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General Description

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 cus-

tomers to trade efficiency for smaller external compo-

nents. Output current is guaranteed up to 500mA, while

quiescent current is only 40µA (typ).

Internal synchronous rectification greatly improves effi-

ciency 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 pack-

age. The MAX8561/MAX8562 are available in space-

saving 8-pin 3mm x 3mm Thin DFN packages.

Applications

Microprocessor/DSP Core Supplies

Cellular and Smart Phones

CDMA/RF Power-Amplifier Supplies

PDAs, DSC, and MP3 Players

Features

♦ 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

MAX8560/MAX8561/MAX8562

4MHz, 500mA Synchronous Step-Down

DC-DC Converters in Thin SOT and TDFN

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

GND

SHDNON/OFF

OUTPUT

0.6V TO 2.5V

UP TO 500mA

INPUT

2.7V TO 5.5V

1µH

OUT

2.2µF

MAX8560

Typical Operating Circuit

19-2954; Rev 2; 8/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE PIN-PACKAGE

TOP

MARK

MAX8560EZK-T

-40°C to +85°C 5 Thin SOT23-5

ADRX

MAX8560EZK+T

-40°C to +85°C 5 Thin SOT23-5

ADRX

MAX8561ETA-T

-40°C to +85°C

8 TDFN

AHD

MAX8561ETA+T

-40°C to +85°C

8 TDFN

AHD

MAX8562ETA-T

-40°C to +85°C

8 TDFN

AHE

MAX8562ETA+T

-40°C to +85°C

8 TDFN

AHE

GND

FBSHDN

15LXIN

MAX8560

Thin SOT23-5

TOP VIEW

TDFN

3mm × 3mm × 0.8mm

ODO

ODI

SHDN

GND

PGND

MAX8561/

MAX8562

A "+" sign will replace the first pin indicator

on lead-free packages.

Pin Configurations

+Denotes lead-free package.

Summary of content (12 pages)

PAGE 1
9-2954; Rev 2; 8/05 KIT ATION EVALU E L B AVAILA 4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN 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.
PAGE 2
MAX8560/MAX8561/MAX8562 4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN ABSOLUTE MAXIMUM RATINGS IN, FB, SHDN, ODI, ODO to GND ............................-0.3V to +6V LX to GND (Note 1)......................................-0.3V to (VIN + 0.3V) PGND to GND .......................................................-0.3V to +0.3V LX Current ...........................................................................1.27A Output Short Circuit to GND (typical operating circuit)............
PAGE 3
4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN (VIN = 3.6V, SHDN = IN, TA = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5 10 20 kΩ VIN = 5.5V, ODO = IN, TA = +25°C 0.01 0.1 VIN = 5.5V, ODO = IN, TA = +85°C 0.
PAGE 4
Typical Operating Characteristics (continued) (VIN = 3.6V, VOUT = 1.2V, L = 1µH (LQH32CN1R0M53), COUT = 2.2µF, TA = +25°C, unless otherwise noted.) EFFICIENCY vs. LOAD CURRENT (VOUT = 0.9V) 90 90 4.7µH 1µH 70 80 60 2.2µH 70 EFFICIENCY (%) 2.2µH 1µH 60 50 50 40 1 10 1000 100 80 2.2µH 1µH 70 60 50 40 0.1 4.7µH 90 4.7µH 80 EFFICIENCY (%) 40 0.1 1 10 100 1000 0.5 1.0 1.5 2.0 LOAD CURRENT (mA) OUTPUT VOLTAGE (V) NO-LOAD SUPPLY CURRENT vs.
PAGE 5
4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN LIGHT-LOAD SOFT-START WAVEFORMS HEAVY-LOAD SOFT-START WAVEFORMS MAX8560 toc12 LINE-TRANSIENT RESPONSE MAX8560 toc13 100Ω LOAD 3Ω LOAD MAX8560 toc14 VOUT 1V/div IIN 200mA/div VOUT 1V/div IIN 200mA/div 5Ω LOAD VOUT 20mV/div IL 200mA/div IL 200mA/div IL 200mA/div 0 0 VSHDN 2V/div VSHDN 2V/div 0 VIN = 4.0V VIN 500mV/div VIN = 3.
PAGE 6
MAX8560/MAX8561/MAX8562 4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN Pin Description PIN MAX8560 MAX8561 MAX8562 NAME FUNCTION 1 1 IN 2 7 GND Ground 3 8 SHDN Active-Low Shutdown Input. Connect to IN or logic high for normal operation. Connect to GND or logic low for shutdown mode. 4 6 FB — 2 PGND 5 3 LX — 5 ODO Auxiliary Open-Drain Output — 4 ODI Digital Input for Open-Drain MOSFET.
PAGE 7
4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN MAX8560/MAX8561/MAX8562 Shutdown Mode Connecting SHDN to GND or logic low places the MAX8560/MAX8561/MAX8562 in shutdown mode and reduces supply current to 0.1µA. In shutdown, the control circuitry, internal-switching P-channel MOSFET, and synchronous rectifier (N-channel MOSFET) turn off and LX becomes high impedance. Connect SHDN to IN or logic high for normal operation. IN PFET SHDN PWM LOGIC NFET LX 0.
PAGE 8
MAX8560/MAX8561/MAX8562 4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN INPUT Li+ BATTERY INPUT Li+ BATTERY 2.2µH GND PFET LX IN 2.2µF OUTPUT 1.5V OR 1.0V AT 500mA 2.2µF MAX8561 IN 100kΩ 2.2µF GND FB 120kΩ ON/OFF 1.5/1.0 SHDN ODO 2.2µF MAX8562 100kΩ 220pF ODO ODI OUTPUT 1.2V OR VBATT 1.5µH LX FB 150kΩ PGND ON/OFF HP/LP SHDN 150pF 100kΩ ODI HP = HIGH-POWER MODE LP = LOW-POWER MODE PGND Figure 2.
PAGE 9
4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN MANUFACTURER SERIES INDUCTANCE (µH) ESR (Ω) CURRENT RATING (mA) DIMENSIONS LB2012 1.0 2.2 0.15 0.23 300 240 2.0 x 1.25 x 1.45 = 3.6mm3 LB2016 1.0 1.5 2.2 3.3 0.09 0.11 0.13 0.20 455 350 315 280 2.0 x 1.6 x 1.8 = 5.8mm3 LB2518 1.0 1.5 2.2 3.3 0.06 0.07 0.09 0.11 500 400 340 270 2.5 x 1.8 x 2.0 = 9mm3 LBC2518 1.0 1.5 2.2 3.3 4.7 0.08 0.11 0.13 0.16 0.20 775 660 600 500 430 2.5 x 1.8 x 2.0 = 9mm3 LQH31C_03 1.
PAGE 10
4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN MAX8560/MAX8561/MAX8562 Chip Information TRANSISTOR COUNT: 1271 PROCESS: BiCMOS (a) MAX8560 (b) MAX8561 (c) MAX8562 Figure 4.
PAGE 11
4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN THIN SOT23.EPS ______________________________________________________________________________________ 11 MAX8560/MAX8561/MAX8562 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.
PAGE 12
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 6, 8, &10L, DFN THIN.EPS MAX8560/MAX8561/MAX8562 4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN D2 D A2 PIN 1 ID N 0.35x0.35 b PIN 1 INDEX AREA E [(N/2)-1] x e REF. E2 DETAIL A e k A1 CL A CL L L e e PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.