MAX8566 Просмотр технического описания (PDF) - Maxim Integrated

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MAX8566

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator

Maxim Integrated 

PIN

1

2

3

4

5–12

13–17

18–22

23

24

25

26

27

28

29

30

31

32

—

High-Efficiency, 10A, PWM

Internal-Switch Step-Down Regulator

Pin Description

NAME

MODE

COMP

PWRGD

BST

LX

PGND

IN

LSS

VDD

REFIN

SS

EN

SYNC

FREQ

SYNCOUT

GND

FB

EP

FUNCTION

Monotonic Startup Enable/Disable. Connect MODE to GND or to the center tap of an external

resistor-divider to enable/disable monotonic startup mode.

Error-Amplifier Output. Connect the necessary compensation network from COMP to FB. COMP is

internally pulled to GND when the IC is in shutdown mode.

Power-Good Output. Open-drain output that is high impedance when VFB
90% of 0.6V. Otherwise,

PWRGD is internally pulled low. PWRGD is internally pulled low when the IC is in shutdown mode,

VDD is below the UVLO threshold, or the IC is in thermal shutdown.

High-Side MOSFET Driver Supply. Bypass BST to LX with a 0.1µF capacitor. BST is connected to

LSS through an internal pMOS switch.

Inductor Connection. All LX pins are internally connected together. Connect all LX pins to the

switched side of the inductor. LX is high impedance when the IC is in shutdown mode.

Power Ground. All PGND pins are internally connected. Connect all PGND pins externally to the

power ground plane.

Input Power Supply. All IN pins are internally connected. Connect all IN pins externally to an input

supply from 2.3V to 3.6V. Bypass IN to PGND with 20µF of ceramic capacitance.

Low-Side MOSFET-Driver Supply Voltage. Connect LSS to a 2.3V to 3.6V supply voltage.

IC Supply Voltage Input. Connect VDD to IN through an external 2 resistor. Bypass VDD to GND

with a 4.7µF capacitor.

External Reference Input. Connect to an external reference. FB regulates to the voltage at REFIN.

Connect REFIN to SS to use the internal reference.

Soft-Start Input. Connect a capacitor from SS to GND to set the soft-start time. See the Soft-Start and

REFIN section.

Enable Input. Active-high logic input to enable/disable the MAX8566. Connect EN to IN to enable

the IC. Connect EN to GND to disable the IC.

Synchronization Input. Synchronize to an external clock with a frequency of 250kHz to 2.4MHz.

Leave SYNC unconnected to disable the synchronization function.

Oscillator Frequency Selection. Connect a resistor from FREQ to GND to select the switching

frequency. See the Frequency Select (FREQ) section.

Oscillator Output. The SYNCOUT output is 180° out-of-phase from the internal oscillator or the

SYNC signal to facilitate running a second regulator 180° out-of-phase with the first to reduce input

ripple current.

Analog Circuit Ground

Feedback Input. Connect FB to the center tap of an external resistor-divider from the output to GND

to set the output voltage.

Exposed Pad. Internally connected to GND. Connect to a large ground plane to maximize thermal

performance. Not indented as an electrical connection point.

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