Rainbow Electronics MAX1842 User Manual
Page 2
MAX1742/MAX1842
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
CC
= 3.3V, FBSEL = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage
V
IN
, V
CC
3.0
5.5
V
T
A
= +25
°C
to +85
°C
2.500
2.525
2.550
FBSEL =
V
CC
T
A
= +0
°C
to +85
°C
2.487
2.525
2.563
T
A
= +25
°C
to +85
°C
1.500
1.515
1.530
FBSEL =
unconnected
T
A
= +0
°C
to +85
°C
1.492
1.515
1.538
T
A
= +25
°C
to +85
°C
1.800
1.818
1.836
FBSEL =
REF
T
A
= +0
°C
to +85
°C
1.791
1.818
1.845
T
A
= +25
°C
to +85
°C
1.089
1.100
1.111
Preset Output Voltage
V
OUT
V
IN
= 3V to
5.5V,
I
LOAD
= 0
to 1A for
MAX1742,
I
LOAD
= 0
to 2.5A for
MAX1842,
V
FB
= V
OUT
FBSEL =
GND
T
A
= +0
°C
to +85
°C
1.084
1.100
1.117
V
Adjustable Output Voltage
Range
V
IN
= V
CC
= 3V to 5.5V, I
LOAD
= 0,
FBSEL = GND
V
REF
V
IN
V
AC Load Regulation Error
2
%
DC Load Regulation Error
0.4
%
Dropout Voltage
V
DO
V
IN
= V
CC
= 3V, I
LOAD
= 1A
250
mV
T
A
= +25
°C to +85°C
1.089
1.100
1.111
Reference Voltage
V
REF
T
A
= +0
°C to +85°C
1.084
1.100
1.117
V
Reference Load Regulation
∆V
REF
I
REF
= -1µA to +10µA
0.5
2
mV
V
IN
= 4.5V
90
200
PMOS Switch
On-Resistance
R
ON, P
I
LX
= 0.5A
V
IN
= 3V
110
250
V
IN
= 4.5V
70
150
NMOS Switch
On-Resistance
R
ON, N
I
LX
= 0.5A
V
IN
= 3V
80
200
m
Ω
V
CC
, IN to GND ........................................................-0.3V to +6V
IN to V
CC
.............................................................................±0.3V
GND to PGND.....................................................................±0.3V
All Other Pins to GND.................................-0.3V to (V
CC
+ 0.3V)
LX Current (Note 1).............................................................±4.7A
REF Short Circuit to GND Duration ............................Continuous
ESD Protection .....................................................................±2kV
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 16.7mW/°C above +70°C;
part mounted on 1 in.
2
of 1oz. copper) ...............................1W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +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 IC’s package power dissipation limits.