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LT3724 Datasheet(PDF) 7 Page - Linear Technology

Part # LT3724
Description  High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3724 Datasheet(HTML) 7 Page - Linear Technology

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LT3844
7
3844fb
FUNCTIONAL DIAGRAM
PIN FUNCTIONS
BOOST (Pin 16): The BOOST pin is the supply for the
bootstrapped gate drive and is externally connected to a
low ESR ceramic boost capacitor referenced to SW pin.
The recommended value of the BOOST capacitor, CBOOST,
is 50 times greater than the total input capacitance of the
topside MOSFET. In most applications 0.1μF is adequate.
The maximum voltage that this pin sees is VIN + VCC,
ground referred.
Exposed Pad (Pin 17): SGND. The exposed leadframe is
internally connected to the SGND pin. Solder the exposed
pad to the PCB ground for electrical contact and optimal
thermal performance.
+
+
VIN
UVLO
(<4V)
BST
UVLO
8V
REGULATOR
FEEDBACK
REFERENCE
+
1.231V
3.8V
REGULATOR
INTERNAL
SUPPLY RAIL
1
9
6
VIN
VCC
UVLO
(<6V)
SHDN
DRIVE
CONTROL
NOL
SWITCH
LOGIC
DRIVE
CONTROL
BURST_EN
VC
CSS
SENSE
VFB
0.5V
2μA
50μA
Burst Mode
OPERATION
R
S
Q
OSCILLATOR
SLOPE COMP
GENERATOR
BOOST
TG
SW
VCC
PGND
SYNC
fSET
RSET
SENSE+
SGND
BOOSTED SWITCH
DRIVER
CURRENT
SENSE
COMPARATOR
12
7
8
13
14
10
11
5
3
100mV
4
2
16
15
VREF + 200mV
SOFT-START
BURST DISABLE
DRIVER
FAULT CONDITION:
VIN UVLO
VCC UVLO
VSHDN UVLO
CSS CLAMPED TO
VFB + VBE
VREF
~1V
gm
ERROR
AMP
+
M1
D2
D3
D1
L1
(OPTIONAL)
RSENSE
3844 FD
CC2
CC1
R1
RA
RB
VIN
CIN
R2
CBOOST
VOUT
COUT
CVCC
RC


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