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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1708 Datasheet

High-Frequency / High-Power / Low-Noise / Step-Up DC-DC Converter

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MAX1708 pdf
19-2068; Rev 0; 7/01
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
o On-Chip 5A Power MOSFET
o 5V, 2A Output from a 3.3V Input
o Fixed 3.3V or 5V Output Voltage or
Adjustable (2.5V to 5.5V)
o Input Voltage Range Down to 0.7V
o Low Power Consumption
1mW Quiescent Power
1µA Current in Shutdown Mode
o Low-Noise, Constant Frequency Operation
(600kHz)
o Synchronizable Switching Frequency
(350kHz to 1000kHz)
o 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
PART
MAX1708EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 QSOP
Typical Operating Circuit
Pin Configuration
INPUT
1V TO 5V
2.2µH
OFF ON
SYNC
OR
INTERNAL
ONA LX
MAX1708
CLK
SS/LIM
GND
REF OUT
OUTPUT
3.3V, 5V,
OR ADJ
UP TO 2A
TOP VIEW
ONB 1
ONA 2
LX 3
LX 4
LX 5
GND 6
SS/LIM 7
REF 8
MAX1708
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/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1708 Datasheet

High-Frequency / High-Power / Low-Noise / Step-Up DC-DC Converter

No Preview Available !

MAX1708 pdf
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ONA, ONB, OUT, SS/LIM, 3.3/5 to GND ...............-0.3V to +6.0V
LX to PGND ...........................................................-0.3V to +6.0V
FB, CLK, REF to GND.............................. -0.3V to (VOUT + 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.30mW/°C above +70°C). .......667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VOUT = VCLK = +3.6V, ONA = ONB = FB = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Output Voltage
Load Regulation
FB Regulation Voltage (VFB)
FB Input Current
Output Voltage Adjust Range
Output Undervoltage Lockout
(Note 3)
Frequency in Startup Mode
Minimum Startup Voltage
Minimum Operating Voltage
Soft-Start Pin Current
OUT Supply Current
OUT Leakage Current In
Shutdown
LX Leakage Current
N-Channel Switch
On-Resistance
N-Channel Current Limit
RMS Switch Current
Reference Voltage
Reference Load Regulation
Reference Supply Rejection
Input Low Level (Note 7)
CONDITIONS
VFB < 0.1V (Note 1)
3.3/5 = GND, ISW = 0.5A
3.3/5 = OUT, ISW = 0.5A
Measured between 0.5A < ISW < 1.5A (Note 2)
ISW = 0.5A
VFB = +1.5V
Rising and falling
VOUT =1.5V
IOUT < 1mA, TA = +25°C (Note 4)
(Note 5)
VSS/LIM = 1V
VFB = 1.5V (Note 6)
V ONB = 3.6V
VLX = V ONB = VOUT = +5.5V
SS/LIM = open
SS/LIM = 150kto GND
IREF = 0
-1µA IREF 50µA
+2.5V VOUT +5.5V
ONA, ONB, 3.3/5, 1.2V < VOUT < 5.5V
CLK, 2.7V < VOUT < 5.5V
MIN
3.26
4.90
1.215
2.5
2.0
40
3.2
4.5
1.80
1.245
TYP
3.34
5.05
-0.40
1.240
1
MAX
3.42
5.20
-0.60
1.265
200
5.5
UNITS
V
%/A
V
nA
V
2.3 V
400 kHz
0.9 1.1
V
0.7 V
4 5.0 µA
200 300
µA
0.1 2 µA
1 25 µA
30 80 m
5.3 7.0
3.00 3.85
5
1.260 1.275
4 10
0.2 5
0.2 VOUT
0.2 VOUT
A
ARMS
V
mV
mV
V
2 _______________________________________________________________________________________


Part Number MAX1708
Description High-Frequency / High-Power / Low-Noise / Step-Up DC-DC Converter
Maker Maxim
Total Page 13 Pages
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