Rainbow Electronics MAX8562 - Manual

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 6-pin SOT23 package.
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 Typical 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
♦ Tiny SOT23 or Space-Saving 3mm x 3mm Thin
DFN Packages
MAX8560/MAX8561/MAX8562
4MHz, 500mA Synchronous Step-Down
DC-DC Converters in SOT and TDFN
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
GND
IN LX
FB
SHDN ON/OFF
OUTPUT
0.6V TO 2.5V
UP TO 500mA
INPUT
2.7V TO 5.5V
L
1 µH
C OUT
2.2 µF
C IN
2.2 µF
C FF
R1
R2
MAX8560
PGND
Typical Operating Circuit
19-2954; Rev 0; 7/03
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
MAX8560EUT* -40°C to +85°C 6 SOT23-6 ABRY
MAX8561ETA -40°C to +85°C 8 TDFN AHD
MAX8562ETA -40°C to +85°C 8 TDFN AHE
GND
FB SHDN
1 6 LX IN
MAX8560
SOT23-6
TOP VIEW
2
3 4
TDFN
3mm × 3mm × 0.8mm
5 PGND
FB ODO
ODI
1 2
SHDN GND
PGND
LX IN
3 4
MAX8561/
MAX8562
8 7 6 5
Pin Configurations
*Future product—contact factory for availability.