[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 1 - 2011/02
TK705xxS/TK706xxH
LDO Regulator IC
1-
. DESCRIPTION
TK705xxS and TK706xxH is a low dropout linear
regulator with ON/OFF control, which can supply 100mA
load current.
The IC is an integrated circuit with a silicon monolithic
bipolar structure.
The output voltage, trimmed with high accuracy, is
available from 1.5 to 5.0V in 0.1V steps.
The packages are the small and thin SON2017-6, and
the extremely versatile SOT23-5. The IC is designed for
portable applications with space requirements, battery
powered system and any electronic equipment.
Two kinds of pin configuration can be selected for each
package.
The over current, over heat sensor and reverse bias over
current protection circuits are built-in.
ESD is also high, so it won’t break easily. It is possible
to use at ease.
2-
. FEATURES
Output current: 100mA, Peak 200mA
Active high on/off control
Excellent Ripple rejection ratio: 80dB (f=1kHz)
70dB (f=10kHz)
Output capacitance: Cout 0.47F(Ceramic)
Output voltage accuracy: 1.5% or 50mV
Short circuit protection (Over current protection)
Internal thermal shutdown (Over heat protection)
Reverse bias protection
3-
. APPLICATIONS
Any Electronic Equipment
Battery Powered Systems
Mobile Communication
4-
. PIN CONFIGURATION
Top View
· SOT23-5 TK705xxS
Vin
VoutNp
GND
Vcont
43
2
51
· SON2017-6 TK706xxH
*2pin,5pin are connected in the IC.
Vin
VoutNp
GND
Vcont
GND
43
52
61
A x x
A x x
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 2 - 2011/02
5-
. PACKAGE OUTLINE
SOT23-5 SON2017-6
2.9
1.6
1.1
0.15
0.4
2.8
2.4
Reference Mount Pad
1.0
0.7
(0.3)
0 ~0.1 ±0.1
1.3max
0.1
±0.2
Mark
±0.2
±0.2
54
13
+0.10
0.05
+0.10
0.05
0.95 0.95
0.95 0.95
M
0.1
1.7
0.20+0.10
0.05
0.65 M
0.10
+0.2
0.1
2.0 +0.2
0.1
1
4
3
6
(0.1)
0.75
(0.2)
0.10
0.125+0.10
0.05
2.1 0.2
(0.2)
1
4
3
6
Reference Mount Pad
1.8
0.6
0.3
0.65
Mark
1 Pin Mark Lot No.
Lead Free Mark
6-
. BLOCK DIAGRAM
Bandgap
Reference
Over Heat &
Over Current
Protection
Vin
Vcont
Vout
NpGND
500kΩ
Control
Circuit
320kΩ
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 3 - 2011/02
7-
. ABSOLUTE MAXIMUM RATINGS
Ta=25C
Symbol
Rating
Units
Conditions
Absolute Maximum Ratings
VccMAX
-0.4 ~ 16
V
VrevMAX
-0.4 ~ 6
V
Vout 2.0V
-0.4 ~ 12
V
2.1V Vout
VnpMAX
-0.4 ~ 5
V
VcontMAX
-0.4 ~ 16
V
Tstg
-55 ~ 150
C
PD
460 *1
mW
SOT23-5
400 *2
mW
SON2017-6
Operating Condition
TOP
-40 ~ 85
C
VOP
2.1 ~ 14
V
Ishort
200
mA
Over Current Protection
*1 : Internal Limited Tj=140°C. PD must be decreased at rate of 4.0 mW/C for operation above 25C.
*2 : Internal Limited Tj=140°C. PD must be decreased at rate of 3.5 mW/C for operation above 25C.
The maximum ratings are the absolute limitation values with the possibility of the IC breakage.
When the operation exceeds this standard, quality cannot be guaranteed.
8-
. ELECTRICAL CHARACTERISTICS
The parameters with min. or max. values will be guaranteed at Ta=Tj=25C with test when manufacturing or
SQC(Statistical Quality Control) methods. The operation between -40 ~ 85C is guaranteed when design.
