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
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
BATT
= +2V, OUT = FB (V
OUT
= +3.3V), SHDN = LBI = GND,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at
T
A
= +25°C.)
PARAMETER
Minimum Input Voltage
Operating Voltage
Startup Voltage
Startup Voltage Tempco
Output Voltage
Adjustable Output Voltage Range
BATT = +2V,
FB = OUT
(V
OUT
= +3.3V)
BATT = +2V,
FB = GND
(V
OUT
= +5.0V)
V
OUT
= +2V to +5.5V
V
FB
= +1.24V
V
OUT
= +3.3V,
I
LX
= 100mA
MAX1795
I
LIM
I
LEAK
MAX1796
MAX1797
V
LX
= 0 and +5.5V, V
OUT
= +5.5V
NFET
PFET
0.2
0.4
0.8
MAX1795
MAX1796
MAX1797
MAX1795
MAX1796
MAX1797
V
OUT
FB = OUT
FB = GND
3.17
4.80
2.0
100
200
400
50
100
250
1.20
180
300
550
120
200
370
1.24
4
0.17
0.27
0.25
0.5
1.0
0.2
25
R
DAMP
V
FB
= +1.4V
100
200
25
400
45
1.28
100
0.3
0.45
0.35
0.625
1.25
µA
mA
Ω
µA
A
V
nA
Ω
mA
V
BATT
SYMBOL
After startup
(Note 1)
T
A
= +25°C, R
L
= 3kΩ
1.0
0.85
-2.2
3.3
5.0
3.43
5.20
5.5
CONDITIONS
MIN
TYP
0.7
5.5
1.0
MAX
UNITS
V
V
V
mV/°C
V
V
Steady-State Output Current
I
OUT
Feedback Set-Point Voltage
(Adjustable Mode)
Feedback Input Current
Internal NFET, PFET
On-Resistance
LX Switch Current Limit
(NFET only)
LX Leakage Current
Synchronous Rectifier Turn-Off
Current Limit
Damping Switch On-Resistance
Operating Current into OUT
(Note 2)
V
FB
I
FB
R
DS(ON)
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Maxim Integrated
│
2
MAX1795/MAX1796/
MAX1797
Low-Supply Current, Step-Up DC-DC Converters
with True Shutdown
Electrical Characteristics (continued)
(V
BATT
= +2V, OUT = FB (V
OUT
= +3.3V), SHDN = LBI = GND,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at
T
A
= +25°C.)
PARAMETER
Operating Current into BATT
Shutdown Current into BATT
LX Switch MaxImum On-Time
LX Switch Minimum Off-Time
LBI Threshold Voltage Falling
LBI Hysteresis
LBI Input Current
I
LBI
V
LBI
= +0.8V
V
BATT
= V
LBI
= +0.975V,
sinking 20µA (50Ω typ)
V
BATT
= V
LBI
= +1.1V,
sinking 100µA (25Ω typ)
V
LBO
= +5.5V
V
IL
SHDN Input Voltage
V
IH
Shutdown Input Current
V
SHDN
= 0 and +5.5V
0.8 x
V
BATT
100
1
t
ON
t
OFF
V
LBI
SYMBOL
CONDITIONS
V
FB
= +1.4V, V
LBI
= +1V
SHDN = BATT, V
LBI
= +1V
V
FB
= +1V, if current limit not reached
V
FB
= +1V
V
BATT
= +2V
V
BATT
= LBI
3
0.8
0.8
0.875
MIN
TYP
2
2
4
1
0.85
0.925
25
9
100
0.1
V
0.1
100
V
BATT
0.2 x
nA
MAX
4
4
5
1.2
0.90
0.975
UNITS
µA
µA
µs
µs
V
mV
nA
LBO Low Output Voltage
LBO Off-Leakage Current
V
nA
Electrical Characteristics
(V
BATT
= +2V, OUT = FB (V
OUT
= +3.3V), SHDN = LBI = GND,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 3)
PARAMETER
Operating Voltage
Output Voltage
Adjustable Output Voltage Range
FB = OUT
(V
OUT
= +3.3V)
I
OUT
FB = GND
(V
OUT
= +5.0V)
Feedback Set-Point Voltage
(Adjustable Mode)
Feedback Input Current
V
FB
I
FB
V
OUT
= +2V to +5.5V
V
FB
= +1.25V
MAX1795
MAX1796
MAX1797
MAX1795
MAX1796
MAX1797
SYMBOL
V
BATT
V
OUT
Note 1
FB = OUT
FB = GND
CONDITIONS
MIN
1.0
3.13
4.75
2.0
100
200
400
60
125
250
1.19
1.29
100
V
nA
mA
MAX
5.5
3.47
5.25
5.5
UNITS
V
V
V
Steady-State Output Current
(Note 1)
www.maximintegrated.com
Maxim Integrated
│
3
MAX1795/MAX1796/
MAX1797
Low-Supply Current, Step-Up DC-DC Converters
with True Shutdown
Electrical Characteristics (continued)
(V
BATT
= +2V, OUT = FB (V
OUT
= +3.3V), SHDN = LBI = GND,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 3)
PARAMETER
Internal NFET, PFET
On-Resistance
LX Switch Current Limit
(NFET only)
LX Leakage Current
Damping Switch On-Resistance
Operating Current into OUT
(Note 2)
Operating Current into BATT
Shutdown Current into BATT
LX Switch Maximum On-Time
LX Switch Minimum Off-Time
LBI Threshold Voltage
LBI Input Current
t
ON
t
OFF
V
LBI
I
LBI
SYMBOL
R
DS(ON)
CONDITIONS
V
OUT
= +3.3V,
I
LX
= 100mA
MAX1795
I
LIM
I
LEAK
R
DAMP
V
FB
= +1.4V
V
FB
= +1.4V, V
LBI
= +1V
SHDN = BATT, V
LBI
= +1V
V
FB
= +1V, if current limit not reached
V
FB
= +1V
V
BATT
= +2V
V
BATT
= LBI
V
LBI
= +0.8V
V
BATT
= V
LBI
= +0.975V,
sinking 20µA (50Ω typ)
V
BATT
= V
LBI
= +1.1V,
sinking 100µA (25Ω typ)
V
LBO
= +5.5V
V
IL
SHDN Input Voltage
V
IH
Shutdown Input Current
V
SHDN
= 0 and +5.5V
0.8 x
V
BATT
100
2.75
0.7
0.8
0.875
MAX1796
MAX1797
V
LX
= 0 and +5.5V, V
OUT
= +5.5V
100
400
45
4
4
5.25
1.3
0.90
0.975
100
0.1
V
0.1
100
V
BATT
0.2 x
nA
NFET
PFET
0.19
0.35
0.8
MIN
MAX
0.3
0.45
0.37
0.7
1.32
µA
Ω
µA
µA
µA
µs
µs
V
nA
A
UNITS
Ω
LBO Low Output Voltage
LBO Off-Leakage Current
V
nA
Note 1:
Operating Voltage: Since the regulator is bootstrapped to the output, once started it will operate down to a 0.7V input.
Note 2:
Device is bootstrapped (power to IC comes from OUT). This correlates directly with the actual battery supply current.
Note 3:
Specifications to -40°C are guaranteed by design, not production tested.
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