RT9170
300mA CMOS LDO Regulator
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 15uA 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 accuracy, 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
Lead Plating System P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage 12 : 1.2V
13 : 1.3V
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32 : 3.2V
33 : 3.3V
Note :
Richtek products are :
`RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
`Suitable for use in SnPb or Pb-free soldering processes.
with 15μA Quiescent Current
Features
zUltra-Low Quiescent Current (Typically 15uA)
zGuaranteed 300mA Output Current
zLow Dropout : 240mV at 300mA
zWide Operating Voltage Ranges : 2V to 5.5V
zFast Transient Response
zTight Load and Line Regulation
zTTL-Logic-Controlled Enable Input
zCurrent Limiting & Thermal Protection
zOnly 1uF Output Capacitor Required for Stability
zHigh Power Supply Rejection Ratio
zCustom Voltage Available
zRoHS Compliant and 100% Lead (Pb)-Free
Applications
zCellular Phones and Pagers
zBattery-Powered Equipment
zLaptop, Palmtops, Notebook Computers
zHand-Held Instruments
zPCMCIA Cards
Pin Configurations
(TOP VIEW)
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VIN |
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EN |
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NC |
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GND VOUT |
GND VIN VOUT |
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SOT-23-3 |
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SOT-23-5 |
1 |
2 |
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Marking Information |
GND |
VIN |
VOUT |
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For marking information, contact our sales representative |
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SOT-89 |
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directly or through a Richtek distributor located in your |
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DS9170-14 April 2011 |
www.richtek.com |
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RT9170
Typical Application Circuit
VIN |
VIN |
VOUT |
VOUT |
CIN |
RT9170- |
xB |
COUT |
1uF |
1uF |
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Chip Enable |
EN GND |
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Functional Pin Description
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Pin No. |
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Pin Name |
Pin Function |
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SOT-23-3 |
SOT-23-5 |
SOT-89 |
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3 |
2 |
2 |
VIN |
Power Input Voltage. |
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3 |
3 |
VOUT |
Output Voltage. |
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1 |
1 |
1 |
GND |
Ground. |
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5 |
- |
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Chip Enable (Active Low). |
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EN |
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- |
4 |
- |
NC |
No Internal Connection. |
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Function Block Diagram
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VIN |
+ |
Current Limit |
& |
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- |
Thermal Shutdown |
EN |
VOUT |
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GND |
www.richtek.com |
DS9170-14 April 2011 |
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RT9170 |
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Absolute Maximum Ratings (Note 1) |
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z Supply Input Voltage ------------------------------------------------------------------------------------------------ |
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7V |
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z Power Dissipation, PD @ TA = 25°C |
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SOT-23-3--------------------------------------------------------------------------------------------------------------- |
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0.4W |
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SOT-23-5--------------------------------------------------------------------------------------------------------------- |
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0.4W |
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SOT-89 ----------------------------------------------------------------------------------------------------------------- |
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0.571W |
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z Package Thermal Resistance (Note 2) |
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SOT-23-3, θJA --------------------------------------------------------------------------------------------------------- |
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250°C/W |
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SOT-23-5, θJA --------------------------------------------------------------------------------------------------------- |
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250°C/W |
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SOT-89, θJA ----------------------------------------------------------------------------------------------------------- |
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175°C/W |
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z Junction Temperature ----------------------------------------------------------------------------------------------- |
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150°C |
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z Storage Temperature Range --------------------------------------------------------------------------------------- |
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−65°C to 150°C |
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z ESD Susceptibility |
(Note 3) |
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HBM (Human Body Mode) ----------------------------------------------------------------------------------------- |
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2kV |
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MM (Machine Mode) ------------------------------------------------------------------------------------------------ |
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200V |
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Recommended Operating Conditions (Note 4) |
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z Supply Input Voltage ------------------------------------------------------------------------------------------------ |
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2V to 5.5V |
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z Enable Input Voltage ------------------------------------------------------------------------------------------------ |
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0V to 5.5V |
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z Junction Temperature Range -------------------------------------------------------------------------------------- |
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−40°C to 125°C |
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Electrical Characteristics |
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(VIN = VOUT + 1V, CIN = COUT = 1uF, TA = 25°C, unless otherwise specified) |
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Parameter |
Symbol |
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Test Conditions |
Min |
Typ |
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Max |
Unit |
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Output Voltage Accuracy |
VOUT |
IOUT = 1mA |
−2 |
-- |
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+2 |
% |
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Current Limit |
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ILIM |
RLOAD = 1Ω |
300 |
-- |
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-- |
mA |
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Quiescent Current |
(Note 5) |
IQ |
V |
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≤ 0.6V, IOUT = 0mA |
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15 |
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μA |
