lt3844 Linear Technology Corporation, lt3844 Datasheet - Page 24

• Manufacturer Part Number: lt3844
• Description: High Voltage, Current Mode Switching Regulator Controller With Programmable Operating Frequency
• Manufacturer: Linear Technology Corporation

RELATED PARTS
LT3844
24
TYPICAL APPLICATIO S
PART NUMBER
LT1339
LTC1624
LTC1702A
LTC1735
LTC1778
LT3010
LT3430/LT3431
LTC3703/LTC3703-5
LT3724
LT3800
V
IN
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
12V
R2
383k
+
R1
10k
C
33μF ×2
25V
DESCRIPTION
High Power Synchronous DC/DC Controller
Switching Controller
Dual 2-Phase Synchronous DC/DC Controller
Synchronous Step-Down DC/DC Controller
No R
50mA, 3V to 80V Linear Regulator
Monolithic 3A, 200kHz/500kHz Step-Down Regulator
100V Synchronous Switching Regulator Controllers
High Voltage Current Mode Switching Regulator
Controllers
High Voltage Synchronous Regulator Controller
IN
●
SENSE
FAX: [phone]
C2
120pF
Synchronous DC/DC Controller
12V to 48V 50W Step Up Converter with 400kHz Switching Frequency
4700pF
R6
40k
C3
4700pF
C1
0.1μF
25V
C4
U
R4
4.7M
●
www.linear.com
R5
33.2k
1
2
3
4
5
6
7
8
V
SHDN
C
BURST_EN
V
V
SYNC
f
SET
IN
SS
FB
C
LT3844
SENSE
SENSE
BOOST
PGND
SGND
V
SW
TG
CC
+
–
16
15
14
13
12
11
10
9
COMMENTS
V
Buck, Boost, SEPIC, 3.5V ≤ V
550kHz Operation, No R
3.5V = <V
4V = <V
1.275V = <V
8-Lead MSOP Package
5.5V = <V
No R
V
On Board Bias Regulator, Burst Mode Operation, 200kHz Operation
V
Burst Mode Operation, 16-Lead TSSOP FE Package
IN
IN
IN
D1
BAV99
up to 60V, Drivers 10000pF Gate Capacitance, I
up to 60V, I
up to 60V, I
C5
2.2μF
25V
SENSE
IN
IN
= <36V, Fast Transient Response, Current Mode, I
IN
, Voltage Mode Control, GN16 Package
R
0.01Ω
= <36V, 0.8V = <V
= <60V, 0.1Ω Saturation Switch, 16-Lead SSOP Package
OUT
SENSE
OUT
OUT
= <60V, No Protection Diode Required,
≤ 5A, 16-Lead TSSOP FE Package,
≤ 20A, Current Mode, On Board Bias Regulator,
SENSE
M1
L1
6.8μH
3844 TA05
IN
D2
, 3V = <V
OUT
≤ 36V; 8-Lead SO Package
+
© LINEAR TECHNOLOGY CORPORATION 2006
M1 = VISHAY, Si7370DP
L1 = VISHAY, IHLP5050FD-01
D2 = DIODES INC., PDS560
C
C
C
R
= <6V, Current Mode, I
IN
OUT1
OUT2
SENSE
= SANYO, 25SVP33M
C
330μF
IN
= SANYO, 63CE220FST
= TDK, C4532X7R2A225K
OUT1
= IRC, LRF2512-01-R010-F
= <7V, I
48V AT 50W
V
OUT
OUT
LT 0707 • PRINTED IN USA
OUT
C
220μF
OUT2
= <20A
= <20A
OUT
OUT
= <20A
= <20A
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