Typical operating characteristics (continued), Pin description – Rainbow Electronics MAX1734 User Manual
Page 5
MAX1733/MAX1734
Low-Voltage, Step-Down DC-DC Converters
in SOT23
_______________________________________________________________________________________
5
Typical Operating Characteristics (continued)
(C
IN
= 2.2µF ceramic, C
OUT
= 22µF tantalum, L = 10µH, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
MAX1733/4-12
4
µs/div
V
OUT
AC-COUPLED
50mV/div
I
LOAD
100mA/div
V
IN
= 3.6V, V
OUT
= 1.8V, I
LOAD
= 20mA TO 200mA
LIGHT-LOAD LINE-TRANSIENT RESPONSE
MAX1733/4-10
4
µs/div
V
OUT
AC-COUPLED
50mV/div
V
IN
AC-COUPLED
200mV/div
V
IN
= 3.4V TO 3.8V, V
OUT
= 1.8V, I
LOAD
= 20mA
HEAVY-LOAD LINE-TRANSIENT RESPONSE
MAX1733/4-11
4
µs/div
V
OUT
AC-COUPLED
50mV/div
V
IN
AC-COUPLED
200mV/div
V
IN
= 3.4V TO 3.8V, V
OUT
= 1.8V, I
LOAD
= 200mA
SOFT-START AND SHUTDOWN RESPONSE
MAX1733/4-09
200
µs/div
V
OUT
1V/div
V
IN
= 3.6V, V
OUT
= 1.8V, R
LOAD
= 7
Ω
V
SHDN
5V/div
I
IN
100mA/div
Pin Description
PIN
NAME
FUNCTION
1
IN
Supply Voltage Input. Input range from +2.7V to +5.5V. Bypass with a 2.2
µF ceramic capacitor to
GND.
2
GND
Ground
3
SHDN
Active-Low Shutdown Input. Connect SHDN to IN for normal operation. In shutdown, LX becomes
high impedance and quiescent current drops to 0.01
µA.
FB
MAX1733 Voltage Feedback Input. FB regulates to 1.25V nominal. Connect FB to an external
voltage-divider between the output voltage and GND.
4
OUT
MAX1734 Voltage Sense Input. OUT is connected to an internal voltage-divider.
5
LX
Inductor Connection