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EN |
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Dropout Voltage |
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VDROP |
IOUT = 300mA |
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240 |
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mV |
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Line Regulation |
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VLINE |
VIN = (VOUT + 0.3V) to 5.5V, |
−0.3 |
0.018 |
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+0.3 |
%/V |
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IOUT = 1mA |
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Load Regulation |
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(Note 6) |
VLOAD |
1mA < IOUT < 300mA |
-- |
0.01 |
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0.04 |
%/mA |
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Standby Current |
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(Note 7) |
ISTBY |
V |
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≥ 2V (Shutdown), VIN = 5.5V |
-- |
0.1 |
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μA |
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EN |
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Logic-Low Voltage |
VIL |
VIN = 2V to 5.5V, Enable |
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-- |
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0.6 |
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EN Threshold |
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V |
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Logic-High Voltage |
VIH |
VIN = 2V to 5.5V, Shutdown |
2 |
-- |
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-- |
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Power Supply Rejection |
PSRR |
f = 1kHz, COUT = 1μF |
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−40 |
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dB |
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Thermal Shutdown Temperature |
TSD |
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150 |
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° |
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C |
DS9170-14 April 2011 |
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. 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 is recommended. Note 4. The device is not guaranteed to function outside its operating conditions
Note 5. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN - IOUT under no load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin current.
Note 6. 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 7. Standby current is the input current drawn by a regulator when the output voltage is disabled by a shutdown signal (VEN ≥ 2V). It is measured with VIN = 5.5V.
www.richtek.com |
DS9170-14 April 2011 |
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RT9170
Typical Operating Characteristics
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2.55 |
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Temperature |
Stability |
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2.53 |
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No Load |
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2.51 |
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(V) |
2.49 |
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ILOAD = 250mA |
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Voltage |
2.47 |
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2.45 |
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2.43 |
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Output |
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2.41 |
VIN = 3.5V |
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2.39 |
VOUT = 2.5V |
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2.37 |
CIN = 1uF (Ceramic) |
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COUT = 1uF (Ceramic) |
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2.35 |
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-35 |
-15 |
5 |
25 |
45 |
65 |
85 |
105 |
125 |
Quiescent Current vs. Load Current
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18 |
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17 |
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(uA) |
16 |
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Current |
15 |
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14 |
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Quiescent |
13 |
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12 |
VIN = 3.5V |
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VOUT = 2.5V |
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11 |
CIN = 1uF (Ceramic) |
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10 |
COUT = 1uF (Ceramic) |
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0 |
0.05 |
0.1 |
0.15 |
0.2 |
0.25 |
0.3 |
Temperature (°C) |
Load Current (A) |
Quiescent Current vs. Temperature |
Quiescent Current vs. Supply Voltage |
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16 |
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ILOAD = 200mA |
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(uA) |
14 |
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12 |
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No Load |
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Current |
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10 |
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Quiescent |
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6 |
VIN = 3.5V |
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VOUT = 2.5V |
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CIN = 1uF (Ceramic) |
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2 |
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0 |
COUT = 1uF (Ceramic) |
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-35 |
-15 |
5 |
25 |
45 |
65 |
85 |
105 |
125 |
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16 |
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(uA) |
14 |
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12 |
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No Load |
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Current |
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10 |
ILOAD = 200mA |
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Quiescent |
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4 |
VOUT = 2.5V |
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CIN = 1uF (Ceramic) |
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COUT = 1uF (Ceramic) |
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2 |
2.5 |
3 |
3.5 |
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4.5 |
5 |
5.5 |
Temperature(°C) |
Supply Voltage (V) |
Dropout Voltage vs. Load Current
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300 |
VOUT = 3.3V |
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2.55 |
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(mV) |
250 |
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TJ = 125°C |
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2.53 |
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(V) |
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200 |
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Dropout Voltage |
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TJ = 25°C |
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Output Voltage |
2.51 |
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150 |
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TJ = -40°C |
2.49 |
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50 |
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2.47 |
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0 |
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2.45 |
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0 |
0.05 |
0.1 |
0.15 |
0.2 |
0.25 |
0.3 |
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Output Voltage vs. Supply Voltage
VOUT = 2.5V
CIN = 1uF (Ceramic)
COUT = 1uF (Ceramic)
ILOAD = 1mA
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
Load Current (A) |
Supply Voltage (V) |
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DS9170-14 April 2011 |
www.richtek.com |
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