MAX8833(2007) Просмотр технического описания (PDF) - Maxim Integrated

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MAX8833
(Rev.:2007)

Dual, 3A, 2MHz Step-Down Regulator

Maxim Integrated 

Dual, 3A, 2MHz Step-Down Regulator

For ratiometric tracking applications, connect REFIN to

the center of a voltage-divider from the output of regula-

tor 2 to GND (see Figure 3b). In this application, the EN_

inputs are connected to each other and driven as a sin-

gle enable input. Regulator 2 starts up with a normal soft-

start (CSS2 sets the time), and regulator 1 output

ratiometrically tracks the regulator 2 output voltage. The

voltage-divider resistors set the VOUT1/VOUT2 ratio (see

the Setting the Output Voltage section). In Figure 3b,

VOUT1 regulates to half of VOUT2. Note that a capaci-

tance of 1000pF should be connected to SS1 for stability.

Figure 3c shows the output sequencing application

using an external reference.

Sequencing is achieved by connecting EN2 to

PWRGD1. In this mode, regulator 2 starts once regulator

1 reaches regulation.

EN

PWRGD1 EN1

EN

10kΩ

OUT2

VDD

EN2

OUT1

10kΩ

PWRGD2

PWRGD2 SS2

PWRGD1

SS1

REFIN

OUT2

10kΩ

10kΩ

Figure 3b. Startup and Sequencing Options—Ratiometric Tracking Startup and Shutdown Waveforms VOUT1 Track VOUT2

EN1

OUT1

10kΩ

PWRGD1

10kΩ

OUT2

PWRGD2

PWRGD1 EN1

EN1

VDD

EN2

SS2

PWRGD2

SS1

REFIN

REFIN

Figure 3c. Startup and Sequencing Options—Sequencing Startup and Shutdown Waveforms with External Reference

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