RT9010
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DS9010-05 April 2011 www.richtek.com
Pin Configurations
Ordering Information
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
300mA LDO Regulator with POR
(TOP VIEW)
General Description
RT9010 is a low noise, and low dropout with the sourcing
ability up to 300mA and power-on reset function. The range
of output voltage is from 1.2V to 3.6V by operating from
2.5V to 5.5V input.
RT9010 offers 2% accuracy, extremely low dropout voltage
(240mV @ 300mA), and extremely low ground current.
The shutdown current is near zero current which is suitable
for battery-power devices. Other features include current
limiting, over temperature, output short circuit protection.
RT9010 is short circuit thermal folded back protected.
RT9010 lowers its OTP trip point from 165°C to 110°C
when output short circuit occurs (VOUT < 0.4V) providing
maximum safety to end users.
RT9010 can operate stably with very small ceramic output
capacitors, reducing required board space and component
cost. RT9010 is available in fixed output voltages in the
TSOT-23-6 package.
Features
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zWide Operating Voltage Ranges : 2.5V to 5.5V
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zLow-Noise for RF Application
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zNo Noise Bypa ss Capacitor Required
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zFast Response in Line/Load Transient
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zTTL-Logic-Controlled Shutdown Input
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zLow Temperature Coefficient
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z300mA LDO Outputs
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zHigh Accuracy ±±
±±
±2%
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zShort Circuit Protection
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zThermal Shutdown Protection
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zCurrent Limit Protection
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zShort Circuit Thermal Folded Back Protection
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zTiny TSOT-23-6 Package
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zRoHS Compliant and 100% Lead (Pb)-Free
Applications
zCDMA/GSM Cellular Handsets
zBattery-Powered Equipment
zLaptop, Palmtops, Notebook Computers
zHand-Held Instruments
zPCMCIA Cards
zPortable Information Appliances
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
TSOT-23-6
VOUT GND POR
VIN EN SET
4
23
56
RT9010-
Package Type
J6 : TSOT-23-6
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage
12 : 1.20V
13 : 1.30V
:
:
35 : 3.50V
36 : 3.60V
1H : 1.85V
2F : 2.65V
2H : 2.85V
RT9010
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DS9010-05 April 2011www.richtek.com
Functional Pin Description
Function Block Diagram
Pin No. Pin Name Pin Function
1 VOUT Output Voltage.
2 GND Common Ground.
3 POR Power-On Reset Output : Open-drain output. Active low indicates an
output under voltage condition on regulator.
4 SET Delay Set Input. Connect external capacitor to GND to set the internal
delay.
5 EN Chip Enable (Active High).
6 VIN Supply Input Voltage.
Typical Application Circuit
EN
VOUT
RT9010
GND
VIN
1uF
VOUT
1uF
VIN POR
Chip Enable
100K
SET
CDELAY
42
3
5
6
1
POR
EN
Current Limit
and
Thermal
Protection
MOS Driver
+
-
VOUT
Shutdown
and
Logic Control
VIN
Error
Amplifier
VREF
GND
POR & DelaySET
0.2uA
RT9010
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DS9010-05 April 2011 www.richtek.com
Electrical Characteristics
Recommended Operating Conditions (Note 4)
zSupply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V
zEnable Input Voltage ------------------------------------------------------------------------------------------------------ 0V to 5.5V
zJunction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
zAmbient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Absolute Maximum Ratings (Note 1)
zSupply Input Voltage ------------------------------------------------------------------------------------------------------ −0.3V to 6V
zOther I/O Pin Voltages --------------------------------------------------------------------------------------------------- −0.3V to 6V
zPower Dissipation, PD @ TA = 25°C
TSOT-23-6 ------------------------------------------------------------------------------------------------------------------- 0.455W
zPackage Thermal Resistance (Note 2)
TSOT-23-6, θJA ------------------------------------------------------------------------------------------------------------- 220°C/W
zLead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
zJunction Temperature ----------------------------------------------------------------------------------------------------- 150°C
zStorage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
zESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
(VIN = VOUT + 1V, VEN = VIN, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified.)
