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| MAX1843 Datasheet, PDF (2/13 Pages) Maxim Integrated Products – 2.7A, 1MHz, Low-Voltage, Step-Down Regulator with Internal Synchronous Rectification in QFN Package | |||
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2.7A, 1MHz, Low-Voltage, Step-Down Regulator with
Internal Synchronous Rectification in QFN Package
ABSOLUTE MAXIMUM RATINGS
VCC, IN to GND ........................................................-0.3V to +6V
IN to VCC.............................................................................±0.3V
GND to PGND.....................................................................±0.3V
All Other Pins to GND.................................-0.3V to (VCC + 0.3V)
LX Current (Note 1).............................................................±4.7A
REF Short Circuit to GND Duration ............................Continuous
ESD Protection .....................................................................±2kV
Continuous Power Dissipation (TA = +70°C)
28-Pin QFN (derate 20mW/°C above +70°C, part mounted
on 1in2 of 1oz copper)......................................................1.6W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) ................................ +300°C
Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed the
ICâs package power dissipation limits.
Stresses beyond those listed under âAbsolute Maximum Ratingsâ 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 = +3.3V, FBSEL = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Voltage
Preset Output Voltage
SYMBOL
VIN, VCC
VIN =
+3V to
+5.5V
VOUT
ILOAD =
0 to 2.5A
CONDITIONS
FBSEL = VCC
FBSEL =
unconnected
FBSEL = REF
TA = +25°C
to +85°C
TA = 0°C to
+85°C
TA = +25°C
to +85°C
TA = 0°C to
+85°C
TA = +25°C
to +85°C
TA = 0°C to
+85°C
MIN TYP MAX UNITS
3.0
5.5
V
2.500 2.525 2.550
2.487 2.525 2.563
1.500 1.515 1.530
1.492 1.515 1.538
V
1.800 1.818 1.836
1.791 1.818 1.845
VFB =
VOUT
FBSEL = GND
TA = +25°C
to +85°C
TA = 0°C to
+85°C
1.089 1.100 1.111
1.084 1.100 1.117
Adjustable Output Voltage
Range
VIN = VCC = +3V to +5.5V, FBSEL = GND
VREF
VIN
V
AC Load Regulation Error
DC Load Regulation Error
Dropout Voltage
Reference Voltage
Reference Load Regulation
PMOS Switch On-Resistance
NMOS Switch On-Resistance
Current-Limit Threshold
RMS LX Output Current
VDO
VREF
âVREF
RON,P
RON,N
ILIMIT
VIN = VCC = +3V, ILOAD = 1A
TA = +25°C to +85°C
TA = 0°C to +85°C
IREF = -1µA to +10µA
ILX = 0.5A
VIN = +4.5V
VIN = +3V
ILX = 0.5A
VIN = +4.5V
VIN = +3V
2
%
0.4
%
250
mV
1.089 1.100 1.111
V
1.084 1.100 1.117
0.5
2
mV
90
200
mâ¦
110 250
70
150
mâ¦
80
200
3.1
3.6
4.1
A
3.1
A
2 _______________________________________________________________________________________
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