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MAX786, MAX786R, MAX786S

Dual-Output Power Supply Controller for Notebook Computers

Dual-Output 3.3V and 5V Notebook Power Supply Provide Up to 50W with >90% Efficiency

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Overview

Description

The MAX786 is a system-engineered power-supply controller for notebook computers or similar battery-powered equipment. It provides two high-performance step-down (buck) pulse-width modulators (PWMs) for +3.3V and +5V. Other features include dual, low-dropout, micropower linear regulators for CMOS/RTC back-up, and two precision low-battery-detection comparators.

High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle Mode™ operation at light loads. The MAX786 uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient responses are terrific, with a high 60kHz unity-gain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs.

Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads, and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and communicating computers. The MAX786 is a monolithic, BiCMOS IC available in fine-pitch, surface-mount SSOP packages.

MAX786, MAX786R, MAX786S: Typical Application Circuit

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Key Features

Dual PWM Buck Controllers (+3.3V and +5V)
Two Precision Comparators or Level Translators
95% Efficiency
420µA Quiescent Current, 70µA in Standby (linear regulators alive)
25µA Shutdown Current (+5V linear alive)
5.5V to 30V Input Range
Small SSOP Package
Fixed Output Voltages:
- 3.3V (standard)
- 3.45V (High-Speed Pentium®)
- 3.6V (PowerPC®)

Applications/Uses

Communication Systems
Notebook Computers
Pen-Entry Systems
Portable Data Terminals

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX786

5.5

3.3

Preset

Resistor

External

Yes

300

SSOP/28

$5.84 @1k

See All Step-Down Switching Regulators (402)

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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Quality and Environmental Data

Request Reliability Report for: MAX786 MAX786R MAX786S
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Environmental Management System >

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