RT9181-18PB RICHTEK [Richtek Technology Corporation], RT9181-18PB Datasheet

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RT9181-18PB

Manufacturer Part Number
RT9181-18PB
Description
150mA LDO Regulator with PGOOD
Manufacturer
RICHTEK [Richtek Technology Corporation]
Datasheet
150mA LDO Regulator with PGOOD
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.
output and consumes no input bias current. Other
features include current limiting, over temperature
protection, and under voltage lockout.
Ordering Information
Note :
RichTek Pb-free and Green products are :
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
DS9181-14 March 2007
RT9181-
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
100% matte tin (Sn) plating.
ments of IPC/JEDEC J-STD-020.
Package Type
B : SOT-23-5
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
Output Voltage
Default : 1.2V
18 : 1.8V
cial Standard)
The EN pin
controls the
Features
Applications
Pin Configurations
Typical Application Circuit
Low Dropout Voltage Regulator
Up to 150mA Output Current
Power Good (PGOOD) Function
Chip Enable/Shutdown Function
Load Independent, Low Quiescent Current, 160μ μ 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-23-5
RoHS Compliant and 100% Lead (Pb)-Free
Processor Power-Up Sequencing
Laptop, Notebook, and Palmtop Computers
V
IN
Chip Enable
1uF
C
IN
Package
GND
VIN
EN
1
3
(TOP VIEW)
VIN
EN
SOT-23-5
1
2
3
GND
PGOOD
VOUT
2
5
4
VOUT
4
5
PGOOD
RT9181
www.richtek.com
10K
C
1uF
OUT
V
PGOOD
OUT
1

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RT9181-18PB Summary of contents

Page 1

... LDO Regulator with PGOOD 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) ...

Page 2

... RT9181 Function Block Diagram VIN EN Functional Pin Description Pin Name VIN Power Input Voltage GND Ground EN Chip Enable (Active High) PGOOD Power Good Indicator VOUT Output Voltage Timing Diagram 90% max PGOODH V OUT PGOOD www.richtek.com 2 Shutdown Undervoltage Current Control Lockout Limit ...

Page 3

... Output reaches % PGOODH timer (power good 3.3V 2mA See timing diagram D(PGOOD) Maximum voltage overshoot allowed on V PGOODL output during power-up RT9181 0.4W − 65°C to 150°C − 40°C to 110°C Min Typ −1.5 -- −2 -- 160 300 90 160 −0 ...

Page 4

... RT9181 Parameter Thermal Shutdown Temperature Thermal Shutdown Hysteresis Power Supply Rejection Rate 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 ...

Page 5

... Output Voltage vs. Supply Voltage 1.210 1.205 1.200 1.195 1.190 3.0 3.5 4.0 4.5 Supply Voltage (V) Current Limit vs. Supply Voltage 400 350 300 250 200 3 3.5 4 4.5 Supply Voltage (V) Quiescent Current vs. Temperature 180 175 170 165 160 155 150 - Temperature (°C) RT9181 I = 0.1mA OUT 5.0 5.5 6 www.richtek.com 5 ...

Page 6

... RT9181-18 4.5 5.0 5.5 6.0 Line Transient Response ≈ 5.5 4.5 Time (1ms/Div) PGOOD Delay Time vs. Temperature 3.0 2.5 2.0 1.5 1.0 0.5 0.0 - Temperature (°C) UVLO Response at Power ≈ 1.5 1 0.5 0 Time (5ms/Div) DS9181-14 March 2007 V = 4 1uF OUT I = 150mA O ≈ RT9181- ≈ 1uF OUT ...

Page 7

... PGOOD Response at Power Down ≈ 1.2V 0.5 0 Time (25us/Div) DS9181-14 March 2007 ≈ ≈ 1uF OUT RT9181 PGOOD Response vs. V OUT 2ms delay V IN Time (1ms/Div) www.richtek.com ≈ ...

Page 8

... RT9181 must be carefully selected for regulator stability and performance. Using a capacitor whose value is ≥ 1μF on the RT9181 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" from the input pin of the IC and returned to a clean analog ground. = +110° ...

Page 9

... DS9181-14 March 2007 Reverse Current Path The power transistor used in the RT9181 has an inherent diode connected between each regulator input and output (see Figure 1). If the output is forced above the input by more than a diode-drop, this diode will become forward ...

Page 10

... RT9181 Outline Dimension Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com Dimensions In Millimeters Min Max 0.889 1.295 0.000 0.152 1.397 1.803 0.356 0.559 2.591 2 ...

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