Datasheet

12V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controller
MAX1771
Maxim Integrated
15
MAX1771
SHDN
R1
0.15Ω
R7
200Ω
REF
AGND
GND
4
5
Q1
MTD6N10
6
-48V
EXT
CS
1
L1
D03340
220µH–680µH
8
3
1
2
D1
MBRS1100T3
D2
CMPZ5240/
MMBZ5240BL
D3
CMPSH-3
C8
1µF
+5V
300mA
7
C5
0.1µF
C6
10µF
100V
FB
3
V+
Q3
MMBT8599LT1
2
C7
220pF
R2
47kΩ
1%
R3
16kΩ
1%
C4
2.2µF
20V
R5
1kΩ
R6
200kΩ
R4
100kΩ
C1
220µF
10V
C3
0.33µF
Q2
MMBT8099LT1
R9
5.1kΩ
C2
220µF
10V
GNDREF
MAX1771
V+
EXTL
CS
4
SHDN
0.1µF
3.3V OR 5V
LOGIC
SUPPLY
BATTERY
INPUT
2V TO 12V
8
6, 7
5
R
SENSE
0.2Ω
1N5817
1
2
L1
22µH
OUTPUT
ADJ = 12V TO 24V
(AS SHOWN)
N
47µF
0.1µF
FB
3
R3
10kΩ
10kΩ
R2
150kΩ
MMFT3055ELT1
OFF
ON
Figure 7. -48V Input to 5V Output at 300mA, Without a Transformer
Figure 8. 2V Input to 24V Output LCD Bias