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RC5057 数据表(PDF) 2 Page - Fairchild Semiconductor

部件名 RC5057
功能描述  High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

RC5057 数据表(HTML) 2 Page - Fairchild Semiconductor

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RC5057
PRODUCT SPECIFICATION
2
REV. 1.2.0 2/10/00
Pin Assignments
Pin Definitions
Pin Number
Pin Name
Pin Function Description
1
ENABLE/SS
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.
2
PWRGD
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.
3
IFB
Current Feedback. Pin 3 is used in conjunction with pin 10, as the input for the
current feedback control loop. Layout of these traces is critical to system
performance. See Application Information for details.
4
VFB
Voltage Feedback. Pin 4 is used as the input for the voltage feedback control
loop. See Application Information for details regarding correct layout.
5
VCCA
Analog VCC. Connect to system 5V supply and decouple with a 0.1µF ceramic
capacitor.
6
GNDP
Power Ground. Return pin for high currents flowing in pin 8 (VCCP). Connect to
a low impedance ground.
7
LODRV
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".
8
VCCP
Power VCC. For both high side and low side FET drivers. Connect to system 12V
supply, and decouple with a 4.7µF tantalum and a 0.1µF ceramic capacitor.
9
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".
10
SW
High side driver source and low side driver drain switching node. Together
with IFB pin allows FET sensing for current.
11
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.
12–16
VID0-4
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.
1
2
3
4
5
6
7
8
9
10
11
12
16
15
14
13
RC5057
ENABLE/SS
PWRGD
IFB
VFB
VCCA
GNDP
LODRV
VCCP
VID0
VID1
VID2
VID3
VID4
GNDA
SW
HIDRV


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