MAX767EAP(1994) データシートの表示（PDF） - Maxim Integrated
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MAX767EAP Datasheet PDF : 20 Pages
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5V-to-3.3V, Synchronous, Step-Down
Power-Supply Controller
______________________________________________________________Pin Description
PIN
1
2
3
4–7, 11
8
9
10, 14, 15
12
13
16
17
18
19
20
NAME
CS
SS
ON
GND
REF
SYNC
VCC
N.C.
PGND
DL
BST
LX
DH
FB
FUNCTION
Current-sense input: +100mV = nominal current-limit level referred to FB.
Soft-start input. Ramp time to full current limit is 1ms/nF of capacitance to GND.
ON/O—F—F– control input to disable the PWM. Tie directly to VCC for automatic start-up.
Low-current analog ground. Feedback reference point for the output.
3.3V internal reference output. Bypass to GND with 0.22µF minimum capacitor.
Oscillator control/synchronization input. Connect to VCC or GND for 200kHz; connect to REF for
300kHz. For external clock synchronization in the 240kHz to 350kHz range, a high-to-low transition
causes a new cycle to start.
Supply voltage input: 4.5V to 5.5V
No internal connection
Power ground
Gate-drive output for the low-side synchronous rectifier MOSFET
Boost capacitor connection (0.1µF)
Inductor connection. Can swing 2V below GND without latchup.
Gate-drive output for the high-side MOSFET
Feedback and current-sense input for the PWM
C4
4.7µF
SHUTDOWN
ON
ON/OFF
R2
10Ω
VCC
BST
DH
0.01µF
C5
SS
(OPTIONAL)
MAX767
SYNC
LX
DL
PGND
CS
REF
C6
0.22µF
FB
GND
Figure 1. Standard Application Circuit
INPUT
4.5V TO 5.5V
D1
C1
SMALL-
SIGNAL
SCHOTTKY
C3
N1
0.1µF
L1
D2
N2
R1
OUTPUT
3.3V
C2
_______________________________________________________________________________________ 5
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