MAX756EPA

Manufacturer Part NumberMAX756EPA
DescriptionDC/DC Switching Converters 3.3/5/AdjV-Out Step Up DC/DC Converter
ManufacturerMaxim Integrated Products
MAX756EPA datasheets

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3.3V/5V/Adjustable-Output,
Step-Up DC-DC Converters
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
= +25°C, unless otherwise noted.)
A
LOAD-TRANSIENT RESPONSE
OUTPUT
VOLTAGE
50mV/div
OUTPUT
CURRENT
0mA to 200mA
V
= 2.5V
IN
HORIZONTAL = 50 s/div
5V Mode
______________________________________________________________Pin Description
PIN
NAME
MAX756
MAX757
Shutdown Input disables SMPS when low, but the voltage reference and low-battery com-
1
1
SHDN
parator remain active.
2
–
3/5
Selects the main output voltage setting; 5V when low, 3.3V when high.
Feedback Input for adjustable output operation. Connect to an external voltage divider
–
2
FB
between OUT and GND.
1.25V Reference Voltage Output. Bypass with 0.22µF to GND (0.1µF if there is no external
3
3
REF
reference load). Maximum load capability is 250µA source, 20µA sink.
Low-Battery Output. An open-drain N-channel MOSFET sinks current when the voltage at
4
4
LBO
LBI drops below +1.25V.
Low-Battery Input. When the voltage on LBI drops below +1.25V, LBO sinks current.
5
5
LBI
Connect to V
Connect OUT to the regulator output. It provides bootstrapped power to both devices,
6
6
OUT
and also senses the output voltage for the MAX756.
7
7
GND
Power Ground. Must be low impedance; solder directly to ground plane.
8
8
LX
1A, 0.5Ω N-Channel Power MOSFET Drain
4
_______________________________________________________________________________________
START-UP DELAY
V
SHDN
2V/div
V
OUT
2V/div
V
= 2.5V
IN
HORIZONTAL = 5ms/div
5V Mode
FUNCTION
if not used.
IN
3V
0V
5V
0V

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