Rainbow Electronics MAX8668 - Manual

General Description
The MAX8667/MAX8668 dual step-down converters
with dual low-dropout (LDO) linear regulators are
intended to power low-voltage microprocessors or
DSPs in portable devices. They feature high efficiency
with small external component size. The step-down
converters are adjustable from 0.6V to 3.3V (MAX8668)
or factory preset (MAX8667) with guaranteed output
current of 600mA for OUT1 and 1200mA for OUT2. The
1.5MHz hysteretic-PWM control scheme allows for tiny
external components and reduces no-load operating
current to 100µA with all outputs enabled. Dual low-qui-
escent-current, low-noise LDOs operate down to 1.7V
supply voltage. The MAX8667/MAX8668 have individ-
ual enables for each output, maximizing flexibility.
The MAX8667/MAX8668 are available in the space-
saving, 3mm x 3mm, 16-pin thin QFN package.
Applications
Cell Phones/Smartphones
PDA and Palmtop Computers
Portable MP3 and DVD Players
Digital Cameras, Camcorders
PCMCIA Cards
Handheld Instruments
Features
♦ Tiny, Thin QFN 3mm x 3mm Package
♦ Individual Enables
♦ Step-Down Converters
600mA Guaranteed Output Current on OUT1
1200mA Guaranteed Output Current on OUT2
Tiny Size 2.2µH Chip Inductor (0805)
Output Voltage from 0.6V to 3.3V (MAX8668)
Ultra-Fast Line and Load Transients
Low 25µA Supply Current Each
♦ LDOs
300mA Guaranteed
Low 1.7V Minimum Supply Voltage
Low Output Noise
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
________________________________________________________________ Maxim Integrated Products 1
15
16
14
13
5
6
7
IN34
OUT4
8
EN3
LX2 PGND2 LX1
1 3
OUT1 (FB1)
4
12 10 9
EN1
EN2
OUT2 (FB2)
REF
GND
EN4
MAX8667
MAX8668
OUT3
IN12
2
11
PGND1
THIN QFN
(3mm x 3mm)
TOP VIEW
( ) ARE FOR THE MAX8668
Pin Configuration
IN34
LX2 LX1
OUT2 OUT1
2.6V TO 5.5V
OUT3
OUT4
REF
GND
IN12
300mA
300mA
EN1
EN2
EN3
EN4
600mA 1.2A
PGND1 PGND2
10 μF 4.7 μF
4.7 μF 4.7 μF
0.01 μF
2.2 μH 2.2 μH
2.2 μF 2.2 μF
MAX8667
Typical Operating Circuit
19-0784; Rev 0; 4/07
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.
Ordering Information continued at the end of data sheet.
Selector Guide appears at the end of data sheet.
Ordering Information
Note: All MAX8667/MAX8668 parts are in a 16-pin, thin QFN,
3mm x 3mm package and operate in the -40°C to +85°C
extended temperature range.
+ Denotes a lead-free package.
PART PKG CODE TOP MARK
MAX8667ETEAA+ T1633-4 AEQ
MAX8667ETEAB+ T1633-4 AFI
MAX8667ETEAC+ T1633-4 AFM
MAX8667ETECQ+ T1633-4 AFN