MAX1644
2A, Low-Voltage, Step-Down Regulator 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.
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)...........................................................±3.75A
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)............................1.2W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................ +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.
Hysteresis = 15°C
SHDN = GND
SHDN = GND
I
LOAD
= 0 to
2A,
V
FB
= V
OUT
V
FB
= 1.2V
(Note 2)
V
IN
= V
CC
= 3V, I
LOAD
= 1A, FBSEL = V
CC
I
LX
= 0.5A
FBSEL = REF, V
CC
, or unconnected
V
IN
= V
CC
= 3V to 5.5V,
I
LOAD
= 0, FBSEL = GND or REF
FBSEL = GND
I
REF
= -1µA to +10µA
CONDITIONS
°C150T
SHDN
Thermal Shutdown
Threshold
µA15I
IN
PMOS Switch Off-Leakage
Current
µA<1 3I
CC(SHDN)
Shutdown Supply Current
µA240 360I
IN
+ I
CC
No-Load Supply Current
kHz350fSwitching Frequency
A0.25 0.45 0.65I
IM
Idle Mode Current
Threshold
A2.5 2.9 3.3I
LIMIT
Current-Limit Threshold
mΩ
100 200
R
ON, P
PMOS Switch
On-Resistance
70 150
mV0.5 1∆V
REF
Reference Load Regulation
2.500 2.525 2.550 V
3.300 3.333 3.366
V3.0 5.5V
IN
, V
CC
Input Voltage
V1.089 1.100 1.111V
REF
Reference Voltage
mV200V
DO
Dropout Voltage
%
0.4
1.089 1.100 1.111
V
OUT
Preset Output Voltage
Adjustable Output Voltage
Range
VV
REF
V
IN
0.2
DC Load Regulation Error
UNITSMIN TYP MAXSYMBOLPARAMETER
V
IN
= V
CC
= 4V to 5.5V,
FBSEL = unconnected
V
IN
= V
CC
= 3V to 5.5V,
FBSEL = V
CC
V
IN
= V
CC
= 3V to 5.5V,
FBSEL = REF
V
IN
= 4.5V
V
IN
= 3V
I
LX
= 0.5A mΩ
100 200
R
ON, N
NMOS Switch
On-Resistance
70 150V
IN
= 4.5V
V
IN
= 3V
FBSEL = GND
FBSEL = REF, V
CC
, or unconnected
1
AC Load Regulation Error %
2
A2.5RMS LX Output Current
(12 Seiten)
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