MAX767R データシートの表示（PDF） - Maxim Integrated
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MAX767R Datasheet PDF : 19 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/OFF
ON
R2
10Ω
VCC
BST
DH
0.01µF
C5
SS
(OPTIONAL)
MAX767
SYNC
LX
DL
PGND
CS
REF
C6
0.22µF
FB
GND
INPUT
4.5V TO 5.5V
D1
C1
SMALL-
SIGNAL
SCHOTTKY
C3
N1 0.1µF
L1
D2
N2
R1
OUTPUT
3.3V
C2
Figure 1. Standard Application Circuit
_______________________________________________________________________________________ 5
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