MAX1708_10 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter

19-2068; Rev 1; 11/10
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
General Description
The MAX1708 sets a new standard of space savings for
high-power, step-up DC-DC conversion. It delivers up
to 10W at a fixed (3.3V or 5V) or adjustable (2.5V to
5.5V) output, using an on-chip power MOSFET from a
0.7V to 5V supply.
Fixed-frequency PWM operation ensures that the
switching noise spectrum is constrained to the 600kHz
fundamental and its harmonics, allowing easy postfilter-
ing for noise reduction. External clock synchronization
capability allows for even tighter noise spectrum con-
trol. Quiescent power consumption is less than 1mW to
extend operating time in battery-powered systems.
Two control inputs (ONA, ONB) allow simple push-on,
push-off control through a single momentary push-but-
ton switch, as well as conventional on/off logic control.
The MAX1708 also features programmable soft-start
and current limit for design flexibility and optimum per-
formance with batteries. The maximum RMS switch cur-
rent rating is 5A. For a device with a higher (10A)
switch current rating, refer to the MAX1709 data sheet.
Features
♦ On-Chip 5A Power MOSFET
♦ 5V, 2A Output from a 3.3V Input
♦ Fixed 3.3V or 5V Output Voltage or
Adjustable (2.5V to 5.5V)
♦ Input Voltage Range Down to 0.7V
♦ Low Power Consumption
1mW Quiescent Power
1µA Current in Shutdown Mode
♦ Low-Noise, Constant Frequency Operation
(600kHz)
♦ Synchronizable Switching Frequency
(350kHz to 1000kHz)
♦ Small QSOP Package
________________________Applications
Routers, Servers, Workstations, Card Racks
Local 2.5V to 3.3V or 5V Conversion
Local 3.3V to 5V Conversion
3.6V or 5V RF PAs in Communications Handsets
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX1708EEE+
-40°C to +85°C
16 QSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
INPUT
1V TO 5V
2.2μH
OFF ON
SYNC
OR
INTERNAL
ONA
LX
MAX1708
CLK
GND
SS/LIM
REF
OUT
OUTPUT
3.3V, 5V,
OR ADJ
UP TO 2A
Pin Configuration
TOP VIEW
+
ONB 1
ONA 2
LX 3
LX 4 MAX1708
LX 5
GND 6
SS/LIM 7
REF 8
QSOP
16 CLK
15 3.3/5
14 PGND
13 PGND
12 PGND
11 FB
10 OUT
9 GND
________________________________________________________________ Maxim Integrated Products 1
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.