LINEAR TECHNOLOGY LT1308A LT1308B User Manual and Technical Specifications
Summary
These micropower DC/DC boost converters are engineered to deliver stable 5V power from single or multiple Li-Ion cells at higher currents (up to 1A). The comprehensive manual details advanced features, including automatic burst mode operation for ultra-low quiescent current draw and enhanced low-battery detection accuracy. Designed for engineers developing portable electronics—such as GSM phones, digital cameras, and GPS receivers—it offers a high-efficiency solution suitable for battery backup and demanding outdoor applications requiring reliability across wide voltage ranges.
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LT1308A/LT1308B
High Current, Micropower Single Cell, 600k Hz DC/DC Converters FEATURES DESCRIPTIO 5V at 1A from a Single Li-Ion Cell The LT®1308A/LT1308B are micropower, fixed frequency 5V at 800m A in SEPIC Mode from Four Ni Cd Cells step-up DC/DC converters that operate over a 1V to 10V Fixed Frequency Operation: 600k Hz input voltage range. They are improved versions of the Boost Converter Outputs up to 34V LT1308 and are recommended for use in new designs. The Starts into Heavy Loads LT1308A features automatic shifting to power saving Automatic Burst Mode TM Operation at Burst Mode operation at light loads and consumes just Light Load (LT1308A) 140μA at no load. The LT1308B features continuous Continuous Switching at Light Loads (LT1308B) switching at light loads and operates at a quiescent current Low VCESAT Switch: 300m V at 2A of 2.5m A. Both devices consume less than 1μA in Pin-for-Pin Upgrade Compatible with LT1308 shutdown.
Lower Quiescent Current in Shutdown: 1μA (Max)
Low-battery detector accuracy is significantly tighter than
Improved Accuracy Low-Battery Detector
the LT1308. The 200m V reference is specified at ±2% at
Reference: 200m V ±2% EF FI CI EN CY
room and ±3% over temperature. The shutdown pin
Available in 8-Lead SO and 14-Lead TSSOP Packages
enables the device when it is tied to a 1V or higher source and does not need to be tied to VIN as on the LT1308. An APPLICATIO internal VC clamp results in improved transient response and the switch voltage rating has been increased to 36V,
GSM/CDMA Phones
enabling higher output voltage applications.
Digital Cameras
The LT1308A/LT1308B are available in the 8-lead SO and
LCD Bias Supplies
the 14-lead TSSOP packages.
Answer-Back Pagers GPS Receivers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst
Mode is a registered trademark of Linear Technology Corporation. All other trademarks are
Battery Backup Supplies
the property of their respective owners.
Handheld Computers
TYPICAL APPLICATIO
Converter Efficiency
5V VIN = 3.6V VIN = 4.2V 1A
VIN SW
LBOLBI R1*
LT1308B 309k VIN = 2.5V
Li-Ion VIN = 1.5V
SHDNSHUTDOWN FB
VC GND
C1: AVX TAJC476M010 L1: MURATA LQH6C4R7 C2: AVX TPSD227M006 *R1: 887k FOR VOUT = 12V
D1: IR 10BQ015
LOAD CURRENT (m A)
Figure 1. LT1308B Single Li-Ion Cell to 5V/1A DC/DC Converter 1308A/B F01b
1308abfa
Page Summary Contents For LINEAR TECHNOLOGY LT1308A LT1308B User Manual and Technical Specifications
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 777.17 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the operating voltage range for the LT1308A/LT1308B?
The device operates over a 1V to 10V input range, and the switch voltage rating has been increased to 36V.
How do these converters perform under light load conditions?
The LT1308A uses Automatic Burst Mode operation for light loads (140μA at no load), while the LT1308B features continuous switching and operates at 2.5mA quiescent current.
Are there design compatibility considerations with older models?
Yes, they are pin-for-pin upgrade compatible with the LT1308 shutdown and feature a lower quiescent shutdown current of 1μA (Max).
What temperature ranges are available for these components?
They are available in commercial operational temperatures (0°C to 70°C) or industrial extended range (-40°C to 85°C).