8
VOUTB
VOUTA
CL B
0.1 µFCL A
0.1 µF
ISTBY(A)
VCC (V)
0 10 20
1E-6
1E-7
1E-8
STANDBY CURRENT vs. VIN
(OFF MODE)
1E-9
1E-10
VOUT(TYP)
VIN (V)
0 10 20
LINE REGULATION
1 mV/DIV
ICONT(µA)
VCONT(V)
0 5.0 10
CONTROL CURRENT vs.
CONTROL VOLTAGE
IOUT = 0 mA
0
25
50
ICONT
VOUT
ICONT(
µ
A)
TA(°C)
-50 0 50 100
CONTROL CURRENT vs.
TEMPERATURE
0
2
5
1
3
4
VCONT = 1.8 V
VCONT(V)
TA(°C)
-50 0 50 100
CONTROL VOLTAGE
(VOUT’ ON/OFF POINT)
vs. TEMPERATURE
0
2
1
OFF
ON
IQ(mA)
VIN (V)
0 10 20
3.0
2.0
1.0
QUIESCENT CURRENT vs. VIN
(ON MODE) IOUT = 0 mA
0
VOUT = 3 V
VOUT = 4 V
VOUT = 5 V
January 22, 2002 TOKO, Inc. Page 9
TK740xxL
TYPICAL PERFORMANCE CHARACTERISTICS (CONT)
SIDE A SIDE B
VOUT(V)
IOUT(mA)
0 100 200 300 400 500
SHORT CIRCUIT CURRENT A
0.0
3.5
2.0
1.0
1.5
2.5
3.0
0.5
VOUT(V)
IOUT(mA)
0 100 200 300 400 500
SHORT CIRCUIT CURRENT B
0.0
3.5
2.0
1.0
1.5
2.5
3.0
0.5
VOUT(V)
IOUT(mA)
0 50 100 150 200
LOAD REGULATION A
2.90
3.04
2.98
2.94
2.96
3.00
3.02
2.92
VOUT(V)
IOUT(mA)
0 50 100 150 200
LOAD REGULATION B
2.90
3.04
2.98
2.94
2.96
3.00
3.02
2.92
VOUT(TYP)
VIN vs. VOUT A
VIN (100 mV/DIV)
IOUT = 0, 50, 100, 150, 200, 250 (mA)
in 50 mA STEPS
IOUT = 250 mA
IOUT = 0 mA
VIN = VOUT
VOUT(25mV/DIV)
VIN vs. VOUT B
IOUT = 0, 50, 100, 150, 200 (mA)
in 50 mA STEPS
IOUT = 200 mA
IOUT = 0 mA
VOUT(TYP)
VIN (100 mV/DIV)
VIN = VOUT
VOUT(25mV/DIV)
Page 10 January 22, 2002 TOKO, Inc.
TK740xxL
TYPICAL PERFORMANCE CHARACTERISTICS (CONT)
SIDE A SIDE B
VDROP(V)
IOUT(mA)
0 50 100 150 200
DROPOUT VOLTAGE A
-0.20
0
-0.10
-0.15
-0.05
VDROP(V)
IOUT(mA)
0 50 100 150 200
DROPOUT VOLTAGE B
-0.20
0
-0.10
-0.15
-0.05
IGND(mA)
IOUT(mA)
0 100 200
6
4
2
GROUND PIN CURRENT vs.
OUTPUT CURRENT A
0
8
10
IGND(mA)
IOUT(mA)
0 100 200
6
4
2
GROUND PIN CURRENT vs.
OUTPUT CURRENT B
0
8
10
January 22, 2002 TOKO, Inc. Page 11
TK740xxL
SIDE A SIDE B
TYPICAL PERFORMANCE CHARACTERISTICS (CONT)
AMBIENT TEMPERATURE BEHAVIOR
IGND(mA)
TA(°C)
-40 -20 0 20 40 60 80 100
6
4
2
GROUND PIN CURRENT vs.
TEMPERATURE
0
8
10
9
7
5
3
1
IOUT = 100 mA
VDROP(mV)
TA(°C)
-40 -20 0 20 40 60 80 100
200
DROPOUT VOLTAGE vs.
TEMPERATURE
0
250
300
150
100
50
IOUT = 200 mA
IOUT = 100 mA
VDROP(mV)
TA(°C)
-40 -20 0 20 40 60 80 100
200
DROPOUT VOLTAGE vs.
