MAX748AC Просмотр технического описания (PDF) - Maxim Integrated
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MAX748AC Datasheet PDF : 12 Pages
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3.3V, Step-Down,
Current-Mode PWM DC-DC Converters
SHDN
OUT
C5
330pF CC
REF
C6
1000pF
SS
C1
0.047µF
BIAS
GEN
ERROR AMP
1.23V
BANDGAP
1M
±35%
GND
SLOPE COMPENSATION
MAX748A 3.3V to 16.0V
MAX763A 3.3V to 11.0V VIN
V+
OVERCURRENT COMPARATOR
RAMP
Σ
GEN
F/F
R
PWM
COMPARATOR
Q
S
200kHz
OSC
SS CLAMP
CURRENT
SENSE AMP
RSENSE
MAX748A
MAX763A
UNDERVOLTAGE
LOCKOUT
C2
C3
1.0µF 150µF
L1
LX 22µH
D1
1N5817
VOUT
3.3V
C4
150µF
VUVLO
Figure 1. Detailed Block Diagram with External Components
FROM SHDN
SS
C1
SS CLAMP
1M
±35%
1.23V
MAX748A
MAX763A
Table 1. Typical Soft-Start Times
(Circuit of Figure 3, C4 = 150µF)
Circuit Cond.
Soft-Start Time (ms) vs. C1 (µF)
V+ (V) IOUT (mA) C1 = 0.01 C1 = 0.047 C1 = 0.1 C1 = 0.47
8
0
1
4
7
12
12*
0
1
2
3
6
8
200
10
33
50
200
12*
200
7
17
20
80
8
300
13
44
65
325
12*
300
8
25
35
140
* MAX748A only
Figure 2. Soft-Start Circuitry Block Diagram
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