LINEAR TECHNOLOGY LT1317 LT1317B Data Sheet Manual
Summary
The LT1317/LT1317B series are highly efficient micropower step-up DC/DC converters designed for reliable operation in battery-powered applications. Featuring a low starting voltage (down to 1.5V), Burst Mode, and an integrated Low-Battery Detector, these units maintain high efficiency across varying loads, from light standby to full power. This manual details the device's electrical characteristics and offers circuit examples, making it essential for engineers developing diagnostic medical instrumentation, portable electronic equipment, or communication devices like pagers and GPS receivers.
Page 1 Text Content
LT1317/LT1317B
Micropower, 600k Hz PWM DC/DC Converters
FEATURES DESCRIPTION
100µA Quiescent Current The LT®1317/LT1317B are micropower, fixed frequency Operates with VIN as Low as 1.5V step-up DC/DC converters that operate over a wide input 600k Hz Fixed Frequency Operation voltage range of 1.5V to 12V. The LT1317 features auto- Starts into Full Load matic shifting to power saving Burst Mode TM operation at Low-Battery Detector Active in Shutdown light loads. High efficiency is maintained over a broad Automatic Burst Mode Operation at 300µA to 200m A load range. Peak switch current during Light Load (LT1317) Burst Mode operation is kept below 250m A for most
Continuous Switching at Light Loads (LT1317B) operating conditions which results in low output ripple Low VCESAT Switch: 300m V at 500m A voltage, even at high input voltages. The LT1317B does
Pin for Pin Compatible with the LT1307/LT1307B not shift into Burst Mode operation at light loads, eliminat-
ing low frequency output ripple at the expense of light load efficiency.
APPLICATIONS
The LT1317/LT1317B contain an internal low-battery de-
EF FI CI EN CY
Cellular Telephones
tector with a 200m V reference that stays alive when the
Cordless Telephones
device goes into shutdown.
Pagers
No-load quiescent current of the LT1317 is 100µA and
GPS Receivers
shuts down to 30µA. The internal NPN power switch
Battery Backup
handles a 500m A current with a voltage drop of just
Portable Electronic Equipment
Glucose Meters Diagnostic Medical Instrumentation The LT1317/LT1317B are available in MS8 and SO-8
packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
2-Cell to 3.3V Converter Efficiency
2.2VIN 3VIN
VIN SW
1.65VIN
LBI FB
LT1317 R1
SHDNSHUTDOWN LBO
CELLS 1%
VC GND
CC 3.3n F
D1: MBR0520
L1: SUMIDA CD43-100
* FOR 5V OUTPUT, R2 = 332k, 1% 0.3
LOAD CURRENT (m A)
Figure 1. 2-Cell to 3.3V Boost Converter
1317 TA01
Page Summary Contents For LINEAR TECHNOLOGY LT1317 LT1317B Data Sheet Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 16 |
| File Size | 398.51 KB |
| Published | June 01, 2026 |
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