LTC3407A LINER [Linear Technology], LTC3407A Datasheet - Page 5

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

TYPICAL PERFORMANCE CHARACTERISTICS
PIN FUNCTIONS
V
age from the external resistive divider across the output.
Nominal voltage for this pin is 0.6V.
RUN/SS1 (Pin 2): Regulator 1 Enable and Soft-Start Input.
Forcing this pin to V
to GND causes regulator 1 to shut down. Connect external
RC-network with desired time-constant to enable soft-start
feature. This pin must be driven; do not fl oat.
V
to GND.
FB1
IN
100
100
(Pin 3): Main Power Supply. Must be closely decoupled
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
(Pin 1): Output Feedback. Receives the feedback volt-
1
1
Effi ciency vs Load Current
Effi ciency vs Load Current
V
CIRCUIT OF FIGURE 3
V
2.7V
2.7V
OUT
OUT
= 2.5V Burst Mode OPERATION
= 1.2V Burst Mode OPERATION
4.2V
LOAD CURRENT (mA)
LOAD CURRENT (mA)
10
10
3.3V
4.2V
IN
enables regulator 1, while forcing it
100
100
3.3V
3407A G11
3407A G14
1000
1000
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
1
Effi ciency vs Load Current
1
Effi ciency vs Load Current
V
NO LOAD ON OTHER CHANNEL
Burst Mode OPERATION
V
2.7V
IN
OUT
4.2V
= 3.6V, V
PULSE SKIP MODE
= 1.5V Burst Mode OPERATION
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUT
3.3V
10
10
= 1.8V
SW1 (Pin 4): Regulator 1 Switch Node Connection to the
Inductor. This pin swings from V
GND (Pin 5): Main Ground. Connect to the (–) terminal
of C
MODE/SYNC (Pin 6): Combination Mode Selection and
Oscillator Synchronization. This pin controls the opera-
tion of the device. When tied to V
operation or pulse skipping mode is selected, respectively.
Do not fl oat this pin. The oscillation frequency can be
synchronized to an external oscillator applied to this pin
and pulse skipping mode is automatically selected.
OUT
100
100
, and (–) terminal of C
3407A G12
T
3407A G15
A
1000
1000
= 25°C unless otherwise specifi ed.
–0.1
–0.2
–0.3
–0.4
–0.5
0.5
0.4
0.3
0.2
0.1
–1
–2
–3
–4
4
3
2
1
0
0
1
2
Load Regulation
Line Regulation
PULSE SKIP MODE
Burst Mode OPERATION
V
NO LOAD ON OTHER CHANNEL
V
I
OUT
IN
OUT
= 3.6V, V
= 200mA
IN
= 1.8V
.
3
IN
LOAD CURRENT (mA)
IN
OUT
10
to GND.
or GND, Burst Mode
LTC3407A
= 1.8V
V
IN
4
(V)
100
5
3407A G13
3407A G16
3407afa
5
1000
6