MAX8506, MAX8507, MAX8508 PWM Step-Down DC-DC Converters with 75m Bypass FET for WCDMA and cdmaOne Handsets

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The MAX8506/MAX8507/MAX8508 integrate a PWM step-down DC-DC regulator and a 75mΩ (typ) bypass FET to power the PA in WCDMA and cdmaOne™ cell phones. The supply voltage range is from 2.6V to 5.5V, and the guaranteed output current is 600mA. One megahertz PWM switching allows for small external components.

The MAX8506 and MAX8507 are dynamically controlled to provide varying output voltages from 0.4V to 3.4V. The MAX8508 is externally programmed for fixed 0.75V to 3.4V output. Digital logic enables a high-power (HP) bypass mode that connects the output directly to the battery for all versions. The MAX8506/MAX8507/MAX8508 are designed so the output settles in less than 30µs for a full-scale change in output voltage and load current.

The MAX8506/MAX8507/MAX8508 are offered in 16-pin 4mm x 4mm thin QFN packages (0.8mm max height).

Key Features

Applications/Uses

Integrated 75mΩ (typ) Bypass FET
38mV Dropout at 600mA Load
Up to 94% Efficiency
Dynamically Adjustable Output from 0.4V to 3.4V (MAX8506, MAX8507)
Externally Fixed Output from 0.75V to 3.4V (MAX8508)
1MHz Fixed-Frequency PWM Switching
600mA Guaranteed Output Current
Shutdown Mode 0.1µA (typ)
16-Pin Thin QFN (4mm x 4mm, 0.8mm max Height)

	WCDMA/NCDMA Cell Phones
	Wireless Modems
	Wireless PDAs, Palmtops, and Notebook Computers

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^**

MAX8506

2.6

5.5

0.4

3.5

0.6

Dyn. REF In
Resistor

0.25

1000

•	Adjustable Frequency

•	Current Limit

•	Fixed Frequency/ PWM Operation

•	Internal Power Switches

•

Shutdown

•	Synchronous Rectifier

•	Voltage or PWM Controllable Output

Yes

THIN QFN/16

Yes

-40 to +85

$2.05 @ 1k

MAX8507

0.4

Dyn. REF In
Resistor

•	Adjustable Frequency

•	Current Limit

•	Fixed Frequency/ PWM Operation

•	Internal Power Switches

•

Shutdown

•	Synchronous Rectifier

•	Voltage or PWM Controllable Output

$2.05 @ 1k

MAX8508

0.75

Resistor

•	Adjustable Frequency

•	Current Limit

•	Fixed Frequency/ PWM Operation

•	Internal Power Switches

•

Shutdown

•	Synchronous Rectifier

$2.05 @ 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^**

MAX8506

Step-Down

2.6

5.5

0.4

3.5

0.6

0.25

1000

Yes

THIN QFN/16

$2.05 @ 1k

MAX8507

0.4

$2.05 @ 1k

MAX8508

0.75

$2.05 @ 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.