RT9181CB Richtek Technology Corporation, RT9181CB Datasheet

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RT9181CB

Manufacturer Part Number
RT9181CB
Description
150mA LDO regulator with POG
Manufacturer
Richtek Technology Corporation
Datasheet

Specifications of RT9181CB

Dc
0514

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
RT9181CB
Manufacturer:
RICHTEK
Quantity:
45 000
Part Number:
RT9181CB
Manufacturer:
RICHTEK/立錡
Quantity:
20 000
General Description
The RT9181 is a low dropout voltage regulator with
an output 2% accuracy and supply a continuous
150mA current within operating range from a +3V to
+5.5V input. The power good function monitors the
output voltage and indicates by pulling low the power
good output (open drain).
The RT9181 requires a small output capacitor with
low ESR for stabilizing output voltage. The device
also minimizes output overshoot during power up.
The RT9181 uses an internal PMOS as the pass
device, which consumes 160µA supply current
independent of load and dropout conditions. The CE
pin controls the output and consumes no input bias
current. Other features include current limiting, over
temperature protection, and under voltage lockout.
Applications
Ordering Information
RT9181
DS9181-00 February 2002
Processor Power-Up Sequencing
Laptop, Notebook, and Palmtop Computers
Package type
B : SOT-25
Operating temperature range
C: Commercial standard
Preliminary
150mA LDO Regulator with POG
Features
Pin Configurations
Typical Application Circuit
(Plastic SOT-25)
RT9181CB
Low Dropout Voltage Regulator, Output 1.2V
Up to 150mA Output Current
Power Good (POG) Function
Chip Enable/Shutdown Function
Load Independent, Low Ground Current, 160µ µ µ µ A
Current Limiting and Thermal Protection
Under Voltage Lockout (UVLO)
Low Variation Due to Load and Line Regulation
Output Stable with Low ESR Capacitors
SOT-25 Package
Part Number
V
IN
OFF
C
1µF
ON
IN
CE
VIN
GND
Pin Configurations
VOUT
5
1
POG
2
www.richtek-ic.com.tw
4
3
RT9181
10K
C
1µF
OUT
POG
V
TOP VIEW
1. VIN
2. GND
3. CE
4. POG
5. VOUT
OUT
1

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RT9181CB Summary of contents

Page 1

... Load Independent, Low Ground Current, 160µ µ µ µ A Current Limiting and Thermal Protection Under Voltage Lockout (UVLO) Low Variation Due to Load and Line Regulation Output Stable with Low ESR Capacitors SOT-25 Package Pin Configurations Part Number RT9181CB (Plastic SOT-25) Typical Application Circuit 1µF ...

Page 2

RT9181 Pin Description Pin Name VIN Input Pin GND Power Ground Pin CE Enable/Shutdown Input (Active High) POG Power Good Indicator VOUT Output Pin Function Block Diagram VIN Shutdown CE Control Thermal Sensor www.richtek-ic.com.tw 2 Preliminary Pin Function Undervoltage Lockout ...

Page 3

Absolute Maximum Ratings Input Voltage Input Voltage Power Good Output Voltage Power Dissipation SOT-25 Junction Temperature Range Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec.) Electrical Characteristics (V = ...

Page 4

RT9181 Typical Operating Charateristics Output Voltage vs. Temperature 1.210 1.205 1.200 1.195 1.190 - Temperature ( C) Current Limit vs. Temperature 400 350 300 250 200 - Temperature ( C) Quiescent Current vs. Temperature 180 175 ...

Page 5

POG Delay Time vs. Temperature 3.0 2.5 2.0 1.5 1.0 0.5 0.0 - Temperature ( C) Under Voltage Lock Out > 1 > 1 > 1 > V OUT > 2 ...

Page 6

RT9181 Timing Diagram VOUT POG Application Guides CE/Shutdown The RT9181 is enabled by driving the CE input high, and shutdown by pulling the input low. If this feature is not to be used, the CE input should be tied to ...

Page 7

– OUT IN OUT The GND pin of the RT9181 performs the dual function of providing an electrical connection to ground and channeling heat away, Connect the GND ...

Page 8

RT9181 Package Information Symbol www.richtek-ic.com.tw 8 Preliminary B A1 Dimensions In Millimeters Min Max 0.889 1.295 0.000 0.152 1.397 1.803 0.356 0.559 2.591 2.997 2.692 3.099 ...

Page 9

DS9181-00 February 2002 Preliminary RT9181 www.richtek-ic.com.tw 9 ...

Page 10

RT9181 RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 www.richtek-ic.com.tw 10 Preliminary RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, ...

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