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 4 - 2011/02
Vin=VoutTYP+1V,Vcont=1.8V,Ta=Tj=25C
Parameter
Symbol
Value
Units
Conditions
MIN
TYP
MAX
Output Voltage
Vout
Refer to TABLE 1
V
Iout = 5mA
Line Regulation
LinReg
0.0
5.0
mV
Vin = 5V
Load Regulation
LoaReg
Refer to TABLE 1
mV
Iout = 5mA ~ 50mA
Refer to TABLE 1
mV
Iout = 5mA ~ 100mA
Dropout Voltage *1
Vdrop
90
160
mV
Iout = 50mA
160
280
mV
Iout = 100mA
Output Current *2
Iout
100
mA
Peak Output Current *2
IoutPEAK
150
200
mA
When (VoutTYP0.9)
Quiescent Current
Iq
75
120
A
Iout = 0mA
Standby Current
Istandby
0.0
0.1
A
Vcont = 0V
Ground Pin Current
Ignd
1.5
2.7
mA
Iout = 50mA
Control Terminal *3
Control Current
Icont
5.0
15.0
A
Vcont = 1.8V
Control Voltage
Vcont
1.8
V
Vout ON state
0.35
V
Vout OFF state
Reference Value
Np Terminal Voltage
Vnp
1.26
V
Output Voltage / Temp.
Vout/Ta
35
ppm
/C
Output Noise Voltage
(VoutTYP=3.0V)
Vnoise
38
Vrms
Cout=1.0F, Cnp=0.01F
Iout=30mA
Ripple Rejection
(VoutTYP=3.0V)
R.R
80
dB
Cout=1.0F, Cnp=0.001F
Iout=10mA, f=1kHz
70
dB
f=10kHz
Rise Time
(VoutTYP=3.0V)
tr
35
s
Cout=1.0F, Cnp=0.001F
Vcont: Pulse Wave (100Hz)
Vcont ON Vout95% point
*1: For Vout 2.0V , no regulations.
*2: The output current is limited by power dissipation.
*3: The input current decreases to pA level when control terminal is connected to GND (Off state).
General Note: Parameter with only typical value is for reference only.
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 5 - 2011/02
TABLE 1. Output Voltage, Load Regulation
Part Number
Output Voltage
Load Regulation
Iout = 50mA
Iout = 100mA
MIN
TYP
MAX
TYP
MAX
TYP
MAX
V
V
V
mV
mV
mV
mV
VoutTYP=1.3V ~ 2.0V
TK70513SC
TK70613HC
1.250
1.300
1.350
5.0
10.0
10.0
22.0
TK70514SC
TK70614HC
1.350
1.400
1.450
5.0
10.0
10.0
23.0
TK70515SC
TK70615HC
1.450
1.500
1.550
5.0
11.0
10.0
24.0
TK70516SC
TK70616HC
1.550
1.600
1.650
5.0
11.0
11.0
25.0
TK70517SC
TK70617HC
1.650
1.700
1.750
5.0
11.0
11.0
25.0
TK70518SC
TK70618HC
1.750
1.800
1.850
5.0
12.0
11.0
26.0
TK70519SC
TK70619HC
1.850
1.900
1.950
5.0
12.0
11.0
27.0
TK70520SC
TK70620HC
1.950
2.000
2.050
5.0
12.0
12.0
28.0
VoutTYP=2.1V ~ 3.0V
TK70521SC
TK70621HC
2.050
2.100
2.150
5.0
12.0
12.0
28.0
TK70522SC
TK70622HC
2.150
2.200
2.250
6.0
13.0