Parameter Symbol Test Conditions Min Typ Max Unit
Input Voltage VIN V
IN = 2.5V to 5.5V 2.5 -- 5.5 V
IOUT = 150mA, VOUT > 2.8V -- 120 -- mV
Dropout Voltage (Note 5) VDROP IOUT = 300mA, VOUT > 2.8V -- 240 -- mV
Output Voltage Range VOUT 1.2 -- 3.6 V
Output Voltage Accuracy ΔVOUT I
OUT = 1mA −2 -- +2 %
Line Regulation ΔVLINE VIN = (VOU T + 0.3V) to 5.5V or
VIN > 2.5V, w hic hever is larger -- -- 0.2 %/V
Load Regulation ΔVLOAD 1mA < IOU T < 300mA -- -- 0.6 %
Current Limit ILIM R
LOAD = 1Ω 330 450 700 mA
Quiescent Current IQ V
EN > 1.5V -- 58 80 μA
Shutdown Current IQ_SD V
EN < 0.4V -- -- 1 μA
Logic-High VIH V
IN = 2.5V to 5.5V, Power On 1.5 -- --
EN Threshold Voltage Logic-Low VIL V
IN = 2.5V to 5.5V, Shutdown -- -- 0.4 V
Output Voltage TC -- 100 -- ppm/°C
Thermal Shutdown TSD -- 170 -- °C
Thermal Shutdown Hysteresis ΔTSD -- 40 -- °C
To be continued
RT9010
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DS9010-05 April 2011www.richtek.com
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV.
Parameter Symbol Test Conditions Min Typ Max Unit
f =100Hz -- −65 -- dB
f =1kHz -- −60 -- dB
PSRR
Loading=10mA PSRR
f =10kHz -- −50 -- dB
f =100Hz -- −65 -- dB
f =1kHz -- −50 -- dB
PSRR
Loading=150mA PSRR
f =10kHz -- −50 -- dB
VTHL Low Threshold, % of nominal VOU T
(Flag On) 90 -- -- %
Reset Threshol d
VTHH High Threshold, % of nominal VOU T
(Flag Off) -- -- 96 %
POR Output Logic Low Voltage VPOR_L I
L = 250μA -- 0.02 0.1 V
POR Leakage Current IPOR Flag off −1 0.01 1 μA
Set pin current source VSET = 0 0.60 1.25 1.70 μA
Set pin threshold POR = high -- 1.4 -- V
RT9010
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DS9010-05 April 2011 www.richtek.com
Typical Operating Characteristics
Output Voltage vs. Temperature
1.7
1.75
1.8
1.85
1.9
-50 -25 0 25 50 75 100 125
Temperature
Output Voltage (V)
RT9010-18
(°C)
Output Voltage vs. Temperature
3.2
3.25
3.3
3.35
3.4
-50 -25 0 25 50 75 100 125
Temperature
Output Voltage (V)
RT9010-33
(°C)
Dropout Voltage vs. Loa d Curre nt
0
50
100
150
200
250
300
350
0 50 100 150 200 250 300
Load Current (mA)
Dropout Voltage (mV)
RT9010-33
TJ = 25°C
TJ = -40°C
TJ = 125°C
Quiescent Current vs. Temperature
50
55
60
65
70
-50 -25 0 25 50 75 100 125
Temperature
Quiescent Current (uA)
RT9010-33
VIN = VEN = 4.3V
CIN = COUT 1uF/X7R
(°C)
POR De lay
0.01
0.1
1
10
100
1000
10000
0.0001 0.0010 0.0100 0.1000 1.0000
POR Setting Capacitance (uF)
POR Delay Time (ms)
RT9010-28
0.0001 0.001 0.01 0.1 1
PSRR
-80
-60
-40
-20
0
20
10 100 1000 10000 100000 1000000
Frequency (Hz)
PSRR (dB)
ILOAD = 100mA
ILOAD = 10mA
ILOAD = 50mA
RT9010-15
VIN = 4.3V ± 0.1V
CIN = COUT 1uF/X7R
0.01 0.1 1 10k 100k 1000k
(Hz)
RT9010
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DS9010-05 April 2011www.richtek.com
Load Transient Response
Time (250μs/Div)
IOUT
(50mA/Div)
VOUT
(20mV/Div)
RT9010-33, ILOAD = 10mA to 50mA
