Datasheet

MAX1920/MAX1921
IN, FB, SHDN to AGND . . . . . . . . . . . . . . . . . . . . .-0.3V to +6V
OUT to AGND, LX to PGND . . . . . . . . . . . .-0.3V to (IN + 0.3V)
AGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +0.3V
OUT Short Circuit to GND . . . . . . . . . . . . . . . . . . . . . . . . . . .10s
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) . . . .695mW
6-Pin TDFN (derate 18.2mW/°C above +70°C) . . .1454.5mW
Operating Temperature Range . . . . . . . . . . . . . .-40°C to +85°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Lead Temperature (soldering 10s) . . . . . . . . . . . . . . . . .+300°C
Low-Voltage, 400mA Step-Down
DC-DC Converters in SOT23
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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
= 3.6V, SHDN = IN, T
A
= 0°C to +85°C. Typical parameters are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
I(LX) < 400mA 2.5 5.5
Input Voltage Range
V
IN
I(LX) < 200mA
(MAX1921EUT15, MAX1921EUT18)
2.0 2.5
V
Startup Voltage 2.0 V
V
IN
rising
1.85 1.95
UVLO Threshold UVLO
V
IN
falling
1.50 1.65
V
UVLO Hysteresis
200
mV
Quiescent Supply Current
I
IN
No switching, no load 50 70 µA
Quiescent Supply Current
Dropout
I
IN
SHDN = IN, OUT/FB = 0
220
300 µA
Shutdown Supply Current
I
SHDN SHDN = GND
0.1 4.0 µA
I
OUT
= 0, T
A
= +25°C
-1.5 +1.5
I
OUT
= 0 to 400mA, T
A
= -40°C to +85°C
-3 +3
Output Voltage Accuracy
(MAX1921)
I
OUT
= 0 to 200mA, T
A
= -40°C to +85°C
-3 +3
%
SHDN = 0
1
OUT BIAS Current
I
OUT
OUT at regulation voltage 8 16
µA
Output Voltage Range (MAX1920)
Figure 4, IN = 4.5V
1.25 4.00
V
T
A
= 25°C
1.231 1.25 1.269
1.220 1.25 1.280
FB Feedback Threshold
(MAX1920)
V
FB
T
A
= -40°C to +85°C
1.210 1.280
V
FB Feedback Hysteresis
(MAX1920)
V
HYS
5mV
FB Bias Current (MAX1920)
I
FB
FB = 1.5V
0.01 0.20
µA
Load Regulation
I
OUT
= 0 to 400mA
0.005
%/mA
Line Regulation
V
IN
= 2.5V to 5.5V
0.2
%/V
SHDN Input Voltage High
V
IH
1.6 V
SHDN Input Voltage Low
V
IL
0.4 V
SHDN Leakage Current
I
SHDN
SHDN = GND or IN
0.001 1.000
µA
High-Side Current Limit
I
LIMP
525 730
950 mA