LT1947EMS Linear Technology, LT1947EMS Datasheet - Page 8

• Manufacturer Part Number: LT1947EMS
• Description: IC SW REG TFT-LCD TRPL ADJ10MSOP
• Manufacturer: Linear Technology

Specifications of LT1947EMS

• Applications: Converter, TFT, LCD
• Voltage - Input: 2.7 ~ 8 V
• Number Of Outputs: 3
• Voltage - Output: Adjustable up to 30V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

OPERATIO
LT1947
8
U
V
SS
CERAMIC
33nF
20V/DIV
10V/DIV
10V/DIV
33.2k
C
R
5V/DIV
SS
SS
C1: TAIYO YUDEN LMK316BJ225MD
C2: TAIYO YUDEN LMK325BJ335MD ×2
C3: AVX 0.22µF 25V X7R
C4, C6: TAIYO YUDEN LMK107BJ684MA
2.2µF
AV
V
V
V
V
IN
Figure 3. R
OFF
ON
V
SS
DD
C1
OFF
SS
Figure 4. Start-Up Waveforms
with Soft-Start Circuit Added
L2
4.7µH
D2
C3
220nF
and C
SS
R3
182k
R4
10k
at SHDN Pin Provide Soft-Start
5ms/DIV
SW2
V
FB2
O2
SHDN C
10nF
V
IN
C5
LT1947
D1: MBRM120LT3
D2: CMDSH-3
D3, D4: BAT54S DUAL DIODE
L1: SUMIDA CLQ4D103R3
L2: TAIYO YUDEN LB2012B4R7M
3.3µH
L1
T
D3
SW1
GND
V
FB1
ON
D1
C6
0.68µF
D4
1947 F04.tif
R1
53.6k
R2
10k
1947 F03
C4
0.68µF
CERAMIC
C2
3.3µF
CERAMIC
×2
V
–8V
10mA
AV
8V
200mA
V
24V
10mA
OFF
ON
DD
1947fa