12.0
29.0
TK70523SC
TK70623HC
2.250
2.300
2.350
6.0
13.0
13.0
30.0
TK70524SC
TK70624HC
2.350
2.400
2.450
6.0
13.0
13.0
31.0
TK70525SC
TK70625HC
2.450
2.500
2.550
6.0
14.0
13.0
31.0
TK70526SC
TK70626HC
2.550
2.600
2.650
6.0
14.0
14.0
32.0
TK70527SC
TK70627HC
2.650
2.700
2.750
6.0
14.0
14.0
33.0
TK70528SC
TK70628HC
2.750
2.800
2.850
6.0
14.0
14.0
34.0
TK70529SC
TK70629HC
2.850
2.900
2.950
6.0
15.0
15.0
34.0
TK70530SC
TK70630HC
2.950
3.000
3.050
6.0
15.0
15.0
35.0
VoutTYP=3.1V ~ 4.0V
TK70531SC
TK70631HC
3.050
3.100
3.150
7.0
15.0
15.0
36.0
TK70532SC
TK70632HC
3.150
3.200
3.250
7.0
15.0
16.0
37.0
TK70533SC
TK70633HC
3.250
3.300
3.350
7.0
16.0
16.0
37.0
TK70534SC
TK70634HC
3.349
3.400
3.451
7.0
16.0
16.0
38.0
TK70535SC
TK70635HC
3.447
3.500
3.553
7.0
16.0
16.0
39.0
TK70536SC
TK70636HC
3.546
3.600
3.654
7.0
17.0
17.0
40.0
TK70537SC
TK70637HC
3.644
3.700
3.756
7.0
17.0
17.0
40.0
TK70538SC
TK70638HC
3.743
3.800
3.857
7.0
17.0
17.0
41.0
TK70539SC
TK70639HC
3.841
3.900
3.959
8.0
17.0
18.0
42.0
TK70540SC
TK70640HC
3.940
4.000
4.060
8.0
18.0
18.0
43.0
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 6 - 2011/02
TABLE 1. Output Voltage, Load Regulation (continue)
Part Number
Output Voltage
Load Regulation
Iout = 50mA
Iout = 100mA
MIN
TYP
MAX
TYP
MAX
TYP
MAX
V
V
V
mV
mV
mV
mV
VoutTYP=4.1V ~ 5.0V
TK70541SC
TK70641HC
4.038
4.100
4.162
8.0
18.0
18.0
43.0
TK70542SC
TK70642HC
4.137
4.200
4.263
8.0
18.0
19.0
44.0
TK70543SC
TK70643HC
4.235
4.300
4.365
8.0
18.0
19.0
45.0
TK70544SC
TK70644HC
4.334
4.400
4.466
8.0
19.0
19.0
46.0
TK70545SC
TK70645HC
4.432
4.500
4.568
8.0
19.0
20.0
46.0
TK70546SC
TK70646HC
4.531
4.600
4.669
8.0
19.0
20.0
47.0
TK70547SC
TK70647HC
4.629
4.700
4.771
8.0
20.0
20.0
48.0
TK70548SC
TK70648HC
4.728
4.800
4.872
9.0
20.0
21.0
49.0
TK70549SC
TK70649HC
4.826
4.900
4.974
9.0
20.0
21.0
49.0
TK70550SC
TK70650HC
4.925
5.000
5.075
9.0
20.0
21.0
50.0
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 7 - 2011/02
9-
. TEST CIRCUIT
9-1-
. TK705xxS/TK706xxH
Vin
Icont
Vcont
Iin
Cin Iout Vout
1.0F 1.0F
0.001F
A
V
A
Cout
Cnp
Vin Vout
Np
GND
Vcont GND
TK705xxS (SOT23-5)
Vin Vout
NpVcont GND
4
32
5
1
TK706xxH (SON2017-6)
Vin Vout
Np
GND
Vcont GND
4
3
5
2
6
1
*2pin and 5pin are connected in
the IC.
