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Preliminary
300mA, 15
µµ
µA Quiescent Current CMOS LDO Regulator
µµ
General Description
The RT9170 is CMOS ultra low quiescent current and low
dropout (ULDO) regulators. The devices are capable of
supplying 300mA of output current continuously.
The RT9170's performance is optimized for batterypowered systems to deliver 15µA ultra low quiescent
current and extremely low dropout voltage. Regulator
ground current increases only slightly in dropout, further
prolonging the battery life. The other features include ultra
low dropout voltage, high output accura cy , current limiting
protection, and high ripple rejection ratio.
The devices are available in fixed output voltages range of
1.2V to 3.3V with 0.1V per step. The RT9170 regulators
are available in SOT-23-3, SOT-23-5 and 3-lead SOT-89
packages.
Ordering Information
RT9170-
Package Type
V: SOT-23-3
B: SOT-23-5
X : SOT-89
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
Output Voltage
12 : 1.2V
13 : 1.3V
:
32 : 3.2V
33 : 3.3V
Note :
RichTek Pb-free 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.
−100%matte tin (Sn) plating.
RT9170
Features
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z Ultra-Low Quiescent Current (Typically 15
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z Guaranteed 300mA Output Current
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z Low Dropout: 240mV at 300mA
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z Wide Operating Voltage Ranges: 2V to 5.5V
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z Fast Transient Response
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z Tight Load and Line Regulation
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z TTL-Logic-Controlled Enable Input
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z Current Limiting & Thermal Protection
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z Only 1
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z High Power Supply Rejection Ratio
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z Custom Voltage Available
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z RoHS Compliant and 100% Lead (Pb)-Free
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Applications
z Cellular Phones and Pagers
z Battery-Powered Equipment
z Laptop, Palmtops, Notebook Computers
z Hand-Held Instruments
z PCMCIA Cards
Pin Configurations
µµ
µF Output Capacitor Required for Stability
µµ
(TOP VIEW)
VIN
3
1
GND VOUT
2
SOT-23-3
231
EN
54
23
1
GND
VIN VOUT
SOT-23-5
µµ
µA)
µµ
NC
VIN
Marking Information
For marking information, contact our sales re presentative
GND VOUT
(TAB)
SOT-89
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
DS9170-08 March 2005 www.richtek.com
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RT9170
Typical Application Circuit
Preliminary
V
IN
C
IN
1uF
Chip Enable
VIN
RT9170- CB
EN
Functional Pin Description
Pin No.
RT9170-CV RT9170-CB RT9170-CX
3 2 2 VIN Power Input Voltage
2 3 3 VOUT Output Voltage
1 1 1 GND Ground
- 5 -
- 4 - NC No Connection
Function Block Diagram
VOUT
GND
C
OUT
1uF
V
OUT
Pin Name Pin Function
EN
Chip Enable (Active Low)
EN
VIN
+
-
Current Limit
&
Thermal Shutdown
VOUT
GND
DS9170-08 March 2005www.richtek.com
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Preliminary
RT9170
Absolute Maximum Ratings (Note 1)
z Supply Input V oltage-------------------------------------------------------------------------------------------------- 7V
z Power Dissipation, P
D
@ T
= 25°C
A
SOT-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4W
SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 0.4W
SOT-89 ------------------------------------------------------------------------------------------------------------------- 0.571W
z Package Thermal Resistance (Note 7)
SOT-23-3, θJA---------------------------------------------------------------------------------------------------------- 250°C/W
SOT-23-5, θJA---------------------------------------------------------------------------------------------------------- 250°C/W
SOT-89, θJA------------------------------------------------------------------------------------------------------------- 175°C/W
z Junction Temperature------------------------------------------------------------------------------------------------ 150°C
z Storage Temperature Range--------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
z Supply Input Voltage ------------------------------------------------------------------------------------------------- 2V to 5.5V
z Enable Input Voltage ------------------------------------------------------------------------------------------------- 0V to 5.5V
z Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C
Electrical Characteristics
(V
= V
IN
+ 1V, CIN = C
OUT
OUT
= 1µF, T
Parameter Symbol Test Conditions Min Typ Max Units
Output Voltage Accuracy
Current Limit
Quiescent Current (Note 5)
Dropout Voltage
Line Regulation
Load Regulation (Note 4)
Standby Current (Note 6) I
Logic-Low Voltage
EN Threshold
Logic-Hi gh Voltage
Power Supply Rejection PSRR
Thermal Shutdown Temperature
= 25°C, unless otherwise specified)
A
∆V
I
LIM
I
Q
V
DROP
∆V
∆V
STBY
V
IL
V
IH
T
SD
I
OUT
R
LINE
1mA < I
LOAD
V
V
= 1mA
OUT
= 1Ω
LOAD
≤ 0.6V,
V
EN
= 300mA -- 240 --
I
OUT
V
= (V
IN
I
= 1mA
OUT
V
≥ 2V (Shutdown), VIN = 5.5V
EN
= 2V to 5.5V, Enable
IN
= 2V to 5.5V, Shutdown
IN
f = 1kHz, C
-- 150 --
= 0mA
IOUT
+ 0.3V) to 5.5V,
OUT
< 300mA
OUT
= 1µF
OUT
−2
300 -- --
-- 15 --
-- +2 %
mA
µA
mV
−0.3
0.018 +0.3 %/V
-- 0.01 0.04 %/mA
-- 0.1 --
µA
-- -- 0.6
V
2 -- --
--
−40
-- dB
°C
DS9170-08 March 2005 www.richtek.com
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RT9170
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. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions
Note 4. Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested for load
regulation in the load range from 1mA to 300mA.
Note 5. Quiescent, or ground current, is the difference between input and output currents. It is defined by I
load condition (I
current.
Note 6. Standby current is the input current drawn by a regulator when the output voltage is disabled by a shutdown signal
2V). It is measured with VIN = 5.5V.
(V
≥
EN
Note 7. θ
is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JA
JEDEC 51-3 thermal measurement standard.
= 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin
OUT
Preliminary
= IIN - I
Q
under no
OUT
DS9170-08 March 2005www.richtek.com
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