LT1935 Linear Technology, LT1935 Datasheet - Page 7

• Manufacturer Part Number: LT1935
• Description: DC/DC Converter
• Manufacturer: Linear Technology

PACKAGE DESCRIPTIO
TYPICAL APPLICATIO S
2.3V TO 4.8V
V
IN
0.20 BSC
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
C1, C2: X5R OR X7R 6.3V
D1: ON SEMI MBRM120
L1: SUMIDA CR43-1R8
ON OFF
C1
4.7µF
3.85 MAX
DATUM ‘A’
5V Boost Converter
2.62 REF
SHDN
V
IN
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.
RECOMMENDED SOLDER PAD LAYOUT
LT1935
1.8µH
GND
L1
0.62
MAX
0.30 – 0.50 REF
PER IPC CALCULATOR
U
SW
FB
U
3.3V
D1
V
IN
0.95
REF
R1
29.4k
R2
10k
D1: ON SEMI MBRM120
L1: SUMIDA CDRH5D28-4R2
ON OFF
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
C1
4.7µF
(Reference LTC DWG # 05-08-1635)
3.3V to 12V Boost Converter
1.22 REF
1.4 MIN
0.09 – 0.20
C3
150pF
5-Lead Plastic TSOT-23
(NOTE 3)
SHDN
V
IN
1935 TA01
LT1935
4.2µH
C2
20µF
S5 Package
GND
2.80 BSC
L1
V
5V
1A, V
0.6A, V
OUT
SW
IN
FB
IN
1.00 MAX
= 3.3V
= 2.5V
1.50 – 1.75
(NOTE 4)
0.80 – 0.90
PIN ONE
D1
47pF
0.95 BSC
R1
84.5k
R2
10k
1935 TA02
C2
22µF
V
12V
320mA
2.90 BSC
(NOTE 4)
1.90 BSC
OUT
90
85
80
75
70
65
60
55
50
0
Efficiency, V
200
S5 TSOT-23 0302
LOAD CURRENT (mA)
400
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.01 – 0.10
600
V
OUT
IN
800
= 2.5V
= 5V
V
IN
1000
= 3.3V
LT1935
1200
7
1935f