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
= 1.2V, V
OUT
= 3.3V (MAX1722/MAX1723), V
OUT
= V
OUT(NOM)
(MAX1724),
SHDN
= OUT, R
L
= ∞,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Minimum Input Voltage
Operating Input Voltage
Minimum Start-Up Input Voltage
V
IN
SYMBOL
T
A
= +25°C
T
A
= +25°C,
R
L
= 3kΩ
MAX1724E__27
MAX1724E__30
Output Voltage
V
OUT
MAX1724E__33
MAX1724E__50
Output Voltage Range
Feedback Voltage
Feedback Bias Current
N-Channel On-Resistance
P-Channel On-Resistance
N-Channel Switch Current Limit
Switch Maximum On-Time
Synchronous Rectifier Zero-
Crossing Current
Quiescent Current into OUT
Shutdown Current into OUT
Quiescent Current into BATT
V
OUT
V
FB
I
FB
R
DS(ON)
R
DS(ON)
I
LIM
t
ON
MAX1722/MAX1723
MAX1722/MAX1723
MAX1722/MAX1723
V
OUT
forced to 3.3V
V
OUT
forced to 3.3V
V
OUT
forced to 3.3V
V
OUT
forced to 3.3V
(Notes 3, 4)
MAX1723/MAX1724
(Notes 3, 4)
MAX1722/MAX1724
(Note 4)
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
CONDITIONS
MAX1722/MAX1724
MAX1722/MAX1724
MAX1723 (Note 2)
MAX1722/MAX1724
MAX1723 (Note 2)
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
2.673
2.633
2.970
2.925
3.267
3.218
4.950
4.875
2
1.223
1.210
1.5
2.2
0.5
1.0
400
3.5
5
500
5
20
1.5
0.01
0.1
0.001
0.01
0.5
1.0
2.0
600
6.5
35
3.6
0.5
1.235
5.0
3.3
3.0
T
A
= 0°C to +85°C
T
A
= 0°C to +85°C
T
A
= 0°C to +85°C
T
A
= 0°C to +85°C
0.91
1.2
0.83
0.87
2.7
MIN
TYP
0.8
5.5
5.5
0.91
1.2
2.727
2.767
3.030
3.075
3.333
3.383
5.050
5.125
5.5
1.247
1.260
20
V
V
nA
Ω
Ω
mA
µs
mA
µA
µA
µA
V
MAX
UNITS
V
V
V
T
A
= +25°C
T
A
= +25°C
T
A
= 0°C to +85°C
T
A
= +85°C
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Maxim Integrated
│
2
MAX1722/MAX1723/
MAX1724
Electrical Characteristics (continued)
1.5μA I
Q
, Step-Up DC-DC
Converters in TSOT and µDFN
(V
BATT
= 1.2V, V
OUT
= 3.3V (MAX1722/MAX1723), V
OUT
= V
OUT(NOM)
(MAX1724),
SHDN
= OUT, R
L
= ∞,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Shutdown Current into BATT
SHDN
Voltage Threshold
SHDN
Input Bias Current
V
IH
V
IL
SYMBOL
CONDITIONS
MAX1724 (Note 4)
MAX1723/MAX1724
MAX1723/MAX1724
MAX1723/MAX1724,
V
SHDN
= 5.5V
T
A
= +85°C
T
A
= +25°C
T
A
= +25°C
T
A
= +85°C
75
MIN
TYP
0.001
0.01
400
500
2
7
800
100
MAX
0.5
UNITS
µA
mV
nA
Electrical Characteristics
(V
BATT
= 1.2V, V
OUT
= 3.3V (MAX1722/MAX1723), V
OUT
= V
OUT(NOM)
(MAX1724),
SHDN
= OUT, R
L
= ∞, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
Output Voltage
Output Voltage Range
Feedback Voltage
N-Channel On-Resistance
P-Channel On-Resistance
N-Channel Switch Current Limit
Switch Maximum On-Time
Synchronous Rectifier Zero-
Crossing Current
Quiescent Current into OUT
SHDN
Voltage Threshold
V
IH
V
IL
SYMBOL
V
OUT
V
OUT
R
DS(ON)
R
DS(ON)
I
LIM
t
ON
V
FB
CONDITIONS
MAX1724E__27
MAX1724E__30
MAX1724E__33
MAX1724E__50
MAX1722/MAX1723
MAX1722/MAX1723
V
OUT
forced to 3.3V
V
OUT
forced to 3.3V
V
OUT
forced to 3.3V
V
OUT
forced to 3.3V
(Notes 3,4)
MAX1723/MAX1724
MAX1723/MAX1724
75
800
400
3.5
5
MIN
2.633
2.925
3.218
4.875
2
1.200
TYP
MAX
2.767
3.075
3.383
5.125
5.5
1.270
1.0
2.0
620
6.5
35
3.6
V
V
Ω
Ω
mA
µs
mA
µA
mV
V
UNITS
Note 1:
Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:
Guaranteed with the addition of a Schottky MBR0520L external diode between LX and OUT when using the MAX1723 with
only one cell, and assumes a 0.3V voltage drop across the Schottky diode (see Figure 3).
