MAX757CSA+ Maxim Integrated Products, MAX757CSA+ Datasheet - Page 4

• Manufacturer Part Number: MAX757CSA+
• Description: IC DC-DC CONV 8-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Step-Up (Boost)r

Specifications of MAX757CSA+

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 2.7 ~ 5.5 V
• Current - Output: 300mA
• Frequency - Switching: 500kHz
• Voltage - Input: 0.7 ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 471mW
• Output Voltage: 5.5 V
• Output Current: 0.3 mA
• Input Voltage: 5.5 V
• Supply Current: 0.06 A
• Switching Frequency: 500 KHz
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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