TEMPERATURE
0
250
300
150
100
50
IOUT = 100 mA
IOUT = 50 mA
IOUT(mA)
TA(°C)
-40 -20 0 20 40 60 80 100
300
200
100
MAXIMUM OUTPUT CURRENT
vs. TEMPERATURE
0
400
500
TA(°C)
-40 -20 0 20 40 60 80 100
300
200
100
MAXIMUM OUTPUT CURRENT
vs. TEMPERATURE
0
400
500
IOUT(mA)
IGND(mA)
TA(°C)
-40 -20 0 20 40 60 80 100
6
4
2
GROUND PIN CURRENT vs.
TEMPERATURE
0
8
10
9
7
5
3
1
IOUT = 200 mA
IOUT = 100 mA
Page 12 January 22, 2002 TOKO, Inc.
TK740xxL
TYPICAL PERFORMANCE CHARACTERISTICS (CONT)
OUTPUT VOLTAGE TEMPERATURE BEHAVIOR
VOUT
TA(°C)
-40 -20 0 20 40 60 80 100
3.990
3.980
3.970
TK74040M
3.960
4.000
4.010
4.005
3.995
3.985
3.975
3.965
VOUT
TA(°C)
-40 -20 0 20 40 60 80 100
4.990
4.980
4.970
TK74050M
4.960
5.000
5.010
5.005
4.995
4.985
4.975
4.965
VOUT
TA(°C)
-40 -20 0 20 40 60 80 100
1.990
1.980
1.970
TK74020M
1.960
5.000
2.010
2.005
1.995
1.985
1.975
1.965
VOUT
TA(°C)
-40 -20 0 20 40 60 80 100
1.800
1.790
1.780
TK74018M
1.770
1.810
1.820
1.815
1.805
1.795
1.785
1.775
VOUT
TA(°C)
-40 -20 0 20 40 60 80 100
2.890
2.880
2.870
TK74028M
2.860
2.800
2.810
2.805
2.895
2.885
2.875
2.865
VOUT
TA(°C)
-40 -20 0 20 40 60 80 100
2.990
2.980
2.970
TK74030M
2.960
3.000
3.010
3.005
2.995
2.985
2.975
2.965
January 22, 2002 TOKO, Inc. Page 13
TK740xxL
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
Ripple Rejection (Tk74030M)
Conditions:
VIN = 4.0 V
VRIPPLE = 500 mVp-p
CIN = 0 mF
IOUT = 10 mA
COUT = 1.0 mF (MLCC)
CFB = 4700 pF
The Ripple Rejection characteristic improves by enlarging the capacitor on the output side. The characteristic of
the high frequency area is decided by the characteristic of the output side capacitor.
With CFB
CL = 1.0 µF(MLCC)
CFB =0
CFB = 4700 pF
0.1 1 10 100 1000
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
RR(dB)
FREQUENCY(kHz)
CL = 0.1 µF
(MLCC)
CL = 1.0 µF
(MLCC)
0.1 1 10 100 1000
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
RR(dB)
FREQUENCY(kHz)
CL = 0.1 µF
(MLCC)
CL = 1.0 µF
(Tantalum)
0.1 1 10 100 1000
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
RR(dB)
FREQUENCY(kHz)
CFB
4700 pF
CL
VIN VOUT
VCONT
GND
740xx
GND
200 mVp-p
Input Wave Form
VIN
Page 14 January 22, 2002 TOKO, Inc.
TK740xxL
Without CFB
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
Ripple Rejection When I/O Voltage difference is few
When the difference between the input voltage and the output voltage decreases, the Ripple Rejection characteristic is
different in Side A and Side B. The characteristic on the A side (where the power transistor is large) improves.
