MAX618 查看數據表（PDF） - Maxim Integrated

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MAX618

28V Internal Switch, Step-Up DC-DC Converter

Maxim Integrated 

MAX618

28V Internal Switch, Step-Up DC-DC Converter

Pin Description

PIN

1, 8, 9,

12, 16

2, 3, 4

NAME

GND

LX

5

SHDN

6

COMP

7

FB

10

IN

11

13, 14, 15

VL

PGND

FUNCTION

Ground

Drain of Internal n-channel Switch. Connect the inductor between IN and LX.

Shutdown Input. A logic low puts the MAX618 in shutdown mode and reduces supply current to 3µA.

SHDN must not exceed VL. In shutdown, the output falls to VIN less one diode drop.

Compensation Input. Bypass to GND with the value of capacitance shown in Table 2.

Feedback Input. Connect a resistor-divider network to set VOUT. FB threshold is 1.5V.

LDO Regulator Supply Input. IN accepts inputs up to +28V. Bypass to GND with a 1µF ceramic capacitor

as close to pins 10 and 12 as possible.

Internal 3.1V LDO Regulator Output. Bypass to GND with a 4.7µF capacitor.

Power Ground. Source of internal N-channel switch.

LOW BATTERY INPUT

+5V INPUT

R3

169kΩ

1 LBR

R4

100kΩ

L1

470

MAX618

COMP 2

1.31V

2 CX

OSC

40kHz

COMP 1

D1

1N4148

3 LX

RON

AT 3Ω

4 GND

1.31V

BANDGAP

REFERENCE

AND

BIAS GENERATOR

LBD 8

VFB 7

CC

IC 6

+VS 5

LOW-BATTERY OUTPUT

(LOW IF INPUT < 3V)

R2

47.5kΩ

R1

499kΩ

SHUTDOWN

OPERATE

C1

470mF

25V

+15V OUTPUT

20mA

Figure 1. Single-Supply Operation

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