LINEAR TECHNOLOGY LT1949 Data Sheet
Summary
This high-efficiency DC/DC converter utilizes a fixed 600kHz PWM technique to provide stable step-up power for sensitive electronics. Featuring a robust 1A, 0.5W internal switch and an integrated low-battery detector, it is ideal for powering large screen LCD bias supplies, GPS receivers, and portable medical diagnostic equipment. The manual provides comprehensive electrical specifications, pin compatibility details (pin-for-pin replacement with LT1317B), and typical application circuits to ensure optimal integration into low-profile designs.
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LT1949
600k Hz, 1A Switch PWM DC/DC Converter
FEATURES DESCRIPTIO 1A, 0.5Ω, 30V Internal Switch The LT®1949 is a fixed frequency step-up DC/DC con- Operates with VIN as Low as 1.5V verter with a 1A, 0.5Ω internal switch. Capable of gener- 600k Hz Fixed Frequency Operation ating 10V at 175m A from a 3.3V input, the LT1949 is ideal
Low-Battery Detector Stays Active in Shutdown for generating bias voltages for large screen LCD panels. Low VCESAT Switch: 410m V at 800m A Constant frequency 600k Hz operation results in a low Pin-for-Pin Compatible with the LT1317B noise output that is easy to filter and the 30V switch rating Small 8-Lead MSOP and SO Packages allows output voltage up to 28V using a single inductor. An external compensation pin gives the user flexibility in optimizing loop compensation, allowing small low ESR
APPLICATIO S
ceramic capacitors to be used at the output. The 8-lead LCD Bias Supplies MSOP and SO packages ensure a low profile overall GPS Receivers solution.
Battery Backup
EF FI CI EN CY The LT1949 includes a low-battery detector that stays
Portable Electronic Equipment
alive when the device goes into shutdown. Quiescent
Diagnostic Medical Instrumentation
current in shutdown is 25µA, while operating current is 4.5m A. , LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO VIN 3.3V L1
D1 VOUT = 10V
10µH C1 VIN SW
4.2VIN 3VIN3.6VIN
LT1949
1M VOUT SHDNSHUTDOWN FB 10V 175m A
VC GND
CERAMIC
C1: AVX TAJA226M006R 1949 F01
C2: TAIYO YUDEN LMK325BJ106MN
D1: MBRM120LT3 LOAD CURRENT (m A)
L1: SUMIDA CDRH62B-100 1949 F02
Figure 1. 3.3V to 10V/175m A DC/DC Converter Figure 2. 3.3V to 10V Converter Efficiency
Page Summary Contents For LINEAR TECHNOLOGY LT1949 Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 8 |
| File Size | 160.10 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the typical shutdown current consumption?
The quiescent current in shutdown is 25µA, and operating current remains low at 4.5mA.
How does the LT1949 handle loop optimization?
It includes an external compensation pin that allows users flexibility to optimize the loop compensation circuit.
What packages are available for this converter?
The device is available in small 8-Lead MSOP and SO packages, suitable for low profile designs.
What voltage range does the converter support?
It accepts an input voltage (VIN) range of 1.7V to 12V and can provide output voltages up to 28V.