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LTC3413IFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3413
4
3413fc
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current vs Input Voltage
Load Step Transient
20μs/DIVV
IN
= 2.5V
V
OUT
= 1.25V
LOAD STEP = 0A to 3A
OUTPUT
VOLTAGE
100mV/DIV
INDUCTOR
CURRENT
1A/DIV
3413 G11
INPUT VOLTAGE (V)
2.0
200
250
350
3.5 4.5
3413 G10
150
100
2.5 3.0
4.0 5.0 5.5
50
0
300
QUIESCENT CURRENT (μA)
T
A
= 25°C
Frequency vs R
OSC
Frequency vs Input Voltage Frequency vs Temperature
R
OSC
(kΩ)
54
0
FREQUENCY (kHz)
500
1500
2000
2500
654 754 854 954
4500
3413 G07
1000
154 254 354 454 554
3000
3500
4000
V
IN
= 3.3V
T
A
= 25°C
INPUT VOLTAGE (V)
2.5
990
FREQUENCY (kHz)
1000
1010
1020
1030
1050
3
3.5 4 4.5
3213 G08
5 5.5
1040
T
A
= 25°C
TEMPERATURE (°C)
–40
990
FREQUENCY (kHz)
992
996
998
1000
1010
1004
0
40
60
3413 G09
994
1006
1008
1002
–20 20
80
100
120
V
IN
= 3.3V
Switch On-Resistance
vs Temperature
Switch On-Resistance
vs Input Voltage Switch Leakage vs Input Voltage
TEMPERATURE (°C)
–40
0
ON-RESISTANCE (mΩ)
20
40
60
80
040
80
120
3413 G04
100
120
–20 20
60
100
PFET
ON-RESISTANCE
NFET
ON-RESISTANCE
V
IN
= 3.3V
INPUT VOLTAGE (V)
2.5
0
ON-RESISTANCE (mΩ)
20
40
60
80
100
120
3 3.5 4 4.5
3413 G05
5
PFET ON-RESISTANCE
NFET ON-RESISTANCE
T
A
= 25°C
INPUT VOLTAGE (V)
2.5
0
LEAKAGE CURRENT (nA)
0.5
1.0
1.5
2.0
2.5
3
3.5 4 4.5
3413 G06
5 5.5
PFET
NFET
T
A
= 25°C
LTC3413
5
3413fc
Start-Up
1ms/DIVV
IN
= 2.5V
V
OUT
= 1.25V
LOAD = 0.4Ω
OUTPUT
VOLTAGE
500mV/DIV
INDUCTOR
CURRENT
1A/DIV
3413 G13
Load Step Transient
20μs/DIVV
IN
= 2.5V
V
OUT
= 1.25V
LOAD STEP = 0A TO –3A
OUTPUT
VOLTAGE
100mV/DIV
INDUCTOR
CURRENT
1A/DIV
3413 G12
TYPICAL PERFORMANCE CHARACTERISTICS
SV
IN
(Pin 1): Signal Input Supply. Decouple this pin to
SGND with a capacitor. SV
IN
must be greater or equal to
PV
IN
, however, the difference between SV
IN
and PV
IN
must
be less than 0.5V.
PGOOD (Pin 2): Power Good Output. Open-drain logic
output that is pulled to ground when the output voltage
is not within ±10% of regulation point.
I
TH
(Pin 3): Error Amplifi er 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 0.6V corresponding to the zero-sense voltage
(zero current).
V
FB
(Pin 4): Feedback Pin. Receives the feedback voltage
from the output.
R
T
(Pin 5): Oscillator Resistor Input. Connecting a resistor
to ground from this pin sets the switching frequency.
V
REF
(Pin 6): Reference Voltage Input. The positive input
of the internal error amplifi er senses one-half of the volt-
age at this pin through a resistor divider.
RUN/SS (Pin 7): Run Control and Soft-Start Input. Forcing
this pin below 0.5V shuts down the LTC3413. In shutdown
all functions are disabled drawing < 1μA of supply current.
A capacitor to ground from this pin sets the ramp time to
full output current.
SGND (Pin 8): Signal Ground. All small-signal components
and compensation components should connect to this
ground, which in turn connects to PGND at one point.
PV
IN
(Pins 9, 16): Power Input Supply. Decouple this pin
to PGND with a capacitor.
SW (Pins 10, 11, 14, 15): Switch Node Connection to
Inductor. This pin connects to the drains of the internal
main and synchronous power MOSFET switches.
PGND (Pins 12, 13): Power Ground. Connect this pin
closely to the (–) terminal of C
IN
and C
OUT
.
Exposed Pad (Pin 17): Should be connected to PCB
ground.
PIN FUNCTIONS
LTC3413
6
3413fc
Main Control Loop
The LTC3413 is a monolithic, constant frequency, current
mode step-down DC/DC converter that is capable of sourc-
ing and sinking current at the output. During normal opera-
tion, the internal top power switch (P-channel MOSFET) is
turned on at the beginning of each clock cycle. Current in
the inductor increases until the current comparator 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 amplifi er adjusts the voltage on the I
TH
pin by
comparing the feedback signal on the V
FB
pin with a ref-
erence voltage that is equal to one-half of the voltage on
the V
REF
pin. When the load current increases, it causes
a reduction in the feedback voltage relative to the refer-
ence. The error amplifi er 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 –7A.
The operating frequency is set by an external resistor
connected between the R
T
pin and ground. The switching
frequency can range from 300kHz to 2MHz.
Overvoltage and undervoltage comparators will pull the
PGOOD output low if the output voltage comes out of
regulation by ±10%. In an overvoltage condition, the top
power MOSFET is turned off and the bottom power MOSFET
is switched on until either the overvoltage condition clears
or the bottom MOSFET’s current limit is reached.
Dropout Operation
When the input supply voltage decreases toward the output
voltage, the duty cycle increases toward the maximum
on-time. Further reduction of the supply voltage forces the
–
+
–
+
–
+
–
+
–
+
16
10
9
PV
IN
3
I
TH
6
V
REF
1
8
SV
IN
SGND
4
V
FB
PGOOD
SV
IN
PV
IN
SLOPE
COMPENSATION
RECOVERY
SLOPE
COMPENSATION
PMOS CURRENT
COMPARATOR
NMOS CURRENT
COMPARATOR
OSCILLATOR
ERROR
AMPLIFIER
LOGIC
RUN
RUN/SSR
T
11
14
15
SW
SW
SW
SW
13
75
PGND
3413 BD
12
PGND
2
1.1V
REF
2
0.9V
REF
2
FUNCTIONAL DIAGRAM
OPERATION
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3413IFE#TRPBF

Mfr. #:
Buy LTC3413IFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 3A, 4MHz, Synchronous Regulator for DDR Memory Termination
Lifecycle:
New from this manufacturer.
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