MAX8560 Datasheet PDF


Part Number

MAX8560

Description

500mA Synchronous Step-Down DC-DC Converters

Manufacture

Maxim

Total Page 12 Pages
PDF Download
Download MAX8560 Datasheet PDF


Features Datasheet pdf 19-2954; Rev 2; 8/05 EVAALVUAAILTAIOBNLE KIT 4MHz, 500mA Synchronous Step-Down D C-DC Converters in Thin SOT and TDFN M AX8560/MAX8561/MAX8562 General Descrip tion The MAX8560/MAX8561/MAX8562 step-d own DC-DC converters are optimized for applications that prioritize small size and high efficiency. They utilize a pr oprietary hysteretic-PWM control scheme that switches with fixed frequency and is adjustable up to 4MHz, allowing cus tomers 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 impro ves efficiency and eliminates the exter nal Schottky diode required in conven.
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MAX8560 Datasheet
19-2954; Rev 2; 8/05
EVAALVUAAILTAIOBNLEKIT
4MHz, 500mA Synchronous Step-Down
DC-DC Converters in Thin SOT and TDFN
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
Typical Operating Circuit
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
Ordering Information
PART
TEMP RANGE
MAX8560EZK-T -40°C to +85°C
MAX8560EZK+T -40°C to +85°C
MAX8561ETA-T -40°C to +85°C
MAX8561ETA+T -40°C to +85°C
MAX8562ETA-T -40°C to +85°C
MAX8562ETA+T -40°C to +85°C
+Denotes lead-free package.
PIN-PACKAGE
5 Thin SOT23-5
5 Thin SOT23-5
8 TDFN
8 TDFN
8 TDFN
8 TDFN
TOP
MARK
ADRX
ADRX
AHD
AHD
AHE
AHE
Pin Configurations
INPUT
2.7V TO 5.5V
CIN
2.2µF
IN LX
GND MAX8560
ON/OFF
SHDN
FB
L
1µH
R1
CFF
R2
OUTPUT
0.6V TO 2.5V
UP TO 500mA
COUT
2.2µF
TOP VIEW
IN 1
5 LX
MAX8560
GND 2
SHDN 3
4 FB
Thin SOT23-5
8 7 65
MAX8561/
MAX8562
1 2 34
TDFN
3mm × 3mm × 0.8mm
A "+" sign will replace the first pin indicator
on lead-free packages.
________________________________________________________________ Maxim Integrated Products 1
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.




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