FAN5038 Datasheet, PDF (3/15 Pages) Fairchild Semiconductor – Dual Voltage Controller for DSP Power

FAN5038
PRODUCT SPECIFICATION
Pin Descriptions (continued)
Pin
Name
GNDA
Pin
Number
14
CEXT
15
SWCTRL 16
Pin Function Description
Analog ground. All low power internal circuitry returns to this pin. This pin should be
connected to system ground so that ground loops are avoided. See Applications Discussion
for details.
External capacitor. A 100pF 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 Discussion for details.
Switching regulator control input. Accepts TTL/open collector input levels. A logic level
HIGH on this pin presets the switching regulator output voltage at 3.5V using internal
resistors. A logic level LOW on this pin will select the output voltage set by two external
resistors and the voltage feedback control pin 5 (VFBSW). See Applications Discussion for
details.
Absolute Maximum Ratings
Supply Voltages, VCCA, VCCL, VCCP
13V
Junction Temperature, TJ
+150°C
Storage Temperature, TS
-65 to +150°C
Lead Soldering Temperature, 10 seconds
300°C
Thermal Resistance Junction-to-Ambient, ΘJA
112°C/W
Note:
1. Functional operation under any of these conditions is not implied. Performance is guaranteed only if Operating Conditions are
not exceeded.
Operating Conditions
Parameter
Conditions
Switching Regulator VCC, VCCA
Linear Regulator VCC, VCCL
Logic Inputs, SWCTRL, LIN_EN
Logic HIGH
Logic LOW
Ambient Operating Temperature, TA
Drive Gate Supply, VCCP
Min.
4.75
11.4
2.4
0
9.5
Typ.
5
12
12
Max.
5.25
12.6
0.8
70
12.6
Units
V
V
V
V
°C
V
3
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