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LT1317CS8 Datasheet(PDF) 6 Page - Linear Technology

Part # LT1317CS8
Description  Micropower, 600kHz PWM DC/DC Converters
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1317CS8 Datasheet(HTML) 6 Page - Linear Technology

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LT1317/LT1317B
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation (LT1317)
VIN = 1.5V
ILOAD 25mA/DIV
1317 TPC19
VOUT = 5V
VOUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
Load Regulation (LT1317)
VIN = 2V
ILOAD 25mA/DIV
1317 TPC20
VOUT = 5V
VOUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
Load Regulation (LT1317)
VIN = 2.5V
ILOAD 50mA/DIV
1317 TPC21
VOUT = 5V
VOUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
Load Regulation (LT1317)
VIN = 1.5V
ILOAD 25mA/DIV
1317 TPC22
VOUT = 3.3V
Load Regulation (LT1317)
VIN = 2V
ILOAD 50mA/DIV
1317 TPC23
VOUT = 3.3V
Load Regulation (LT1317)
VIN = 2.5V
ILOAD 50mA/DIV
1317 TPC24
VOUT = 3.3V
VOUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
VOUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
VOUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
Note: For load regulation pictures, double lines are due to
output capacitor ESR.
VC (Pin 1): Compensation Pin for Error Amplifier. Con-
nect a series RC network from this pin to ground. Typical
values for compensation are a 33k/3.3nF combination. A
100pF capacitor from the VC pin to ground is optional and
improves noise immunity. Minimize trace area at VC.
FB (Pin 2): Feedback Pin. Reference voltage is 1.24V.
Connect resistor divider tap here. Minimize trace area at
FB. Set VOUT according to: VOUT = 1.24V(1 + R1/R2).
SHDN (Pin 3): Shutdown. Pull this pin low for shutdown
mode (only the low-battery detector remains active).
Leave this pin floating or tie to a voltage between 1.4V and
6V to enable the device. SHDN pin is logic level and need
only meet the logic specification (1.4V for high, 0.4V for
low).
PIN FUNCTIONS
GND (Pin 4): Ground. Connect directly to local ground
plane.
SW (Pin 5): Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to keep EMI down.
VIN (Pin 6): Supply Pin. Must be bypassed close to the
pin.
LBI (Pin 7): Low-Battery Detector Input. 200mV refer-
ence. Voltage on LBI must stay between ground and
700mV. Low-battery detector remains active in shutdown
mode.
LBO (Pin 8): Low-Battery Detector Output. Open collec-
tor, can sink 10
µA. A 1MΩ pull-up is recommended.



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