RC5054A Datasheet, PDF (3/13 Pages) Fairchild Semiconductor – Programmable Synchronous DC-DC Converter Controller for Low Voltage Microprocessors

PRODUCT SPECIFICATION
RC5054A
Pin Definitions (continued)
Pin Number Pin Names Pin Function Description
17
LGATE Connect LGATE to the lower MOSFET gate. This pin provides the gate drive for the
lower MOSFET.
18
VCC
Provide a 12V bias supply for the chip to this pin.
19
OVP
The OVP pin can be used to drive an external SCR in the event of an overvoltage
condition.
20
RT
This pin provides oscillator switching frequency adjustment. By placing a resistor
(RT) from this pin to GND, the nominal 200KHz switching frequency is increased
according to the following equation:
F_S = 200kHz + -³--^.--⁵----^×-----¹---R⁰---⁶-_T--^[--_[-K-K---H-o---zh----m-x----_]^{K----o----h---m-----]}-
(R_T to GND)
Conversely, connecting a pull-up resistor (RT) from this pin to VCC reduces the
switching frequency according to the following equation:
F_S = 200kHz – ³-----^×-----¹---⁰--R-⁵---^[_T--K-_[---KH----oz---h--x-m----K--_]--o---h---m------^]
(R_T to 12V)
Absolute Maximum Ratings
Power Input Voltage, VIN
Supply Voltage, VCC
Boot Voltage, VBOOT - VPHASE
VCC or I/O Voltage
ESD Classification
Min.
GND -0.3V
Max.
6V
+13.5V
+13.5V
VCC + 0.3V
Class 2
Recommended Operating Conditions
Supply Voltage, VCC
Ambient Temperature Range
Junction Temperature Range
Min.
+12V -10%
0°C
0°C
Max.
+12V +10%
70°C
125°C
Thermal Characteristics
Parameter
Thermal Resistance¹ θJA
SOIC Package
SOIC Package
Conditions
With 3in² of Copper
Min.
Maximum Junction Temperature
Plastic Package
Maximum Storage Temperature Range
-65
Maximum Lead Temperature
Soldering 10s
NOTE:
1. θJA is measured with the component mounted on an evaluation PC board in free air.
Typ.
110
86
Max.
150
150
300
Units
°C/W
°C/W
°C
°C
°C
3