Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
ABSOLUTE MAXIMUM RATINGS
OUT, LX, SHDN, LBI, LBO, BATT to GND................-0.3V to +6V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+±50°C
Storage Temperature Range.............................-65°C to +±50°C
Lead Temperature (soldering, ±0s) .................................+300°C
FB .............................................................-0.3V to (V
+ 0.3V)
OUT
I
, I
..............................................................................±±.5A
LX OUT
Output Short-Circuit Duration ...................................................5s
Continuous Power Dissipation
8-Pin µMAX (derate 4.±mW/°C above +70°C).............330mW
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
= +2V, OUT = FB (V
= +25°C.)
= +3.3V), SHDN = LBI = GND, T = 0°C to +85°C, unless otherwise noted. Typical values are at
OUT A
BATT
T
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
Operating Voltage
After startup
(Note ±)
0.7
V
V
V
±.0
5.5
±.0
BATT
Startup Voltage
T
= +25 C, R = 3k
0.85
-2.2
3.3
V
A
L
Startup Voltage Tempco
mV/ C
V
FB = OUT
FB = GND
3.±7
4.80
3.43
5.20
OUT
Output Voltage
V
V
5.0
Adjustable Output Voltage
Range
2.0
5.5
MAX±795
MAX±796
MAX±797
MAX±795
MAX±796
MAX±797
±00
200
400
50
±80
300
550
±20
200
370
BATT = +2V,
FB = OUT
(V
OUT
= +3.3V)
Steady-State Output Current
I
mA
OUT
BATT = +2V,
FB = GND
±00
250
(V
OUT
= +5.0V)
Feedback Set-Point Voltage
(Adjustable Mode)
V
V
= +2V to +5.5V
±.20
±.24
±.28
V
FB
OUT
Feedback Input Current
I
V
V
= +±.24V
4
±00
0.3
nA
FB
FB
NFET
PFET
0.±7
0.27
0.25
0.5
Internal NFET, PFET On-
Resistance
= +3.3V,
OUT
R
DS(ON)
I
= ±00mA
LX
0.45
0.35
0.625
±.25
MAX±795
MAX±796
MAX±797
0.2
0.4
0.8
LX Switch Current Limit (NFET
only)
I
A
LIM
±.0
LX Leakage Current
I
V
V
= 0 and +5.5V, V = +5.5V
OUT
0.2
A
LEAK
LX
FB
Synchronous Rectifier Turn-Off
Current Limit
25
200
25
mA
Damping Switch On-Resistance
R
±00
400
45
DAMP
Operating Current into OUT
(Note 2)
= +±.4V
A
2
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
