LT1305_15 Datasheet, PDF (1/8 Pages) Linear Technology – Micropower High Power DC/DC Converter with Low-Battery Detector

FEATURES
s _{5V at 400mA from 2V Input}
s _{Supply Voltage As Low As 1.8V}
s _{120µA Quiescent Current}
s _{Low-Battery Detector}
s _{Low VCESAT Switch: 310mV at 2A Typ}
s _{Uses Inexpensive Surface Mount Inductors}
s _{8-Lead SO Package}
APPLICATI S
s _{2-Cell and 3-Cell to 5V Conversion}
s _{EL Panel Drivers}
s _{Portable Instruments}
LT1305
Micropower High Power
DC/DC Converter with
Low-Battery Detector
DESCRIPTIO
The LT^®1305 is a micropower step-up DC/DC converter
that uses Burst Mode^TM operation. Similar to the LT1303,
the LT1305 features a 2A internal low-loss switch and can
deliver up to four times the output power of the LT1303.
Quiescent current is only 120µA and the Shutdown pin
further reduces current to 10µA. A low-battery detector
provides an open-collector output that goes low when the
input voltage drops below a preset level. The LT1305 is
available in an 8-pin SO, easing board space requirements.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation
TYPICAL APPLICATI
2-Cell and 3-Cell to 5V/400mA DC/DC Converter
with Low-Battery Detect
L1
10µH
D1
2 TO 3
CELLS
316k
1%
C1
220µF
412k
1%
SHUTDOWN
V_IN
LBI
SW
LBO
LT1305
SHDN
GND
FB
PGND
100k
301k
1%
100k C2
1% 220µF
C1, C2: AVX TPSE227010R0100
D1: MOTOROLA MBRS130LT3
L1: COILCRAFT D03316-103
LOW BATTERY
GOES LOW AT
V_BAT = 2.2V
V_OUT
5V
400mA
LT1305 • TA03
Efficiency
90
V_IN = 4.00V
80
V_IN = 3.00V
V_IN = 2.00V
V_IN = 2.50V
70
60
1
10
100
LOAD CURRENT (mA)
1000
LT1305 • TA02
1