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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1709 Datasheet

4A / Low-Noise / High-Frequency / Step-Up DC-DC Converter

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MAX1709 pdf
19-1724; Rev 0; 5/00
4A, Low-Noise, High-Frequency,
Step-Up DC-DC Converter
General Description
The MAX1709 sets a new standard of space savings for
high-power, step-up DC-DC conversion. It delivers up
to 20W 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 pushbut-
ton switch, as well as conventional on/off logic control.
The MAX1709 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 10A. For a device with a lower current
rating, smaller size, and lower cost, refer to the
MAX1708 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
o On-Chip 10A Power MOSFET
o 5V, 4A 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)
PART
MAX1709ESE
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 Narrow SO
Typical Operating Circuit
INPUT
1V TO 5V
1µH
OFF ON
SYNC
OR
INTERNAL
ONA LX
MAX1709
CLK
SS/LIM
GND
REF OUT
OUTPUT
3.3V, 5V,
OR ADJ
UP TO 4A
Pin Configuration
TOP VIEW
ONA 1
LX 2
LX 3
LX 4
GND 5
SS/LIM 6
REF 7
GND 8
MAX1709
16 ONB
15 CLK
14 3.3/5
13 PGND
12 PGND
11 PGND
10 FB
9 OUT
NARROW SO
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1709 Datasheet

4A / Low-Noise / High-Frequency / Step-Up DC-DC Converter

No Preview Available !

MAX1709 pdf
4A, Low-Noise, High-Frequency,
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 Narrow SO (derate 16.5mW/°C above +70°C) .....1.3W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature ........................................-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
FB Input Current
Output Voltage Adjust Range
Output Undervoltage Lockout
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 = 1A
3.3/5 = OUT, ISW = 1A
Measured between 1A < ISW < 3A (Note 2)
ISW = 1A
VFB = +1.5V
(Note 3)
VOUT = 1.5V
IOUT < 1mA (Note 1), 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
4.92
1.215
2.5
2.0
40
3.2
7.5
3.5
1.245
TYP
3.34
5.05
-0.25
1.240
1
0.9
0.7
4
200
0.1
0.1
22
9
5
1.260
4
0.2
MAX
3.42
5.17
-0.45
1.265
200
5.5
2.3
400
1.1
5.0
440
5
40
40
12
6.5
10
1.275
10
5
0.2 x
VOUT
0.2 x
VOUT
UNITS
V
%/A
V
nA
V
V
kHz
V
V
µA
µA
µA
µA
m
A
ARMS
V
mV
mV
V
2 _______________________________________________________________________________________


Part Number MAX1709
Description 4A / Low-Noise / High-Frequency / Step-Up DC-DC Converter
Maker Maxim
Total Page 12 Pages
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