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MAX1709ESE

Part # MAX1709ESE
Description IC REG BST ADJ/PROG 7.5A 16SOIC
Category IC
Availability In Stock
Qty 4
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1 + $4.91297
Manufacturer Available Qty
MAXIM
Date Code: 0438
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

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
♦ On-Chip 10A Power MOSFET
♦ 5V, 4A 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)
MAX1709
4A, Low-Noise, High-Frequency,
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
ONA ONB
CLK
3.3/5
PGND
PGND
PGND
FB
OUT
TOP VIEW
MAX1709
NARROW SO
LX
LX
SS/LIM
LX
GND
REF
GND
Pin Configuration
ONA
REF
SS/LIM
CLK
OUTPUT
3.3V, 5V,
OR ADJ
UP TO 4A
OUT
GND
LX
1µH
OFF
ON
INPUT
1V TO 5V
SYNC
OR
INTERNAL
MAX1709
Typical Operating Circuit
19-1724; Rev 0; 5/00
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.
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX1709ESE -40°C to +85°C 16 Narrow SO
MAX1709
4A, Low-Noise, High-Frequency,
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)
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
PARAMETER CONDITIONS MIN TYP MAX UNITS
3.3/5 = GND, I
SW
= 1A 3.26 3.34 3.42
Output Voltage V
FB
< 0.1V (Note 1)
3.3/5 = OUT, I
SW
= 1A 4.92 5.05 5.17
V
Load Regulation Measured between 1A < I
SW
< 3A (Note 2) -
0.25
-
0.45
%/A
FB Regulation Voltage I
SW
= 1A
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 (Note 3) 2.0 2.3 V
Frequency in Startup Mode V
OUT
= 1.5V 40 400 kHz
Minimum Startup Voltage I
OUT
< 1mA (Note 1), 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) 200 440 µA
OUT Leakage Current In
Shutdown
V
ONB
= 3.6V 0.1 5 µA
LX Leakage Current V
LX
= V
ONB
= V
OUT
= +5.5V 0.1 40 µA
N-Channel Switch
On-Resistance
22 40 m
Ω
SS/LIM = open
7.5
9
12
N-Channel Current Limit
SS/LIM = 150k
to GND
3.5
5
6.5
A
RMS Switch Current 10
A
RMS
Reference Voltage I
REF
= 0
1.245
1.260
1.275
V
Reference Load Regulation -1µA
″
I
REF
″
50µA410mV
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
x
V
OUT
Input Low Level (Note 7)
CLK, 2.7V < V
OUT
< 5.5V
0.2
x
V
OUT
V
MAX1709
4A, Low-Noise, High-Frequency,
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
< 5.5
0.8
V
OUT
Input High Level
CLK, 2.7 V< V
OUT
< 5.5V
x
V
OUT
V
Logic Input Current ONA,
ONB
, CLK, 3.3/5 1 µA
Internal Oscillator Frequency 520 600 680 kHz
Maximum Duty Cycle 82 90 94 %
External Clock Frequency
Range
350
1000
kHz
CLK Pulse Width (Note 8) 100 ns
CLK Rise/Fall Time (Note 8) 50 ns
x
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
FB
< 0.1V, V
IN
= +2.4V 3.3/5 = GND, I
SW
= 1A 3.24 3.45
Output Voltage
(Note 1) 3.3/5 = OUT, I
SW
= 1A 4.9 5.2
V
FB Regulation Voltage I
SW
= 1A 1.21 1.27 V
FB Input Current V
FB
= +1.5V 200 nA
Load Regulation Measured between 1A < I
SW
< 5A (Note 2) -0.45 %/A
Soft-Start Pin Current SS/LIM = 1V 3.2 5.2 µA
OUT Leakage Current in
Shutdown
V
ONB
= 3.6V 5 µA
OUT Supply Current V
FB
= 1.5V (Note 6) 400 µA
N-Channel Switch
On-Resistance
40 mΩ
SS/LIM = unconnected 7.5 15
N-Channel Current Limit
SS/LIM = 150kΩ to GND 3.5 7
V
Reference Voltage I
REF
= 0 1.24 1.28 V
1234NEXT
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