VIN = VEN = 4.3V
CIN = COUT = 1uF/X7R
Load Transient Response
Time (250μs/Div)
IOUT
(100mA/Div)
VOUT
(20mV/Div)
RT9010-33, ILOAD = 10mA to 100mA
VIN = VEN = 4.3V
CIN = COUT = 1uF/X7R
RT9010-28, Both ILOAD = 100mA
VIN = 3.8V to 4.8V
Line Transient Response
Time (100μs/Div)
VOUT
(10mV/Div)
4.8
3.8
VIN (V)
RT9010-28, Both ILOAD = 50mA
VIN = 3.8V to 4.8V
Line Transient Response
Time (100μs/Div)
4.8
3.8
VOUT
(10mV/Div)
VIN (V)
RT9010-28, Both ILOAD = 1mA
VIN = 3.8V to 4.8V
Line Transient Response
VIN (V)
Time (100μs/Div)
4.8
3.8
VOUT
(10mV/Div)
RT9010-28, Both ILOAD = 10mA
VIN = 3.8V to 4.8V
Line Transient Response
VIN (V)
Time (100μs/Div)
4.8
3.8
VOUT
(10mV/Div)
RT9010
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DS9010-05 April 2011 www.richtek.com
Start Up
Time (5μs/Div)
RT9010-28, VIN = 5V
IOUT = 50mA
(5V/Div)
(1V/Div)
VEN
VOUT
Power-On
Time (10μs/Div)
RT9010-28
ILOAD = 10mA
VEN
(5V/Div)
VOUT
(2V/Div)
POR
(5V/Div)
Noise
Time (10ms/Div)
RT9010-33, No LOAD
VIN = VEN = 4.5V(By battery)
CIN = COUT = 1uF/X7R
Noise (μV/Div)
150
100
50
0
-50
-100
-150
EN Pin Shutdown Response
Time (50μs/Div)
RT9010-28, VIN = 5V
IOUT = 50mA
(5V/Div)
(1V/Div)
VEN
VOUT
Time (10ms/Div)
RT9010-33, ILOAD = 50mA
VIN = VEN = 4.5V(By battery)
CIN = COUT = 1uF/X7R
Noise (μV/Div)
300
200
100
0
-100
-200
-300
Noise
RT9010
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DS9010-05 April 2011www.richtek.com
Applications Information
Like any low-dropout regulator, the external capacitors used
with the RT9010 must be carefully selected for regulator
stability and performance. Using a capacitor whose value
is > 1μF on the RT9010 input and the amount of
capacitance can be increased without limit. The input
capacitor must be located a distance of not more than 0.5
inch from the input pin of the IC and returned to a clean
analog ground. Any good quality ceramic or tantalum can
be used for this capacitor. The capacitor with larger value
and lower ESR (equivalent series resistance) provides
better PSRR and line-transient response.
The output capacitor must meet both requirements for
minimum amount of capacitance and ESR in all LDOs
application. The RT9010 is designed specifically to work
with low ESR ceramic output capacitor in space-saving
and performance consideration. Using a ceramic capacitor
whose value is at least 1μF with ESR is > 20mΩ on the
RT9010 output ensures stability. The RT9010 still works
well with output capacitor of other types due to the wide
stable ESR range. Figure 1. shows the curves of allowable
ESR range as a function of load current for various output
capacitor values. Output capacitor of larger capacitance
can reduce noise and improve load transient response,
stability, and PSRR. The output capacitor should be located
not more than 0.5 inch from the VOUT pin of the RT9010
and returned to a clean analog ground.
