Rainbow-electronics MAX767 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX767

5V-to-3.3V, Synchronous, Step-Down

Power-Supply Controller

_______________________________________________________________________________________ 5

______________________________________________________________Pin Description

NAME FUNCTION

CS Current-sense input: +100mV = nominal current-limit level referred to FB.

2 SS Soft-start input. Ramp time to full current limit is 1ms/nF of capacitance to GND.

3 ON

ON/O

—

–

control input to disable the PWM. Tie directly to V

for automatic start-up.

DL Gate-drive output for the low-side synchronous rectifier MOSFET

4–7, 11 GND Low-current analog ground. Feedback reference point for the output.

8 REF 3.3V internal reference output. Bypass to GND with 0.22µF minimum capacitor.

9 SYNC

Oscillator control/synchronization input. Connect to V

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.

10, 14, 15 V

Supply voltage input: 4.5V to 5.5V

17 BST Boost capacitor connection (0.1µF)

12 N.C. No internal connection

13 PGND Power ground

18 LX Inductor connection. Can swing 2V below GND without latchup.

19 DH Gate-drive output for the high-side MOSFET

20 FB Feedback and current-sense input for the PWM

OUTPUT

3.3V

GND

MAX767

REF

BST

PGND

SHUTDOWN

ON/OFF

SMALL-

SIGNAL

SCHOTTKY

0.1

0.22µF

(OPTIONAL)

SYNC

Ω

INPUT

4.5V TO 5.5V

0.01

4.7

Figure 1. Standard Application Circuit

1 2 3 4 5 6 7 8 9 10 ... 18 19

Power-Supply Controller 1

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