MAX8562

4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN

First 4MHz Step-Down DC-DC Converters Deliver 500mA with Over 90% Efficiency in SOT23 and TDFN

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Overview

Up to 4MHz PWM Switching Frequency
500mA Guaranteed Output Current
40µA (typ) Quiescent Current
Adjustable Output Voltage from 0.6V to 2.5V
Logic-Controlled Output Voltage (MAX8561)
Drives External Bypass FET (MAX8562)
±1.5% Initial Accuracy
Soft-Start Eliminates Inrush Current
Fast Voltage-Positioning Transient Response
Internal Synchronous Rectifier
2.7V to 5.5V Input
0.1µA Logic-Controlled Shutdown
Thermal Shutdown
Thin SOT23 or Space-Saving 3mm x 3mm x 0.8mm TDFN Packages

The MAX8560/MAX8561/MAX8562 step-down DC-DC converters are optimized for applications that prioritize small size and high efficiency. They utilize a proprietary hysteretic-PWM control scheme that switches with fixed frequency and is adjustable up to 4MHz, allowing customers to trade efficiency for smaller external components. Output current is guaranteed up to 500mA, while quiescent current is only 40µA (typ).

Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Built-in soft-start eliminates inrush current to reduce input capacitor requirements. The MAX8561 features logic-controlled output voltage, while the MAX8562 drives an external bypass FET.

The MAX8560 is available in a 5-pin Thin SOT23 package. The MAX8561/MAX8562 are available in space-saving 8-pin 3mm x 3mm Thin DFN packages.

Applications

CDMA/RF Power-Amplifier Supplies
Cell Phones/Smartphones
Microprocessor/DSP Core Supplies
PDAs, DSC, and MP3 Players

Documentation

Data Sheet 1

MAX8560-MAX8562: 4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN Data Sheet (Rev.2) 10/13/2005

Reliability Data 1

MAX8562 Reliability Data 01/12/2023

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 2
MAX1920	PRODUCTION	Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23
MAX1921	PRODUCTION	Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23

Evaluation Kits

Evaluation Kit for the MAX8561, MAX8562

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Features and Benefits

2.7V to 5.5V Input Voltage Range
0.6V to 2.5V Adjustable Output Voltage Range
VOUT1 = 1.8V/1.5V at 500mA (MAX8561)
VOUT2 = 1.2V at 400mA or Bypass Mode (MAX8562)
2MHz PWM Switching Frequency (MAX8561)
4MHz PWM Switching Frequency (MAX8562)
0.1µA (typ) Shutdown Current
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX8561 evaluation kit (EV kit) demonstrates the MAX8561/MAX8562s' up to 4MHz pulse-width modulated (PWM) step-down DC-DC converters. The two circuits are optimized for powering the DSP/microprocessor or the power amplifiers (PAs) in wireless applications. The MAX8561 circuit provides two adjustable output voltages in the 0.6V to 2.5V range from a 2.7V to 5.5V input, and can deliver 500mA of load current. In comparison, the MAX8562 circuit provides an adjustable voltage in the 0.6V to 2.5V range and a bypass mode where the output voltage is shorted to the input by an external MOSFET.