LINEAR TECHNOLOGY LT1339 User's Manual
Summary
This professional controller IC is engineered for high-power synchronous DC/DC conversion up to 60V. It provides robust control over dual N-channel MOSFETs, featuring advanced protection such as programmable average current limiting, undervoltage lockout, and soft start sequencing. Designed for complex power systems, the device offers precise, stable outputs needed in data center, telecommunications, industrial, and automotive applications requiring high efficiency and reliable operation across wide input variations.
Page 1 Text Content
LT1339
High Power Synchronous DC/DC Controller FEATURES DESCRIPTION
High Voltage: Operation Up to 60V The LT®1339 is a high power synchronous current mode High Current: Dual N-Channel Synchronous Drive switching regulator controller. The IC drives dual
Handles Up to 10,000p F Gate Capacitance N-channel MOSFETs to create a single IC solution for high Programmable Average Load Current Limiting power DC/DC converters in applications up to 60V.
5V Reference Output with 10m A External
The LT1339 incorporates programmable average current
Loading Capability
limiting, allowing accurate limiting of DC load current
Programmable Fixed Frequency Synchronizable
independent of inductor ripple current. The IC also incor-
Current Mode Operation Up to 150k Hz
porates user-adjustable slope compensation for minimi-
Undervoltage Lockout with Hysteresis
zation of magnetics at duty cycles up to 90%.
Programmable Start Inhibit for Power Supply
Sequencing and Protection The LT1339 timing oscillator operating frequency is pro- Adaptive Nonoverlapping Gate Drive Prevents grammable and can be synchronized up to 150k Hz. Mini- Shoot-Through mum off-time operation provides main switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions.
APPLICATIONS
An output phase reversal pin allows flexibility in configu-
48V Telecom Power Supplies
ration of converter types, including inverting and negative
Personal Computers and Peripherals
topologies.
Distributed Power Converters Industrial Control Systems
EF FI CI EN CY
Lead-Acid Battery Backup Systems
Automotive and Heavy Equipment , LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
28V to 5V 20A Buck Converter
VIN 28V to 5V Efficiency
IN5819
SYNC VBOOST 12V CIN +C12VIN
+CBST 1500µF
5VREF 1µF
TG IRL3803
C5VREF MBR0520
CT TS
CCT CAVG SL/ADJ 12VIN
2200p F 2200p F IRL3103D2
LT1339 BG
IAVG D2 L1 MBR0520 10µH
CSS, 1µF PGND
RVC, 10k PHASE
CVC, 1n F 100k
VC RUN/SHDN
SGND SENSE+
0.1µF OUTPUT CURRENT (A)
VOUT 1339 TA03a
VREF SENSE–
5V AT 20A COUT RFB2 RFB1 2200µF 1k 3k 6.3V
L1 = CTX02-13400-X2 × 2
1339 TA03
sn1339 1339fas
Page Summary Contents For LINEAR TECHNOLOGY LT1339 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 288.33 KB |
| Published | June 22, 2026 |
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Frequently Asked Questions
What are the operating voltage limits for the LT1339?
The unit supports high voltage operation up to 60V and handles inputs from -0.3V to 60V.
Does the LT1339 offer current limiting features?
Yes, it incorporates programmable average load current limiting capability for accurate DC load current regulation.
What functions are available for improving power supply reliability?
It includes Undervoltage Lockout (UVLO) with Hysteresis and a Soft Start feature gated by UVLO conditions.
What kind of applications is the LT1339 suitable for?
Applications include Telecom Power Supplies, Personal Computers, Industrial Control Systems, and Automotive/Heavy Equipment usage.