MAX1830 Maxim, MAX1830 Datasheet
MAX1830
Manufacturer Part Number
MAX1830
Description
3A / 1MHz / Low-Voltage / Step-Down Regulators with Synchronous Rectification and Internal Switches
Manufacturer
Maxim
Datasheet
1.MAX1830.pdf
(13 pages)
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The MAX1830/MAX1831 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
necessary 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 45mΩ
PMOS power switch and 55mΩ NMOS synchronous-rec-
tifier switch easily deliver continuous load currents up to
3A. The MAX1830 produces preset +2.5V, +1.8V, or
+1.5V output voltage or an adjustable output from +1.1V
to V
+1.5V output voltages and an adjustable output from
+1.1V to V
The MAX1830/MAX1831 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
architecture sets switching frequencies up to 1MHz,
allowing the user to optimize performance trade-
offs between efficiency, output switching noise, compo-
nent size, and cost. Both devices are designed for con-
tinuous output currents up to 3A, an internal digital
soft-start to limit surge currents during startup, a 100%
duty cycle mode for low-dropout operation, and a
low-power shutdown mode that disconnects the input
from the output and reduces supply current below
1µA.The MAX1830/MAX1831 are available in 16-pin
QSOP packages.
For similar devices that provide continuous output
currents of 1A to 3A, refer to the MAX1644, MAX1623,
and MAX1742/MAX1842/MAX1843 data sheets.
19-2198; Rev 0; 10/01
Pin Configuration appears at end of data sheet.
Idle Mode is a trademark of Maxim Integrated Products, Inc.
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.
3A, 1MHz, Low-Voltage, Step-Down Regulators with
5V or 3.3V to Low-Voltage Conversion
CPU I/O Supplies
Chipset Supplies
Notebook and Subnotebook Computers
IN
. The MAX1831 produces preset +3.3V, +2.5V, and
Synchronous Rectification and Internal Switches
IN.
They achieve efficiencies as high as 94%.
________________________________________________________________ Maxim Integrated Products
General Description
Applications
o ±1.5% Output Accuracy
o 94% Efficiency
o Internal PMOS/NMOS Switches
o Output Voltages
o +3V to +5.5V Input Voltage Range
o 750µA (max) Operating Supply Current
o <1µA Shutdown Supply Current
o Programmable Constant-Off-Time Operation
o Up to 1MHz Switching Frequency
o Idle Mode Operation at Light Loads
o Thermal Shutdown
o Internal Digital Soft-Start Inrush Current Limiting
o 100% Duty Cycle During Low-Dropout Operation
o Output Short-Circuit Protection
o 16-Pin QSOP Package
MAX1830EEE
MAX1831EEE
+3V TO
INPUT
+5.5V
45mΩ/55mΩ On-Resistance at V
50mΩ/55mΩ On-Resistance at V
+3.3V, +2.5V, or +1.5V Pin Selectable (MAX1831)
+2.5V, +1.8V, or +1.5V Pin Selectable (MAX1830)
+1.1V to V
PART
IN
Adjustable (Both Devices)
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
Typical Configuration
SHDN
COMP
TOFF
IN
V
Ordering Information
CC
MAX1830
MAX1831
FBSEL
PGND
GND
REF
LX
FB
16 QSOP
16 QSOP
PIN-PACKAGE
IN
IN
Features
= +4.5V
= +3V
OUTPUT
+1.1V TO
V
IN
1
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