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LTC3568EDD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC3568
4
3568fa
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 100mA
V
OUT
10mV/
DIV
I
L
500mA/
DIV
S
W
2V/DIV
10µs/DIV
3568 G01
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 100mA
V
OUT
10mV/
DIV
I
L
200mA/
DIV
S
W
2V/DIV
2µs/DIV
3568 G02
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 100mA
V
OUT
10mV/
DIV
I
L
500mA/
DIV
2µs/DIV
3568 G03
S
W
2V/DIV
Typical perForMance characTerisTics
Burst Mode Operation
Pulse Skipping Mode
Forced Continuous Mode
Efficiency
vs Load Current
Efficiency vs V
IN
Load Step
LOAD CURRENT (mA)
EFFICIENCY (%)
100
95
90
85
80
75
70
1 100 1000 10000
3568 G04
10
V
IN
= 3.3V
V
OUT
= 2.5V
CIRCUIT OF FIGURE 7
Burst Mode
OPERATION
PULSE SKIP
FORCED CONTINUOUS
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 180mA TO 1.8A
V
OUT
100mV/
DIV
I
L
1A/
DIV
50µs/DIV
3568 G06
1 10 100 1000 10000
LOAD CURRENT (mA)
V
OUT
ERROR (%)
3568 G07
Burst Mode
OPERATION
PULSE SKIP
FORCED
CONTINUOUS
V
IN
= 3.3V
V
OUT
= 1.8V
0.6
0.5
0.4
0.3
0.2
0.1
–0.4
–0.3
–0.2
–0.1
0
2.0 3.0 4.0 5.02.5 3.5 4.5 5.5 6.0
V
IN
(V)
V
OUT
ERROR (%)
0.20
0.15
0.10
0.05
–0.20
–0.15
–0.10
–0.05
0
3568 G08
V
OUT
= 1.8V
I
OUT
= 1.8A
I
OUT
= 500mA
2 3 4 5 6
V
IN
(V)
FREQUENCY VARIATION (%)
10
8
6
4
2
0
–2
–4
–6
–8
–10
3568 G09
V
OUT
= 1.8V
I
OUT
= 1.25A
T
A
= 25°C
Load Regulation
Line Regulation
Frequency vs V
IN
LTC3568
5
3568fa
2.5 3 3.5 4 4.5 5 5.5 6
V
IN
(V)
R
DS(ON)
(mΩ)
120
115
110
105
100
95
90
3568 G12
MAIN SWITCH
SYNCHRONOUS SWITCH
T
A
= 25°C
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
REFERENCE VARIATION (%)
10
8
6
4
2
0
–2
–4
–6
–8
–10
3568 G10
FREQUENCY (MHz)
0
85
EFFICIENCY (%)
90
95
100
1 2
3568 G11
3 4
V
IN
= 3.3V
V
OUT
= 2.5V
I
OUT
= 500mA
T
A
= 25°C
Typical perForMance characTerisTics
Frequency Variation
vs Temperature
Efficiency vs Frequency
R
DS(ON)
vs V
IN
R
DS(ON)
vs Temperature
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
R
DS(ON)
160
150
140
130
120
110
100
90
80
70
60
3568 G13
V
IN
= 3.3V
V
IN
= 2.5V
V
IN
= 5V
MAIN SWITCH
SYNCHRONOUS SWITCH
LTC3568
6
3568fa
pin FuncTions
SHDN/R
T
(Pin 1): Combination Shutdown and Timing
Resistor Pin. The oscillator frequency is programmed by
connecting a resistor from this pin to ground. Forcing
this pin to SV
IN
causes the device to be shut down. In
shutdown all functions are disabled.
SYNC/MODE (Pin
2): Combination Mode Selection and
Oscillator Synchronization Pin. This pin controls the op-
eration of the device. When tied to SV
IN
or SGND, Burst
Mode operation or pulse skipping mode is selected,
respectively. If this pin is held at half of SV
IN
, the forced
continuous mode is selected. The oscillation frequency
can be syncronized to an external oscillator applied to
this pin. When synchronized to an external clock pulse
skip mode is selected.
S
G
ND (Pin 3): The Signal Ground Pin. All small signal
components and compensation components should be con-
nected to this ground (see Board Layout Considerations).
SW
(Pin 4): The Switch Node Connection to the Inductor.
This pin swings from PV
IN
to PGND.
PGND (Pin 5): Main Power Ground Pin. Connect to the
(–) terminal of C
OUT
, and (–) terminal of C
IN
.
PV
IN
(Pin 6): Main Supply Pin. Must be closely decoupled
to PGND.
SV
IN
(Pin 7): The Signal Power Pin. All active circuitry
is powered from this pin. Must be closely decoupled to
SGND. SV
IN
must be greater than or equal to PV
IN
.
PGOOD (Pin 8): The Power Good Pin. This common drain
logic output is pulled to SGND when the output voltage is
not within ±7.5% of regulation.
V
FB
(Pin 9): Receives the feedback voltage from the ex-
ternal resistive divider across the output. Nominal voltage
for this pin is 0.8V.
I
TH
(Pin 10): Error Amplifier Compensation Point. The
current comparator threshold increases with this control
voltage. Nominal voltage range for this pin is 0V to 1.5V.
G
N
D (Exposed Pad Pin 11): Thermal Ground. Con-
nect to SGND and solder to the PCB for rated thermal
performance.
block DiagraM
–
+
8
9
–
+
+
–
–
+
0.74V
0.8V
ERROR
AMPLIFIER
V
B
BURST
COMPARATOR
HYSTERESIS = 80mV
BCLAMP
NMOS
COMPARATOR
PMOS CURRENT
COMPARATOR
REVERSE
COMPARATOR
0.86V
5
SW
4
PGOOD
10
I
TH
V
FB
1
SHDN/R
T
2
SYNC/MODE
3568 BD
6
PV
IN
3
SGND
7
SV
IN
SLOPE
COMPENSATION
VOLTAGE
REFERENCE
OSCILLATOR
LOGIC
I
TH
LIMIT
–
+
–
+
+
–
PGND
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC3568EDD#TRPBF

Mfr. #:
Buy LTC3568EDD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.8A, 4MHz, Sync Buck DC/DC Conv
Lifecycle:
New from this manufacturer.
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