FAN5071 datasheet(2/15 Pages) FAIRCHILD

부품명	FAN5071

상세설명	High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms

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제조업체	FAIRCHILD [Fairchild Semiconductor]

홈페이지	http://www.fairchildsemi.com

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FAN5071

2

REV. 1.0.4 1/29/02

Start and current limiting. The linears start instantly, not

waiting for softstart. The FAN5071 is available in a 24 pin

SOIC package.

Pin Assignments

24

23

22

21

20

19

18

17

16

15

14

13

FAN5071

HIDRV

SW

GNDA

VID4

VID3

VID2

VID1

VID0

VADJGATE

VADJFB

VCKGATE

VCKFB

VCCP

LODRV

GNDP

VCCA

VFB

DROOP

ILIM

PWRGD

SS/ENABLE

TYPEDET

VAGPGATE

VAGPFB

1

2

3

4

5

6

7

8

9

10

11

12

Pin Deﬁnitions

Pin Number

Pin Name

Pin Function Description

1

HIDRV

High Side FET Driver. Connect this pin to the gate of an N-channel MOSFET. The

trace from this pin to the MOSFET gate should be <0.5".

2SW

High Side Driver Source and Low Side Driver Drain Switching Node. Together

with DROOP and ILIM pins allows FET sensing for VCC current.

3

GNDA

Analog Ground. Return path for low power analog circuitry. This pin should be

connected to a low impedance system ground plane to minimize ground loops.

4-8

VID4-0

Voltage Identification Code Inputs. These open collector/TTL compatible inputs

will program the output voltage over the ranges specified in Table 1.

9

VADJGATE

Gate Driver for VADJ Transistor. For Adjustable output.

10

VADJFB

Voltage Feedback for VADJ.

11

VCKGATE

Gate Driver for VCK Transistor. For 2.5V output.

12

VCKFB

Voltage Feedback for VCK.

13

VAGPFB

Voltage Feedback for VAGP.

14

VAGPGATE

Gate Driver for VAGP Transistor. For 3.3/1.5V output.

15

TYPEDET

Type Detect. Sets 3.3V or 1.5V for AGP.

16

ENABLE/SS

Output Enable. A logic LOW on this pin will disable all outputs. An internal current

source allows for open collector control. This pin also doubles as soft start for the

switcher.

17

PWRGD

Power Good Flag. An open collector output that will be logic LOW if any output

voltage is not within ±14% of the nominal output voltage setpoint.

18

ILIM

VCC Current Feedback. Pin 18 is used in conjunction with pin 2 as the input for the

VCC current feedback control loop. Layout of these traces is critical to system

performance. See Application Information for details.

19

DROOP

Droop Set. Use this pin to set magnitude of active droop.

20

VFB

Vcc Voltage Feedback. Pin 20 is used as the input for the VCC voltage feedback

control loop. See Application Information for details regarding correct layout.

21

VCCA

Analog VCC. Connect to system 5V supply and decouple with a 0.1µF ceramic

capacitor.

22

GNDP

Power Ground. Return pin for high currents flowing in pin 24 (VCCP).

23

LODRV

VCC Low Side FET Driver. Connect this pin to the gate of an N-channel MOSFET

for synchronous operation. The trace from this pin to the MOSFET gate should be

<0.5".

24

VCCP

Power VCC. For all FET drivers. Connect to system 12V supply through a 33Ω, and

decouple with a 1µF ceramic capacitor.

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FAN5071 데이터시트(PDF) 2 Page - Fairchild Semiconductor

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유사한 부품 번호 - FAN5071

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