LT1304 查看數據表（PDF） - Linear Technology

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LT1304

Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown

Linear Technology 

LT1304/LT1304-3.3/LT1304-5

TYPICAL PERFORMANCE CHARACTERISTICS

Load Transient Response

VOUT

100mV/DIV

AC COUPLED

ILOAD

200mA

0

100µs/ DIV

1304 G07

Burst ModeTM Operation

VOUT

100mV/DIV

AC COUPLED

VSW

5V/DIV

IL

500mA/DIV

VIN = 2.5V

VOUT = 5V

ILOAD = 185mA

L = 22µH

20µs/ DIV

1304 G08

Burst Mode is a trademark of Linear Technology Corporation.

PIN FUNCTIONS

LBI (Pin 1): Low-Battery Detector Input. When voltage on

this pin is less than 1.17V, detector output is low.

LBO (Pin 2): Low-Battery Detector Output. Open collector

can sink up to 500µA. Low-battery detector remains active

when device is shut down.

VIN (Pin 3): Input Supply. Must be bypassed close (< 0.2")

to the pin. See required layout in the Typical Applications.

SW (Pin 4): Collector of Power NPN. Keep copper traces on

this pin short and direct to minimize RFI.

GND (Pin 5): Device Ground. Must be low impedance;

solder directly to ground plane.

ILIM (Pin 6): Current Limit Set Pin. Float for 1A peak switch

current; a resistor to ground will lower peak current.

SHDN (Pin 7): Shutdown Input. When low, switching

regulator is turned off. The low-battery detector remains

active. The SHDN input should not be left floating. If SHDN

is not used, tie the pin to VIN.

FB/SENSE (Pin 8): On the LT1304 (adjustable) this pin

goes to the comparator input. On the fixed-output ver-

sions, the pin connects to the resistor divider which sets

output voltage. The divider is disconnected from the pin

during shutdown.

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