Maxim > Products > Power and Battery Management > MAX1771

MAX1771

12V or Adjustable, High-Efficiency, Low I_Q, Step-Up DC-DC Controller

High-Efficiency Even at Low Input Voltages and Noise Reduction

Overview

Status

Part Number	Status
MAX1771	Active: In Production. But some versions of the family are Not Recommended for New Designs. See Ordering Information.

Description

The MAX1771 step-up switching controller provides 90% efficiency over a 30mA to 2A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives this device the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters).

This controller uses miniature external components. Its high switching frequency (up to 300kHz) allows surface-mount magnetics of 5mm height and 9mm diameter. It accepts input voltages from 2V to 16.5V. The output voltage is preset at 12V, or can be adjusted using two resistors.

The MAX1771 optimizes efficiency at low input voltages and reduces noise by using a single 100mV current-limit threshold under all load conditions. A family of similar devices, the MAX770-MAX773, trades some full-load efficiency for greater current-limit accuracy; they provide a 200mV current limit at full load, and switch to 100mV for light loads.

The MAX1771 drives an external N-channel MOSFET switch, allowing it to power loads up to 24W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs. An evaluation kit is available.

Data Sheet

Download	Rev 2	(PDF, 1.5MB)
Email

An evaluation kit is available: MAX1771EVKIT

Key Features

90% Efficiency for 30mA to 2A Load Currents
Up to 24W Output Power
110µA (max) Supply Current
5µA (max) Shutdown Current
2V to 16.5V Input Range
Preset 12V or Adjustable Output Voltage
Current-Limited PFM Control Scheme
Up to 300kHz Switching Frequency
Evaluation Kit Available

Applications/Uses

Battery-Powered Applications
Flash Memory Programming
High-Power RF Power-Amplifier Supply
Palmtops/Handheld Terminals
Portable Communicators
Positive LCD-Bias Generators

Key Specifications:

Step-Up Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Preset V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Oper. Freq.
(kHz)

Budgetary
Price

min

max

min

max

≥

≤

See Notes

MAX1771

16.5

100

Preset

Resistor

300

$1.91 @1k

See All Step-Up Switching Regulators (96)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Notes and Comments

Output voltages limited by external components. APD bias generator

Didn't Find What You Need?

Information Index

Overview		Design Resources		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Technical Documents Evaluation Kits Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-0263 Rev 2; 2002-06-20
This page last modified: 2012-07-25

12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller