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LTC3414IFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3414
4
3414fb
LOAD CURRENT (A)
EFFICIENCY (%)
100
95
90
85
80
75
70
65
60
55
50
0.001 0.1 1 10
3414 G10
0.01
LOAD CURRENT (A)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0.001 0.1 1 100.01
3414 G11
INPUT VOLTAGE (V)
2.5
EFFICIENCY (%)
3.0
3.5
4.0 4.5
3414 G13
5.0
98
96
94
92
90
88
86
84
82
80
78
5.5
LOAD CURRENT (A)
ΔV
OUT
/V
OUT
(%)
3414 G15
0
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
0
1.0
2.0
2.5
0.5 1.5
3.0
3.5
4.0
FREQUENCY (kHz)
EFFICIENCY (%)
3414 G14
100
95
90
85
80
75
70
300
1300
2300
2800
800 1800
3300
3800
3414 G16 3414 G17
V
IN
= 3.3V
V
IN
= 5V
V
IN
= 3.3V
V
IN
= 5V
I
OUT
= 1A
I
OUT
= 4A
L = 0.47μH
L = 0.2μH
L = 1μH
V
IN
= 3.3V, V
OUT
= 2.5V
LOAD = 250mA
OUTPUT
VOLTAGE
20mV/DIV
INDUCTOR
CURRENT
500mA/DIV
V
IN
= 3.3V, V
OUT
= 2.5V
LOAD STEP = 0A TO 4A
OUTPUT
VOLTAGE
100mV/DIV
INDUCTOR
CURRENT
2A/DIV
LOAD CURRENT (A)
EFFICIENCY (%)
100
95
90
85
80
75
70
65
60
55
50
0.001 0.1 1 10
3414 G12
0.01
Burst Mode OPERATION
FORCED
CONTINUOUS
10μs/DIV 20μs/DIV
V
IN
= 3.3V
V
OUT
= 2.5V
V
OUT
= 2.5V
T
A
= 25°C
V
OUT
= 2.5V
T
A
= 25°C
V
IN
= 3.3V
V
OUT
= 2.5V
T
A
= 25°C
V
IN
= 3.3V
V
OUT
= 2.5V
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Efficiency vs Load Current, Burst
Mode Operation
Efficiency vs Input Voltage Efficiency vs Frequency
Efficiency vs Load Current,
Forced Continuous
Load Regulation
Burst Mode Operation
Load Step Transient Forced
Continuous
Efficiency vs Load Current
LTC3414
5
3414fb
PGND (Pins 1, 10, 11, 20): Power Ground. Connect this
pin closely to the (–) terminal of C
IN
and C
OUT
.
RT (Pin 2): Oscillator Resistor Input. Connecting a resistor
to ground from this pin sets the switching frequency.
SYNC/MODE (Pin 3): Mode Select and External Clock
Synchronization Input. To select Forced Continuous, tie to
SV
IN
. Connecting this pin to a voltage between 0V and 1V
selects Burst Mode operation with the burst clamp set to
the pin voltage.
RUN/SS (Pin 4): Run Control and Soft-Start Input. Forcing
this pin below 0.5V shuts down the LTC3414. In shutdown
all functions are disabled. Less than 1μA of supply current
is consumed. A capacitor to ground from this pin sets the
ramp time to full output current.
SGND (Pin 5):Signal Ground. All small signal components
and compensation components should connect to this
ground, which in turn connects to PGND at one point.
NC (Pin 6): Open. No internal connection.
PV
IN
(Pins 7, 14): Power Input Supply. Decouple this pin
to PGND with a capacitor.
SW (Pins 8, 9, 12, 13): Switch Node Connection to
Inductor. This pin connects to the drains of the internal
main and synchronous power MOSFET switches.
NC (Pin 15): Open. No internal connection.
SV
IN
(Pin 16): Signal Input Supply. Decouple this pin to
SGND with a capacitor.
PGOOD (Pin 17): Power Good Output. Open drain logic
output that is pulled to ground when the output voltage is
not within ±7.5% of regulation point.