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 8 - 2011/02
10-
. TYPICAL CHARACTERISTICS
10-1-
-1. DC CHARACTERISTICS
Line Regulation
Test conditions
Cnp
0.001F
Cout
1.0F
Iout=5mA
Cin
1.0F
Vcont
1.8V
Vin
=VoutTYP+1V Vin Vout
Vcont Np
Iin vs Vin
Iout=0mA
Quiescent Current
Iout=0mA
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
0 2 4 6 8 10 12 14 16
Vin (V)
Iin (mA)
Vout=
1.5,2.0,3.0,4.0,5.0V
Load Regulation
Peak Output Current
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
050 100 150 200 250 300
Iout (mA)
Vout (V)
5.0V
4.0V
3.0V
2.0V
1.5V
Vout=
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 9 - 2011/02
GND Pin Current
Test conditions
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
050 100
Iout (mA)
Ignd (mA)
Cnp
0.001F
Cout
1.0F
Iout=5mA
Cin
1.0F
Vcont
1.8V
Vin
=VoutTYP+1V Vin Vout
Vcont Np
Dropout Voltage
2.1V VoutTYP
Standby Current (Off state)
Vcont=0V
-160
-140
-120
-100
-80
-60
-40
-20
0
050 100
Iout (mA)
Vdrop (mV)
1.E-11
1.E-10
1.E-09
1.E-08
1.E-07
1.E-06
0 2 4 6 8 10 12 14 16
Vin (V)
Istanby (A)
Control Current
Control Current, ON/OFF Point
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 10 - 2011/02
Vout vs Vin Regulation Point
2.1V VoutTYP
Test conditions
Cnp
0.001F
Cout
1.0F
Iout=5mA
Cin
1.0F
Vcont
1.8V
Vin
=VoutTYP+1V Vin Vout
Vcont Np
Vout vs Vin Regulation Point
VoutTYP=1.5V
Vout vs Vin Regulation Point
VoutTYP=2.0V
1.34
1.36
1.38
1.40
1.42
1.44
1.46
1.48
1.50
1.52
1.54
1.5 1.6 1.7 1.8 1.9 2.0
Vin (V)
Vout (V)
Iout=0,50,100mA
1.84
1.86
1.88
1.90
1.92
1.94
1.96
1.98
2.00
2.02
2.04
1.8 1.9 2.0 2.1 2.2 2.3
Vin (V)
Vout (V)
Iout=0,50,100mA
Reverse Bias Current
Vin=0V, Vcont=0V
Test conditions
Cnp
0.001F
Cout
1.0F
Vin=0V
Cin
1.0F
Vcont
0V
Vrev
Vin Vout
Vcont Np
Irev
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 11 - 2011/02
11-1-2. Temperature Characteristics
Vout
VoutTYP=3.0V
Test conditions
-40
-30
-20
-10
0
10
20
-40 -20 0 20 40 60 80 100
Ta （℃）
ΔVout (mV)
35.15 ppm/℃
Cnp
0.001F
Cout
1.0F
Iout=5mA
Cin
1.0F
Vcont
1.8V
Vin
=VoutTYP+1V Vin Vout
Vcont Np
Peak Output Current
Vout=VoutTYP 0.9
GND Pin Current
0
50
100
150
200
250
-40 -20 0 20 40 60 80 100
Ta(℃)
IoutPEAK(mA)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
-40 -20 0 20 40 60 80 100
Ta(°C)
Ignd(mA)
Iout=100mA
Iout=50mA
Iout=30mA
Dropout Voltage
2.1V VoutTYP
Quiescent Current
Iout=0mA
0
50
100
150
200
250
300
-40 -20 0 20 40 60 80 100
Ta(°C)
Vdrop(mV)
Iout=100mA
Iout=50mA
Iout=30mA
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 12 - 2011/02
Test conditions
Cnp
0.001F
Cout
1.0F
Iout=5mA
Cin
1.0F
Vcont
1.8V
Vin
=VoutTYP+1V Vin Vout
Vcont Np
Load Regulation
VoutTYP=3.0V
Line Regulation
Vin = 5V
-60
-50
-40
-30
-20
-10
0
-40 -20 0 20 40 60 80 100
Ta(℃)
LoaReg(mV)
Iout=30mA
Iout=50mA
Iout=100mA
-20
-15
-10
-5
0
5
10
15
20
-40 -20 0 20 40 60 80 100
Ta(℃)
LinReg(mV)
Control Current
ON/OFF Point
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
-40 -20 0 20 40 60 80 100
Ta（℃）
Vcont(V)
Vout_ON
Vout_OFF
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 13 - 2011/02
10-2-
. AC CHARACTERISTICS (VoutTYP=3.0V)
Ripple Rejection
Cout=0.22F, 0.47F, 1.0F, 2.2F
Test conditions
Cnp
0.001F
Cout
Iout=10mA
Vcont
1.8V
Vin(DC)=VoutTYP+1.5V
f=100Hz 1MHz
200mVp-p
Vripple
Vin Vout
Vcont Np 1.0F
Cnp=0.00F, 0.01F, 0.1F
Iout=10mA, 20mA, 50mA, 100mA
R.R vs Iout : Frequency=1kHz
R.R vs Low Vin : Frequency=1kHz
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0 20 40 60 80 100
Iout (mA)
Ripple Rejection (dB)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0 0.2 0.4 0.6 0.8 1
Vin-Vout(Typ) (V)
Ripple Rejection (dB)
Iout=100mA
Iout=50mA
Iout=20mA
Iout=10mA
Iout=1mA
The ripple rejection (R.R) characteristic depends on the characteristic and the capacitance of the capacitor connected at
the output side. Also it depends on the output voltage. The R.R characteristic at 50kHz or more varies greatly with the
capacitor on the output side and PCB pattern. If necessary, please check stability during operation.
