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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1623 Datasheet

3A / Low-Voltage / Step-Down Regulator with Synchronous Rectification and Internal Switches

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MAX1623 pdf
19-1436; Rev 1; 9/99
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
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 55m(typ), 3A PMOS power switch and
60m(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
55mPMOS Power Switch
60mNMOS 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 ModeOperation 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 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

MAX1623 Datasheet

3A / Low-Voltage / Step-Down Regulator with Synchronous Rectification and Internal Switches

No Preview Available !

MAX1623 pdf
3A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
ABSOLUTE MAXIMUM RATINGS
IN to PGND .....................................................................0V to 6V
VCC to GND ................................................................-0.3V to 6V
PGND to GND.....................................................................±0.5V
IN to VCC.............................................................................±0.5V
LX to PGND.................................................................-0.5V to 6V
SHDN to GND .............................................................-0.3V to 6V
REF, FBSEL, COMP, FB, TOFF to GND .....-0.3V to (VCC + 0.3V)
REF Short to GND ......................................................Continuous
Continuous Power Dissipation (TA = +70°C) (with part mounted
on 1 sq. inch of one ounce copper)
20-Pin SSOP (derate 22mW/°C above +70°C) ................1.3W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°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
(VIN = VCC = +5V, FBSEL unconnected, RTOFF = 110k, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA =
+25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
4.5 5.5 V
Output Voltage
VIN = 4.5V to 5.5V,
ILOAD = 0 to 3A
FBSEL = unconnected
FBSEL = VCC
FBSEL = GND or REF
3.296
2.49
1.089
3.330
2.525
1.100
3.366
2.550
1.110
V
Output Adjustment Range
Reference Output Voltage
Reference Load Regulation
Current-Limit Threshold
FBSEL = GND or REF (Note 1)
IREF = 0
IREF = -1µA to 10µA
VREF
1.089
3.65
1.100
3.80
1.110
1
4.65
V
V
mV
A
PMOS Switch On-Resistance
NMOS Switch On-Resistance
Maximum Switching Frequency
Idle Mode Threshold (Note 2)
VIN = 4.5V
VIN = 4.5V
ILOAD 1.5A (Note 1)
55 100 m
60 100 m
350 kHz
1 1.25 1.5 A
No-Load Supply Current
Shutdown Supply Current
Does not include switching losses
SHDN = GND
400 525 µA
0.5 10 µA
LX Leakage Current
Thermal Shutdown Threshold
VIN = 5.5V, VLX = 5.5V or 0
±20 µA
145 °C
Undervoltage Lockout Threshold
VCC falling, 100mV hysteresis
4.1 4.2 4.3
V
FB Input Bias Current
FBSEL = GND, adjustable output mode, VFB = 1.2V
-25
25 nA
Error-Amplifier Gain Bandwidth
(Note 1)
500 kHz
Off-Time Adjustment Range
0.5 4 µs
Off-Time Default Period
0.85 1.00 1.15
µs
AC Output Load Regulation
SHDN Input Current
SHDN Input Low Voltage
SHDN Input High Voltage
FBSEL = GND
FBSEL = REF
SHDN = GND or VCC
1
%
2
-1 0.03
1
µA
0.8 V
2V
2 _______________________________________________________________________________________


Part Number MAX1623
Description 3A / Low-Voltage / Step-Down Regulator with Synchronous Rectification and Internal Switches
Manufacturer Maxim
Total Page 12 Pages
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