dB
VIN = VOUT
+0.2 V +0.4 V +0.6 V
-40
-60
-80
RIPPLE REJECTION vs. VIN
(SIDE A)
-100
-20
0
-10
-30
-50
-70
-90
10 KHz, 100 mA
1 KHz, 100 mA
10 KHz, 10 mA
1 KHz, 10 mA
CL = 0.22 µF
CFB = 4700 pF
dB
VIN = VOUT
+0.2 V +0.4 V +0.6 V
-40
-60
-80
RIPPLE REJECTION vs. VIN
(SIDE B)
-100
-20
0
-10
-30
-50
-70
-90
10 KHz, 100 mA
1 KHz, 100 mA
10 KHz, 10 mA
1 KHz, 10 mA
CL = 0.22 µF
CFB = 4700 pF
dB
VIN = VOUT
+0.2 V +0.4 V +0.6 V
-40
-60
-80
RIPPLE REJECTION vs. VIN
(SIDE A)
-100
-20
0
-10
-30
-50
-70
-90
10 KHz, 100 mA
1 KHz, 100 mA
10 KHz, 10 mA
1 KHz, 10 mA
CL = 0.22 µF
CFB = None
dB
VIN = VOUT
+0.2 V +0.4 V +0.6 V
-40
-60
-80
RIPPLE REJECTION vs. VIN
(SIDE B)
-100
-20
0
-10
-30
-50
-70
-90
10 KHz, 100 mA
1 KHz, 100 mA
10 KHz, 10 mA
1 KHz, 10 mA
CL = 0.22 µF
CFB = None
CFB
0 pF
CL
VIN VOUT
VCONT
GND
740xx
GND
200 mVp-p
Input Wave Form
VIN
January 22, 2002 TOKO, Inc. Page 15
TK740xxL
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
OUTPUT NOISE
The noise in the low current region decreases when a tantalum capacitor is used. As for the output side capacitor, a tantalum
capacitor of 0.1 mF is recommended. The characteristic of the capacitor greatly influences the amount of the noise.
NOISE (µVRMS)
IOUT(mA)
0 50 100 150 200
250
150
NOISE DENSITY vs. IOUT
(TK74030M)
0
300
400
350
200
100
50
♦
♥♠♣
♣
♠
♥♦♣
♦
♥
♠
ch A 1.0 µF (MLCC)
ch B 1.0 µF (MLCC)
ch A 1.0 µF (Tantalum)
ch B 1.0 µF (Tantalum)
Conditions
VIN = 4.0 V
CIN = 0.1 µF (Tanalum)
CFB = 4700 pF (Ceramic)
NOISE (µVRMS)
CL(µF)
0.1 1 10
250
150
NOISE DENSITY vs. CL
(TK74030M)
0
300
400
350
200
100
50
♦
♥
♠♣
♣♠
♥♦
Conditions
VIN=4.0V
CIN=0.1µF (Tanalum)
IOUT=200mA(ch A)
IOUT=100mA(ch B)
♣
♦
♥
♠
ch A CFB=0
ch B CFB=472
ch A CFB=0
ch B CFB=472
Page 16 January 22, 2002 TOKO, Inc.
TK740xxL
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
Line Transient
VIN = 4 V to 5 V to 4 V, CIN = 1.0 µF(MLCC), CFB = 4700 pF
VIN
VOUTA
VOUTA
VOUTA
VIN
VOUTA
VOUTA
VOUTA
VIN
VOUTB
VOUTB
VOUTB
VIN
VOUTB
VOUTB
VOUTB
A Side (IOUT = 100 mA) B Side (IOUT = 50 mA)
10 mV/div
25 µs/div
10 mV/div
25 µs/div
10 mV/div
25 µs/div 10 mV/div
25 µs/div
CL = 0.47 µF (MLCC)
CL = 1.0 µF (MLCC)
CL = 3.3 µF (MLCC)
CL = 0.47 µF (MLCC)
CL = 1.0 µF (MLCC)
CL = 3.3 µF (MLCC)
CL = 0.47 µF (MLCC)
CL = 1.0 µF (MLCC)
CL = 3.3 µF (MLCC)
CL = 0.47 µF (MLCC)
CL = 1.0 µF (MLCC)
CL = 3.3 µF (MLCC)
January 22, 2002 TOKO, Inc. Page 17
TK740xxL
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
Load Transient
VIN = 4 V, CIN = 1.0 µF(MLCC)
A Side (IOUT) = 5 - 100 - 5 mA) B Side (IOUT) = 5 - 50 - 5 mA)
F
Cfb=472
CFB = 4700 pF CFB = 4700 pF
CFB = 4700 pFCFB = 4700 pF
CL = 1.0 µF(Tantalum)
CL = 1.0 µF(Tantalum)
VOUTA VOUTB
IOUT IOUT
5 to 100 to 5 mA STEP
CFB = 0
CFB = 4700 pF
5 to 50 to 5 mA STEP
CFB = 0
CFB = 4700 pF
VOUTA VOUTB
VOUTA
IOUT 5 to 100 to 5 mA STEP
VOUTA
VOUTA
CL = 0.47 µF(MLCC)
CL = 1.0 µF(MLCC)
CL = 3.3 µF(MLCC)
CL = 0.47 µF(MLCC)
CL = 1.0 µF(MLCC)
CL = 3.3 µF(MLCC)
VOUTB
IOUT
VOUTB
VOUTB
5 to 100 to 5 mA STEP
CL = 0.47 µF(MLCC)
CL = 1.0 µF(MLCC)
CL = 3.3 µF(MLCC)
VOUTB
IOUT
VOUTB
VOUTB
VOUTA
IOUT 5 to 100 to 5 mA STEP
VOUTA
VOUTA
CL = 0.47 µF(MLCC)
CL = 1.0 µF(MLCC)
CL = 3.3 µF(MLCC)
5 to 50 to 5 mA STEP
200 mV/div
25 µs/div
200 mV/div
250 µs/div
200 mV/div
250 µs/div
200 mV/div
50 µs/div 500 mV/div
50 µs/div
200 mV/div
25 µs/div
Page 18 January 22, 2002 TOKO, Inc.
