RT9010

RT9010
300mA LDO Regulator with POR
General Description
Features
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.
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Wide Operating Voltage Ranges : 2.5V to 5.5V
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Low-Noise for RF Application
No Noise Bypass Capacitor Required
Fast Response in Line/Load Transient
TTL-Logic-Controlled Shutdown Input
Low Temperature Coefficient
300mA LDO Outputs
High Accuracy ±2%
Short Circuit Protection
Thermal Shutdown Protection
Current Limit Protection
Short Circuit Thermal Folded Back Protection
Tiny TSOT-23-6 Package
RoHS Compliant and 100% Lead (Pb)-Free
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.
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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.
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Applications
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Ordering Information
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RT9010-
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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
Note :
Richtek products are :
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RoHS compliant and compatible with the current require-
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CDMA/GSM Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Appliances
Pin Configurations
(TOP VIEW)
VIN
6
EN SET
5
4
2
3
VOUT GND POR
TSOT-23-6
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
ments of IPC/JEDEC J-STD-020.
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Suitable for use in SnPb or Pb-free soldering processes.
DS9010-05 April 2011
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1
RT9010
Typical Application Circuit
100K
6
VIN
VIN
POR
1uF
3
POR
RT9010
Chip Enable
5
4
VOUT
1
1uF
EN
SET
GND
VOUT
2
CDELAY
Functional Pin Description
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.
Function Block Diagram
EN
Shutdown
and
Logic Control
0.2uA
VIN
-
VREF
+
Error
Amplifier
MOS Driver
VOUT
Current Limit
and
Thermal
Protection
GND
SET
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2
POR & Delay
DS9010-05 April 2011
RT9010
Absolute Maximum Ratings
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(Note 1)
Supply Input Voltage -----------------------------------------------------------------------------------------------------Other I/O Pin Voltages --------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C
TSOT-23-6 ------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2)
TSOT-23-6, θJA ------------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------
Recommended Operating Conditions
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−0.3V to 6V
−0.3V to 6V
0.455W
220°C/W
260°C
150°C
−65°C to 150°C
2kV
200V
(Note 4)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V
Enable Input Voltage ------------------------------------------------------------------------------------------------------ 0V to 5.5V
Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = VOUT + 1V, VEN = VIN, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified.)
Parameter
Symbol
Input Voltage
Dropout Voltage
VIN
(Note 5)
VDROP
Test Conditions
Min
Typ
Max
Unit
2.5
--
5.5
V
IOUT = 150mA, VOUT > 2.8V
--
120
--
mV
IOUT = 300mA, VOUT > 2.8V
--
240
--
mV
1.2
--
3.6
V
VIN = 2.5V to 5.5V
Output Voltage Range
VOUT
Output Voltage Accuracy
ΔVOUT
IOUT = 1mA
−2
--
+2
%
Line Regulation
ΔVLINE
VIN = (V OUT + 0.3V) to 5.5V or
VIN > 2.5V, whichever is larger
--
--
0.2
%/V
Load Regulation
ΔVLOAD 1mA < IOUT < 300mA
--
--
0.6
%
Current Limit
ILIM
RLOAD = 1Ω
330
450
700
mA
Quiescent Current
IQ
VEN > 1.5V
--
58
80
μA
Shutdown Current
IQ_SD
VEN < 0.4V
--
--
1
μA
EN Threshold Voltage
Logic-High VIH
VIN = 2.5V to 5.5V, Power On
1.5
--
--
Logic-Low
VIN = 2.5V to 5.5V, Shutdown
--
--
0.4
--
100
--
ppm/°C
VIL
Output Voltage TC
V
Thermal Shutdown
T SD
--
170
--
°C
Thermal Shutdown Hysteresis
ΔTSD
--
40
--
°C
To be continued
DS9010-05 April 2011
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3
RT9010
Parameter
PSRR
Loading=10mA
PSRR
Loading=150mA
Symbol
Min
Typ
Max
Unit
f =100Hz
--
−65
--
dB
f =1kHz
--
−60
--
dB
f =10kHz
--
−50
--
dB
f =100Hz
--
−65
--
dB
f =1kHz
--
−50
--
dB
f =10kHz
--
−50
--
dB
VTHL
Low Threshold, % of nominal V OUT
(Flag On)
90
--
--
%
VTHH
High Threshold, % of nominal V OUT
(Flag Off)
--
--
96
%
PSRR
PSRR
Test Conditions
Reset Threshold
POR Output Logic Low Voltage
VPOR_L IL = 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
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.
