MAX1644 Maxim, MAX1644 Datasheet - Page 2

• Manufacturer Part Number: MAX1644
• Description: Advanced Chemistry-Independent / Level 2 Battery Charger with Input Current Limiting
• Manufacturer: Maxim

ABSOLUTE MAXIMUM RATINGS
V
IN to V
GND to PGND.....................................................................±0.3V
All Other Pins to GND.................................-0.3V to (V
LX Current (Note 1)...........................................................±3.75A
REF Short Circuit to GND Duration ............................Continuous
ESD Protection .....................................................................±2kV
2A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
ELECTRICAL CHARACTERISTICS
(V
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.
2
Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed
CC
Input Voltage
Preset Output Voltage
Adjustable Output Voltage
Range
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
Idle Mode Current
Threshold
Switching Frequency
No-Load Supply Current
Shutdown Supply Current
PMOS Switch Off-Leakage
Current
Thermal Shutdown
Threshold
IN
, IN to GND ........................................................-0.3V to +6V
_______________________________________________________________________________________
= V
CC
PARAMETER
CC
the IC’s package power dissipation limits.
.............................................................................±0.3V
= +3.3V, FBSEL = GND, T
SYMBOL
I
V
I
CC(SHDN)
IN
R
R
T
ΔV
IN
V
I
V
V
LIMIT
SHDN
ON, N
ON, P
I
OUT
I
, V
REF
+ I
DO
IM
IN
REF
f
CC
CC
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
I
2A,
V
V
I
FBSEL = GND
FBSEL = REF, V
FBSEL = GND
FBSEL = REF, V
V
I
I
I
(Note 2)
V
SHDN = GND
SHDN = GND
Hysteresis = 15°C
LOAD
LOAD
REF
LX
LX
FB
IN
IN
FB
= 0.5A
= 0.5A
= V
= V
= V
= 1.2V
= -1µA to +10µA
= 0 to
= 0, FBSEL = GND or REF
CC
CC
OUT
CC
= 3V to 5.5V,
= 3V, I
+ 0.3V)
CC
CC
LOAD
V
FBSEL = unconnected
V
FBSEL = V
V
FBSEL = REF
V
V
V
V
CONDITIONS
, or unconnected
, or unconnected
IN
IN
IN
IN
IN
IN
IN
= V
= V
= V
= 4.5V
= 3V
= 4.5V
= 3V
= 1A, FBSEL = V
CC
CC
CC
Continuous Power Dissipation (T
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
= 4V to 5.5V,
= 3V to 5.5V,
= 3V to 5.5V,
CC
SSOP (derate 16.7mW/°C above +70°C;
part mounted on 1 in.
CC
2
of 1oz. copper) ............................1.2W
3.300
2.500
1.089
1.089
V
0.25
MIN
3.0
2.5
REF
A
A
= +70°C)
= +25°C.)
3.333
2.525
1.100
1.100
TYP
0.45
100
100
240
150
0.2
0.4
0.5
2.9
<1
70
70
1
2
3.366
2.550
1.111
1.111
MAX
0.65
200
150
200
150
200
350
360
V
5.5
3.3
2.5
15
1
3
IN
UNITS
kHz
mΩ
mΩ
mV
mV
µA
µA
µA
°C
%
%
V
V
V
V
A
A
A