TK740xxL
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
ON / OFF Transient
IOUT = 10 mA, CIN = 0.11 µF(MLCC), CL = 1.0 µF (MLCC)
The difference by CFB is negligible The difference by CFB is neligible
VCONT
VOUT
VCONT
VOUT
VCONT
VOUT
VCONT
VOUT
VCONT
VOUT
VCONT
VOUT
VOUT VOUT
VOUT
VOUT
VOUT
VOUT
CFB = 0
CFB = 100 pF 200 mV/div
50 µs/div
CFB = 0
CFB = 100 pF
CFB =4700 pF 200 mV/div
1 ms/div
CFB =3300 pF
CFB = 1000 pF
CFB =4700 pF 200 mV/div
1 ms/div
CFB =3300 pF
CFB = 1000 pF
2 V/div 2 V/div
2 V/div
2 V/div
2 V/div
200 mV/div
100 µs/div
2 V/div
200 mV/div
100 µs/div
A Side B Side
200 mV/div
25 µs/div
January 22, 2002 TOKO, Inc. Page 19
TK740xxL
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
Cross Regulation CIN = 0.1 mF CL = 1.0 mF(MLCC) CFB = None
The following graphs show the effect on both output voltages when rapidly changing the load current on only one side (A
side or B side in 5-50 , 5-100, 5-200 mA steps). The current on the side where the load current is not allowed to change
is 5 mA constant. The measurement sensitivity on the side without the current change is 5 mV/div: the side with the current
change is 200 mV/DIV.
A
B
A
B
A
B
A
B
A
B
TIME (250 µS)
VOUTA
VOUTB
A: = 5 mA(const) B: 5 to 50 mA Step A: = 5 mA(const) B: 5 to 100 mA Step
A: = 5 to 50 mA Step B: 5 mA(const) A: = 5 to 100 mA Step B: 5 mA(const)
A: = 5 to 200 mA Step B: 5 mA(const)
IOUTB
200 mV/div
250 µs/div
IOUT = 200 to 5 mA STEP
IOUT = 100 to 5 mA STEP
IOUT = 50 to 5 mA STEP
5 mV/div
250 µs/div
200 mV/div
250 µs/div
5 mV/div
250 µs/div
VOUTA
VOUTB
IOUTA
VOUTA
VOUTB
IOUTA
VOUTA
VOUTB
IOUTA
VOUTA
VOUTB
200 mV/div
250 µs/div
5 mV/div
250 µs/div
200 mV/div
250 µs/div
5 mV/div
250 µs/div
5 mV/div
250 µs/div
IOUT = 50 to 5 mA STEP IOUT = 100 to 5 mA STEP
IOUTB
200 mV/div
250 µs/div
Page 20 January 22, 2002 TOKO, Inc.
TK740xxL
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (VOUT)
The output voltage is specified with VIN = (VOUT(TYP) + 1 V)
and IOUT = 5 mA.
MAXIMUM OUTPUT CURRENT (IOUT(MAX))
The rated output current is specified under the condition
where the output voltage drops to VOUT(TYP) x 0.9. The input
voltage is set to VOUT(TYP) +1 V, and the current is pulsed to
minimize temperature effect. The output current decreases
during low voltage operation.
DROPOUT VOLTAGE (VDROP)
The dropout voltage is the difference between the input
voltage and the output voltage at which point the regulator
starts to fall out of regulation (this is the point when the
output voltage decreases by 100 mV). Below this value, the
output voltage will fall as the input voltage is reduced. It is
dependent upon the load current and the junction tempera-
ture.
LINE REGULATION (Line Reg)
Line regulation is the ability of the regulator to maintain a
constant output voltage as the input voltage changes. The
line regulation is specified as the input voltage is changed
from VIN = VOUT + 1 V to VIN = VOUT + 6 V. It is a pulsed
measurement to minimize temperature effects.
