ADP3155 데이터 시트보기 (PDF) - Analog Devices

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ADP3155

5-Bit Programmable Triple Power Supply Controller for Pentium® III Processors

Analog Devices 

Pin No.

1–4, 20

Mnemonic

VID1–VID4,

VID0

5

AGND

6

SD

7, 14

FB1, FB2

8, 13

9

VLDO1, VLDO2

SENSE–

10

SENSE+

11

CT

12

CMP

15

PWRGD

16

VCC

17

DRIVE2

18

DRIVE1

19

PGND

ADP3155

PIN FUNCTION DESCRIPTIONS

Function

Voltage Identification DAC Inputs. These pins are pulled up to an internal reference, providing a

Logic 1 if left open. The DAC output programs the SENSE– regulation voltage from 1.3 V to 3.5 V.

Leaving all five DAC inputs open results in placing the ADP3155 into shutdown.

Analog Ground. All internal signals of the ADP3155 are referenced to this ground.

Shutdown. A logic high will place the ADP3155 in shutdown and disable both outputs. This pin is

internally pulled down.

These pin are the feedback connections for the linear controllers. Connect each pin to the resistor

divider from each respective linear regulator output to set its output voltage.

Gate drives for the respective linear regulator N-channel MOSFETs.

Connects to the internal resistor divider that senses the output voltage. This pin is also the reference

input for the current comparator.

The (+) input for the current comparator. The output current is sensed as a voltage at this pin with

respect to SENSE–.

External capacitor CT connection to ground sets the off time of the device.

Error Amplifier output and compensation point. The voltage at this output programs the output cur-

rent control level between the SENSE pins.

Power Good. An open drain signal indicates that the output voltage is within a ± 5% regulation band.

Supply Voltage to ADP3155.

Gate Drive for the (bottom) synchronous rectifier N-channel MOSFET. The voltage at DRIVE2

swings from ground to VCC.

Gate Drive for the buck switch N-channel MOSFET. The voltage at DRIVE1 swings from ground to

VCC.

Power Ground. The drivers turn off the buck and synchronous MOSFETs by discharging their gate

capacitances to this pin. PGND should have a low impedance path to the source of the synchronous

MOSFET.

ABSOLUTE MAXIMUM RATINGS*

Input Supply Voltage (VCC) . . . . . . . . . . . . . . –0.3 V to +16 V

Shutdown Input Voltage . . . . . . . . . . . . . . . . –0.3 V to +16 V

Operating Ambient Temperature Range . . . . . 0°C to +70°C

Junction Temperature Range . . . . . . . . . . . . . 0°C to +150°C

θJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110°C/W

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . +300°C

*This is a stress rating only; operation beyond these limits can cause the device to

be permanently damaged.

ORDERING GUIDE

Model

ADP3155JRU

Temperature

Range

0°C to +70°C

Package

Description

Package

Option

Thin Shrink Small RU-20

Outline (TSSOP)

PIN CONFIGURATION

VID1 1

20 VID0

VID2 2

19 PGND

VID3 3

18 DRIVE1

VID4 4

17 DRIVE2

AGND 5 ADP3155 16 VCC

SD

6

TOP VIEW 15

(Not to Scale)

PWRGD

FB1 7

14 FB2

VLDO1 8

SENSE– 9

13 VLDO2

12 CMP

SENSE+ 10

11 CT

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the ADP3155 features proprietary ESD protection circuitry, permanent damage may

occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

REV. A

–3–

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