Figure 1. Stable Cout ESR Range
VOUT Short to GND
0.4V
VOUT
IOUT
TSD
OTP Trip Point
170 C
°110 C
°
110 C
°
80 C
°
IC Temperature
Figure 2. Short Circuit Thermal Folded Back Protection
when Output Short Circuit Occurs (Patent)
For continuous operation, do not exceed absolute
maximum operation junction temperature 125°C. The
power dissipation definition in device is :
PD = (VIN − VOUT) x IOUT + VIN x IQ
The maximum power dissipation depends on the thermal
resistance of IC package, PCB layout, the rate of
surroundings airflow and temperature difference between
junction to ambient. The maximum power dissipation can
be calculated by following formula :
PD(MAX) = ( TJ(MAX) − TA ) /θJA
Where TJ(MAX) is the maximum operation junction
temperature 125°C, TA is the ambient temperature and the
θJA is the junction to ambient thermal resistance.
Thermal Considerations
Thermal protection limits power dissipation in RT9010.
When the operation junction temperature exceeds 170°C,
the OTP circuit starts the thermal shutdown function and
turns the pass element off. The pass element turn on again
after the junction temperature cools by 40°C. RT9010
lowers its OTP trip level from 170°C to 110°C when output
short circuit occurs (VOUT < 0.4V) as shown in Figure 2. It
limits IC case temperature under 100°C and provides
maximum safety to customer while output short circuit
occurring.
Region of Stable COUT ESR vs. Loa d Current
0.001
0.01
0.1
1
10
100
0 50 100 150 200 250 300
Load Current (mA)
Region of Stable C OUT ESR (Ω)
Region of Stable COUT ESR (Ω)
Unstable Region
Stable Region
Simulation Verify Unstable Region
RT9010-28, VIN = 5V
CIN = 1uF/X7R
RT9010
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DS9010-05 April 2011 www.richtek.com
Figure 3. Derating Curves for RT9010 Packages
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0 25 50 75 100 125
Ambient Temperature
Power Dissipation (W)
(°C)
TSOT-23-6
For recommended operating conditions specification of
RT9010, where TJ(MAX) is the maximum junction
temperature of the die (125°C) and TA is the operated
ambient temperature. The junction to ambient thermal
resistance (θJA is layout dependent) for TSOT-23-6 package
is 220°C/W on the standard JEDEC 51-3 single-layer
thermal test board. The maximum power dissipation at
TA = 25°C can be calculated by following formula :
PD(MAX) = ( 125°C - 25°C) / (220°C/W) = 0.455 W for
TSOT-23-6 packages
The maximum power dissipation depends on operating
ambient temperature for fixed TJ(MAX) and thermal
resistance θJA. For RT9010 packages, the Figure 3 of de-
rating curves allows the designer to see the effect of rising
ambient temperature on the maximum power allowed.
RT9010
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DS9010-05 April 2011www.richtek.com
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit
design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be
guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
Richtek Technology Corporation
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 95, Minchiuan Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)86672399 Fax: (8862)86672377
Email: marketing@richtek.com
Outline Dimension
TSOT-23-6 Surface Mount Package
Dime nsions In Millimeters Dimens ions In Inch e s
Symbol Min Max Min Max
A 0.700 1.000 0.028 0.039
A1 0.000 0.100 0.000 0.004
B 1.397 1.803 0.055 0.071
b 0.300 0.559 0.012 0.022
C 2.591 3.000 0.102 0.118
D 2.692 3.099 0.106 0.122
e 0.838 1.041 0.033 0.041
H 0.080 0.254 0.003 0.010
L 0.300 0.610 0.012 0.024
AA1
e
b
B
D
C
H
L
