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MAX1927

Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters

Please check latest availability status for a specific part variant.

Overview

Description

The MAX1927/MAX1928 800mA step-down converters power low-voltage microprocessors in compact equipment requiring the highest possible efficiency. The MAX1927/MAX1928 are optimized for generating low output voltages (down to 750mV) at high efficiency using small external components. The supply voltage range is from 2.6V to 5.5V and the guaranteed minimum output current is 800mA. 1MHz pulse-width modulation (PWM) switching allows for small external components. A unique control scheme minimizes ripple at light loads, while maintaining a low 140µA quiescent current.

The MAX1927/MAX1928 include a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external component count. No external diode is needed. 100% duty-cycle operation allows for a dropout voltage of only 340mV at 800mA. Other features include internal soft-start, power-OK (POK) output, and selectable forced PWM operation for lower noise at all load currents.

The MAX1928 is available with several preset output voltages: 1.5V (MAX1928-15), 1.8V (MAX1928-18), and 2.5V (MAX1928-25). The MAX1927R has adjustable output range down to 0.75V. The MAX1927/MAX1928 are available in a tiny 10-pin µMAX package.

MAX1927, MAX1928: Typical Operating Circuit

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Key Features

800mA Output Current

Output Voltages from 0.75V to 5V

2.6V to 5.5V Input Voltage Range

Power-OK Output

No Schottky Diode Required

Selectable Forced PWM Operation

1MHz Fixed-Frequency PWM Operation

140µA Quiescent Current

Soft-Start

10-Pin µMAX Package

Applications/Uses

Battery-Powered Equipment
DSP Core Power
PDAs and Palmtops
WCDMA Handsets

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

Power Good Signal

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX1927

2.6

5.5

0.75

Resistor

0.8

Internal

Yes

1000

UMAX/10

$1.82 @1k

MAX1928

1.5

2.5

1.5

1.8

2.5

Preset

UMAX/10

$1.60 @1k

See All Step-Down Switching Regulators (380)

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

MAX1927EVKIT: Evaluation Kit for the MAX1927, MAX1928
MAX1928EVKIT: Evaluation Kit for the MAX1927, MAX1928

Quality and Environmental Data

Product Reliability Reports: MAX1927.pdf
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

MAX1927REUB+

MAX1927REUB+T

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.

Quality Management System >
Environmental Management System >

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