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DS9010-05 April 2011
RT9010
Typical Operating Characteristics
Output Voltage vs. Temperature
Output Voltage vs. Temperature
3.4
RT9010-18
1.85
Output Voltage (V)
Output Voltage (V)
1.9
1.8
1.75
RT9010-33
3.35
3.3
3.25
3.2
1.7
-50
-25
0
25
50
75
100
-50
125
-25
0
Temperature (°C)
RT9010-33
VIN = VEN = 4.3V
CIN = COUT 1uF/X7R
100
125
RT9010-33
TJ = 125°C
300
60
55
250
TJ = 25°C
200
150
TJ = -40°C
100
50
50
0
-50
-25
0
25
50
75
100
0
125
50
Temperature (°C)
0
PSRR
10000
RT9010-15
VIN = 4.3V ± 0.1V
CIN = COUT 1uF/X7R
ILOAD = 100mA
ILOAD = 50mA
-20
-40
ILOAD = 10mA
-60
-80
0.01
10
0.1
100
1
1000
10k
10000
Frequency (Hz)
(Hz)
DS9010-05 April 2011
100
150
200
250
300
Load Current (mA)
100k
100000
1000k
1000000
POR Delay Time (ms)
20
PSRR (dB)
75
Dropout Voltage vs. Load Current
350
Dropout Voltage (mV)
Quiescent Current (uA)
65
50
Temperature (°C)
Quiescent Current vs. Temperature
70
25
POR Delay
RT9010-28
1000
100
10
1
0.1
0.01
0.0001
0.0001
0.0010
0.001
0.0100
0.01
0.1000
0.1
1.0000
1
POR Setting Capacitance (uF)
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RT9010
Line Transient Response
Line Transient Response
RT9010-28, Both ILOAD = 10mA
VIN = 3.8V to 4.8V
RT9010-28, Both ILOAD = 1mA
VIN = 3.8V to 4.8V
4.8
4.8
VIN (V) 3.8
VIN (V) 3.8
VOUT
(10mV/Div)
VOUT
(10mV/Div)
Time (100μs/Div)
Time (100μs/Div)
Line Transient Response
Line Transient Response
RT9010-28, Both ILOAD = 50mA
VIN = 3.8V to 4.8V
RT9010-28, Both ILOAD = 100mA
VIN = 3.8V to 4.8V
4.8
4.8
VIN (V) 3.8
VIN (V) 3.8
VOUT
(10mV/Div)
VOUT
(10mV/Div)
Time (100μs/Div)
Time (100μs/Div)
Load Transient Response
Load Transient Response
RT9010-33, ILOAD = 10mA to 100mA
VIN = VEN = 4.3V
CIN = COUT = 1uF/X7R
RT9010-33, ILOAD = 10mA to 50mA
VIN = VEN = 4.3V
CIN = COUT = 1uF/X7R
IOUT
(50mA/Div)
IOUT
(100mA/Div)
VOUT
(20mV/Div)
VOUT
(20mV/Div)
Time (250μs/Div)
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Time (250μs/Div)
DS9010-05 April 2011
RT9010
Start Up
EN Pin Shutdown Response
RT9010-28, VIN = 5V
IOUT = 50mA
(5V/Div)
RT9010-28, VIN = 5V
IOUT = 50mA
V EN
(5V/Div)
V EN
V OUT
(1V/Div)
V OUT
(1V/Div)
Time (5μs/Div)
Time (50μs/Div)
Power-On
Noise
RT9010-28
ILOAD = 10mA
RT9010-33, No LOAD
V = VEN = 4.5V(By battery)
150 IN
CIN = COUT = 1uF/X7R
100
Noise (μV/Div)
VEN
(5V/Div)
VOUT
(2V/Div)
POR
(5V/Div)
50
0
-50
-100
-150
Time (10μs/Div)
Time (10ms/Div)
Noise
300
RT9010-33, ILOAD = 50mA
VIN = VEN = 4.5V(By battery)
CIN = COUT = 1uF/X7R
Noise (μV/Div)
200
100
0
-100
-200
-300
Time (10ms/Div)
DS9010-05 April 2011
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RT9010
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.
Region of Stable COUT ESR vs. Load Current
Region
ESR (Ω)
(Ω)
OUT ESR
RegionofofStable
StableCCOUT
100
RT9010-28, VIN = 5V
CIN = 1uF/X7R
10
Unstable Region
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.
VOUT Short to GND
0.4V
VOUT
IOUT
TSD
170 °C
110 °C
OTP Trip Point
110 °C
IC Temperature
80 °C
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
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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 :
Stable Region
0.1
0.01
Simulation Verify Unstable Region
0.001
0
50
100
150
200
Load Current (mA)
Figure 1. Stable Cout ESR Range
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250
300
PD(MAX) = ( TJ(MAX) − TA ) /θJA
Where T J(MAX) is the maximum operation junction
temperature 125°C, TA is the ambient temperature and the
θJA is the junction to ambient thermal resistance.
DS9010-05 April 2011
RT9010
For recommended operating conditions specification of
RT9010, where T J(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 T J(MAX) and thermal
resistance θJA. For RT9010 packages, the Figure 3 of derating curves allows the designer to see the effect of rising
ambient temperature on the maximum power allowed.
0.50
Power Dissipation (W)
0.45
0.40
0.35
TSOT-23-6
0.30
0.25
0.20
0.15
0.10
0.05
0.00
0
25
50
75
100
125
Ambient Temperature (°C)
Figure 3. Derating Curves for RT9010 Packages
DS9010-05 April 2011
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9
RT9010
Outline Dimension
H
D
L
C
B
b
A
A1
e
Dimensions In Millimeters
Dimensions In Inches
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
TSOT-23-6 Surface Mount Package
Richtek Technology Corporation
Richtek Technology Corporation
Headquarter
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
5F, No. 95, Minchiuan Road, Hsintien City
Hsinchu, Taiwan, R.O.C.
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)86672399 Fax: (8862)86672377
Email: [email protected]
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.
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DS9010-05 April 2011