LOAD REGULATION (Load Reg)
Load regulation is the ability of the regulator to maintain a
constant output voltage as the load current changes. It is a
pulsed measurement to minimize temperature effects with
the input voltage set to VIN = VOUT +1 V. The load regulation
is specified under two output current step conditions of 5 mA
to 100 mA and 5 mA to 200 mA.
QUIESCENT CURRENT (IQ)
The quiescent current is the current which flows through the
ground terminal under no load conditions (IOUT = 0 mA).
GROUND PIN CURRENT(IGND)
The ground pin current is the current which flows through the
GND terminal according to load current. It is measured by
(input current-output current).
RIPPLE REJECTION RATIO (RR)
Ripple rejection is the ability of the regulator to attenuate the
ripple content of the input voltage at the output. It is
specified with 500 mVRMS, 100 Hz and 1 MHz signal
superimposed on the input voltage, where VIN = VOUT + 1.5
V. The output decoupling capacitor is set to 1.0 µF, the CFB
capacitor is set to 4700 pF, and the load current is set to 10
mA. Ripple rejection is the ratio of the ripple content of the
output vs. the input and is expressed in dB. Ripple rejection
can be improved by increasing the CFB capacitor (However,
the on/off response time will increase).
STANDBY CURRENT (ISTBY)
Standby current is the current into the regulator when the
output is turned off by the control function. It is measured
with an input voltage of 8 V.
OVER CURRENT SENSOR
The overcurrent sensor protects the device when there is
excessive output current. it also protects the device if the
output is accidentally shorted to ground.
THERMAL SENSOR
The thermal sensor protects the device if the junction
temperature exceeds the safe value (Tj = 150 °C). This
temperature rise can be caused by extreme heat, excessive
power dissipation caused by large output voltage drops, or
excessive output current. The regulator will shut off when
the temperature exceeds the safe value. As the junction
temperature decreases, the regulator will begin to operate
again. Under sustained fault conditions, the regulator output
will oscillate as the device turns off then resets. Damage
may occur to the device under extreme fault conditions.
REVERSE VOLTAGE PROTECTION
Reverse voltage protection prevents damage due to the
output voltage being higher than the input voltage. This fault
condition can occur when the output capacitor remains
charged and the input is reduced to zero, or when an external
voltage higher than the input voltage is applied to the output
side. Toko’s regulators do not need an inherent diode
connected between the input and output. The maximum
reverse bias boltage is 6 V.
TK740xx VOUT
VIN
GND
January 22, 2002 TOKO, Inc. Page 21
TK740xxL
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
PACKAGE POWER DISSIPATION (PD)
This is the power dissipation level at which the thermal
sensor is activated. The IC contains an internal thermal
sensor which monitors the junction temperature. When the
junction temperature exceeds the monitor threshold of
150 °C, the IC is shut down. The junction temperature rises
as the difference between the input power (VIN x IIN) and the
output power (VOUT x IOUT) increases. The rate of tempera-
ture rise is greatly affected by the mounting pad configura-
tion on the PCB, the board material, and the ambient
temperature. When the IC mounting has good thermal
conductivity, the junction temperature will be low even if the
power dissipation is large. When mounted on the recom-
mended mounting pad, the power dissipation of the
SOT23L-8 is increased to 600 mW. For operation at
ambient temperatures over 25 °C, the power dissipation of
the SOT23L-8 device should be derated at 4.8 mW/ °C. To
determine the power dissipation for shutdown when mounted,
attach the device on the actual PCB and deliberately
increase the output current (or raise the input voltage) until
the thermal protection circuit is activated. Calculate the
power dissipation of the device by subtracting the output
power from the input power. These measurements should
allow for the ambient temperature of the PCB. The value
obtained from PD /(150 °C - TA) is the derating factor. The
PCB mounting pad should provide maximum thermal con-
ductivity in order to maintain low device temperatures. As
a general rule, the lower the temperature, the better the
reliability of the device. The thermal resistance when
mounted is expressed as follows:
Tj = 0jA x PD + TA
For Toko ICs, the internal limit for junction temperature is
150 °C. If the ambient temperature (TA) is 25 °C, then:
150 °C = 0jA x PD + 25 °C
0jA = 125 °C / PD
0jA = 125 °C / PD (°C / mW)
PD is the value when the thermal protection circuit is
activated. A simple way to determine PD is to calculate VIN
x IIN when the output side is shorted. Input current gradually
falls as temperature rises. You should use the value when
thermal equilibrium is reached.