Cout=0.22F
0.47F
1.0F
2.2F
Cnp=0.001F
Cnp=0.01F
0.1F
Iout=100mA
50mA
20mA
10mA
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 14 - 2011/02
ON/OFF Transient
Test conditions
Rise Time
Vout×95%
Vcont
Vout
Time
Voltage
Cnp
Cout
1.0F
Iout=30mA
Cin
1.0F
Vin
=VoutTYP+1V
Vcont=0V2V
(f=100Hz)
Vin Vout
Vcont Np
0.001F
Cout=0.47F, 1.0F, 2.2F
Cout=0.47F, 1.0F, 2.2F
Cnp=0.001F, 0.01F, 0.1F
The rise time of the regulator depends on Cout and Cnp.
The fall time depends on Cout.
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 15 - 2011/02
LOAD Transient
Test conditions
Cnp
CoutCin
1.0F
Vcont
1.8V
Vin
=VoutTYP+1V Iout
ONOFF
0.001F
1.0F
Vin Vout
Vcont Np
Iout=0100mA, 5105mA
Iout=100mA0mA, 105mA5mA
Cout=0.47F, 1.0F, 2.2F : Iout=0mA100mA
Cout=0.47F, 1.0F, 2.2F : Iout=100mA0mA
Increase the load side capacitor when the load change is fast or when there is a large current change. In addition, at no
load, supplying small load current to ground can reduce the voltage change.
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 16 - 2011/02
LINE Transient
Cnp=0.001F, 0.01F, 0.1F
Test conditions
Cnp
Cout
1.0F
Iout=30mA
Vcont
1.8V
Vin
=VoutTYP+1V+2V
0.001F
Vin Vout
Vcont Np
Cout=0.1F, 0.22F, 0.47F
Cout=1.0F, 2.2F
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 17 - 2011/02
Output Noise Characteristics
Vout vs Noise
Test conditions
0
10
20
30
40
50
60
70
80
1.0 2.0 3.0 4.0 5.0
Vout(Typ) (V)
Noise (uVrms)
Cnp
0.01F
Cout
1.0F
Iout=30mA
Cin
1.0F
Vcont
1.8V
Vin
=VoutTYP+1V
BPF=400Hz 80kHz
Vin Vout
Vcont Np
Cnp vs Noise
Iout vs Noise
0
50
100
150
200
250
300
1p 10p 100p 1000p 0.01u 0.1u
Cnp (F)
Noise (uVrms)
Cout=0.22uF
Cout=0.47uF
Cout=1.0uF
Cout=2.2uF
20
25
30
35
40
45
50
55
60
65
70
0 20 40 60 80 100
Iout (mA)
Noise (uVrms)
Cout=0.22uF
Cout=0.47uF
Cout=1.0uF
Cout=2.2uF
Increase Cnp to decrease the noise. The recommended Cnp capacitance is 0.01F 0.1F.
The amount of noise increases with the higher output voltages.
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 18 - 2011/02
11-
. PIN DESCRIPTION
Pin No.
Pin
Description
Internal Equivalent Circuit
Description
TK705xxS : 1
TK706xxH : 1
Vcont
Vcont
320k
500k
On/Off Control Terminal
VCONT > 1.8V : ON
VCONT < 0.35V : OFF
The pull-down resister (500k) is built-in.
