SEPIC and Inverting Controller - Analog Devices
Description
LT3757/LT3757A
Boost, Flyback, SEPIC and Inverting Controller
FEATURES
n Wide Input Voltage Range: 2.
9V to 40V n Positive or Negative Output Voltage Programming
with a Single Feedback Pin n Current Mode Control Provides Excellent Transient
Response n Programmable Operating Frequency (100kHz to
1MHz) with One External Resistor n Synchronizable to an External Clock n Low Shutdown Current < 1µA n Internal 7.
2V Low Dropout Voltage Regulator n Programmable Input Undervoltage Lockout with
Hysteresis n Programmable Soft-Start n Small 10-Lead DFN (3mm × 3mm) and Thermally
Enhanced 10-Pin MSOP Packages n AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
n Automotive and Industrial Boost, Flyback, SEPIC and Inverting Converters
n Telecom Power Supplies n Portable Electronic Equipment
DESCRIPTION
The LT®3757/LT3757A are wide input range, current mode, DC/DC controllers which are capable of generating either positive or negative output voltages.
They can be configured as either a boost, flyback, SEPIC or inverting converter.
The LT3757/LT3757A drive a low side external N-channel power MOSFET from an internal regulated 7.
2V supply.
The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.
The operating frequency of LT3757/LT3757A can be set with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin.
A low minimum operating supply voltage of 2.
9V, and a low shutdown quiescent current of less than 1µA, make the LT3757/LT3757A ideally suited for batteryoperated systems.
The LT3757/LT3757A feature soft-start and frequency foldback functions to limit inductor current during startup and output short-circuit.
The LT3757A has improved load transient performance compared to the LT3757.
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TYPICAL APPLICATION
High Efficiency Boost Converter
VIN 8V TO 16V
10µF
25V 200...
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