Rainbow Electronics MAX723 - Manual (Page 2)

MAX756/MAX757
3.3V/5V/Adjustable-Output,
Step-Up DC-DC Converters
2 _______________________________________________________________________________________
Supply Voltage (OUT to GND) ....................................-0.3V, +7V
Switch Voltage (LX to GND) ........................................-0.3V, +7V
Auxiliary Pin Voltages (SHDN, LBI, LBO, REF,
3/5, FB to GND) ........................................-0.3V, (V OUT + 0.3V)
Reference Current (I
REF
) ....................................................2.5mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW
SO (derate 5.88mW/°C above +70°C) ..........................471mW
Operating Temperature Ranges:
MAX75_C_ _ ........................................................0°C to +70°C
MAX75_E_ _......................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range............................... -65°to +160°C
Lead Temperature (soldering, 10sec) ........................... +300°C
ELECTRICAL CHARACTERISTICS
(Circuits of Figure 1 and Typical Operating Circuit, V
IN
= 2.5V, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
, 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.
ABSOLUTE MAXIMUM RATINGS
Note 1: Supply current from the 3.3V output is measured with an ammeter between the 3.3V 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 2: Minimum value is production tested. Maximum value is guaranteed by design and is not production tested.
LBO Output Leakage Current
SHDN, 3/5, FB, LBI Input Current
V 2.7 5.5 MAX757, I
LOAD
= 0mA (Note 2) Output Voltage Range
V 1.22 1.25 1.28 MAX757 FB Voltage
nA ±100
LBI = 1.25V, FB = 1.25V, SHDN = 0V or 3V,
3/5 = 0V or 3V
V 1.6 SHDN, 3/5 Input Voltage High
V 0.4 SHDN, 3/5 Input Voltage Low
Shutdown Quiescent Current
(Note 1)
Battery Quiescent Current
Measured at V
IN
in Figure 1
V 1.22 1.25 1.28 With falling edge LBI Input Threshold
mV 25 LBI Input Hysteresis
V 0.4 I
SINK
= 2mA LBO Output Voltage Low
µA 1 LBO = 5V
µA 20 40
SHDN = 0V, LBI = 1.25V, 3/5 = 3V, V
OUT
= 3.47V,
FB = 1.3V (MAX757 only)
µA
Quiescent Supply Current in
3.3V Mode (Note 1)
MAX757, V
OUT
= 5V, 0mA < I
LOAD
< 200mA
MAX756, 3/5 = 0V, 0mA < I
LOAD
< 200mA
MAX756, 3/5 = 3V, 0mA < I
LOAD
< 300mA
% 0.8 2.0 3/5 = 3V, -20µA < REF load < 250µA, C REF = 0.22µF Reference-Voltage Regulation
V 1.23 1.25 1.27 No REF load, C REF = 0.1µF
60
I
LOAD
= 0mA, 3/5 = 3V, LBI = 1.25V, V
OUT
= 3.47V,
FB = 1.3V (MAX757 only)
µA
V
60 Output set for 3.3V
1.1 1.8 I
LOAD
= 10mA Minimum Start-Up Supply Voltage
4.8 5.0 5.2
2V < V
IN
< 3V
Reference Voltage
3.17 3.30 3.43 V
4.8 5.0 5.2
Output Voltage
UNITS MIN TYP MAX CONDITIONS PARAMETER
V 0.7 I
LOAD
= 20mA
Minimum Operating Supply
Voltage (once started)