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MAX8581, MAX8582

2.5MHz/1.5MHz Step-Down Converters with 60mΩ Bypass in TDFN for CDMA PA Power

Overall Smallest Solution 1.5MHz Step-Down DC-DC Converters Deliver 600mA with Up to 94% Efficiency in a Small TDFN Package

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX8581/MAX8582 high-frequency step-down converters are optimized for dynamically powering the power amplifier (PA) in CDMA handsets. They integrate a high-efficiency PWM step-down converter for medium- and low-power transmission and a 60mΩ (typ) bypass mode to power the PA directly from the battery during high-power transmission. They use an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. The MAX8581/MAX8582 use an internal feedback network, and the switching frequency is internally set to 2.5MHz and 1.5MHz, respectively.

Fast switching (up to 2.5MHz) and fast soft-start allowthe use of ceramic 2.2µF input and output capacitors while maintaining low voltage ripple. The small 1.5µH to 3.3µH inductor size can be optimized for efficiency.

The MAX8581/MAX8582 are available in 10-pin, 3mm x3mm TDFN packages (0.8mm max height).

Data Sheet

Download	Rev 1	(PDF, 564kB)
E-Mail

An evaluation kit is available: MAX8582EVKIT

Key Features

600mA Step-Down Converter
60mΩ (typ) Bypass Mode with Integrated FET
Dynamically Adjustable Output from 0.4V to V_IN
2.5MHz and 1.5MHz Switching Frequency
Small LC Components: 1.5µH to 3.3µH and 2.2µF
Up to 94% Efficiency
Low Output Ripple at All Loads
2.7V to 5.5V Input
0.1µA Shutdown Mode
Output Short-Circuit Protection
Thermal Shutdown
10-Pin, 3mm x 3mm TDFN Packages

Applications/Uses

WCDMA/NCDMA Cell Phones
Wireless PDAs, Smartphones

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

MAX8581

2.7

5.5

0.6

Dyn. REF In

2500

TDFN-EP/10

9.6

$1.68 @1k

MAX8582

1500

TDFN-EP/10

$1.68 @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

Communications (PDF)

Reliability Reports

Reliability Report:	MAX8581.pdf
Show FIT data for:
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Software/Models

none

Ordering Information

Filters:

Part Number:

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
MAX8581ETB+			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8581ETB+T			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8582ETB+T			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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

MAX8582EVKIT

MAX8582 Evaluation Kit

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