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LTC3542EDC#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3542
4
3542fa
Start-Up from Shutdown Load Step
Reference Voltage
vs Temperature
Oscillator Frequency
vs Temperature
Oscillator Frequency
vs Supply Voltage
Output Voltage vs Supply Voltage
Output Voltage vs Load Current
R
DS(ON)
vs Input Voltage
RUN
2V/DIV
I
L
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 500mA
FIGURE 3a CIRCUIT
400μs/DIV
3542 G04
V
OUT
1V/DIV
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 30mA TO 500mA
FIGURE 3a CIRCUIT
20μs/DIV
3542 G05
I
LOAD
500mA/DIV
Load Step
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0mA TO 500mA
FIGURE 3a CIRCUIT
20μs/DIV
3542 G06
I
LOAD
500mA/DIV
TEMPERATURE (°C)
–50
V
REF
(V)
0.6100
0.6075
0.6050
0.6025
0.6000
0.5975
0.5950
0.5925
0.5900
0.5875
0.5850
0.5825
0.6125
0.6150
0
50
75
3542 G07
–25
25
100
125
INPUT VOLTAGE (V)
2
–0.5
V
OUT
ERROR (%)
–0.4
–0.2
–0.1
0
0.5
0.2
3
4
4.5
3542 G10
–0.3
0.3
0.4
0.1
2.5 3.5
5
5.5
6
V
OUT
= 1.8V
I
OUT
= 100mA
LOAD CURRENT (mA)
1
0
V
OUT
ERROR (%)
1.0
2.0
10 100 1000
3542 G11
–1.0
–0.5
0.5
1.5
–1.5
–2.0
Burst Mode
OPERATION
V
IN
= 3.6V
V
OUT
= 1.8V
PULSE SKIP
MODE
V
IN
(V)
1
0
R
DS(ON)
( )
0.1
0.3
0.4
0.5
5
0.9
3542 G12
0.2
32647
0.6
0.7
0.8
SYNCHRONOUS
SWITCH
MAIN SWITCH
TEMPERATURE (°C)
–50 –30 –10 10 30 50 70 90 110
1.8
FREQUENCY (MHz)
1.9
2.1
2.2
2.3
2.7
3542 G08
2.0
2.4
2.5
2.6
SUPPLY VOLTAGE (V)
FREQUENCY (MHz)
2.2
2.3
2.4
56
3542 G09
2.1
2.0
1.8
2
3
4
1.9
2.7
2.5
2.6
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise specifi ed.
LTC3542
5
3542fa
R
DS(ON)
vs Temperature
Switch Leakage vs Input Voltage
Effi ciency vs Input Voltage
TEMPERATURE (°C)
–50
0
R
DS(ON)
(Ω)
0.1
0.3
0.4
0.5
50
0.9
3542 G13
0.2
0
–25
75 100
25 125
0.6
0.7
0.8
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
SYNCHRONOUS
SWITCH
MAIN SWITCH
Switch Leakage vs Temperature
TEMPERATURE (°C)
–50
SWITCH LEAKAGE (nA)
200
250
300
25 75
3542 G15
150
100
–25 0
50 100 125
50
0
MAIN SWITCH
SYNCHRONOUS SWITCH
V
IN
(V)
0
0
LEAKAGE CURRENT (pA)
200
400
600
1
2
34
3542 G14
5
800
1000
100
300
500
700
900
6
SYNCHRONOUS
SWITCH
MAIN SWITCH
INPUT VOLTAGE (V)
2.5
100
90
80
70
60
50
40
30
45
3542 G16
3 3.5
4.5 5.5
EFFICIENCY (%)
I
OUT
= 500mA
I
OUT
= 100mA
I
OUT
= 10mA
I
OUT
= 1mA
I
OUT
= 0.1mA
V
OUT
= 1.8V
Burst Mode OPERATION
FIGURE 3a CIRCUIT
Effi ciency vs Load Current
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3542 G17
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 1.8V
Burst Mode OPERATION
FIGURE 3a CIRCUIT
Effi ciency vs Load Current Effi ciency vs Load Current
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3542 G18
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 1.2V
Burst Mode OPERATION
FIGURE 3a CIRCUIT
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3542 G19
0
1
Burst Mode
OPERATION
V
IN
= 3.6V
V
OUT
= 1.8V
FIGURE 3a CIRCUIT
PULSE SKIP
MODE
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise specifi ed.
LTC3542
6
3542fa
–
+
+
–
+
–
+
–
+
0.6V
EA
V
B
V
FB
V
IN
SW
MODE/SYNC
RUN
V
IN
SHUTDOWN
BURST
MODE
CLKIN
I
COMP
SLOPE COMPENSATION
ANTI-
SHOOT
THROUGH
MODE
DETECT
0.6V REF
OSC
GND
3542 BD
I
RCMP
LOGIC
V
FB
(Pin 1/Pin 3): Output Feedback Pin. Receives the
feedback voltage from an external resistive divider across
the output. Nominal voltage for this pin is 0.6V.
V
IN
(Pin 2/Pin 1): Power Supply Pin. Must be closely
decoupled to GND.
GND (Pin 3/Pin 2): Ground Pin.
SW (Pin 4/Pin 6): Switch Node Connection to Inductor.
This pin connects to the drains of the internal main and
synchronous power MOSFET switches.
MODE/SYNC (Pin 5/Pin 5): Mode Selection and Oscillator
Synchronization Pin. This pin controls the operation of the
device. When tied to GND or V
IN
, Burst Mode 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.
RUN (Pin 6/Pin 4): Converter Enable Pin. Forcing this pin
above 1.5V enables this part, while forcing it below 0.3V
causes the device to shut down. In shutdown, all functions
are disabled drawing <1μA supply current. This pin must
be driven; do not fl oat.
GND (Pin 7, DFN Package Only): Exposed Pad. The Ex-
posed Pad is ground. It must be soldered to PCB ground
to provide both electrical contact and optimum thermal
performance.
PIN FUNCTIONS
(DFN/TSOT-23)
BLOCK DIAGRAM
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3542EDC#TRMPBF

Mfr. #:
Buy LTC3542EDC#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 500mA, 2.25MHz Sync Buck DC/DC Conv
Lifecycle:
New from this manufacturer.
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