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Analog Devices MAX1771CSA+T — Analog & Data Acquisition

MAX1771CSA+T Boost/Buck-Boost Controller, 300kHz, 8-SOIC

MPNMAX1771CSA+T
End of Life

Maxim Integrated MAX1771CSA+T, current-mode PWM controller, boost/buck-boost topology, 300kHz switching, 92% max duty cycle, 3V to 16.5V supply, enable pin, 8-SOIC, 0°C to 70°C.

$6.04Ref. price · indicative, final on quote
Packaging8-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MAX1771CSA+T specifications
ParameterValue
Output typeTransistor Driver
MountingSurface Mount
Voltage - supply (Vcc (Vdd))3V ~ 16.5V
Frequency - switching300kHz
I/O channels1
Output phases1
Duty cycle92%
Operating temperature0°C ~ 70°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionStep-Up, Step-Up/Step-Down
TopologyBoost, Buck-Boost
Clock syncNo
Case8-SOIC (0.154\", 3.90mm Width)
Control featuresEnable
Output configurationPositive
Synchronous rectifierNo

Product details

Boost/buck-boost controller for non-isolated rails

The MAX1771CSA+T is a current-mode PWM controller that supports boost and buck-boost topologies from a single 3V to 16.5V supply rail — a fit for generating 5V, 12V, or adjustable outputs from a battery or regulated bus. Switching at a fixed 300 kHz, the controller drives an external N-channel MOSFET and sets the inductor value and output filter corner — no external clock sync, so the switching noise spectrum is predictable. The 92% maximum duty cycle limits the achievable step-up ratio in boost mode; for a 3V input, the theoretical output ceiling is about 37.5V before the duty cycle saturates.

RoHS3 compliant (2015/863/EU), with no exemptions that would restrict EU or UKCA market access.

Frequently asked questions

What is the switching frequency of MAX1771CSA+T?

The switching frequency is fixed at 300 kHz. There is no clock synchronization input, so the controller free-runs at this frequency.

Does MAX1771CSA+T have an enable pin for shutdown control?

Yes, the control features include an Enable pin, allowing the controller to be shut down for power sequencing or low-power standby.

What is the maximum duty cycle of MAX1771CSA+T?

The maximum duty cycle is 92%. This sets the upper limit on the step-up ratio in boost mode — for a given input voltage, the output cannot exceed approximately V_in / (1 - 0.92).