LTC3407A LINER [Linear Technology], LTC3407A Datasheet - Page 6

• Manufacturer Part Number: LTC3407A
• Description: Dual Synchronous 600mA, 1.5MHz Step-Down DC/DC Regulator
• Manufacturer: LINER [Linear Technology]

LTC3407A
PIN FUNCTIONS
SW2 (Pin 7): Regulator 2 Switch Node Connection to the
Inductor. This pin swings from V
POR (Pin 8): Power-On Reset. This common-drain logic
output is pulled to GND when the output voltage is not
within ±8.5% of regulation and goes high after 2
cycles when both channels are within regulation.
RUN/SS2 (Pin 9): Regulator 2 Enable and Soft-Start Input.
Forcing this pin to V
to GND causes regulator 2 to shut down. Connect external
BLOCK DIAGRAM
6
MODE/SYNC
RUN/SS1
RUN/SS2
V
V
FB1
FB2
10
2
9
6
1
IN
REGULATOR 1
0.6V REF
REGULATOR 2 (IDENTICAL TO REGULATOR 1)
enables regulator 2, while forcing it
0.55V
0.65V
0.6V
SHUTDOWN
+
–
–
+
+
–
UVDET
OVDET
OSC
EA
IN
to GND.
I
UV
OV
TH
OSC
0.65V
16
SLOPE
COMP
clock
S
R
LATCH
–
+
RS
BURST
Q
Q
EN
RC-Network with desired time-constant to enable soft-start
feature. This pin must be driven; do not fl oat.
V
voltage from the external resistive divider across the output.
Nominal voltage for this pin is 0.6V.
Exposed Pad (GND) (Pin 11): Power Ground. Connect to
the (–) terminal of C
soldered to electrical ground on PCB.
FB2
SWITCHING
BLANKING
COUNTER
CIRCUIT
SLEEP
LOGIC
POR
AND
(Pin 10): Output Feedback. Receives the feedback
PGOOD2
PGOOD1
–
I
COMP
SHOOT-
I
THRU
ANTI
RCMP
+
+
–
BURST
CLAMP
OUT
, and (–) terminal of C
5Ω
V
V
IN
IN
11
4
3
8
5
7
IN
SW1
GND
V
POR
GND
SW2
. Must be
IN
3407afa