TK705xxS : 2
TK706xxH : 2,5
GND
GND Terminal
TK705xxS : 3
TK706xxH : 3
Np
Np
Noise Bypass Terminal
Connect a bypass capacitor between GND.
TK705xxS : 4
TK706xxH : 4
Vout
Vout
Vin
Vref
Output Terminal
TK705xxS : 5
TK706xxH : 6
Vin
Input Terminal
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 19 - 2011/02
12-
. APPLICATIONS INFORMATION
12-1-
. Definition of Technical Terms
Relating Characteristic
Note Each characteristics will be measured in a short
period not to be influenced by joint temperature (Tj).
Output voltage (Vout)
The output voltage is specified with Vin= VoutTYP+1V
and Iout=5mA
Output current (Iout)
Output current, which can be used continuously (It is the
range where overheating protection of the IC does not
operate.)
Peak maximum output current (IoutPEAK)
The rated output current is specified under the condition
where the output voltage drops 90% by increasing the
output current, compared to the value specified at
Vin=VoutTYP+1V.
Dropout voltage (Vdrop)
It is an I/O voltage difference when the circuit stops the
stable operation by decreasing the input voltage.
It is measured when the output voltage drops 100mV
from its nominal value by decreasing the input voltage
gradually.
Line Regulation (LinReg)
It is the fluctuations of the output voltage value when
the input voltage is changed.
Load Regulation (LoaReg)
It is the fluctuations of the output voltage value when
the input voltage is assumed to be VoutTYP +1V, and the
load current is changed.
Ripple Rejection (R.R)
Ripple rejection is the ability of the regulator to
attenuate the ripple content of the input voltage at the
output. It is measured with the condition of
Vin=Vout+1.5V. Ripple rejection is the ratio of the ripple
content between the output vs. input and is expressed in
dB.
Standby current (Istandby)
It is an input current, which flows to the control terminal,
when the IC is turned off.
Relating Protection Circuit
Over Current Protection
It is a function to protect the IC by limiting the output
current when excessive current flows to IC, such as the
output is connected to GND, etc.
Thermal Protection
It protects the IC not to exceed the permissible power
consumption of the package in case of large power loss
inside the regulator.
The output is turned off when the chip reaches around
140C, but it turns on again when the temperature of the
chip decreases.
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
Generally, a LDO regulator has a diode in the input
direction from an output. If an input falls from an output
in an input-GND short circuit etc. and this diode turns on,
current will flow for an input terminal from an output
terminal. In the case of excessive current, IC may break.
In order to prevent this, it is necessary to connect an
Schottky Diode etc. outside.
This product is equipped with reverse bias over-current
prevention, and excessive current does not flow in to IC.
Therefore, no need to connect diode outside.
Vin Vout
ESD
It is tested by connecting charged capacitor to GND pin
and Vin pin.
MM 200pF 0 200Vmin
HBM 100pF 1.5k 2000Vmin
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 20 - 2011/02
12-2-
. ESR Stability
Linear regulators require input and output capacitors in
order to maintain the regulator's loop stability. If
0.22F or larger capacitor is connected to the output side,
the IC provides stable operation at any voltage
(1.3VVoutTYP5.0V). (The capacitor must be larger then
0.22F at all temperature and voltage range) If the
capacitor with high Equivalent Series Resistance (ESR)
(several ohms) is used, such as tantalum capacitor etc.,
the regulator may oscillate. Please select parts with low
ESR.
Due to the parts are uneven, please enlarge the
capacitance as much as possible. With larger capacity, the
output noise decreases more. In addition, the response to
the load change, etc. can be improved. The IC won’t be
damaged by enlarging the capacity.
A recommended value of the application is as follows.
