LTC3548EDD(RevA) View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC3548EDD
(Rev.:RevA)
(Rev.:RevA)
Linear Technology
LTC3548EDD Datasheet PDF : 16 Pages
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LTC3548
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specified.
Efficiency vs Load Current
100
2.7V
3.6V
90
4.2V
80
70
60
VOUT = 2.5V, CHANNEL 1
50 Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
CIRCUIT OF FIGURE 3
40
1
10
100
LOAD CURRENT (mA)
1000
3548 G10
Efficiency vs Load Current
100
95
90 2.7V
85
80
3.6V
4.2V
75
70 VOUT = 1.5V, CHANNEL 1
65
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
60 CIRCUIT OF FIGURE 3
1
10
100
LOAD CURRENT (mA)
1000
3548 G14
Efficiency vs Load Current
100
95
90
85
2.7V
80
4.2V
75
70 VOUT = 1.2V, CHANNEL 1
65
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
60 CIRCUIT OF FIGURE 3
1
10
100
LOAD CURRENT (mA)
3.6V
1000
3548 G13
PIN FUNCTIONS
VFB1 (Pin 1): Output Feedback. Receives the feedback volt-
age 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 VIN
enables regulator 1, while forcing it to GND causes regulator
1 to shut down. This pin must be driven; do not float.
VIN (Pin 3): Main Power Supply. Must be closely decoupled
to GND.
SW1 (Pin 4): Regulator 1 Switch Node Connection to the
Inductor. This pin swings from VIN to GND.
GND (Pin 5): Main Ground. Connect to the (–) terminal
of COUT, and (–) terminal of CIN.
MODE/SYNC (Pin 6): Combination Mode Selection and
Oscillator Synchronization. This pin controls the opera-
tion of the device. When tied to VIN or GND, Burst Mode
operation or pulse skipping mode is selected, respectively.
Do not float this pin. The oscillation frequency can be
synchronized 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 VIN to GND.
POR (Pin 8): Power-On Reset . This common-drain logic
output is pulled to GND when the output voltage falls below
–8.5% of regulation and goes high after 117ms when both
channels are within regulation.
RUN2 (Pin 9): Regulator 2 Enable. Forcing this pin to VIN
enables regulator 2, while forcing it to GND causes regulator
2 to shut down. This pin must be driven; do not float.
VFB2 (Pin 10): Output Feedback. Receives the feedback
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 COUT, and (–) terminal of CIN. Must be
connected to electrical ground on PCB.
3548fa
5
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