MAX1842 Maxim, MAX1842 Datasheet
MAX1842
Manufacturer Part Number
MAX1842
Description
1A/2.7A / 1MHz / Step-Down Regulators with Synchronous Rectification and Internal Switches
Manufacturer
Maxim
Datasheet
1.MAX1842.pdf
(16 pages)
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The MAX1742/MAX1842 constant-off-time, pulse-width-
modulated (PWM) step-down DC-DC converters are ideal
for use in 5V and 3.3V to low-voltage conversion neces-
sary in notebook and subnotebook computers. These
devices feature internal synchronous rectification for high
efficiency and reduced component count. They require
no external Schottky diode. The internal 90mΩ PMOS
power switch and 70mΩ NMOS synchronous-rectifier
switch easily deliver continuous load currents up to 1A.
The MAX1742/MAX1842 produce a preset 2.5V, 1.8V, or
1.5V output voltage or an adjustable output from 1.1V to
V
The MAX1742/MAX1842 use a unique current-mode,
constant-off-time, PWM control scheme, which includes
Idle Mode™ to maintain high efficiency during light-load
operation. The programmable constant-off-time architec-
ture sets switching frequencies up to 1MHz, allowing the
user to optimize performance trade-offs between effi-
ciency, output switching noise, component size, and
cost. Both devices are designed for continuous output
currents up to 1A. The MAX1742 uses a peak current
limit of 1.3A (min) and is suitable for applications requir-
ing small external component size and high efficiency.
The MAX1842 has a higher current limit of 3.1A (min)
and is intended for applications requiring an occasional
burst of output current up to 2.7A. Both devices also fea-
ture an adjustable soft-start to limit surge currents during
startup, a 100% duty cycle mode for low-dropout opera-
tion, and a low-power shutdown mode that disconnects
the input from the output and reduces supply current
below 1µA. The MAX1742/MAX1842 are available in 16-
pin QSOP packages.
For similar devices that provide continuous output cur-
rents up to 2A and 3A, refer to the MAX1644 and
MAX1623 data sheets.
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.
19-1760; Rev 1; 2/02
Pin Configuration appears at end of data sheet.
Idle Mode is a trademark of Maxim Integrated Products.
IN
5V or 3.3V to Low-Voltage Conversion
CPU I/O Ring
Chipset Supplies
Notebook and Subnotebook Computers
. They achieve efficiencies as high as 95%.
Synchronous Rectification and Internal Switches
________________________________________________________________ Maxim Integrated Products
1A/2.7A, 1MHz, Step-Down Regulators with
General Description
Applications
o ±1% Output Accuracy
o 95% Efficiency
o Internal PMOS and NMOS Switches
o Output Voltage
o 3V to 5.5V Input Voltage Range
o 600µA (max) Operating Supply Current
o <1µA Shutdown Supply Current
o Programmable Constant-Off-Time Operation
o 1MHz (max) Switching Frequency
o Idle-Mode Operation at Light Loads
o Thermal Shutdown
o Adjustable Soft-Start Inrush Current Limiting
o 100% Duty Cycle During Low-Dropout Operation
o Output Short-Circuit Protection
o 16-Pin QSOP Package
MAX1742EEE
MAX1842EEE
INPUT
2.2µF
3V TO
5.5V
90mΩ On-Resistance at V
110mΩ On-Resistance at V
2.5V, 1.8V, or 1.5V Pin Selectable
1.1V to V
PART
10Ω
470pF
IN
Adjustable
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Typical Configuration
SHDN
COMP
TOFF
IN
V
Ordering Information
CC
MAX1742
MAX1842
FBSEL
PGND
GND
REF
SS
LX
FB
IN
IN
= 4.5V
= 3V
16 QSOP
16 QSOP
PIN-PACKAGE
0.01µF
Features
1µF
OUTPUT
1.1V TO
V
IN
1
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