Datasheet

(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)
(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)
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).
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Shutdown Current into BATT MAX1724 (Note 4)
T
A
= +25°C 0.001 0.5
µA
T
A
= +85°C 0.01
SHDN Voltage Threshold
V
IL
MAX1723/MAX1724 75 400
mV
V
IH
MAX1723/MAX1724 500 800
SHDN Input Bias Current
MAX1723/MAX1724,
V
SHDN
= 5.5V
T
A
= +25°C 2 100
nA
T
A
= +85°C 7
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Voltage V
OUT
MAX1724E__27 2.633 2.767
V
MAX1724E__30 2.925 3.075
MAX1724E__33 3.218 3.383
MAX1724E__50 4.875 5.125
Output Voltage Range V
OUT
MAX1722/MAX1723 2 5.5 V
Feedback Voltage V
FB
MAX1722/MAX1723 1.200 1.270 V
N-Channel On-Resistance R
DS(ON)
V
OUT
forced to 3.3V 1.0 Ω
P-Channel On-Resistance R
DS(ON)
V
OUT
forced to 3.3V 2.0 Ω
N-Channel Switch Current Limit I
LIM
V
OUT
forced to 3.3V 400 620 mA
Switch Maximum On-Time t
ON
3.5 6.5 µs
Synchronous Rectier Zero-
Crossing Current
V
OUT
forced to 3.3V 5 35 mA
Quiescent Current into OUT (Notes 3,4) 3.6 µA
SHDN Voltage Threshold
V
IL
MAX1723/MAX1724 75
mV
V
IH
MAX1723/MAX1724 800
MAX1722/MAX1723/
MAX1724
1.5μA I
Q
, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com
Maxim Integrated │ 3
Electrical Characteristics
Electrical Characteristics (continued)