Rainbow-electronics MAX17083 Bedienungsanleitung PDF herunterladen (Seite 8)

MAX17083

Low-Voltage, Internal Switch,

Step-Down Regulator

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Detailed Description

The MAX17083 standard application circuit (Figure 1)

provides a single 1.1V/5A chipset supply. The

MAX17083 features a step-down switching regulator

with dual internal n-channel MOSFET power switches.

These step-down regulators use a fixed-frequency, cur-

rent-mode control scheme compensated by the output

capacitor, providing an easy-to-implement architecture

without sacrificing fast transient response. These regu-

lators also provide peak current-limit protection, and

operate pulse-skipping mode at light loads to maintain

high efficiency.

Independent enable input and open-drain power-good

output allow flexible system power sequencing. The

voltage soft-start gradually ramps up the output voltage

within a predictable time period and reduces inrush

current. The MAX17083 features outputs undervoltage,

output overvoltage, and thermal-fault protection.

Reference (REF)

The 1.25V reference is accurate to ±1% over tempera-

ture and load, making REF useful as a precision system

reference. Bypass REF to GND with a 0.1µF or greater

ceramic capacitor. The reference sources up to 50µA

and sinks 5µA to support external loads. If highly accu-

rate specifications are required for the main SMPS out-

put voltages, the reference should not be loaded.

Loading the reference slightly reduces the output volt-

age accuracy because of the reference load-regulation

error as defined in the

Electrical Characteristics

table.

1μF

0.1μF

SET

OFFON

5V INPUT

1μH

OUTPUT

1.1V AT 5A

GND (EP)

FREQ

(OPEN)

REF

BST

OUT

2x 10μF

OUT

220μF, 6 mΩ

BST

0.1μF

100kΩ

POK

SET

FB REGULATION

VOLTAGE (V)

1.8

OPEN 1.5

REF 1.1

GND 0.75

MAX17083

FREQ

SWITCHING

FREQUENCY (MHz)

CC 1.5

OPEN 1.0

REF 0.75

GND 0.5

Figure 1. Standard Application Circuit

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