The range of usable currents can also be found from the
graph below.
Procedure:
1) Find PD
2) PD1 is taken to be PD x (~0.8 - 0.9)
3) Plot PD1 against 25 °C
4) Connect PD1 to the point corresponding to the 150 °C with
a straight line.
5) In design, take a vertical line from the maximum
operating temperature (e.g., 75 °C) to the derating curve.
6) Read off the value of PD against the point at which the
vertical line intersects the derating curve. This is taken as
the maximum power dissipation, DPD.
The maximum operating current is:
IOUT = (DPD / (VIN(MAX) - VOUT)
Pd
25 50 75 150
TA (°C)
3
PD(mW)
5
0100
2
4
Page 22 January 22, 2002 TOKO, Inc.
TK740xxL
APPLICATION INFORMATION
STANDARD APPLICATION
Typically, give the capacitor as large a value as practical in
consideration of the temperature characteristic. The output
noise and ripple noise decrease with a larger capacitance
value. In addition, the response to the output side load
change also improves.
OUTPUT VOLTAGE CHANGE
The output voltage on both sides can be set by using R1 and R2. The output voltage is deteremed by the ratio of R1 and
R2. The error of the output voltage usually grows because of the tolerance of the external parts.
NOISE REDUCTION (IMPROVEMENT OF RIPPLE REJECTION RATIO)
Please connect CFB with the FBA terminals (1 and 2) and FBB terminals (3 and 4). It is possible to use CFB only on the needed
side. A tantalum capacitor is the best in this application. A small capacitance is sufficient (0.1 µF, 0.22 µF, etc.). When
the ceramic capacitor is used, the noise grows in the low current region. If 1.0 Ω. (RS ≥ 1) is connected in series with the
ceramic capacitor, the same characteristics as a tantalum capacitor can be obtained. Please adjust the output side
capacitor to the value in which stable operation is done over all required temperature ranges. Damage will not be caused
by enlarging this value. Increasing this value will decrease the ripple noise and improve the output load transient response.
However, the risetime using the on/off control becomes slower. It is possible to use the noise reduction application with
output voltage change application above.
GND
VIN
CONT A
0.01 µF
CONT B
4
8
VOUTB
VOUTA
CL B
0.1 µF
(1.0 µF)
CL A
0.1 µF
(1.0 µF)
GND
VIN
CONT A
0.01 µF
CONT B
4
8
VOUTB
VOUTA
CFB = 4700 pF
CL B ≥ 1.0 µF
CFB CL ≥ * * µF:
Any capacitor can be used
CL A ≥ 1.0 µF
4700 pF is recommended for CFB
GND
VIN
CONT A
0.01 µF
CONT B
4
8
VOUTB
VOUTA
CL A
0.22 µF
(1.0 µF)
CL B
0.1 µF
(1.0 µF)
R2’
R1’
R2
R1 R1(KΩ) = (VOUT ÷ 1.19 - 1) x R2
VOUT = (R1 ÷ R2 + 1) x 1.19
22 k ≥ R2
IOUT = 50 to 200 mA
TK74028 NOISE LEVEL vs. CFB (A = B)
200
100
NOISE(µV)
01 10 100 1k 10k 100k
CFB(pF)
CL= 1.0 µF TANTALUM
CL= 1.0 µF MLCC
January 22, 2002 TOKO, Inc. Page 23
TK740xxL
APPLICATION INFORMATION (CONT.)
SOT23L-8 BOARD LAYOUT
BOARD LAYOUT
1
4
5
8
VOUTB
VOUTA
ON/OFF B
ON/OFF A GND
VIN
GND
600
025 50 (85) 150
-4.8 mW / °C
PD(mW)
0100
Mounted as shown
Free Air
TA(°C)
Page 24 January 22, 2002 TOKO, Inc.
TK740xxL
INPUT-OUTPUT CAPACITORS
Linear regulators require input and output capacitors in order to maintain the regulator’s loop stability. The equivalent series
resistance (ESR) of the output capacitor must be in the stable operation area. However, it is recommended to use as large
a value of capacitance as is practical. The output noise and the ripple noise decrease as the capacitance value increases.
The IC is never damaged by enlarging the capacitance.
ESR values vary widely between ceramic and tantalum capacitors. However, tantalum capacitors are assumed to provide
more ESR damping resistance, which provides greater circuit stability. This implies that a higher level of circuit stability
can be obtained by using tantalum capacitors when compared to ceramic capacitors with similar values. The IC provides
stable operation with an output side capacitor of 0.1 mF (VOUT ³ 1.8 V). If the capacitor is 0.1 mF or more over its full range
of temperature, either a ceramic capacitor or tantalum capacitor can be used without considering ESR (VOUT ³ 1.8 V).
