MAX1623 データシートの表示（PDF） - Maxim Integrated
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MAX1623
Maxim Integrated
MAX1623 Datasheet PDF : 12 Pages
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19-1436; Rev 2; 3/02
EVALUAATVIOANILKAIBTLMEANUAL
3A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
General Description
The MAX1623 switch-mode buck regulator with syn-
chronous rectification provides local CPU and bus-ter-
mination power in notebook and desktop computers.
An internal 55mΩ (typ), 3A PMOS power switch and
60mΩ (typ), 3A NMOS synchronous-rectifier switch
deliver continuous load currents up to 3A from a 5V
supply with 95% typical efficiency. Output accuracy is
±1%, including line and load regulation.
The MAX1623 features constant-off-time, current-mode
pulse-width-modulation (PWM) control with switching
frequencies as high as 350kHz. An external resistor at
the TOFF pin sets the off-time, allowing optimum design
flexibility in terms of switching frequency, output switch-
ing noise, and inductor size. This device is available in
a space-saving 20-pin SSOP package.
________________________Applications
5V to 3.3V Conversion
Notebook Computer CPU I/O Supply
Desktop Computer Bus-Termination Supply
CPU Daughter Card Supply
DSP Supply
Typical Operating Circuit
____________________________Features
o ±1% Output Accuracy, Including Line and Load
Regulation
o 94% Efficiency
o Internal Switches
55mΩ PMOS Power Switch
60mΩ NMOS Synchronous-Rectifier Switch
o Guaranteed 3A Load Capability
o Minimal External Components
o Pin-Selectable Fixed 3.3V, 2.5V, or
Adjustable (1.1V to 3.8V) Output Voltage
o 4.5V to 5.5V Input Voltage Range
o 400µA (typ) Supply Current
o <1µA Shutdown Supply Current
o Constant-Off-Time PWM Operation
o Switching Frequencies Up to 350kHz
o Idle Mode™ Operation at Light Loads
o Thermal Shutdown Protection
o Available in 20-Pin SSOP
PART
MAX1623EAP
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
20 SSOP
Pin Configuration
5V
INPUT
IN
LX
MAX1623
VCC
FBSEL
PGND
SHDN
FB
TOFF GND
COMP REF
2.5V
OUTPUT
TOP VIEW
LX 1
IN 2
LX 3
IN 4
LX 5
IN 6
SHDN 7
FBSEL 8
TOFF 9
FB 10
MAX1623
20 LX
19 PGND
18 LX
17 PGND
16 LX
15 PGND
14 VCC
13 COMP
12 REF
11 GND
SSOP
Idle Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
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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