
M
Low-Voltage, Step-Down DC-DC Converters
in SOT23
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
IN,
SHDN
to GND.....................................................-0.3V to +6V
OUT, FB, LX to GND....................................-0.3V to (V
IN
+ 0.3V)
OUT Short Circuit to GND..........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
ELECTRICAL CHARACTERISTICS
(V
IN
= +2.7V to +5.5V,
SHDN
= IN,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless otherwise noted.)
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.
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETER
SYMBOL
V
IN
V
START
CONDITIONS
MIN
2.7
TYP
MAX
5.5
2.0
1.95
UNITS
V
V
Input Voltage Range
Startup Voltage
V
IN
rising
V
IN
falling
1.85
1.65
200
UVLO Threshold
V
UVLO
1.55
V
UVLO Hysteresis
mV
Quiescent Supply Current
I
IN
No switching, no load (FB/OUT above trip
point)
40
70
μ
A
Shutdown Supply Current
Outp ut V ol ag e Range ( MAX 1733)
I
SHDN
V
OUT
SHDN
= GND
0.01
4
μ
A
V
1.25
-1.5
-3
2.0
+1.5
+3
I
OUT
= 0, T
A
= +25
°
C
I
OUT
= 0 to 250mA
I
OUT
= 0 to 250mA
V
IN
= 2.7V to 5.5V
V
OUT
= V
REG
, V
IN
= V
SHDN
= 5V
T
A
= +25
°
C, V
IN
= 3.6V
V
IN
= 3.6V
V
FB
= 1.5V
2.7V < V
IN
< 5.5V
2.7V < V
IN
< 5.5V
SHDN
= GND or IN
Output Voltage Accuracy
(MAX1734)
%
Load Regulation
Line Regulation
OUT Sense Current (MAX1734)
0
0
4
%/mA
%/V
μ
A
8
1.231
1.220
1.250
1.269
1.280
0.2
FB Feedback Threshold
(MAX1733)
V
FB
V
FB Leakage Current (MAX1733)
SHDN
Input High Voltage
SHDN
Input Low Voltage
SHDN
Leakage Current
High-Side Current Limit
Low-Side Current Limit
I
FB
V
IH
V
IL
I
SHDN
I
LIMP
I
LIMN
0.001
μ
A
V
V
μ
A
mA
mA
1.6
0.4
1
535
430
1.4
1.1
2
1.6
0.001
425
325
0.7
0.5
1.0
0.8
40
0.1
0.1
0.4
0.4
300
200
I
LX
= -50mA, V
IN
= 3.0V
I
LX
= -50mA, V
IN
= 5.5V
I
LX
= -50mA, V
IN
= 3.0V
I
LX
= -50mA, V
IN
= 5.5V
High-Side On-Resistance
R
ONP
Rectifier On-Resistance
R
ONN
Rectifier Off-Current Threshold
LX Leakage Current
LX Reverse Leakage Current
Minimum On-Time
Minimum Off-Time
I
LXOFF
I
LXLEAK
I
LXLK,R
t
ON(MIN)
t
OFF( M N)
mA
μ
A
μ
A
μ
s
μ
s
V
IN
= 5.5V, V
LX
= 0 to V
IN
IN unconnected, V
LX
= 5.5V,
SHDN
= GND
V
IN
= 3.6V
V
IN
= 3.6V
5
5
0.28
0.28
0.5
0.5