Rainbow Electronics MAX8884Z - Manual

General Description
The MAX8884Y/MAX8884Z step-down converters with
dual low-dropout (LDO) linear regulators are intended to
power low-voltage microprocessors, DSPs, camera and
Wi-Fi modules, or other point of load applications in
portable devices. These ICs feature high efficiency with
small external component size. The step-down converter
output voltage is pin selectable between 1.2V and 1.8V,
and provides guaranteed output current of 700mA. The
2/4MHz hysteretic-PWM control scheme allows for tiny
external components and reduces no-load operating
current to 50μA. Two low quiescent current, low-noise
LDOs operate down to 2.7V supply voltage. Two switch-
ing frequency options are available—MAX8884Y (2MHz)
and MAX8884Z (4MHz)—allowing optimization for small-
est solution size or highest efficiency. Fast switching
allows the use of small ceramic 2.2μF input and output
capacitors while maintaining low ripple voltage. The
MAX8884Y/MAX8884Z have individual enables for each
output, maximizing flexibility.
The MAX8884Y/MAX8884Z are available in a 16-bump,
2mm x 2mm CSP package (0.7mm max height).
Applications
Cell Phones/Smartphones
PDA and Palmtop Computers
Portable MP3 and DVD Players
Digital Cameras, Camcorders
PCMCIA Cards
Handheld Instruments
Features
♦ Step-Down Converter
Pin-Selectable Output Voltage (1.2V/1.8V)
2MHz or 4MHz Switching Frequency
Low-Output Voltage Ripple
700mA Output Drive Capability
Simple Logic ON/OFF Control
Tiny External Components
♦ Low-Noise LDOs
2 x 300mA LDO
Pin-Selectable Output Voltage (LDO1)
Low 26µV
RMS (typ) Output Noise
High 65dB (typ) PSRR
Simple Logic ON/OFF Control
♦ Low 0.1µA Shutdown Current
♦ 2.7V to 5.5V Supply Voltage Range
♦ Thermal Shutdown
♦ Tiny, 2mm x 2mm x 0.65mm CSP Package (4x4 Grid)
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
________________________________________________________________ Maxim Integrated Products 1
19-4418; Rev 0; 4/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Typical Application Circuit appears at end of data sheet.
AGND PGND REFBP NC1
BUCK_EN LX LDO2 LDO2_EN
MAX8884Y
MAX8884Z
SEL IN1A IN2 IN1B
LDO1_EN FB LDO1 NC2
TOP VIEW
(BUMPS ON BOTTOM)
A1 A2 A3 A4
B1 B2 B3 B4
C1 C2 C3 C4
D1 D2 D3 D4
CSP
Pin Configuration
IN1A
LX
FB
2.2 μH
AGND
BUCK_EN
LDO1_EN
LDO2_EN
IN2
BATT
2.7V TO 5.5V
BATT
2.7V TO 5.5V
BUCK ON/OFF
BUCK
1.2V/1.8V
REFBP
IN1B
LDO1 ON/OFF
LDO2 ON/OFF
LDO2
LDO1
V LDO2
UP TO 300mA
V LDO1
UP TO 300mA
PGND
SEL
2.2 μF
2.2 μF
BUCK/LDO1 VOLTAGE
SELECTION
MAX8884Y
MAX8884Z
Typical Operating Circuit
Ordering Information
PART PIN-PACKAGE
SWITCHING
FREQUENCY
MAX8884YEREKE+T 16 CSP 2MHz
MAX8884ZEREKE+T 16 CSP 4MHz
Note: All devices are specified over the -40°C to +85°C operat-
ing temperature range.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.