RC5058(1999) データシートの表示（PDF） - Fairchild Semiconductor

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RC5058
(Rev.:1999)

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

Fairchild Semiconductor 

RC5058

of 16A from a 5V source with minimal external circuitry.

Pin Assignments

Synchronous-mode operation offers optimum efficiency over

the entire specified output voltage range. An on-board precision

low TC reference achieves tight tolerance voltage regulation

without expensive external components, while Programmable

Active Droop™ permits exact tailoring of voltage for the most

demanding load transients. The RC5058 includes linear regulator

controllers for Vtt termination (1.5V), Vclock (2.5V), and

Vnorthbridge (1.8V) or Vagp (selectable 1.5V/3.3V), each adjust-

able with an external divider. The RC5058 also offers integrated

functions including Power Good, Output Enable/Soft Start and

current limiting, and is available in a 24 pin SOIC package.

HIDRV

1

24

SW

2

23

GNDA

3

22

VID4 4

21

VID3

5

20

VID2

6

VID1 7

RC5058 19

18

VID0

8

17

VTTGATE

9

16

VTTFB

10

15

VCKGATE

11

14

VCKFB

12

13

VCCP

LODRV

GNDP

VCCA

VFB

DROOP

ILIM

PWRGD

SS/ENABLE

TYPEDET

VAGPGATE

VAGPFB

Pin Definitions

Pin

Number

1

2

3

4-8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

Pin Name

HIDRV

SW

GNDA

VID0-4

VTTGATE

VTTFB

VCKGATE

VCKFB

VAGPFB

VAGPGATE

TYPEDET

ENABLE/SS

PWRGD

ILIM

DROOP

VFB

VCCA

GNDP

LODRV

VCCP

Pin Function Description

High Side FET Driver. Connect this pin through a resistor to the gate of an N-channel

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

High side Driver Source and Low side Driver Drain Switching Node. Together with

DROOP and ILIM pins allows FET sensing for Vcc current.

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.

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

program the output voltage over the ranges specified in Table 2. Pull-up resistors are

internal to the controller.

Gate Driver for VTT Transistor. For 1.5V output.

Voltage Feedback for VTT.

Gate Driver for VCK Transistor. For 2.5V output.

Voltage Feedback for VCK.

Voltage Feedback for VAGP.

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

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

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 all outputs.

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

is not within ±12% of the nominal output voltage setpoint.

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.

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

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.

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

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

Vcc Low Side FET Driver. Connect this pin through a resistor to the gate of an N-channel

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

be <0.5".

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

decouple with a 1µF ceramic capacitor.

2

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