LINEAR Low Input Voltage, High Power Synchronous Buck DC-DC Controller User's Manual
Summary
The LTC3713 is a high-efficiency synchronous buck DC/DC controller engineered for advanced power management in space-constrained applications, such as telecom or portable devices. This versatile regulator excels at high current efficiency while supporting extremely low input voltages as little as 1.5V, eliminating the need for a sense resistor. The associated manual provides comprehensive technical documentation, covering detailed electrical characteristics, operational parameters, and application guidelines required for reliable integration into demanding point-of-load power circuits.
Page 1 Text Content
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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 Low Input Voltage, High Power Synchronous Buck DC-DC Controller User's Manual
Manual Details
| Brand | High Power |
|---|---|
| Pages | 24 |
| File Size | 309.50 KB |
| Published | May 28, 2026 |
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Frequently Asked Questions
What are the minimum input voltage requirements for the LTC3713?
It operates from auxiliary supplies as low as 1.5V, and its regulated output can handle inputs from 0.8V up to 0.9V.
Does this DC/DC controller require a sense resistor?
No, the device is designed without requiring an external sense resistor (No R).
What operational protection features are built into the chip?
It includes internal foldback current limit, Output Overvoltage Protection, and optional Short-Circuit Shutdown.
How can I adjust the operating frequency of the controller?
The running operating frequency is adjusted by selecting an external resistor.