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PRODUCT SPECIFICATION
RC5037
3
P
Pin Assignments
Absolute Maximum Ratings
Note:
1. Functional operation under any of these conditions is not implied. Performance is guaranteed only if Operating Conditions
are not exceeded.
Pin Descriptions
Pin
Name
CEXT
Pin
Number
1
Pin Function Description
External capacitor.
A 180pF capacitor is connected to this pin as part of the constant
on-time pulse width circuit. Careful layout of this pin is critical to system performance.
See Applications Information for details.
Switching Regulator V
cc
.
Power supply for switching regulator control circuitry and
voltage reference. Connect to system 5V supply and decouple to ground with 0.1
m
F
ceramic capacitor.
High side current feedback for switching regulator.
Pins 3 and 4 are used as the inputs
for the current feedback control loop and as the short circuit current sense points. Careful
layout of the traces from these pins to the current sense resistor is critical for optimal
performance of the short circuit protection scheme. See Applications Information for details.
Low side current feedback for switching regulator.
See Applications Information for
details.
Voltage feedback for switching regulator.
Using two external resistors, this pin sets the
output voltage level for the switching regulator.
Power Ground.
Connect to a low impedance ground. See Application Information for
details.
FET driver output for switching regulator.
Connect this pin to the gate of the N-channel
MOSFET Q1 as shown in Figure 12. The trace from this pin to the MOSFET gate should be
kept as short as possible (less than 0.5"). See Applications Information for details.
Switching regulator gate drive V
cc
.
Power supply for SDRV output driver. Connect to
system 12V supply with R-C filter shown in Figure 12. See Applications Information for
details.
VCCA
2
IFBH
3
IFBL
4
FBSW
5
GNDP
6
SDRV
7
VCCP
8
Supply Voltages, VCCA
Supply Voltages, VCCP
Junction Temperature, T
J
Storage Temperature, T
S
Lead Soldering Temperature, 10 seconds
7V
13V
+150
°
C
-65 to +150
°
C
300
°
C
CEXT
VCCA
IFBH
VCCP
SDRV
GNDP
1
2
3
8
7
6
IFBL
FBSW
RC5037
4
5