LINEAR TECHNOLOGY LTC1530 User's Manual
Summary
This comprehensive guide details the LTC1530, a high-power synchronous switching regulator controller designed for mission-critical power applications. Ideal for engineers developing industrial and commercial hardware that requires reliable, efficient voltage conversion from 5V or 3.3V down to 1.3V–3.5V. The manual covers key features like top-side FET sensing (eliminating external resistors), adjustable current limiting, and over 95% peak efficiency. It provides deep technical specifications necessary for integrating stable, high-performance power solutions into microprocessors and embedded systems.
Page 1 Text Content
LTC1530
High Power Synchronous Switching Regulator Controller
FEATURES DESCRIPTIO High Power Buck Converter from 5V or 3.3V Input The LTC®1530 is a high power synchronous switching Adjustable Current Limit in S0-8 with regulator controller optimized for 5V to 1.3V-3.5V output Topside FET RDS(ON) Sensing applications. Its synchronous switching architecture drives No External Sense Resistor Required two external N-channel MOSFET devices to provide high Hiccup Mode Current Limit Protection efficiency. The LTC1530 contains a precision trimmed Adjustable, Fixed 1.9V, 2.5V, 2.8V and 3.3V Output reference and feedback system that provides worst-case All N-Channel MOSFET Synchronous Driver output voltage regulation of ±2% over temperature, load Excellent Output Regulation: ±2% over Line, Load current and line voltage shifts. Current limit circuitry and Temperature Variations senses the output current through the on-resistance of High Efficiency: Over 95% Possible the topside N-channel MOSFET, providing an adjustable Fast Transient Response current limit without requiring an external low value sense Fixed 300k Hz Frequency Operation resistor. Internal Soft-Start Circuit
The LTC1530 includes a fixed frequency PWM oscillator
Quiescent Current: 1m A; 45µA in Shutdown
that free runs at 300k Hz, providing greater than 90% efficiency in converter designs from 1A to 20A of output APPLICATIO S current. Shutdown mode drops the LTC1530 supply cur-
EF FI CI EN CY
rent to 45µA.
Power Supply for Pentium® II, AMD-K6®-2, SPARC,
The LTC1530 is specified for commercial and industrial
ALPHA and PA-RISC Microprocessors
temperature ranges and is available in the S0-8 package.
High Power 5V to 1.3V-3.5V Regulators
, LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corp. AMD-K6 is a registered trademark of Advanced Micro Devices, Inc.
TYPICAL APPLICATIO
Efficiency vs Load Current
VIN 5V
MBR0530T1 MBR0530T1
0.1µF CIN1200µF
PVCC L1
IMAX G1 Q1
2µH VOUT
COMP IFB 3.3V
COUT 14A
150p F LTC1530-3.3
GND VOUT
CIN: SANYO 10MV1200GX TA = 25°C
COUT: AVX TPSE337M006R0100 L1: COILTRONICS CTX02-13198
OR PANASONIC ETQP6F2R5HA 0.3 LOAD CURRENT (A)
Q1, Q2: SILICONIX SUD50N03-10
Figure 1. Single 5V to 3.3V Supply
1530fa
Page Summary Contents For LINEAR TECHNOLOGY LTC1530 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 301.36 KB |
| Published | June 06, 2026 |
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Frequently Asked Questions
Is an external sense resistor required for current sensing?
No external sense resistor is required; it uses top-side FET sensing through the MOSFET on-resistance.
What protection features are built into the LTC1530?
It provides adjustable current limit and Hiccup Mode Current Limit Protection.
How does the device maintain high efficiency?
It achieves over 95% efficiency by using top-side N-channel MOSFET sensing technology.
What voltage options are available for the fixed output reference?
The chip offers precision trimmed, adjustable reference voltages of 1.9V, 2.5V, 2.8V, and 3.3V.