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LTC3547BEDDB-1#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3547B
4
3547bfb
V
IN
(V)
2.5
R
DS(ON)
(Ω)
4
3547b G08
0.9
0.8
0.6
3 3.5 4.5
0.5
0.4
1.0
0.7
5 5.5 6
SYNCHRONOUS
SWITCH
MAIN SWITCH
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
1.2
1.1
25
3547b G09
0.8
0.6
–25 0 50
0.5
0.4
1.3
1.0
0.9
0.7
75 100 125
MAIN SWITCH
SYNCHRONOUS
SWITCH
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3547b G10
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 1.2V
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3547b G11
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 1.8V
TEMPERATURE (°C)
–50
V
FB
(% ERROR)
25
3547b G07
0.5
–0.5
–25 0 50
–1.0
–1.5
1.5
1.0
0
75 100
Reference Voltage
vs Temperature
R
DS(ON)
vs Input Voltage
R
DS(ON)
vs Temperature
Effi ciency vs Load Current
Effi ciency vs Load Current
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
2.5
25
3547b G04
2.2
2.0
–25 0 50
1.9
1.8
2.6
2.4
2.3
2.1
75 100 125
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 2.7V
TEMPERATURE (°C)
–50
LEAKAGE CURRENT (nA)
25
3547b G05
40
20
–25 0 50
10
0
50
30
75 100 125
SYNCHRONOUS
SWITCH
MAIN SWITCH
V
IN
(V)
2.5
LEAKAGE CURRENT (pA)
4
3547b G06
400
200
3 3.5 4.5
100
0
500
300
5 5.5 6
SYNCHRONOUS
SWITCH
MAIN SWITCH
Oscillator Frequency
vs Temperature
Switch Leakage vs Temperature
Switch Leakage vs Input Voltage
LTC3547B
5
3547bfb
LOAD CURRENT (mA)
0
V
OUT
ERROR (%)
150
3547b G13
0.8
0.6
0.2
50 100 200
0
–0.2
1.2
1.O
0.4
250 300 350
PULSE SKIP MODE
OPERATION
V
IN
= 3.6V V
OUT
= 1.2V
V
OUT
= 1.8V
V
OUT
= 2.5V
V
IN
(V)
2.5
V
OUT
ERROR (%)
4
3547b G14
0.4
0.2
–0.2
3 3.5 4.5
–0.4
–0.6
0.6
0
5 5.5
V
OUT
= 1.8V
I
LOAD
= 100mA
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3547b G12
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 2.5V
200μs/DIV
I
L
100mA/DIV
RUN
2V/DIV
V
OUT
1V/DIV
3547b G15
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0A
Effi ciency vs Load Current
Load Regulation
Line Regulation
Start-Up From Shutdown
Start-Up From Shutdown
Load Step
Load Step
Load Step
TYPICAL PERFOR A CE CHARACTERISTICS
UW
250μs/DIV
I
L
200mA/DIV
RUN
2V/DIV
V
OUT
1V/DIV
3547b G16
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 300mA
10μs/DIV
I
L
200mA/DIV
I
LOAD
200mA/DIV
V
OUT
,
AC-COUPLED
100mV/DIV
3547b G19
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA TO 300mA
10μs/DIV
I
L
200mA/DIV
I
LOAD
200mA/DIV
V
OUT
,
AC-COUPLED
100mV/DIV
3547b G18
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 20mA TO 300mA
10μs/DIV
I
L
200mA/DIV
I
LOAD
200mA/DIV
V
OUT
,
AC-COUPLED
100mV/DIV
3547b G17
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0mA TO 300mA
LTC3547B
6
3547bfb
PI FU CTIO S
UUU
V
FB1
(Pin 1): Regulator 1 Output Feedback. Receives
the feedback voltage from the external resistor divider
across the regulator 1 output. Nominal voltage for this
pin is 0.6V.
RUN1 (Pin 2): Regulator 1 Enable. Forcing this pin to
V
IN
enables regulator 1, while forcing it to GND causes
regulator 1 to shut down.
V
IN
(Pin 3): Main Power Supply. Must be closely decou-
pled to GND.
SW1 (Pin 4): Regulator 1 Switch Node Connection to the
Inductor. This pin swings from V
IN
to GND.
GND (Pin 5): Ground. Connect to the (–) terminal of C
OUT
,
and the (–) terminal of C
IN
.
SW2 (Pin 6): Regulator 2 Switch Node Connection to
the Inductor. This pin swings from V
IN
to GND.
RUN2 (Pin 7): Regulator 2 Enable. Forcing this pin to
V
IN
enables regulator 2, while forcing it to GND causes
regulator 2 to shut down.
V
FB2
(Pin 8): Regulator 2 Output Feedback. Receives
the feedback voltage from the external resistor divider
across the regulator 2 output. Nominal voltage for this
pin is 0.6V.
Exposed Pad (Pin 9): Electrically Connected to GND.
Must be soldered to the PCB for optimum thermal
performance.
–
+
–
+
EA
–
+
V
SLEEP
I
TH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
S
R
Q
Q
RS
LATCH
PULSE SKIP
–
+
I
COMP
I
RCMP
ANTI
SHOOT-
THRU
SLOPE
COMP
SLEEP
0.6V REF OSC
OSC
REGULATOR 2 (IDENTICAL TO REGULATOR 1)
SHUTDOWN
REGULATOR 1
SW1
SW2
5Ω
3547 FD
1
2
7
8
RUN1
RUN2
V
FB2
V
FB1
4
V
IN
3
GND
5
6
0.6V
SOFT-START
FUNCTIONAL DIAGRAM
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3547BEDDB-1#TRMPBF

Mfr. #:
Buy LTC3547BEDDB-1#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual Monolithic 300mA Synch Step-Down Reg with fixed 1.2V & 1.8V outputs
Lifecycle:
New from this manufacturer.
Delivery:
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