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MAX1708EEE+

P1-P3P4-P6P7-P9P10-P12P13-P14
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.
________________________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
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
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
________________________________________________________________
Maxim Integrated Products
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
ONB CLK
3.3/5
PGND
PGND
PGND
FB
OUT
GND
TOP VIEW
MAX1708
QSOP
ONA
LX
GND
LX
LX
SS/LIM
REF
+
Pin Configuration
ONA
REF
SS/LIM
CLK
OUTPUT
3.3V, 5V,
OR ADJ
UP TO 2A
OUT
GND
LX
2.2μH
OFF
ON
INPUT
1V TO 5V
SYNC
OR
INTERNAL
MAX1708
Typical Operating Circuit
19-2068; Rev 1; 11/10
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX1708EEE+ -40°C to +85°C 16 QSOP
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.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
OUT
= V
CLK
= 3.6V, ONA = ONB = FB = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
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 (V
OUT
+ 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70°C)
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
Soldering Temperature (reflow) .......................................+260°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
3.3/5 = GND, I
SW
= 0.5A 3.26 3.34 3.42
Output Voltage V
FB
< 0.1V (Note 1)
3.3/5 = OUT, I
SW
= 0.5A 4.90 5.05 5.20
V
Load Regulation Measured between 0.5A < I
SW
< 1.5A (Note 2) -0.40 -0.60 %/A
FB Regulation Voltage (V
FB
) I
SW
= 0.5A 1.215 1.240 1.265 V
FB Input Current V
FB
= 1.5V
1
200 nA
Output Voltage Adjust Range 2.5 5.5 V
Output Undervoltage Lockout Rising and falling (Note 3) 2.0 2.3 V
Frequency in Startup Mode V
OUT
=1.5V 40 400 kHz
Minimum Startup Voltage I
OUT
< 1mA, T
A
= +25°C (Note 4) 0.9 1.1 V
Minimum Operating Voltage (Note 5) 0.7 V
Soft-Start Pin Current V
SS/LIM
= 1V 3.2 4 5.0 μA
OUT Supply Current V
FB
= 1.5V (Note 6) 200 300 μA
OUT Leakage Current In
Shutdown
V
ONB
= 3.6V 0.1 2 μA
LX Leakage Current V
LX
= V
ONB
= V
OUT
= 5.5V 1 25 μA
N-Channel Switch
On-Resistance
30 80 m
SS/LIM = open
4.5
5.3
7.0
N-Channel Current Limit
SS/LIM = 150k to GND
1.80
3.00
3.85
A
RMS Switch Current 5 A
RMS
Reference Voltage I
REF
= 0mA 1.245 1.260 1.275 V
Reference Load Regulation -1μA I
REF
50μA 4 10 mV
Reference Supply Rejection 2.5V V
OUT
5.5V 0.2 5 mV
ONA, ONB, 3.3/5, 1.2V < V
OUT
< 5.5V 0.2
V
OUT
Input Low Level (Note 7)
CLK, 2.7V < V
OUT
< 5.5V 0.2
V
OUT
V
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
OUT
= V
CLK
= 3.6V, ONA = ONB = FB = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS
(V
OUT
= V
CLK
= 3.6V, ONA = ONB = FB = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 9)
PARAMETER CONDITIONS MIN TYP MAX UNITS
ONA, ONB, 3.3/5, 1.2V < V
OUT
< 5.5V 0.8
V
OUT
Input High Level
CLK, 2.7 V< V
OUT
< 5.5V 0.8
V
OUT
V
Logic Input Current V
ONA
, V
ONB
, V
CLK
, V
3. 3/5
= 0V, 5.5V -1 1 μA
Internal Oscillator Frequency 520 600 680 kHz
Maximum Duty Cycle 82 88 94 %
External Clock Frequency
Range
350 1000 kHz
CLK Pulse Width (Note 8) 100 ns
CLK Rise/Fall Time (Note 8) 50 Ns
PARAMETER CONDITIONS MIN MAX UNITS
3.3/5 = GND, I
SW
= 0.5A 3.24 3.45
Output Voltage
V
FB
< 0.1V, V
IN
= 2.4V
(Note 1)
3.3/5 = OUT, I
SW
= 0.5A 4.90 5.22
V
FB Regulation Voltage I
SW
= 0.5A 1.20 1.28 V
FB Input Current (V
FB
) V
FB
= 1.5V 200 nA
Load Regulation Measured between 0.5A < I
SW
< 1.5A (Note 2) -0.60 %/A
Soft-Start Pin Current V
SS/LIM
= 1V 3.2 5.2 μA
OUT Leakage Current in
Shutdown
V
ONB
= 3.6V 2 μA
OUT Supply Current V
FB
= 1.5V (Note 6) 300 μA
N-Channel Switch
On-Resistance
80 m
SS/LIM = unconnected 4.5 7.5
N-Channel Current Limit
SS/LIM = 150k to GND 1.8 4.0
A
Reference Voltage I
REF
= 0mA 1.24 1.28 V
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX1708EEE+

Mfr. #:
Buy MAX1708EEE+
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators High f Step-Up DC/DC Converter
Lifecycle:
New from this manufacturer.
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