MAX8621Y, MAX8621Z Dual Step-Down DC-DC Power-Management ICs for Portable Devices

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The MAX8621Y/MAX8621Z power-management integrated circuits (PMICs) are designed for a variety of portable devices including cellular handsets. These PMICs include two high-efficiency step-down DC-DC converters, four low-dropout linear regulators (LDOs) with pin-programmable capability, one open-drain driver, a 60ms (typ) reset timer, and power-on/off control logic. These devices offer high efficiency with a no-load supply current of 160µA, and their small thin QFN 4mm x 4mm package makes them ideal for portable devices.

The step-down DC-DC converters utilize a proprietary 4MHz hysteretic-PWM control scheme that allows for ultra-small external components. Internal synchronous rectification improves efficiency and eliminates the external Schottky diode that is required in conventional step-down converters. The output voltage is adjustable from 0.6V to 3.3V. The output current is guaranteed up to 500mA.

The four LDOs offer low 45µV_RMS output noise and low dropout of only 100mV at 100mA. OUT1 and OUT2 deliver 300mA (min) of continuous output current. OUT3 and OUT4 deliver 150mA (min) of continuous output current. The output voltages are pin selectable by SEL1 and SEL2 for flexibility. The MAX8621Y/MAX8621Z offer different sets of LDO output voltages.

A microprocessor reset output (active-low RESET) monitors OUT1 and warns the system of impending power loss, allowing safe shutdown. Active-low RESET asserts during power-up, power-down, shutdown, and fault conditions where V_OUT1 is below its regulation voltage.

A 200mA driver output is provided to control LED backlighting or provide an open-drain connection for resistors such as in feedback networks.

Key Features

Applications/Uses

Two 500mA Step-Down Converters
- Up to 4MHz Switching Frequency
- Adjustable Output from 0.6V to 3.3V
Four Low-Noise LDOs with Pin-Programmable Output Voltages
One Open-Drain Driver
60ms (typ) Reset Timer
Power-On/Off Control Logic and Sequencing
4mm x 4mm x 0.8mm 24-Pin Thin QFN

	Cellular Handsets
	Digital Cameras
	MP3 Players
	Smartphones and PDAs
	Wireless Local Area Networks (WLANs)

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Preset V_OUT (V)

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Fixed Freq/PWM Operation

Operating Freq. (kHz)

Internal Power Switch(es)

Synchronous Rectifier

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX8621Y

Step-Down

2.6

5.5

2.5
2.8
2.85
3.0
3.3

0.6

3.3

0.5

0.16

Yes

4000

Yes

THIN QFN/24

$3.70 @ 1k

MAX8621Z

1.5
1.8
2.6
2.9
3.0
3.3

$3.70 @ 1k

See All Switch-Mode DC-DC Power Supplies (418)

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.