Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX1630A–MAX1635A are buck-topology, stepdown, switch-mode, power-supply controllers that generate logic-supply voltages in battery-powered systems. These high-performance, dual-/triple-output devices include on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low-dropout circuitry, internal frequency-compensation networks, and automatic bootstrapping.

Up to 96% efficiency is achieved through synchronous rectification and Maxim's proprietary Idle Mode™ control scheme. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Strong 1A on-board gate drivers ensure fast external n-channel MOSFET switching.

These devices feature a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile communications and pen-entry applications. Asserting the Active-Low SKIP pin enables fixed-frequency mode for lowest noise under all load conditions.

The MAX1630A–MAX1635A include two PWM regulators, adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V modes. All these devices include secondary feedback regulation, and the MAX1630A/MAX1632A/MAX1633A/MAX1635A each contain 12V/120mA linear regulators. The MAX1631A/MAX1634A include a secondary feedback input (SECFB), plus a control pin (STEER) that selects which PWM (3.3V or 5V) receives the secondary feedback signal. SECFB provides a method for adjusting the secondary winding voltage regulation point with an external resistor-divider, and is intended to aid in creating auxiliary voltages other than fixed 12V.

The MAX1630A/MAX1631A/MAX1632A contain internal output overvoltage and undervoltage protection features. The MAX1630A family has improved RF immunity over the MAX1630 family.

Data Sheet

Download	Rev 1	(PDF, 288kB)
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Key Features

96% Efficiency
+4.2V to +30V Input Range
2.5V to 5.5V Dual Adjustable Outputs
Selectable 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
12V Linear Regulator
Adjustable Secondary Feedback (MAX1631A/MAX1634A)
5V/50mA Linear Regulator Output
Precision 2.5V Reference Output
Programmable Power-Up Sequencing
Power-Good (Active-Low RESET) Output
Output Overvoltage Protection (MAX1630A/MAX1631A/MAX1632A)
Output Undervoltage Shutdown (MAX1630A/MAX1631A/MAX1632A)
200kHz/300kHz Low-Noise, Fixed-Frequency Operation
Low-Dropout, 99% Duty-Factor Operation
2.5mW Typical Quiescent Power (+12V Input, Both SMPSs On)
4µA Typical Shutdown Current
28-Pin SSOP Package

Applications/Uses

Desktop CPU Local DC-DC Converters
Notebook and Subnotebook Computers
PDAs and Mobile Communicators

Diagram

Functional Diagram

Reliability Reports

Reliability Report:	MAX1631A.pdf MAX1634A.pdf
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Ordering Information

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Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1631AEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1631AEAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1631AEAI+T			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1631AEAI-T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1632AEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1632AEAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1632AEAI+T			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1632AEAI-T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1633AEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1633AEAI-T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1634AEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1634AEAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1634AEAI+T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1634AEAI-T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Products with Similar Part Numbers

MAX1630EVKIT, MAX1631EVKIT, ...	Evaluation Kit for the MAX1630, MAX1631, MAX1632
MAX1630, MAX1631, MAX1632, ...	Multi Output, Low-Noise Power Supply Controllers for Notebook Computers

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Information Index

Document Ref.: 19-3518 Rev 1; 2005-09-16
This page last modified: 2009-12-11