RC5052 查看數據表（PDF） - Fairchild Semiconductor

零件编号

产品描述 (功能)

生产厂家

RC5052

High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors

Fairchild Semiconductor 

RC5052

PRODUCT SPECIFICATION

Pin Assignments

ROSC

ENABLE/SS

PWRGD

IFB

VFB

VCCA

OVP

GNDP

LODRV

VCCP

1

20

2

19

3

18

4

RC5052 1 7

5

16

6

15

7

14

8

13

9

12

10

11

VID0

VID1

VID2

VID3

VID4

DTA

GNDA

SW

HIDRV

VCCQP

Pin Definitions

Pin Number

1

Pin Name

ROSC

2

ENABLE/SS

3

PWRGD

4

IFB

5

VFB

6

VCCA

7

OVP

8

GNDP

9

LODRV

10

11

12

13

14

15

16–20

VCCP

VCCQP

HIDRV

SW

GNDA

DTA

VID0-4

Pin Function Description

Oscillator Resistor Connection. Connect an external resistor to this pin to set

the internal oscillator frequency. Layout of this pin is critical to system

performance. See Application Information for details.

Output Enable/Softstart. A logic LOW on this pin will disable the output. An

internal current source allows for open collector control. This pin also doubles as

soft start.

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

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

Current Feedback. Pin 4 is used in conjunction with pin 13, as the input for the

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

performance. See Application Information for details.

Voltage Feedback. Pin 5 is used as the input for the 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.

Over Voltage Protection. This pin triggers the gate of an external SCR.

Power Ground. Return pin for high currents flowing in pins 10 and 11. Connect

to a low impedance ground.

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".

Power VCC. For low side FET driver. Connect to system 12V supply and

decouple with a 10Ω resistor, 4.7µF tantalum and a 0.1µF ceramic capacitor.

High Side Power VCC. For high side FET driver. Connect to system 12V supply

and decouple with a 10Ω resistor, 4.7µF tantalum and a 0.1µF ceramic capacitor.

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".

High side driver source and low side driver drain switching node. Together

with IFB pin allows FET sensing for 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.

Dead Time Adjust. Connect an external resistor to this pin to set the dead time.

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.

2

REV. 1.3.2 8/27/01

Share Link: