LM1937
TYPICAL APPLICATIONS
V
IN
3V TO 5V
L
22 H
C
IN
1μF
85
D
C
OUT
0.22μF
80
EFFICIENCY (%)
V
DC
DIMMING
V
IN
LM1937
SHDN
GND
SW
90k
5k
FB
R1
4Ω
V
IN
= 3V
75
V
IN
= 3.6V
70
C
IN
: TAIYO YUDEN JMK107BJ105
C
OUT
: TAIYO YUDEN GMK212BJ224
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
1937 TA03a
65
0
2
4
6
8
LOAD CURRENT (mA)
10
12
1937 TA03b
Li-Ion to Five White LEDs
Five LED Efficiency
V
IN
5V
L
22 H
C
IN
1μF
85
D
C
OUT
0.22μF
80
EFFICIENCY (%)
V
DC
DIMMING
V
IN
LM1937
SHDN
GND
SW
90k
5k
FB
R1
4Ω
1937 TA04a
75
70
C
IN
: TAIYO YUDEN JMK107BJ105
C
OUT
: TAIYO YUDEN GMK212BJ224
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
65
0
5
10
LOAD CURRENT (mA)
15
1937 TA04b
5V to Seven White LEDs
Seven LED Efficiency
PACKAGE
0.62
MAX
0.95
REF
SOT-23-5L
2.90 BSC
(NOTE 4)
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
1.00 MAX
DATUM ‘A’
0.01 – 0.10
0.30 – 0.50 REF
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
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
0.09 – 0.20
(NOTE 3)
1.90 BSC
S5 TSOT-23 0302
6
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