LINEAR TECHNOLOGY LT3150 Data Sheet
Summary
This advanced linear regulator controller provides fast transient response and ultra-low dropout voltage, optimizing power delivery for sensitive electronics. It features an integrated fixed frequency boost converter and LDO output sequencing control, allowing precise management of multiple power rails. Optimized with high-side current limit protection and configurable shutdown pins, this device is essential for engineers designing microprocessor, ASIC, or complex I/O supply systems needing highly stable, low-voltage power conversion.
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LT3150
Fast Transient Response,
Low Input Voltage, Very Low Dropout
Linear Regulator Controller
FEATURES DESCRIPTIO Fast Transient Response Optimized with The LT®3150 drives a low cost external N-channel MOSFET Ceramic Output Capacitors as a source follower to produce a fast transient response, FET RDS(ON) Defines Dropout Voltage very low dropout voltage linear regulator. Selection of the ±1% Reference Tolerance Over Temperature N-channel MOSFET RDS(ON) allows dropout voltages below Multifunction LDO Shutdown Pin with Latchoff 300m V for low VIN to low VOUT applications. Fixed Frequency 1.4MHz Boost Converter Generates
The LT3150 includes a fixed frequency boost regulator
MOSFET Gate Drive
that generates gate drive for the N-channel MOSFET. The
Internally Compensated Boost Converter Uses Tiny
internally compensated current mode PWM architecture
Capacitors and Inductor
combined with the 1.4MHz switching frequency permits
Independent Boost Converter Shutdown Control
the use of tiny, low cost capacitors and inductors.
Permits LDO Output Voltage Supply Sequencing
16-Lead SSOP Package The LT3150’s transient load performance is optimized with ceramic output capacitors. A precision 1.21V refer- ence accommodates low voltage supplies.
APPLICATIO S
Protection includes a high side current limit amplifier that
Microprocessor, ASIC and I/O Supplies activates a fault timer circuit. A multifunction shutdown Very Low Dropout Input-to-Output Conversion pin provides either current limit time-out with latchoff, Logic Termination Supplies overvoltage protection or thermal shutdown. Independent , LTC and LT are registered trademarks of Linear Technology Corporation. shutdown control of the boost converter provides on/off
and sequencing control of the LDO output voltage.
TYPICAL APPLICATIO 1.8V to 1.5V, 4A Very Low Dropout Linear Regulator
Transient Response for
(Typical Dropout Voltage = 65m V at IOUT = 4A)
0.1A to 4A Output Load Step
MBR0520L
LT3150 10µH
4.7µF 50m V/DIV
VIN2 SW FB1 VIN1
1.37k SHDN2 SHDN1
1% VIN
SWGND IPOS
CIN 1.8V
GND INEG 5.1Ω
Si4410 2A/DIV
GND GATE 2.5V
COMP 243Ω 4A
X5R CERAMIC 3150 TA02
6800p F 50p F 1020Ω 0805 CASE 20µs/DIV
CIN: PANASONIC SP SERIES EEFUE0E221R 20% C1: AVX TAJA475M020R 20V 20%
3150 TA01
L1: MURATA LQH32CN100K11 OR SUMIDA CDRH3D16100
Page Summary Contents For LINEAR TECHNOLOGY LT3150 Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 253.86 KB |
| Published | June 06, 2026 |
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Frequently Asked Questions
What is the typical dropout voltage under heavy load?
The liquid regulator has a typical dropout voltage of 65mV when operating at 4A.
How can I control startup and shutdown sequencing?
It features independent boost converter shutdown control, allowing on/off and sequencing control of the LDO output voltage.
What are the specified ambient temperature limits?
The recommended operating ambient temperature range is from 0°C to 70°C.
Is this regulator suitable for low-voltage supplies?
Yes, it accommodates low voltage supplies with a precision 1.21V reference and requires a minimum operating voltage of 0.9V.