FAN5038 Datasheet, PDF (4/15 Pages) Fairchild Semiconductor – Dual Voltage Controller for DSP Power

PRODUCT SPECIFICATION
FAN5038
Electrical Characteristics—Switch-Mode Regulator
(VCCA = 5V, VCCL = 12V, TA = 25°C using circuit of Figure 1, unless otherwise noted)
The • denotes specifications which apply over the full ambient operating temperature range.
Parameter
Output Voltage, VOSW¹
Output Voltage, VOSW¹
Setpoint Accuracy²
Output Temperature Drift
Line Regulation
Load Regulation
Output Ripple, peak-peak
Cumulative DC Accuracy³
Efficiency
Output Driver Current
Short Circuit Threshold
Voltage
On Time Pulse Width⁴
Conditions
SWCTRL = HIGH
Set by internal resistors
SWCTRL = LOW
Set by external resistors
ISW = 4A
TA = 0°C–70°C
VCCA = 4.75 to 5.25V
ISW = 4A
ISW = 0 to 4A
20MHz BW, ISW = 4A
ISW = 4A
Open Loop
CEXT = 100pF
Min.
•
• 1.5
-1.2
•
•
• 0.5
•
70
Typ.
3.5
40
0.10
±0.9
15
±55
80
90
2
Max.
3.6
+1.2
0.15
±1.3
±100
100
Units
V
V
%Vo
ppm
%Vo
%Vo
mV
mV
%
A
mV
µs
Notes:
1. When the SWCTRL pin is HIGH or left open, the switch-mode regulator output will be preset at 3.5V using internal precision
resistors. When the SWCTRL pin is LOW, the output voltage may be programmed with external resistors. Please refer to
the Applications Section for output voltage selection information.
2. Setpoint accuracy is the initial output voltage variability under the specified conditions. When SWCTRL is LOW, the matching
of the external resistors will have a major influence on this parameter.
3. Cumulative DC accuracy includes setpoint accuracy, temperature drift, line and load regulation, and output ripple.
4. The on-time pulse width of the oscillator is preset using external capacitor CEXT. See Typical Operating Characteristics
curves.
REV. 1.0.2 7/6/00
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