Cin=Cout0.47F Ceramic Capacitance
Fig.13-1
TK705xxS
TK707xxS
TK706xxH
TK708xxH
Cin0.47F
Vin Vout
Cout0.47F
Cnp
0.001F
GND
Fig.13-2
Output Voltage, Output Current vs.Stable Operation Area
Cout=0.1F Cout=0.22F
0.01
0.1
1
10
100
020 40 60 80 100
Iout (mA)
ESR (Ω)
Stable area
Unstable area
Unstable area
1.5V VoutTYP 5.0V
Fig.13-2 shows stable operation with a ceramic
capacitor of 0.22F. Since it may oscillate if ESR is large,
we recommend using ceramic capacitor.
The stability of the regulator improves with larger
output capacitor (the stable operation area extends.)
Please use the capacitor with larger capacitance as
possible.
For evaluation
Kyocera: CM05B104K10AB, CM05B224K10AB,
CM105B104K16A, CM105B224K16A,
CM21B225K10A
Murata: GRM36B104K10, GRM42B104K10,
GRM39B104K25, GRM39B224K10,
GRM39B105K6.3
The input capacitor is necessary in case the battery
voltage drops, the power supply impedance increases, or
the distance to the power supply is far. 1 input capacitor
might be necessary for each IC or for several ICs. It
depends on circuit condition. Please confirm the stability
by each circuit.
Fig.13-3
ex. Ceramic Capacitance vs. Voltage, Temperature
Generally, a ceramic capacitor has both temperature
characteristic and voltage characteristic. Please consider
both characteristics when selecting the part. The B curves
are the recommend characteristics.
TK705xxS
TK706xxH
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 21 - 2011/02
12-3-
. Operating Region and Power Dissipation
The power dissipation of the device depends on the
junction temperature. Therefore, the package dissipation
is assumed to be an internal limitation. The package itself
does not have enough heat radiation characteristic due to
the small size. Heat runs away by mounting IC on PCB.
This value changes by the material, copper pattern etc. of
PCB.
The overheating protection operates when there is a lot
of loss inside the regulator (Ambient temperature high,
heat radiation bad, etc.). The output current and the
output voltage will drop when the protection circuit
operates. When joint temperature (Tj) reaches the set
temperature, IC stops the operation. However, operation
begins at once when joint temperature (Tj) decreases.
The thermal resistance when mounted on PCB
The chip joint temperature during operation is shown by
Tj=ja×Pd+Ta. Joint part temperature (Tj) of TK705xxS
/TK706xxH is limited around 140C with the overheating
protection circuit. Pd is the value when the overheating
protection circuit starts operation.
When you assume the ambient temperature to be 25C,
140= ja Pd(W)+25
ja Pd=115
ja=115/Pd (C /W)
Example of mounting substrate
PCB Material: Two layer glass epoxy substrate
(x=30mm,y=30mm,t=1.0mm,Copper pattern thickness
35um)
TK705xxS (SOT23-5)
Please do the derating with 5.9mW/C at Pd=677mW and
25C or higher. Thermal resistance ( ja) is 170C/W.
TK706xxH (SON2017-6)
Please do the derating with 4.9mW/C at Pd=560mW and
25C or higher. Thermal resistance ( ja) is 205C/W.
Method of obtaining Pd easily
Connect output terminal to GND(short circuited), and
measure the input current by increasing the input voltage
gradually up to 10V. The input current will reach the
maximum output current, but will decrease soon
according to the chip temperature rising, and will finally
enter the state of thermal equilibrium (natural air cooling).
The input current and the input voltage of this state will
be used to calculate the Pd.
Pd(mW) Vin (V) Iin (mA)
When the device is mounted, mostly achieve
TK705xxS (SOT23-5): 580mW or more
TK706xxH (SON2017-6): 500mW or more
* In case that the power, Vin Ishort(Short Circuit Current),
becomes more than the maximum rating of its power dissipation,
the IC may damaged before internal thermal protection works.
25 50 100
Pd(mW)
140C
Pd
0075C
Ta(°C)
2
3
4
D Pd 5
Procedure (When mounted on PCB).
1.Find Pd (VinIin when the output is short-circuited).
2. Plot Pd against 25C.
3. Connect Pd to the point corresponding to the 140C with a
straight line.
4. Pull a vertical line from the maximum operating temperature in
your design (e.g., 75C).
