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RC5057
PRODUCT SPECIFICATION
2
Pin Assignments
Pin Definitions
Pin Number
1
Pin Name
ENABLE/SS
Pin Function Description
A logic LOW on this pin will disable the output. An
Output Enable/Softstart.
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 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.
Voltage Feedback.
Pin 4 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.
Power Ground.
Return pin for high currents flowing in pin 8 (VCCP). 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 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.
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.
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.
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
PWRGD
3
IFB
4
VFB
5
VCCA
6
GNDP
7
LODRV
8
VCCP
9
HIDRV
10
SW
Together
11
GNDA
12–16
VID0-4
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