LINEAR TECHNOLOGY LTC3713 User Guide
Summary
This manual provides detailed technical specifications for the LTC3713, a high-efficiency synchronous buck switching regulator controller. The product is engineered for low-voltage power systems, featuring operation from as low as 1.5V and eliminating the need for external sense resistors. It includes advanced protections like programmable soft-start and overvoltage monitoring. This resource is essential for electrical engineers designing compact, reliable power management solutions, particularly in demanding applications such as telecommunications equipment that require stable step-down voltage regulation.
Page 1 Text Content
LTC3713
Low Input Voltage,
High Power, No RSENSE
Synchronous Buck DC/DC Controller
FEATURES DESCRIPTIO
Very Low VIN(MIN): 1.5V The LTC®3713 is a high current, high efficiency synchro- True Current Mode Control nous buck switching regulator controller optimized for 5V Drive for N-Channel MOSFETs Eliminates use with very low input supply voltages. It operates from Auxillary 5V Supply inputs as low as 1.5V and provides a regulated output No Sense Resistor Required voltage from 0.8V up to (0.9)VIN. The controller uses Uses Standard 5V Logic-Level N-Channel MOSFETs a valley current control architecture to enable high operat- Adjustable Current Limit ing frequencies without requiring a sense resistor. Adjustable Frequency Operating frequency is selected by an external resistor and Switch t ON(MIN) < 100ns is compensated for variations in VIN and VOUT. The LTC3713 2% to 90% Duty Cycle at 200k Hz uses a pair of standard 5V logic-level N-channel external 0.8V ±1% Reference MOSFETs, eliminating the need for expensive P-channel Power Good Output Voltage Monitor or low threshold devices.
Programmable Soft-Start
Discontinuous mode operation provides high efficiency
Output Overvoltage Protection
operation at light loads. A forced continuous control
Optional Short-Circuit Shutdown Timer
pin reduces noise and RF interference, and can assist
Small 24-Lead SSOP Package
secondary winding regulation by disabling discontinuous
EF FI CI EN CY operation when the main output is lightly loaded. Fault
APPLICATIO S
protection is provided by internal foldback current limit- Telecom Card 3.3V, 2.5V, 1.8V Step-Down ing, an output overvoltage comparator and an optional Bus Termination (DDR memory, SSTL) short-circuit shutdown timer.
Synchronous Buck with General Purpose Boost
, LTC and LT are registered trademarks of Linear Technology Corporation. Low VIN Synchronous Boost No RSENSE is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN 1.8V TO 3.3V
CMDSH-3
22µF SHDN BOOST ×2 Efficiency vs Load Current
5.6k VIN = 2.5V
ION TG M1 L1
LTC3713 1.8µH VOUT
VFB1 SW1 1.25V COUT 10A
SENSE+
680p F BG M2 ×2
ITH PGND
SENSE–
RUN/SS INTVCC
0.1µF PGOOD VIN1
SGND VIN2
COUT: PANASONIC EEFUEOD271R 4.7µHMBR0520 0.01
L1: (A) PANASONIC ETQP6FIR8BFA 0.04 0.10 0.40
(B) TOKO D104C-1.8µH LOAD CURRENT (A)
VFB2 SW2 M1, M2: (A) IRF7822, (B) IRF7811A
Figure 1. High Efficiency Step-Down Converter from 1.8V to 3.3V Input
3713fa
Page Summary Contents For LINEAR TECHNOLOGY LTC3713 User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 280.49 KB |
| Published | June 01, 2026 |
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Frequently Asked Questions
What low voltage input levels can the LTC3713 operate from?
It operates with auxiliary supplies as low as 1.5V, even when needing to power N-Channel MOSFETs.
Does using an external sense resistor eliminate the need for a sense resistor?
No, the controller is designed to operate without requiring an external sense resistor (No R).
How can I adjust the operating frequency of the device?
The operating frequency is selected and controlled by integrating an external resistor into the circuit design.
What protective features does this DC/DC controller include?
It offers internal fault protection, including foldback current limit, output overvoltage protection, and short-circuit shutdown.