I
TH
(Pin 18): Error Amplifier Compensation Point. The
current comparator threshold increases with this control
voltage. Nominal voltage range for this pin is from 0.2V to
1.4V with 0.4V corresponding to the zero-sense voltage
(zero current).
V
FB
(Pin 19): Feedback Pin. Receives the feedback voltage
from a resistive divider connected across the output.
Exposed Pad (Pin 21): Should be connected to SGND and
soldered to the PCB.
UU
U
PI FU CTIO S
Start-Up Transient
TYPICAL PERFOR A CE CHARACTERISTICS
UW
3414 G19
V
IN
= 3.3V, V
OUT
= 2.5V
LOAD = 4A
OUTPUT
VOLTAGE
INDUCTOR
CURRENT
2A/DIV
V
RUN
1ms/DIV
Load Step Transient Burst Mode
Operation
3414 G18
V
IN
= 3.3V, V
OUT
= 2.5V
LOAD STEP = 250mA TO 4A
OUTPUT
VOLTAGE
100mV/DIV
INDUCTOR
CURRENT
2A/DIV
20μs/DIV
LTC3414
6
3414fb
Main Control Loop
The LTC3414 is a monolithic, constant-frequency, cur-
rent-mode step-down DC/DC converter. During normal
operation, the internal top power switch (P-channel MOS-
FET) is turned on at the beginning of each clock cycle.
Current in the inductor increases until the current com-
parator trips and turns off the top power MOSFET. The
peak inductor current at which the current comparator
shuts off the top power switch is controlled by the voltage
on the I
TH
pin. The error amplifier adjusts the voltage on
the I
TH
pin by comparing the feedback signal from a
resistor divider on the V
FB
pin with an internal 0.8V
reference. When the load current increases, it causes a
reduction in the feedback voltage relative to the reference.
The error amplifier raises the I
TH
voltage until the average
inductor current matches the new load current. When the
top power MOSFET shuts off, the synchronous power
switch (N-channel MOSFET) turns on until either the
bottom current limit is reached or the beginning of the next
clock cycle. The bottom current limit is set at –5A for
forced continuous mode and 0A for Burst Mode operation.
The operating frequency is externally set by an external
resistor connected between the RT pin and ground. The
practical switching frequency can range from 300kHz to
4MHz.
Overvoltage and undervoltage comparators will pull the
PGOOD output low if the output voltage comes out of
regulation by ± 7.5%. In an overvoltage condition, the top
power MOSFET is turned off and the bottom power MOS-
FET is switched on until either the overvoltage condition
clears or the bottom MOSFET’s current limit is reached.
Forced Continuous Mode
Connecting the SYNC/MODE pin to SV
IN
will disable Burst
Mode operation and force continuous current operation.
At light loads, forced continuous mode operation is less
efficient than Burst Mode operation, but may be desirable
in some applications where it is necessary to keep switch-
OPERATIO
U
BLOCK DIAGRA
W
–
+
–
+
–
+
–
+
–
+
–
+
–
+
16
19
17
4
2
5 18
7
14
SLOPE
COMPENSATION
RECOVERY
SLOPE
COMPENSATION
VOLTAGE
REFERENCE
OSCILLATOR
LOGIC
3
0.74V
0.86V
RUN
13
12
9
8
SV
IN
SGND
21
EXPOSED PADI
TH
PV
IN
PV
IN
PMOS CURRENT
COMPARATOR
BCLAMP
V
FB
RUN/SS
PGOOD
RT SYNC/MODE PGND
PGND
PGND
PGND
CURRENT
REVERSAL
COMPARTOR
NMOS CURRENT
COMPARATOR
BURST
COMPARATOR
ERROR
AMPLIFIER
SW
SW
SW
SW
10
11
20
1
3414 BD
SYNC/MODE
+
V
0.8V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3414IFE#PBF

Mfr. #:
Buy LTC3414IFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 4MHz, 4A Synch Step-dwn Regulator I Grade
Lifecycle:
New from this manufacturer.
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