FAN5235 Fairchild Semiconductor, FAN5235 Datasheet - Page 5

• Manufacturer Part Number: FAN5235
• Description: System Electronics Regulator for Mobile PCs
• Manufacturer: Fairchild Semiconductor

Operating Conditions
Recommended Operating Conditions Unless Noted Refers to Block Diagrams
Notes
1. The minimum input voltage does not include voltage drop in the source supply due to source resistance. It is operating voltage
2. Min/Max specifications are guaranteed by design.
REV. 1.3.3 1/3/02
Parameter
12V Regulator (Continued)
On Output, V
Off Output, V
Ramp Amplitude, pk-pk
Error Amplifier GBW
Under Voltage Shut Down
Over Voltage Shut Down
Min Duty Cycle
Max Duty Cycle
5V and 3.3V Always
Bypass Switch rdson
Linear Regulator Accuracy
Rated Output Current
Over-current Limit
Under-voltage Threshold
Reference
Internal Reference Accuracy
Control Functions
SDWN Off Voltage Max.
SDWN On Voltage Min.
Over-temperature Shutdown, t
Over-temperature Hysteresis
PGOOD Threshold
PGOOD Sink Current
PGOOD leakage
+5V Analog Softstart
+3.3V Analog Softstart
Soft Start Current
PGOOD Min Pulse Width
for static load conditions. To get acceptable load transient performance, the input voltage required will be much higher, in the
7.5 to 8.5 volt range or even higher depending on the severity of dynamic load, source impedance and input and output
capacitance and inductor values. The user should thoroughly test the performance at minimum input voltage using intended
component values and transient loading.
5V-Always
GS
-V
GS
(Continued)
j
PWM Buck Converters
5.6 to 24V, 0 to 50mA,
Measured at VFB
5V Main On or Off
Conditions
Css=100nF
Css=100nF
(By design)
2µs delay
2µs delay
2µs delay
I = 10µA
I = 10µA
I
0-70°C
Note 2
3.3
+ I
5
12
Min.
-3.3
100
-14
70
32
70
-1
-4
0
0
3
5
Typ.
115
180
150
1.3
-11
76
33
75
25
65
65
10
2
1
5
Max.
100
100
800
-8.5
1.5
80
34
50
80
2
1
1
FAN5235
Units
%V
msec
msec
%V
%V
MHz
mV
mV
mA
mA
mV
mA
µA
µA
°C
°C
µs
%
%
%
%
%
V
V
O
O
O
1
5