APPLICATION INFORMATION (CONT.)
The recommended value of CL ³ 0.1 mF for IOUT ³ 0.5 mA.
For load current £ 0.5 mA, increase the output capacitor to 1 mF.
The input capacitor is necessary when the battery is discharged,
the power supply impedance increases, or the line distance to the
power supply is long. This capacitor might be necessary on each
individual IC even if two or more regulator ICs are used. It is not
possible to determine this indiscriminately. Please confirm the
stability while mounted.
Please increase the output capacitor value when the load current is 0.5 mA or less. The stability of the regulator improves
if a big output side capacitor is used (the stable operation area extends).
For evaluation KYOCERA CM05B104K10AB, CM05B224K10AB, CM105B104K16A, CM105B224K16A, CM21B225K10A
MURATA GRM36B104K10, GRM42B104K10, GRM39B104K25, GRM39B224K10, GRM39B105K6.3
100
10
1
0.1
0 .01
ESR (Ω)
100
10
1
0.1
0 .01
ESR (Ω)
100
10
1
0.1
0 .01
ESR (Ω)
100
10
1
0.1
0 .01
ESR (Ω)
100
10
1
0.1
0 .01
ESR (Ω)
0 50 100 150
IOUT (mA)
All Stable
CL ≥ 1.0 µF
0 50 100 150
IOUT (mA)
0 50 100 150
IOUT (mA)
0 50 100 150
IOUT (mA)IOUT (mA)
0 50 100 150
STABLE AREA
CL = 0.1 µF STABLE AREA
CL = 0.1 µF STABLE AREA
CL = 0.1 µF
STABLE AREA
CL = 0.1 µF STABLE AREA
CL = 0.1 µF
VOUT = 1.5 V - 1.9 V VOUT = 2.0 V VOUT = 3.0 V VOUT = 4.0 V VOUT = 5.0 V
All Stable All Stable All Stable All Stable
CL = 0.22 µF
~ 0.1 µF
VOUT
CIN = 0.22 µF
~ 0.1 µF
TK740xx
VIN
January 22, 2002 TOKO, Inc. Page 25
TK740xxL
Bias Voltage and Temperature Characteristics of Ceramic Capacitors
Generally, a ceramic capacitor has both a temperature characteristic and a voltage characteristic. Please consider
both characteristics when selecting the part. The B curves are the recommended characteristics.
APPLICATION INFORMATION (CONT.)
Bias Voltage (V)
0 2 4 6 8 1 0
100
90
80
70
CAPACITANCE vs. BIAS VOLTAGE
60
50
40
F CURVE
B CURVE
CAPACITANCE (%)
TA (°C)
-50 - 25 0 2 5 5 0 7 5 1 0 0
100
90
80
70
CAP ACITA NCE vs. TE MP ER ATURE
60
50
F CURVE
B CURVE
CAPACITANCE (%)
Page 26 January 22, 2002 TOKO, Inc.
TK740xxL
APPLICATION INFORMATION (CONT.)
Super-Low I/O Voltage Difference and High Current LDO
Connect the following terminals; pin 5 and pin 8, pin 1 and pin 4, pin 2 and pin 3. VDROP = 70 mV at 100 mA; 125 mV at 200 mA;
180 mV at 300 mA is typically obtained.
Attention when this application is adopted
The control current and the no load current double because the A and B circuits are connected in parallel. A very large current
flows at the output during a short-circuit. Therefore, there is a possibility of damage by the current. Please note the short-
circuit of the output side and GND. The current value that can regularly be delivered is 300-400 mA. The output current is
limited by the permissible electric power loss of the package. The current cannot be delivered exceeding this. However,
a large peak current can be delivered for the pulse load with little generation of heat. The permissible loss increases by
improving heat radiation. Please make the copper pattern in the IC part installation as wide as possible.
For instance, the permissible electric power loss increases greatly if the board thermal plan is bonded to the IC. The
characteristic of this application is not guaranteed immediately because Toko does not test to this application. The
characteristic of this application is almost obtained by guaranteeing the characteristic on the A side and the B side. The
difference appears large; use care when designing.
