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RC5058 数据表(PDF) 2 Page - Fairchild Semiconductor

部件名 RC5058
功能描述  High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms
Download  18 Pages
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

RC5058 数据表(HTML) 2 Page - Fairchild Semiconductor

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RC5058
PRODUCT SPECIFICATION
2
REV. 1.0.0 6/30/00
of 16A from a 5V source with minimal external circuitry.
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 Drooppermits 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.
Pin Assignments
24
23
22
21
20
19
18
17
16
15
14
13
RC5058
HIDRV
SW
GNDA
VID4
VID3
VID2
VID1
VID0
VTTGATE
VTTFB
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 through a resistor 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
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.
9
VTTGATE
Gate Driver for VTT Transistor. For 1.5V output.
10
VTTFB
Voltage Feedback for VTT.
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 all outputs.
17
PWRGD
Power Good Flag. An open collector output that will be logic LOW if any output voltage
is more than ±12% outside 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 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".
24
VCCP
Power VCC. For all FET drivers. Connect to system 12V supply through a 33
Ω, and
decouple with a 1µF ceramic capacitor.


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