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MAX1572

800mA, 2MHz, PWM DC-to-DC Step-Down Converter with Reset

800mA, Sub-1V, 2MHz, PWM, Step-Down DC-DC Uses Tiny 2.2µH Inductor, Includes Reset Output

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX1572 is a fixed-frequency, synchronous step-down DC-to-DC converter to power low-voltage microprocessor/DSP cores in portable equipment requiring high efficiency in a limited PC board area. The features are optimized for high efficiency over a wide load range, small external component size, low output ripple, and excellent transient response. The input supply voltage range is from 2.6V to 5.5V, while the output is internally fixed from 0.75V to 2.5V in 50mV increments with a guaranteed output current of 800mA. The high 2MHz switching allows tiny low-cost capacitors and a low-profile inductor, while the power-saving pulse-group mode reduces quiescent current to 48µA (typ) with light loads. To reduce noise and RF interference, the converter can be configured to provide forced-PWM operation.

The MAX1572 includes a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external component count. No external diode is needed. Other features include soft-start to eliminate inrush current at startup and a 170ms (min) RESET-bar output to provide power-on/undervoltage reset. The MAX1572 is available in a 12-pin, 4mm x 4mm thin QFN package with exposed paddle.

Data Sheet

Download	Rev 1	(PDF, 384kB)
E-Mail

An evaluation kit is available: MAX1572EVKIT

Key Features

Up to 97% Efficiency
2MHz PWM Switching
800mA Guaranteed Output Current
Low 48µA Quiescent Current
Power-Saving Modes: Pulse-Group, Pulse-Skip, Forced-PWM Mode
0.75V to 2.5V Preset Output Range (in 50mV Increments)
Voltage-Positioning Load Transients
5mV_P-P Output Ripple
Tiny 2.2µH Inductor
10µF Ceramic Output Capacitor
Low 0.1µA Shutdown Current
No External Schottky Diode Required
Soft-Start with Zero Inrush Current
170ms (min) active-low RESET Output
Small 12-Pin, 4mm x 4mm Thin QFN Package

Applications/Uses

Cell Phones/Smartphones
Digital Cameras and Camcorders
Handheld Instruments (PDAs, Palmtops)
MP3 and DVD Players
PCMCIA Cards
PDAs, Palmtops, and Notebook Computers

Key Specifications:

Step-Down Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

≥

≤

max w/pins

See Notes

MAX1572

2.6

5.5

0.75

2.5

0.8

Digital/VID

2000

TQFN/12

16.8

$1.96 @1k

See All Step-Down Switching Regulators (284)

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

Product Guides

Signal Chain (PDF)

Reliability Reports

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Software/Models

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Ordering Information

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Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1572ETC130			Active	TQFN;12 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1572ETC130+			Active	TQFN;12 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1572ETC130+T			Active	QFN; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1572ETC130-T			Active	QFN;12 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1572ETC150			Active	TQFN;12 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1572ETC150-T			Active	QFN;12 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1572ETC180			Active	TQFN;12 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1572ETC180+			Active	TQFN;12 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1572ETC180+T			Active	QFN; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1572ETC180-T			Active	QFN;12 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
MAX1572ETC250			Active	TQFN;12 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1572ETC250+			Active	TQFN;12 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1572ETC250+T			Active	QFN; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1572ETC250-T			Active	QFN;12 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.

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Evaluation Kits

MAX1572EVKIT

Evaluation Kit for the MAX1572

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