LT1767EMS8E-2.5 Просмотр технического описания (PDF) - Linear Technology
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LT1767EMS8E-2.5 Datasheet PDF : 16 Pages
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LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
APPLICATIONS INFORMATION
during switch on time, causing current to flow, and energy
to build in L1B and C4. At switch off, the energy stored in
both L1B and C4 supply the –5V rail. This reduces the
current in L1A and changes L1B current waveform from
square to triangular. For details on this circuit, including
maximum output currents, see Design Note 100.
CMDSH-3
REMOVABLE
INPUT
UPS120*
83k
28.5k
0.1µF
BOOST
VIN
VSW
LT1767-3.3
SHDN
FB
SYNC GND VC
2.2µF
1.5nF
4.7k
5µH
UPS120
3.3V, 1A ALTERNATE
SUPPLY
2.2µF
* ONLY REQUIRED IF INPUT CAN SINK >10mA
1767 F09
Figure 9. Dual Source Supply with 6µA Reverse Leakage
D2
CMDSH-3
VIN
12V +
C2
0.1µF
BOOST
VIN
C3
2.2µF
LT1767-5
SHDN
VSW
D1
FB
SYNC GND VC
CC
330pF
Q1
D1: UPS120
Q1: 2N3904
D2
CMDSH-3
L1
5µH
C1 +
100µF
R3
2k
CSS
15nF
R4
47k
OUTPUT
5V
1A
1767 F10
C2
0.1µF
VIN
6V TO 15V
BOOST
VIN
VSW
LT1767-5
SHDN
FB
SYNC GND VC
C3
2.2µF
16V
CERAMIC
CC
330pF
GND
C4
* L1 IS A SINGLE CORE WITH TWO WINDINGS 2.2µF
BH ELECTRONICS #511-1013
† IF LOAD CAN GO TO ZERO,
16V
CERAMIC
AN OPTIONAL PRELOAD OF 1k TO 5k
MAY BE USED TO IMPROVE LOAD REGULATION
D1, D3: UPS120
L1A*
9µH
OUTPUT
5V
+ C1
100µF
10V TANT
D1
C5 +
L1B* 100µF
10V TANT
D3
OUTPUT
–5V†
1767 F11
Figure 10. Buck Converter with Adjustable Soft-Start
Figure 11. Dual Output SEPIC Converter
PACKAGE DESCRIPTION
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.007
(0.18)
0° – 6° TYP
0.021 ± 0.006
(0.53 ± 0.015)
SEATING
PLANE
0.043
(1.10)
MAX
0.009 – 0.015
(0.22 – 0.38)
0.0256
(0.65)
BSC
0.034
(0.86)
REF
0.005 ± 0.002
(0.13 ± 0.05)
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
0.118 ± 0.004*
(3.00 ± 0.102)
0.193 ± 0.006
(4.90 ± 0.15)
8 76 5
1 234
0.118 ± 0.004**
(3.00 ± 0.102)
MSOP (MS8) 1100
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
sn1767 1767fas
15
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