LT1304-5 LINER [Linear Technology], LT1304-5 Datasheet - Page 4

• Manufacturer Part Number: LT1304-5
• Description: Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFORMANCE CHARACTERISTICS
LT1304/LT1304-3.3/LT1304-5
PIN
4
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 500 A. Low-battery detector remains active
when device is shut down.
V
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.
IN
U
(Pin 3): Input Supply. Must be bypassed close (< 0.2")
AC COUPLED
FUNCTIONS
100mV/DIV
200mA
U
I
V
LOAD
OUT
0
Load Transient Response
U
100 s/DIV
W
U
1304 G07
Burst Mode is a trademark of Linear Technology Corporation.
I
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 V
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.
LIM
(Pin 6): Current Limit Set Pin. Float for 1A peak switch
AC COUPLED
100mV/DIV
500mA/DIV
5V/DIV
V
V
OUT
SW
I
L
Burst Mode
V
V
I
L = 22 H
LOAD
IN
OUT
= 2.5V
= 5V
= 185mA
TM
IN
Operation
20 s/DIV
.
1304 G08