MAX763ACSA Datasheet Download

Part No.:
MAX763ACSA
Download:
Download Datasheet
Description:
[3.3V, Step-Down, Current-Mode PWM DC-DC Converters]
File Size:
136 K
Page:
12 Pages
Logo:
Manufacturer:
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
PCB Prototype
 MAX763ACSA Datasheet Page:3MAX763ACSA Datasheet Page:4MAX763ACSA Datasheet Page:5MAX763ACSA Datasheet Page:6MAX763ACSA Datasheet Page:8MAX763ACSA Datasheet Page:9MAX763ACSA Datasheet Page:10MAX763ACSA Datasheet Page:11 
3.3V, Step-Down,
Current-Mode PWM DC-DC Converters
MAX748A/MAX763A
MAX748A 3.3V to 16.0V
MAX763A 3.3V to 11.0V VIN
SHDN
OVERCURRENT COMPARATOR
SLOPE COMPENSATION
BIAS
GEN
RAMP
GEN
RSENSE
ERROR AMP
CC
1.23V
BANDGAP
REF
C6
1000pF
1M
±35%
SS
C1
0.047µF
VUVLO
GND
SS CLAMP
UNDERVOLTAGE
LOCKOUT
R
S
PWM
COMPARATOR
200kHz
OSC
F/F
Q
LX
CURRENT
SENSE AMP
L1
22µH
D1
1N5817
VOUT
3.3V
C4
150µF
V+
C2
1.0µF
C3
150µF
Σ
OUT
C5
330pF
MAX748A
MAX763A
Figure 1. Detailed Block Diagram with External Components
Table 1. Typical Soft-Start Times
FROM SHDN
(Circuit of Figure 3, C4 = 150µF)
Circuit Cond.
Soft-Start Time (ms) vs. C1 (µF)
V+ (V) I
OUT
(mA) C1 = 0.01 C1 = 0.047 C1 = 0.1 C1 = 0.47
8
12*
8
12*
1M
±35%
SS CLAMP
0
0
200
200
300
300
1
1
10
7
13
8
4
2
33
17
44
25
7
3
50
20
65
35
12
6
200
80
325
140
SS
8
12*
C1
1.23V
* MAX748A only
MAX748A
MAX763A
Figure 2. Soft-Start Circuitry Block Diagram
_______________________________________________________________________________________
7