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MAX1830 Fiches technique(PDF) 1 Page - Maxim Integrated Products

No de pièce MAX1830
Description  3A, 1MHz, Low-Voltage, Step-Down Regulators with Synchronous Rectification and Internal Switches
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1830 Fiches technique(HTML) 1 Page - Maxim Integrated Products

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3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
________________________________________________________________ Maxim Integrated Products
1
19-2198; Rev 0; 10/01
General Description
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 45m
PMOS power switch and 55m
Ω 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 VIN. The MAX1831 produces preset +3.3V, +2.5V, and
+1.5V output voltages and an adjustable output from
+1.1V to VIN. They achieve efficiencies as high as 94%.
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.
Applications
5V or 3.3V to Low-Voltage Conversion
CPU I/O Supplies
Chipset Supplies
Notebook and Subnotebook Computers
Features
o ±1.5% Output Accuracy
o 94% Efficiency
o Internal PMOS/NMOS Switches
45m
Ω/55mΩ On-Resistance at VIN = +4.5V
50m
Ω/55mΩ On-Resistance at VIN = +3V
o Output Voltages
+3.3V, +2.5V, or +1.5V Pin Selectable (MAX1831)
+2.5V, +1.8V, or +1.5V Pin Selectable (MAX1830)
+1.1V to VIN Adjustable (Both Devices)
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
Idle Mode is a trademark of Maxim Integrated Products, Inc.
Typical Configuration
TOFF
COMP
VCC
FBSEL
SHDN
IN
PGND
GND
REF
LX
FB
MAX1830
MAX1831
OUTPUT
+1.1V TO
VIN
INPUT
+3V TO
+5.5V
EVALUATION
KIT
AVAILABLE
Pin Configuration appears at end of data sheet.
PART
MAX1830EEE
-40°C to +85°C
TEMP. RANGE
PIN-PACKAGE
16 QSOP
Ordering Information
MAX1831EEE
-40°C to +85°C
16 QSOP
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.


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