MAX730 Maxim, MAX730 Datasheet - Page 7

• Manufacturer Part Number: MAX730
• Description: 5V / Step-Down / Current-Mode PWM DC-DC Converters
• Manufacturer: Maxim

(Circuit of Figure 3, T
______________________________________________________________Pin Description
____________________________Typical Operating Characteristics (continued)
DIP/SO
8-PIN
1
2
3
4
5
6
7
8
A: V OUT , 50mV/div, DC-COUPLED
B: I OUT , 200mA/div, 20mA TO 300mA
V+ = 9V
PIN
WIDE SO
12, 13, 14
1, 15, 16
16-PIN
10, 11
4, 5, 6
LOAD-TRANSIENT RESPONSE
2
3
7
8
9
_______________________________________________________________________________________
A
= +25°C, unless otherwise noted.)
MAX730A
50ms/div
NAME
SHDN
GND
Current-Mode PWM DC-DC Converters
OUT
N.C.
REF
CC
V+
SS
LX
Shutdown—active low. Ground to power-down chip, tie to V+ for normal operation.
Output voltage falls to 0V when SHDN is low.
Reference-Voltage Output (+1.23V) supplies up to 100µA for extended loads.
Bypass to GND with a capacitor that does not exceed 0.047µF.
Soft-Start. Capacitor between SS and GND provides soft-start and short-circuit protection.
510kΩ resistor from SS to SHDN provides current boost.
Compensation Capacitor Input externally compensates the outer feedback loop.
Connect to OUT with a 330pF capacitor.
Output Voltage Sense Input provides regulation feedback sensing. Connect to +5V output.
Ground pins are internally connected. Connect both pins to ground.
Drain of internal P-channel power MOSFET.
Supply-Voltage Input. Bypass to GND with 1µF ceramic and large-value electrolytic capaci-
tors in parallel. The 1µF capacitor must be as close to V+ and GND pins as possible.
No Connect—no internal connections to these pins.
300mA
20mA
A
B
A: V OUT , 50mV/div, DC-COUPLED
B: I OUT , 500mA/div, 50mA TO 750mA
V+ = 12V
FUNCTION
LOAD-TRANSIENT RESPONSE
MAX738A/MAX744A
5V, Step-Down,
50ms/div
750mA
50mA
A
B
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