Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3426
TYPICAL PERFORMANCE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Start-Up from Shutdown
RUN
2V/DIV
V
OUT
2V/DIV
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
Load Step
V
OUT
100mV/DIV
AC COUPLED
Load Step
I
L
500mA/DIV
I
LOAD
500mA/DIV
V
IN
= 3.6V
20µs/DIV
V
OUT
= 1.8V
I
LOAD
= 0mA TO 800mA
I
LOAD
500mA/DIV
I
LOAD
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 800mA
40µs/DIV
V
IN
= 3.6V
20µs/DIV
V
OUT
= 1.8V
I
LOAD
= 50mA TO 800mA
Load Step
V
OUT
100mV/DIV
AC COUPLED
Load Step
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
I
L
500mA/DIV
I
LOAD
500mA/DIV
V
IN
= 3.6V
20µs/DIV
V
OUT
= 1.8V
I
LOAD
= 100mA TO 800mA
I
LOAD
500mA/DIV
V
IN
= 3.6V
20µs/DIV
V
OUT
= 1.8V
I
LOAD
= 200mA TO 800mA
PIN FUNCTIONS
RUN (Pin 1):
Run Control Input. Forcing this pin above
1.5V enables the part. Forcing this pin below 0.3V shuts
down the device. In shutdown, all functions are disabled
drawing <1µA supply current. Do not leave RUN floating.
GND (Pin 2):
Ground Pin.
SW (Pin 3):
Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchro-
nous power MOSFET switches.
V
IN
(Pin 4):
Main Supply Pin. Must be closely decoupled
to GND, Pin 2, with a 2.2µF or greater ceramic capacitor.
V
FB
(Pin 5) (kB3426):
Feedback Pin. Receives the feed-
back voltage from an external resistive divider across the
output.
V
OUT
(Pin 5) (kB3426-1.8/kB3426-3.3):
Output Volt-
age Feedback Pin. An internal resistive divider divides the
output voltage down for comparison to the internal refer-
ence voltage.
5
KINGBOR [ KINGBOR TECHNOLOGY CO ]
