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LTC3872IDDB-1#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC3872-1
4
38721f
For more information www.linear.com/LTC3872-1
Shutdown I
Q
vs V
IN
Shutdown I
Q
vs Temperature
Typical perForMance characTerisTics
T
A
= 25°C, unless otherwise noted.
FB Voltage vs Temperature
FB Voltage Line Regulation
I
TH
Voltage vs RUN/SS Voltage
TEMPERATURE (°C)
–60
FB VOLTAGE (V)
1.22
1.23
1.24
6040
38721 G01
1.21
1.20
–20–40 200 10080
1.19
1.18
1.25
V
IN
(V)
0
1.1990
FB VOLTAGE (V)
1.1995
1.2005
1.2010
1.2015
1.2025
1
5
7
38721 G02
1.2000
1.2020
4
9
10
2
3
6 8
RUN VOLTAGE (V)
0
I
TH
VOLTAGE (V)
1.5
2.0
2.5
4.0
38721 G03
1.0
0.5
0
0.5 1.0 1.5
2.0 2.5
3.0 3.5 4.5
5.0
V
IN
= 2.5V
V
IN
= 3.3V
V
IN
= 5V
TEMPERATURE (°C)
–50
0
SHUTDOWN IQ (µA)
5
10
15
20
–25 0 25 50
38721 G05
75 100 125 150
V
IN
(V)
2
SHUTDOWN I
Q
(µA)
8
10
12
8
38721 G04
6
4
4
3
5
7
96 10
2
0
14
LTC3872-1
5
38721f
For more information www.linear.com/LTC3872-1
Gate Drive Rise and Fall Time
vs C
LOAD
RUN/SS Threshold vs V
IN
RUN/SS Threshold vs
Temperature
Frequency vs Temperature
Maximum Sense Threshold
vs Temperature
Typical perForMance characTerisTics
T
A
= 25°C, unless otherwise noted.
C
LOAD
(pF)
0
TIME (ns)
60
80
100
8000
38721 G06
40
20
50
70
90
30
10
0
2000
4000
6000
10000
RISE TIME
FALL TIME
V
IN
(V)
0
RUN THRESHOLD (V)
0.90
0.92
0.94
6
10
38721 G07
0.88
0.86
0.84
2 4 8
0.96
0.98
1.00
12
RISING
FALLING
TEMPERATURE (°C)
–50
RUN THRESHOLD (V)
0.8
0.9
1.0
25 75 150
0.7
0.6
0.5
–25 0
50
100 125
RISING
FALLING
TEMPERATURE (°C)
–50
500
FREQUENCY (kHz)
525
550
575
600
–5 0 25 50
38721 G09
75 100 125 150
TEMPERATURE (°C)
0
MAXIMUM SENSE THRESHOLD (mV)
100
200
300
50
150
250
–10 30 70 110
38721 G10
150–30–50 10 50 90 130
IPRG = V
IN
IPRG = FLOAT
IPRG = GND
LTC3872-1
6
38721f
For more information www.linear.com/LTC3872-1
IPRG (Pin 1/Pin 4): Current Sense Limit Select Pin.
I
TH
(Pin 2/Pin 3): Error Amplifier Compensation Point.
Nominal voltage range for this pin is 0.7V to 1.9V.
V
FB
(Pin 3/Pin 2): Receives the feedback voltage from an
external resistor divider across the output.
GND (Pin 4/Pin 1, Exposed Pad Pin 9): Ground. The ex
-
posed pad must be soldered to PCB ground for electrical
contact and rated thermal performance.
NGATE (Pin 5/Pin 8): Gate Drive for the External N-Channel
MOSFET. This pin swings from 0V to V
IN
.
V
IN
(Pin 6/Pin 7): Supply Pin. This pin must be closely
decoupled to GND.
RUN/SS (Pin 7/Pin 6): Shutdown and external soft-start
pin. In shutdown, all functions are disabled and the NGATE
pin is held low.
SW (Pin 8/Pin 5): Switch node connection to inductor and
current sense input pin through external slope compensa
-
tion resistor. Normally, the external N-channel MOSFET’s
drain is connected to this pin.
RUN/SS
V
IN
SWGND
I
TH
V
FB
NGATE
38721 FD
IPRG
SLOPE
COMPENSATION
550kHz
OSCILLATOR
CURRENT
COMPARATOR
SR
Q
V
IN
VOLTAGE
REFERENCE
UNDERVOLTAGE
LOCKOUT
–
+
I
TH
BUFFER
SWITCHING
LOGIC CIRCUIT
CURRENT LIMIT
CLAMP
INTERNAL
SOFT-START
RAMP
– +
I
LIM
RS
LATCH
1.2V
1.2V
UV
SHUTDOWN
COMPARATOR
SHDN
ERROR
AMPLIFIER
0.7µA
–
+
pin FuncTions
(TS8/DD8)
FuncTional DiagraM
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC3872IDDB-1#TRMPBF

Mfr. #:
Buy LTC3872IDDB-1#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators No RSENSE C Mode Boost DC/DC Cntr
Lifecycle:
New from this manufacturer.
Delivery:
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