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PDF FAN5235 Data sheet ( Hoja de datos )
| Número de pieza | FAN5235 | |
| Descripción | System Electronics Regulator for Mobile PCs | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FAN5235
System Electronics Regulator for Mobile PCs
Features
• Synchronous rectification
• ±1% precision internal reference
• >90% efficiency
• Input and output voltage feedback
• 5.4V to 24V input voltage range
• Internally set 300kHz ±15% oscillator
• 5V and 3.3V Main outputs switch out of phase
• 5V-ALWAYS and 3.3V-ALWAYS outputs
• Adjustable boost converter for 12V
• Boost converter slaved to 5V Main
• Input UVLO
• Outputs OVP of Buck Converters
• Precision current limit option for 5V, 3.3V Main
• Power Good Voltage Monitor
Applications
• Notebook PCs and PDAs
• Hand-held portable instruments
Description
The FAN5235 is a high efficiency and high precision
DC/DC controller for notebook converters. Utilization of
both input and output voltage feedback in a current-mode
control allows for fast and stable loop response over a wide
range of input and output voltage variations. The two main
regulators switch out of phase to minimize input ripple
current.
Current sense based on MOSFET Rdson gives maximum
efficiency, while also permitting use of a sense resistor for
high accuracy. An externally adjustable boost converter can
be set to generate 12V.
The FAN5235 is available in a 24-pin QSOP package, and in
a 24-pin TSSOP package.
Typical Application
3.3V-ALWAYS@50mA
5V-ALWAYS
3.3V @ 5A
+
5V-ALWAYS@ 50mA
SDN3.3
PGOOD
Vin = 5.4-24V
FAN5235
1 VIN
CPUMP5 24
2 3.3 ALW
HSD5 23
3 CPUMP3.3
SW5 22
4 HSD3.3
ISEN5 21
5 SW3.3
6 5V-ALW
7 LSD3.3
8 GND3.3
9 ISEN3.3
LSD5 20
GND5 19
VFB5 18
SDN5 17
SW12 16
10 VFB3.3
11 SDN3.3
12 PGOOD
VFB12 15
SGND 14
SDWN 13
SDN5
VFB12
SDWN
5V-ALWAYS
5V @ 5A
+
12V @ 120mA
+
REV. 1.3.3 1/3/02
1 page  
FAN5235
Operating Conditions (Continued)
Recommended Operating Conditions Unless Noted Refers to Block Diagrams
Parameter
12V Regulator (Continued)
On Output, V5V-Always-VGS
Off Output, VGS
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, tj
Over-temperature Hysteresis
PGOOD Threshold
PGOOD Sink Current
PGOOD leakage
+5V Analog Softstart
+3.3V Analog Softstart
Soft Start Current
PGOOD Min Pulse Width
Conditions
Min. Typ. Max. Units
I = 10µA
I = 10µA
2µs delay
Measured at VFB12
(By design)
100 mV
100 mV
2V
1 MHz
70 76 80 %VO
115 %VO
0%
32 33 34 %
1.3 1.5
Ω
5.6 to 24V, 0 to 50mA,
5V Main On or Off
-3.3
2%
I3.3 + I5
2µs delay
0 50 mA
100 180
mA
2µs delay
70 75 80 %
0-70°C
-1
1%
800 mV
3V
150 °C
25 °C
PWM Buck Converters
-14
-11
-8.5 %VO1
-4 mA
1 µA
Css=100nF
65 msec
Css=100nF
65 msec
5 µA
Note 2
5 10
µs
Notes
1. The minimum input voltage does not include voltage drop in the source supply due to source resistance. It is operating voltage
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.
2. Min/Max specifications are guaranteed by design.
REV. 1.3.3 1/3/02
5
5 Page 
FAN5235
Notebook Application Circuit
5.4-24V
C1
3.3V@50mA
C10
C2
1
2
5V@50mA
3.3V@5A
C11 D5
L1 C5 Q1
+
C12, C13
D1
Q2
R2
3
4
5
6 U1
7 FAN5235
8
9
10
SDN3.3
C3
+5V
11
12
R1
PGOOD
24
23
22
21
20
19
18
17
16
15
14
13
Q3
R3
Pin 6
D4
C6
D2
Q4
L2
L3
C7 C8 5V@5A
+
SDN5 R6
D3
Q5 C9
SDWN
C4
12V@120mA
R4
R5
Figure 8. FAN5235 Notebook Application Circuit
Table 1. FAN5235 Application Bill of Materials
Reference Manufacturer, Part #
Quantity
C1 SANYO
25SP33M
1
C2-6
C7-8
C12-13
C10-11
C9
R1
R2, R3
R4, R5
R6
D1-3
D4-5
L1-2
L3
Q1-4
Q5
U1
Any
KEMET
T510X337(1)010AS
AVX*020R1800TPSA475
AVX
TPSV68*025R0095
Any
Any
Any
Any
Fairchild SS22
Fairchild MBR0520L
Any
Any
Fairchild FDS6690A
Fairchild NDC631N
Fairchild FAN5235
5
2
2
2
1
1
2
1
1
3
2
2
1
4
1
1
Description
33µF, 25V
100nF, 50V
330µF, 10V
4.7µF, 20V
68µF, 25V,
ESR=95mΩ
10KΩ, 1%
1KΩ, 1%
380KΩ, 100KΩ
10Ω
2A, 40V Schottky
500mA, 20V Schottky
6.4µH, 5A
5.6µH, 2A
30V N-channel MOSFET
20V N-channel MOSFET
SER Controller
Comments
OSCON,
Irms = 3A,
19V adapter.
Ceramic
Tantalum,
ESR=35mΩ
Tantalum, ESR=1.8Ω
Tantalum,
Irms = 0.5A
1%
R < 25mΩ
R = 17mΩ
R = 60mΩ
11 REV. 1.3.3 1/3/02
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet FAN5235.PDF ] | |
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