VOUT
8
GND
VIN
VCONT
CL 1
0.22 µF
FBA
FBB
6
-100
DROPOUT VOLTAGE A + B
-50
0
-150
-200
-250 0 100 200
VDROP(mV)
IOUT(mA)
A
B
A+B
6
8
10
4
2
00 100 200
IOUT(mA)
IGND vs. IOUT A + B
IGND(mA)
LOAD REGULATION
0 100 200 300 400
IOUT(mA)
VOUT
(10 mV/DIV
3
SHORT CIRCUIT CURRENT
4
5
2
1
00 500 1000
IOUT(mA)
VOUT(TYP)
VOUT(V)
January 22, 2002 TOKO, Inc. Page 27
TK740xxL
Improvement of load regulation with high current application
Please connect a resistor (Max = 1.2 - 1.6 W) between pin 6 of the TK740xx and GND.
The load regulation is greatly improved. Please increase the I/O capacitors.
APPLICATION INFORMATION (CONT.)
VOUT
8
GND
VIN
VCONT
CL 1
0.22 µF
FBA
FBB
6
RG
IOUT(mA)
0 100 200 300 400
LOAD RE GULATION
VOUT(TYP)
VOUT
(10mV/div)
RG = 1.60
VOUT
Page 28 January 22, 2002 TOKO, Inc.
TK740xxL
APPLICATION INFORMATION (CONT.)
Variable output voltage. Output voltage controled by an external voltage (power supply, DAC, tec.).
When VADJ is raised more than 1.25V, the correspoinding output voltage falls. Because the two sides operate independently,
one side only can be used, if desired.
Forward or reverse: Motor drive circuit.
The direction of the direct current motor rotation changes with the direction of the current. A bridge circuit can be made with
the TK740xx and an external transistor. Each element of the bridge circuit is controlled by an external signal. On/off control
of the bridge elements is accomplished and the desired voltage polarity for the motor is selected. The speed changes in
accordance with the amount of current (voltage) which flows through the motor. The TK740xx has both the switch function
and the variable output voltage function. The motor rotation speed can be controlled by changing the output voltage. The
speed and direction of the motor can be controlled by combining the two functions above. The I/O voltage difference of
TK740xx is approximately 0.17 V at IOUT = 150 mA. The current when the motor starts is 300 mA Max.
Constant speed (fixed voltage)
Even if the input voltage changes, the voltage
impressed to the motor is constant.
Variable speed (variable voltage)
When VADJ is raised more than 1.25 V, the output
voltage falls.
VADJ
VOUTB
8
GND
VIN
6
R = 100 KΩ
VOUTA
CONT B
CONT A
TK740xx
VOUTB
8
TK740xx
GND
VIN
CL = 0.1 µF
VOUTA
CONT (F)
M
CONT
(R)
VOUTB
8
TK740xx
GND
VIN
CFB = 0.0047 µF
VOUTA
CONT (F)
M
VADJ
CONT
(R)
January 22, 2002 TOKO, Inc. Page 29
TK740xxL
Marking Information
Product Code A
Part Number Voltage Code
TK74013 13
TK74014 14
TK74015 15
TK74016 16
TK74017 17
TK74018 18
TK74019 19
TK74020 20
TK74021 21
TK74022 22
TK74023 23
TK74024 24
TK74025 25
TK74026 26
TK74027 27
TK74028 28
TK74029 29
TK74030 30
TK74031 31
TK74032 32
TK74033 33
TK74034 34
TK74035 35
TK74036 36
TK74037 37
TK74038 38
TK74039 39
TK74040 40
TK74041 41
TK74042 42
TK74043 43
TK74044 44
TK74045 45
TK74046 46
TK74047 47
TK74048 48
TK74049 49
TK74050 50
SOT23L-8
PACKAGE OUTLINE
Printed in the USA
© 1999 Toko, Inc.
All Rights Reserved
TOKO AMERICA REGIONAL OFFICES
Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864
IC-264-TK740xx
0798O0.0K
Visit our Internet site at http://www.tokoam.com
The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products
without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may
result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc. TOKO’s products are not authorized for use as critical components in life support
devices or systems without the express written approval of the president of Toko, Incorporated.
Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: (847) 297-0070
Fax: (847) 699-7864
Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: (719) 528-2200
Fax: (719) 528-2375
5
14
8
0.8
0.8
3.3
0.4
2.2
(0.3)
1.2
0.15
0.3
1.0
3.0
e1
Recommended Mount Pad
0-0.1
15max
e
0.1
M
0.1
0.45
1.4max
(3.4)
3.5
Marking
Product Code
Voltage
Code
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwisespecified)
+0.3
-0.1
+0.15
-0.05
+0.3
+0.15
-0.05
e
XX A
