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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 1.1MB) Download   E-Mail

Description

The MAX8732A/MAX8733A/MAX8734A dual step-down, switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX8732A/MAX8733A/MAX8734A include two pulse-width modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each linear regulator provides up to 100mA output current with automatic linear-regulator bootstrapping to the main SMPS outputs. The MAX8732A/MAX8733A/MAX8734A include on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown. Additionally, the outputs are high impedance when VCC falls below its UVLO set point while the outputs are enabled. Maxim's proprietary Quick-PWM™ quick-response, constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic pulse-skipping mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include pulse skipping, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications. The MAX8732A features a 200kHz/5V and 300kHz/3.3V SMPS for highest efficiency, while the MAX8733A features a 400kHz/5V and 500kHz/3.3V SMPS for "thin and light" applications. The MAX8734A provides a pin-selectable switching frequency, allowing either 200kHz/300kHz or 400kHz/500kHz operation of the 5V/3.3V SMPSs, respectively. The MAX8732A/MAX8733A/MAX8734A are available in 28-pin QSOP packages and operate over the extended temperature range (-40°C to +85°C). The MAX8732A/MAX8733A/MAX8734A are pin-for-pin upgrades to the MAX1777/MAX1977/MAX1999. The MAX1999 evaluation kit (EV kit) can be used to evaluate the MAX8732A/MAX8733A/MAX8734A.

Key Features		Applications/Uses
No Current-Sense Resistor Needed (MAX8734A) Accurate Current Sense with Current-Sense Resistor (MAX8732A/MAX8733A) 1.5% Output Voltage Accuracy 3.3V and 5V 100mA Bootstrapped Linear Regulators Internal Soft-Start and Soft-Stop Output Discharge Quick-PWM with 100ns Load Step Response 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™) 4.5V to 24V Input Voltage Range Enhanced Ultrasonic Pulse-Skipping Mode (25kHz min) Power-Good (PGOOD) Signal Overvoltage Protection Enable/Disable		3- and 4-Cell Li+ Battery-Powered Devices Notebook and Subnotebook Computers PDAs and Mobile Communication Devices

Diagram

Pin Configurations

Reliability Reports

Show FIT data for: MAX8732A MAX8733A MAX8734A Request Reliability Report for: MAX8732A MAX8733A MAX8734A

Software/Models

none

Ordering Information

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. More: SeeFull Data Sheet or Part 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.

Devices: 1-10 of 10

MAX8732A	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8732AEEI			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8732AEEI-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX8733A	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8733AEEI			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8733AEEI-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX8734A	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8734AEEI+T			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8734AEEI+			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8734AEEI+TG104			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8734AEEI+G104			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX8734AEEI			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8734AEEI-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet

More Information

New Product Press Release 2005-07-21

Related Products

MAX1777, MAX1977, MAX1999 High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook Computers

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