MAX17083 Просмотр технического описания (PDF) - Maxim Integrated

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MAX17083

Low-Voltage, Internal Switch, Step-Down Regulator

Maxim Integrated 

Low-Voltage, Internal Switch,

Step-Down Regulator

PIN

1, 2, 17, 18

3, 4

5

6

7

8, 9, 10

11, 19, 24

12

13

NAME

LX

IN

FREQ

Pin Description

FUNCTION

Inductor Connection for the Internal 5A Step-Down Converter. Connect LX to the switched side of

the inductor.

Power Input Connection to the Drain of the Internal HS MOSFET. Bypass to PGND with a 10μF or

greater ceramic capacitor close to the IC to minimize parasitic inductance.

Four-Level Switching Frequency (fSW) Selection Pin

FREQUENCY PIN

SWITCHING FREQUENCY (MHz)

VCC

1.5

OPEN

1.0

REF

0.75

GND

0.5

POK

REF

GND

N.C.

FB

SET

Open-Drain Power-Good Output. POK is pulled low if FB is more than 12% (typ) above or below the

nominal regulation threshold. POK is held low during soft-start and in shutdown. POK becomes

high impedance when FB is in regulation.

1.25V Reference Voltage Output. Bypass REF to analog ground with a 0.1μF ceramic capacitor.

The reference sources up to 50μA for external loads. Loading REF degrades output voltage

accuracy according to the REF load regulation error.

Analog Ground

No Connection

Feedback Input for the Internal 5A Step-Down Converter. FB regulation level can be preset by the

SET pin.

Four-Level FB Threshold Selection Pin

FB THRESHOLD SELECTION PIN

VCC

OPEN

REF

GND

FB REGULATION VOLTAGE (V)

1.8

1.5

1.1

0.75

14

15

16

20–23

EP

VCC

EN

BST

PGND

GND

5V Bias Supply Input for the Internal Switching Regulator Drivers. Bypass with a 1μF or greater

ceramic capacitor. Provides power for the BST driver supplies.

Switching Regulator Enable Input. When EN is pulled low, LX is high impedance. When EN is

driven high, the controller enables the 5A internal switching regulator.

Boost Flying Capacitor Connection for the Internal 5A Step-Down Converter. The MAX17083

includes an internal boost switch/diode connected between VCC and BST. Connect to an external

0.1μF ceramic capacitor as shown in Figure 1.

Power Ground

Ground. Connect the exposed backside pad to analog ground.

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