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| 型号： | LT1767EMS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 20 V |
| 输入电压： | 3 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.25MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
APPLICATIO N S I N FOR M ATIO N
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
0.1 μ F
REMOVABLE
INPUT
UPS120*
83k
V IN
BOOST
LT1767-3.3
V SW
5 μ H
3.3V, 1A
ALTERNATE
SUPPLY
SHDN
FB
SYNC GND
V C
UPS120
28.5k
2.2 μ F
1.5nF
4.7k
2.2 μ F
1767 F09
* ONLY REQUIRED IF INPUT CAN SINK >10mA
Figure 9. Dual Source Supply with 6 μ A Reverse Leakage
D2
CMDSH-3
D2
CMDSH-3
V IN
6V TO 15V
V IN
BOOST
C2
0.1 μ F
V SW
L1A*
9 μ H
OUTPUT
5V
V IN
12V
+
C3
2.2 μ F
V IN
SHDN
BOOST
LT1767-5
V SW
FB
C2
0.1 μ F
D1
L1
5 μ H
C1
100 μ F
+
OUTPUT
5V
1A
LT1767-5
SHDN
SYNC GND
C3
2.2 μ F
16V
CERAMIC
V C
FB
C C
330pF
D1
+
C1
100 μ F
10V TANT
D1: UPS120
Q1: 2N3904
SYNC
GND
V C
C C
330pF Q1
R3
2k
R4
47k
C SS
15nF
1767 F10
GND
? IF LOAD CAN GO TO ZERO, CERAMIC
AN OPTIONAL PRELOAD OF 1k TO 5k
MAY BE USED TO IMPROVE LOAD REGULATION
D1, D3: UPS120
C4
* L1 IS A SINGLE CORE WITH TWO WINDINGS 2.2 μ F
BH ELECTRONICS #511-1013 16V
C5
L1B* 100 μ F
10V TANT
D3
+
OUTPUT
–5V ?
1767 F11
Figure 10. Buck Converter with Adjustable Soft-Start
Figure 11. Dual Output SEPIC Converter
PACKAGE DESCRIPTIO N
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.043
(1.10)
0.034
(0.86)
0.118 ± 0.004 *
(3.00 ± 0.102)
8
7 6
5
MAX
REF
0.007
(0.18)
0.021 ± 0.006
(0.53 ± 0.015)
0 ° – 6 ° TYP
SEATING
PLANE
0.009 – 0.015
(0.22 – 0.38)
0.0256
0.005 ± 0.002
(0.13 ± 0.05)
0.193 ± 0.006
(4.90 ± 0.15)
0.118 ± 0.004**
(3.00 ± 0.102)
(0.65)
BSC
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
1
2 3
4
MSOP (MS8) 1100
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
sn1767 1767fas
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.
15
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