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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1703 Datasheet

1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC Converter

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MAX1703 pdf
19-1336; Rev 2; 11/98
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
________________General Description
The MAX1703 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. It uses a synchronous-rectified
pulse-width-modulation (PWM) boost topology to gen-
erate a 2.5V to 5.5V output from battery inputs, such as
one to three NiCd/NiMH cells or one Li-Ion cell. The
device includes a 2A, 75m, N-channel MOSFET
switch and a 140m, P-channel synchronous rectifier.
With its internal synchronous rectifier, the MAX1703
delivers up to 5% better efficiency than similar nonsyn-
chronous converters. It also features a pulse-frequency-
modulation (PFM) low-power mode to improve efficiency
at light loads, and a 1µA shutdown mode.
The MAX1703 comes in a 16-pin narrow SO package
and includes an uncommitted comparator that generates
a power-good or low-battery-warning output. It also
contains a linear gain block that can be used to build a
linear regulator.
For lower-power outputs and a smaller package, refer
to the MAX1700/MAX1701. For dual outputs (step-up
plus linear regulator), refer to the MAX1705/MAX1706.
For an on-board analog-to-digital converter, refer to the
MAX848/MAX849.
The MAX1703 evaluation kit is available to speed designs.
____________________________Features
o Up to 95% Efficiency
o Up to 1.5A Output
o Fixed 5V or Adjustable Step-Up Output
(2.5V to 5.5V)
o 0.7V to 5.5V Input Range
o Low-Power Mode (300µW)
o Low-Noise, Constant-Frequency Mode (300kHz)
o Synchronizable Switching Frequency
(200kHz to 400kHz)
o 1µA Logic-Controlled Shutdown
o Power-Good Comparator
o Uncommitted Gain Block
PART
MAX1703ESE
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 Narrow SO
________________________Applications
Digital Cordless Phones Personal Communicators
PCS Phones
Palmtop Computers
Wireless Handsets
Two-Way Pagers
Hand-Held Instruments
Typical Operating Circuit
Pin Configuration
INPUT
0.7V TO 5.5V
OFF
ON
PWM
OR
SYNC
PFM
POWER-GOOD
INPUT
GAIN-BLOCK INPUT
MAX1703
LXP, LXN
ON POUT
CLK/
SEL
OUT
POKIN
AIN POK
REF AO
FB GND PGND
OUTPUT
5V OR ADJ
UP TO 1.5A
POWER-GOOD
OUTPUT
GAIN-BLOCK
OUTPUT
TOP VIEW
REF 1
FB 2
POKIN 3
OUT 4
GND 5
AIN 6
AO 7
POK 8
MAX1703
16 ON
15 POUT
14 LXP
13 POUT
12 PGND
11 LXN
10 PGND
9 CLK/SEL
Narrow SO
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1703 Datasheet

1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC Converter

No Preview Available !

MAX1703 pdf
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
OUT, ON, AO, POK to GND .....................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
LXP, LXN to PGND .................................-0.3V to (VPOUT + 0.3V)
POUT, CLK/SEL, AIN, REF, FB,
POKIN to GND.......................................-0.3V to (VOUT + 0.3V)
Continuous Power Dissipation (TA = +70°C)
Narrow SO (derate 8.70mW/°C above +70°C) .............696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+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
(CLK/SEL = AIN = ON = POKIN = FB = PGND = GND, OUT = POUT, LXP = LXN, VOUT = 5.3V (Note 1), TA = 0°C to +85°C, unless
otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
DC-DC CONVERTER
Input Supply Range
(Note 2)
0.7 5.5
V
Minimum Start-Up Voltage
Frequency in Start-Up Mode
ILOAD < 1mA, TA = +25°C (Note 3)
VOUT = 1.5V
0.9 1.1
V
40 140 300 kHz
Output Voltage
(Note 4)
VFB < 0.1V, CLK/SEL = OUT,
0 ILX 1.1A, VBATT = 3.7V
4.87 5.05 5.20
V
FB Regulation Voltage
FB Input Current
Output Voltage Adjust Range
Output Voltage Lockout Threshold
Load Regulation (Note 6)
Supply Current in Shutdown
Supply Current in Low-Power Mode
Supply Current in Low-Noise Mode
DC-DC SWITCHES
POUT, LXP Leakage Current
LXN Leakage Current
Switch On-Resistance
Switch On-Resistance
N-Channel Current Limit
P-Channel Turn-Off Current
POWER-GOOD COMPARATOR
POKIN Trip Level
POKIN Input Current
POK Low Voltage
POK High Leakage Current
Adjustable output, CLK/SEL = OUT,
0 ILX 1.1A, VBATT = 2.2V, VOUT = 3.3V
VFB = 1.25V
(Note 5)
CLK/SEL = OUT, no load to full load
ON = OUT
CLK/SEL = GND (Note 1)
CLK/SEL = OUT (Note 1)
VLXP = 0V, VOUT = VON = 5.5V
VON = VLXN = VOUT = 5.5V
N-channel
CLK/SEL = GND
CLK/SEL = OUT
P-channel
CLK/SEL = OUT
CLK/SEL = GND
CLK/SEL = GND
Rising VPOKIN
VPOKIN = 0.7V
ISINK(POK) = 1mA, VOUT = 3.6V or
ISINK(POK) = 20µA, VOUT = 1V
VOUT = VPOK = 5.5V
1.21
2.5
2.0
1.24 1.255
0.1 20
5.5
2.15 2.3
-1.6
0.1 20
65 120
150 300
V
nA
V
V
%
µA
µA
µA
2200
500
20
0.1
0.1
0.14
0.075
0.13
2700
800
160
20
20
0.25
0.13
0.25
3200
1100
260
µA
µA
mA
mA
mA
1.225
-20
1.250
1.275
20
0.03 0.4
0.01 1
V
nA
V
µA
2 _______________________________________________________________________________________


Part Number MAX1703
Description 1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC Converter
Maker Maxim
Total Page 16 Pages
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