LINEAR TECHNOLOGY LT1949 User's Manual
Summary
This detailed technical manual covers the LT1949, a fixed-frequency PWM DC/DC Converter designed for generating stable bias voltages. Key features include high voltage switching up to 30V, low quiescent current operation, and an integrated low-battery detector for robust portable electronics. It is ideal for designers creating complex systems such as large screen LCD panels, diagnostic medical instruments, or specialized data logging equipment requiring reliable, efficient power solutions in miniature packages.
Page 1 Text Content
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 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 8 |
| File Size | 161.50 KB |
| Published | June 16, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
What is the operating temperature range for this device?
The LT1949ES8/LT1949IS8 models have an operating range of -40°C to 85°C.
Is the LT1949 compatible with other versions?
Yes, it is pin-for-pin compatible with the LT1317B and supports a 30V switch rating.
Does the converter have battery backup features?
The LT1949 includes a low-battery detector that remains active in shutdown to keep portable equipment running.
What is the typical input voltage for operation?
Typical application examples show operation from 3.3V or 3.6V, but the general input range can accommodate voltages up to 12V.