Rainbow Electronics MAX1734 User Manual
Page 2
MAX1733/MAX1734
Low-Voltage, Step-Down DC-DC Converters
in SOT23
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
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
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
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage Range
V
IN
2.7
5.5
V
Startup Voltage
V
START
2.0
V
V
IN
rising
1.85
1.95
UVLO Threshold
V
UVLO
V
IN
falling
1.55
1.65
V
UVLO Hysteresis
200
mV
Quiescent Supply Current
I
IN
No switching, no load (FB/OUT above trip
point)
40
70
µA
Shutdown Supply Current
I
SHDN
SHDN = GND
0.01
4
µA
Outp ut V ol tag e Range ( MAX 1733) V
OUT
1.25
2.0
V
I
OUT
= 0, T
A
= +25
°C
-1.5
+1.5
Output Voltage Accuracy
(MAX1734)
I
OUT
= 0 to 250mA
-3
+3
%
Load Regulation
I
OUT
= 0 to 250mA
0
%/mA
Line Regulation
V
IN
= 2.7V to 5.5V
0
%/V
OUT Sense Current (MAX1734)
V
OUT
= V
REG
, V
IN
= V
SHDN
= 5V
4
8
µA
T
A
= +25
°C, V
IN
= 3.6V
1.231
1.250
1.269
FB Feedback Threshold
(MAX1733)
V
FB
V
IN
= 3.6V
1.220
1.280
V
FB Leakage Current (MAX1733)
I
FB
V
FB
= 1.5V
0.001
0.2
µA
SHDN Input High Voltage
V
IH
2.7V < V
IN
< 5.5V
1.6
V
SHDN Input Low Voltage
V
IL
2.7V < V
IN
< 5.5V
0.4
V
SHDN Leakage Current
I
SHDN
SHDN = GND or IN
0.001
1
µA
High-Side Current Limit
I
LIMP
300
425
535
mA
Low-Side Current Limit
I
LIMN
200
325
430
mA
I
LX
= -50mA, V
IN
= 3.0V
0.7
1.4
High-Side On-Resistance
R
ONP
I
LX
= -50mA, V
IN
= 5.5V
0.5
1.1
Ω
I
LX
= -50mA, V
IN
= 3.0V
1.0
2
Rectifier On-Resistance
R
ONN
I
LX
= -50mA, V
IN
= 5.5V
0.8
1.6
Ω
Rectifier Off-Current Threshold
I
LXOFF
40
mA
LX Leakage Current
I
LXLEAK
V
IN
= 5.5V, V
LX
= 0 to V
IN
0.1
5
µA
LX Reverse Leakage Current
I
LXLK,R
IN unconnected, V
LX
= 5.5V,
SHDN = GND
0.1
5
µA
Minimum On-Time
t
ON(MIN)
V
IN
= 3.6V
0.28
0.4
0.5
µs
Minimum Off-Time
t
OFF( M IN)
V
IN
= 3.6V
0.28
0.4
0.5
µs