LTC3407-4 Linear Technology, LTC3407-4 Datasheet - Page 5

• Manufacturer Part Number: LTC3407-4
• Description: Dual Synchronous 800mA 2.25MHz Step-Down DC/DC Regulator
• Manufacturer: Linear Technology

PI FU CTIO S
V
voltage from the external resistive divider across the
output. Nominal voltage for this pin is 0.6V.
RUN1 (Pin 2): Regulator 1 Enable. Forcing this pin to V
enables regulator 1, while forcing it to GND causes regu-
lator 1 to shut down. This pin must be driven; do not float.
V
to GND.
SW1 (Pin 4): Regulator 1 Switch Node Connection to the
Inductor. This pin swings from V
GND (Pin 5): Ground. Connect to the (–) terminal of C
and (–) terminal of C
MODE/SYNC (Pin 6): Combination Mode Selection and
Oscillator Synchronization. This pin controls the operation
of the device. When tied to V
operation or pulse skipping mode is selected, respec-
tively. Do not float this pin. The oscillation frequency can
TYPICAL PERFOR A CE CHARACTERISTICS
FB1
IN
100
U
90
80
70
60
50
40
30
20
10
(Pin 3): Main Power Supply. Must be closely decoupled
0
1
Efficiency vs Load Current
(Pin 1): Output Feedback. Receives the feedback
V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
OUT
= 1.2V
U
V
IN
= 3.6V
LOAD CURRENT (mA)
10
V
U
IN
IN
= 4.2V
.
V
IN
100
= 2.7V
W
34074 G13
IN
IN
U
1000
or GND, Burst Mode
to GND.
100
90
80
70
60
1
Efficiency vs Load Current
V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
OUT
= 1.5V
V
IN
OUT
= 3.6V
LOAD CURRENT (mA)
IN
10
,
V
IN
be syncronized to an external oscillator applied to this pin
and pulse skipping mode is automatically selected.
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.
RUN2 (Pin 9): Regulator 2 Enable. Forcing this pin to V
enables regulator 2, while forcing it to GND causes regu-
lator 2 to shut down. This pin must be driven; do not float.
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
connected to electrical ground on PCB.
= 4.2V
FB2
V
100
IN
(Pin 10): Output Feedback. Receives the feedback
= 2.7V
34074 G14
1000
OUT
–1.0
–0.2
–0.4
–0.6
–0.8
0.8
0.6
0.4
0.2
, and (–) terminal of C
0
Line Regulation
2
V
I
T
OUT
A
OUT
= 25°C
= 200mA
= 1.8V
www.DataSheet4U.com
3
IN
LTC3407-4
to GND.
V
IN
4
(V)
IN
16
. Must be
5
of clock
34074 G15
34074f
5
IN
6