Note 3:
Supply current is measured with an ammeter between the output and OUT pin. This current correlates directly with actual
battery supply current, but is reduced in value according to the step-up ratio and efficiency.
Note 4:
V
OUT
forced to the following conditions to inhibit switching: V
OUT
= 1.05 x V
OUT(NOM)
(MAX1724), V
OUT
= 3.465V
(MAX1722/MAX1723).
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Maxim Integrated
│
3
MAX1722/MAX1723/
MAX1724
Typical Operating Characteristics
1.5μA I
Q
, Step-Up DC-DC
Converters in TSOT and µDFN
(Figure 3 (MAX1723), Figure 7 (MAX1722), Figure 8 (MAX1724), V
BATT
= V
IN
= 1.5V, L = 10μH, C
IN
= 10μF, C
OUT
= 10μF, T
A
= +25°C,
unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5.0V)
MAX1722 toc01
MAX1722 toc02
90
EFFICIENCY (%)
80
70
60
V
IN
= 2.0V
V
IN
= 3.3V
V
IN
= 4.0V
90
EFFICIENCY (%)
80
70
60
50
V
IN
= 2.0V
V
IN
= 2.5V
90
EFFICIENCY (%)
80
70
60
50
V
IN
= 1.0V
0.01
0.1
1
10
L = DO1606
100
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
= 1.0V
V
IN
= 1.5V
L = DO1606
10
100
1000
V
IN
= 1.0V
V
IN
= 1.5V
0.01
0.1
1
10
L = DO1606
100
1000
50
0.01
0.1
1
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX1722 toc04
MAX1722 toc05
QUIESCENT CURRENT (µA)
STARTUP VOLTAGE (V)
160
I
OUT(MAX)
(mA)
120
80
V
OUT
= 2.5V
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
RESISTIVE LOAD
V
OUT
= 5.0V
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
NO LOAD
V
OUT
= 5.0V
V
OUT
= 3.3V
40
0
0
1
2
3
4
5
0.6
0.01
0.1
INPUT VOLTAGE (V)
10
LOAD CURRENT (mA)
1
100
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
OUTPUT VOLTAGE (V)
STARTUP VOLTAGE vs.
TEMPERATURE
NO LOAD
MAX1722 toc07
SWITCHING WAVEFORMS
MAX1722 toc08
1.2
1.0
STARTUP VOLTAGE (V)
0.8
0.6
0.4
0.2
0
I
LX
500mA/div
V
OUT
50mV/div
V
LX
2V/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
1µs/div
I
OUT
= 50mA, V
OUT
= 5.0V, V
IN
= 3.3V
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Maxim Integrated
│
4
MAX1722 toc06
200
2.4
STARTUP VOLTAGE
vs. LOAD CURRENT
2.0
QUIESCENT CURRENT INTO OUT
vs. OUTPUT VOLTAGE
MAX1722 toc03
100
100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V)
100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.5V)
MAX1722/MAX1723/
MAX1724
Typical Operating Characteristics (continued)
1.5μA I
Q
, Step-Up DC-DC
Converters in TSOT and µDFN
(Figure 3 (MAX1723), Figure 7 (MAX1722), Figure 8 (MAX1724), V
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