RC5051M Fairchild Semiconductor, RC5051M Datasheet - Page 2

• Manufacturer Part Number: RC5051M
• Description: DC/DC Switching Controllers DC-DC Converter Prog Sync
• Manufacturer: Fairchild Semiconductor

Specifications of RC5051M

• Number Of Outputs: 1
• Output Voltage: 1.3 V to 3.5 V
• Output Current: 15 A
• Mounting Style: SMD/SMT
• Package / Case: SOIC-20 Wide
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

RC5051
Pin Assignments
Pin Definitions
2
Pin Number Pin Name Pin Function Description
10, 11
17-20
12
13
14
15
16
1
2
3
4
5
6
7
8
9
VID0-VID3 Voltage Identification Code Inputs . These open collector/TTL compatible inputs will
ENABLE
PWRGD
VCCQP
LODRV
HIDRV
GNDD
GNDP
GNDA
VCCA
VCCP
CEXT
VREF
VID4
VFB
IFB
Oscillator Capacitor Connection . Connecting an external capacitor to this pin sets
the internal oscillator frequency. Layout of this pin is critical to system performance.
See Application Information for details.
Output Enable . A logic LOW on this pin will disable the output. An internal pull-up
resistor allows for either open collector or TTL compatibility.
Power Good Flag . An open collector output that will be at logic LOW if the output
voltage is not within 12% of the nominal output voltage setpoint.
High Side Current Feedback . Pins 4 and 5 are used as the inputs 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 and
as the low side current feedback input. See Application Information for details regarding
correct layout.
Analog VCC . Connect to system 5V supply and decouple with a 0.1 F ceramic
capacitor.
Power VCC for low side FET driver . Connect to system 5V supply and place a 1 F
ceramic capacitor for decoupling and local charge storage.
VID4 Input . A logic 1 on this open collector/TTL input will enable the VID3–VID0 inputs
to set the output from 2.1V to 3.5V, and a logic 0 will set the output from 1.3V to 2.05V,
as shown in Table 1. Pullup resistors are internal to the controller.
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 Ground . Return pin for high currents flowing in pins 7 and 13 (VCCP and
VCCQP). Connect to a low impedance ground.
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".
Power VCC . For high side FET driver. VCCQP must be connected to a voltage of at
least VCCA + V
and local charge storage. See Application Information for details
Digital Ground . Return path for digital logic. Connect to a low impedance system
ground plane to minimize ground loops.
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.
Reference Voltage Test point . This pin provides access to the DAC output and should
be decoupled to ground using 0.1 F capacitor. No load should be connected.
program the output voltage over the ranges specified in Table 1. Pull-up resistors are
internal to the controller.
ENABLE
PWRGD
LODRV
GNDP
VCCA
VCCP
CEXT
VID4
VFB
IFB
GS,ON
2
3
4
5
6
7
8
9
10
1
(MOSFET), and place a 1 F ceramic capacitor for decoupling
RC5051
65-5051-02
20
19
18
17
16
15
14
13
12
11
VID0
VID1
VID2
VID3
VREF
GNDA
GNDD
VCCQP
HIDRV
GNDP
PRODUCT SPECIFICATION
REV. 1.0.4 4/2/01