MAX1644EAE-T Datasheet, PDF (2/11 Pages) Maxim Integrated Products – 2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

2A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
ABSOLUTE MAXIMUM RATINGS
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, 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.
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
(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.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage
V_IN, V_CC
3.0
5.5
V
Preset Output Voltage
V_OUT
I_LOAD = 0 to
2A,
V_FB = V_OUT
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
3.300 3.333 3.366
2.500 2.525 2.550
V
1.089 1.100 1.111
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
V_DO
V_REF
ΔV_REF
R_{ON, P}
R_{ON, N}
I_LIMIT
V_IN = V_CC = 3V to 5.5V,
I_LOAD = 0, FBSEL = GND or REF
FBSEL = GND
FBSEL = REF, V_CC, or unconnected
FBSEL = GND
FBSEL = REF, V_CC, or unconnected
V_IN = V_CC = 3V, I_LOAD = 1A, FBSEL = V_CC
I_REF = -1µA to +10µA
I_LX = 0.5A
V_IN = 4.5V
V_IN = 3V
I_LX = 0.5A
V_IN = 4.5V
V_IN = 3V
V_REF
V_IN
V
1
%
2
0.2
%
0.4
200
mV
1.089 1.100 1.111
V
0.5
1
mV
70
150
mΩ
100
200
70
150
mΩ
100
200
2.5
2.9
3.3
A
2.5
A
Idle Mode Current
Threshold
I_IM
0.25 0.45 0.65
A
Switching Frequency
No-Load Supply Current
Shutdown Supply Current
PMOS Switch Off-Leakage
Current
f
I_IN + I_CC
I_CC(SHDN)
I_IN
(Note 2)
V_FB = 1.2V
SHDN = GND
SHDN = GND
350 kHz
240
360
µA
<1
3
µA
15
µA
Thermal Shutdown
Threshold
T_SHDN Hysteresis = 15°C
150
°C
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