MAX1980 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1980

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter

Maxim Integrated 

Quick-PWM Slave Controller with

Driver Disable for Multiphase DC-DC Converter

Pin Description

PIN

NAME

DESCRIPTION

1

CM+ Master Controller’s Positive Current-Sense Input

2

CM-

Master Controller’s Negative Current-Sense Input

On-Time Selection Control Input. This is a three-level input used to determine the DH on time (see the

On-Time Control and Active Current Balancing section). Connect TON as follows for the indicated

switching frequencies:

3

TON

GND = 550kHz

floating = 300kHz

VCC = 200kHz.

The slave controller’s switching frequency should be selected to closely match the frequency of the master

PWM controller.

4

CS-

Slave Controller’s Negative Current-Sense Input

5

CS+

Slave Controller’s Positive Current-Sense Input

6

COMP Current Balance Compensation. Connect a series resistor and capacitor between COMP and OUT. See

the Current Balance Compensation section.

7

POL

TRIG Polarity Select Input. Connect POL to VCC or float to trigger on the rising edge of TRIG (out-of-phase

operation). Connect POL to GND to trigger on the falling edge of TRIG (in-phase operation).

8

GND Analog Ground. Connect the QFN’s exposed pad to analog ground.

9

PGND Power Ground

10

DL

Low-Side Gate-Driver Output. DL swings from PGND to VDD. DL is forced low when the MAX1980 enters

standby mode or the drivers are disabled (DD = low).

11

VDD

Supply Voltage Input for the DL Gate Driver. Connect to the system supply voltage (4.5V to 5.5V).

Bypass to PGND with a 1µF or greater ceramic capacitor, as close to the IC as possible.

Analog Supply Voltage Input for PWM Core. Connect VCC to the system supply voltage (4.5V to 5.5V)

12

VCC

through a series 10Ω resistor. Bypass to GND with a 0.22µF or greater ceramic capacitor, as close to

the IC as possible.

Driver Disable Input. A logic low disables the MAX1980 slave controller by forcing DL and DH low. This

13

DD

reduces the number of phases, allowing single-phase operation for low-power states. Connect to VCC

for normal operation.

14

DH

High-Side Gate-Driver Output. DH swings from LX to BST.

15

LX

Inductor Connection. Connect LX to the switched side of the inductor. LX serves as the lower supply rail

for the DH high-side gate driver.

Boost Flying-Capacitor Connection. Connect to an external capacitor and diode according to the

16

BST

Standard Application Circuit (Figure 1). An optional resistor in series with BST allows DH pullup current

to be adjusted.

10 ______________________________________________________________________________________

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