5. Read the value of Pd against the point at which the vertical line
intersects the derating curve(DPd).
6.DPd(Vinmax-Vout)=Iout (at 75C)
The maximum output current at the highest operating
temperature will be Iout DPd (Vinmax-Vout).
Please use the device at low temperature with better
radiation. The lower temperature provides better quality.
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 22 - 2011/02
12-4-
. ON/OFF Control
It is recommended to turn the regulator off when the
circuit following the regulator is not operating. A design
with small electric power loss can be implemented.
Because the control current is small, it is possible to
control it directly by CMOS logic.
Control Terminal Voltage (Vcont)
ON/OFF State
Vcont > 1.8V
ON
Vcont < 0.35V
OFF
Parallel Connected ON/OFF Control
Fig.13-4
Fig.13-4 shows the multiple regulators being controlled
by a single ON/OFF control signal. There is fear of
overheating, because the power loss of the low voltage
side (TK70520S) is large. The series resistor (R) is put in
the input line of the low output voltage regulator in order
to prevent over-dissipation. The voltage dropped across
the resistor reduces the large input-to-output voltage
across the regulator, reducing the power dissipation in the
device. When the thermal sensor works, a decrease of the
output voltage, oscillation, etc. may be observed.
12-5-
. Noise Bypass
The noise characteristics depend on the capacitance on
the Np terminal.
A standard value is Cnp=0.001F. Increase Cnp in a
design with important output noise requirements. The IC
will not be damaged even the capacitor value is increased.
The on/off switching speed changes depending on the
Np terminal capacitance. The switching speed slows
when the capacitance is large.
12-6-
. The notes of the evaluation when
output terminal is short-circuit to GND
By the resonance phenomenon by Cout (C ingredient)
and the short circuit line (L ingredient), which are
attached to an output terminal, an output terminal changes
with minus potential. In order that Parasitism Tr arises
within Bip IC, and a latch rise phenomenon may occur
within IC when the worst if it goes into an output
terminal's minus side, it results in damage by fire (white
smoke) and breakage of a package. (f0 = 1 / 2 (L C))
The above-mentioned resonance phenomenon appears
notably in a ceramic capacitor with the small ESR value,
etc. A resonance phenomenon can be reduced by
connecting resistance (around 2ohms or more) in series
with a short circuit line. Thereby, the latch rise
phenomenon within IC can be prevented.
Generally, when using tantalum or large electrolysis
capacitor, the influence of resonance phenomenon can be
reduced due to the large ESR (2ohms or more).
2.0V
5V
3.3V
On/Off Cont.
Vin
TK
70550S
R
TK
70533S
TK
70520S
Vout
[TK705xxS/TK707xxS,TK706xxH/TK708xxH]
AP-MS0027-E-00 - 23 - 2011/02
IMPORTANT NOTICE
These products and their specifications are subject to change without notice.
When you consider any use or application of these products, please make inquiries the sales office of
Asahi Kasei Microdevices Corporation (AKM) or authorized distributors as to current status of the
products.
Descriptions of external circuits, application circuits, software and other related information contained
in this document are provided only to illustrate the operation and application examples of the
semiconductor products. You are fully responsible for the incorporation of these external circuits,
application circuits, software and other related information in the design of your equipments. AKM
assumes no responsibility for any losses incurred by you or third parties arising from the use of these
information herein. AKM assumes no liability for infringement of any patent, intellectual property, or
other rights in the application or use of such information contained herein.
Any export of these products, or devices or systems containing them, may require an export license or
other official approval under the law and regulations of the country of export pertaining to customs
and tariffs, currency exchange, or strategic materials.
AKM products are neither intended nor authorized for use as critical componentsNote1) in any safety,
life support, or other hazard related device or systemNote2), and AKM assumes no responsibility for
such use, except for the use approved with the express written consent by Representative Director of
AKM. As used here:
Note1) A critical component is one whose failure to function or perform may reasonably be expected to
result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system
containing it, and which must therefore meet very high standards of performance and reliability.
Note2) A hazard related device or system is one designed or intended for life support or maintenance of
safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to
function or perform may reasonably be expected to result in loss of life or in significant injury or damage to
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