Rainbow Electronics MAX8620 - Manual

General Description
The MAX8620Y micro-power-management integrated
circuit (µPMIC) powers low-voltage microprocessors or
DSPs in portable devices. The µPMIC includes a high-
efficiency step-down DC-DC converter, two low-
dropout linear regulators (LDOs), a microprocessor
reset output, and power-on/off control logic. This device
maintains high efficiency at light loads with a low 115µA
supply current, and its miniature TDFN package makes
it ideal for portable devices.
The MAX8620Y’s step-down DC-DC converter utilizes a
proprietary 4MHz hysteretic-PWM control scheme that
allows for ultra-small external components. Internal syn-
chronous rectification improves efficiency and elimi-
nates the external Schottky diode that is required in
conventional step-down converters. The output voltage
is adjustable from 0.6V to 3.3V, with guaranteed output
current up to 500mA.
The MAX8620Y’s two LDOs offer low 45µV
RMS
output
noise and a low dropout of only 200mV at 200mA. Each
LDO delivers at least 300mA of continuous output cur-
rent. The output voltages are pin selectable from 1.8V
to 3.3V for flexibility.
A microprocessor reset output (RESET) monitors OUT1
and warns the system of impending power loss allow-
ing safe shutdown. RESET asserts during power-up,
power-down, shutdown, and fault conditions where
V
OUT1 is below its regulation voltage.
Applications
Cellular Handsets
Smart Phones/PDA Phones
PDAs
Wireless LAN
Microprocessor and DSP Solutions including
MSM™, XScale™, ARM™, and OMAP™
Features
♦ Three Regulators and a Reset in One Package
♦ High-Efficiency Step-Down Converter
Up to 4MHz Fixed Switching Frequency
500mA Guaranteed Output Current
0.6V to 3.3V Adjustable Output Voltage
±2% Initial Accuracy
Fast Voltage-Positioning Transient Response
Internal Synchronous Rectifier
♦ Two 300mA LDO Regulators
200mV Dropout at 200mA Load
Low 45µV
RMS Output Noise
3% Accuracy over Line, Load, and Temperature
Overcurrent Protection
Nine Pin-Selectable Output-Voltage Settings
♦ 30ms (min) RESET Output Flag
♦ 2.7V to 5.5V Input
♦ 115µA (typ) Supply Current at No Load
♦ Thermal-Overload Protection
♦ Tiny 3mm x 3mm x 0.8mm TDFN Package
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
MAX8620Y
OUT1
V IN
V LOGIC
100k Ω
RESET
OUT2
LX
FB
GND
IN2
BP
HF_PWR
PWR_ON
SEL1
RESET
SEL2
EN2
IN1
1.80V, 2.60V, 2.80V, 2.85V,
3.00V, OR 3.30V*
300mA
1.80V, 2.50V, 2.60V,
2.85V, OR 3.00V*
300mA
OUT3
0.6V TO 3.3V
500mA
*USE SEL1 AND SEL2 TO SET V OUT1 AND V OUT2
PART TEMP RANGE
PIN-
PACKAGE TOP
MARK
MAX8620YETD -40°C to +85°C
14 TDFN-EP
(T1433-2)
AAB
Typical Operating Circuit
19-3564; Rev 0; 1/05
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.
MSM is a trademark of QUALCOMM, Inc.
XScale is a trademark of Intel Corp.
ARM is a trademark of ARM Limited.
OMAP is a trademark of Texas Instruments, Inc.
EVALUATION KIT
AVAILABLE
Pin Configuration appears at end of data sheet.