MAX8581, MAX8582 2.5MHz/1.5MHz Step-Down Converters with 60m Bypass in TDFN for CDMA PA Power

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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 60m

(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).

Key Features

Applications/Uses

600mA Step-Down Converter
60m (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

	WCDMA/NCDMA Cell Phones
	Wireless PDAs, Smartphones

Key Specifications: Step-Down Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

I_OUT (A)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX8581

2.7

5.5

0.6

Dyn. REF In
Resistor

2500

•	Adjustable Frequency

•	Current Limit

•	Fixed Frequency/ PWM Operation

•	Internal Power Switches

•

Shutdown

•	Soft Start

•	Synchronous Rectifier

•	Voltage or PWM Controllable Output

Yes

THIN QFN (Dual)/10

Yes

-40 to +85

$1.57 @ 1k

MAX8582

1500

$1.57 @ 1k

See All Step-Down Switching Regulators (223)

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Operating Freq. (kHz)

Internal Power Switch(es)

Package

Price^**

MAX8581

Step-Down

2.7

5.5

0.6

2500

Yes

THIN QFN (Dual)/10

$1.57 @ 1k

MAX8582

1500

$1.57 @ 1k

See All Switch-Mode DC-DC Power Supplies (429)

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.