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PDF FAN5230 Data sheet ( Hoja de datos )
| Número de pieza | FAN5230 | |
| Descripción | System Electronics Regulator for Mobile PCs | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FAN5230
System Electronics Regulator for Mobile PCs
Features
• 5.4V to 24V input voltage range
• Five regulated outputs:
• 5V @ 5A (PWM)
• 3.3V @ 5A (PWM)
• 5V @ 50mA Always On (Linear)
• 3.3V @ 50mA Always On (Linear)
• 12V/Adjustable @ 120mA Boost (PWM)
• >96% efficiency
• Hysteretic mode for light loads
• PWM mode for normal loads
• Main regulators switch out of phase
• 300kHz fixed frequency switching
• RDS(ON) current sense over-current
• Reduced BOM; Max. efficiency
• Optional current sense resistor for precision over-current
detect
• Power Good signal for all voltages
• Input under-voltage lock-out (UVLO)
• Thermal shutdown
• ACPI compliant
• 24-pin QSOP
• 2nd source by Intersil (IPM6220)
Applications
• Notebook PCs
• Web tablets
• Battery-powered instruments
Description
The FAN5230 is a high efficiency and high precision
multiple-output voltage regulator for notebook PC and other
similar battery-powered applications. It integrates three
pulse-width modulated (PWM) switching regulator
controllers and two linear regulators to convert 5.4V-to-24V
notebook battery power into the voltage used by the circuitry
that surrounds the microprocessor in these systems.
The two primary PWM controllers in the FAN5230 use
synchronous-mode rectification to provide 3.3V and 5V at
over 5A each. They switch out-of-phase to minimize input
ripple-current. 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
variations. PWM control in normal operation and hysteretic
control under light load provides efficiency of greater than
95% over a wide range of input and output variations. The
third PWM controller generates 12V at 120mA. A propri-
etary technology is used for accurate [± 1%] sensing of out-
put current using the RDS(ON) of the external MOSFETs,
eliminating external current sense resistors which saves
board space and reduces BOM cost.
Two integrated linear regulators provide stand-by ALWAYS-
ON power at 3.3V and 5V for light (50mA) loads. Additional
FAN5230 features include over-voltage, under-voltage, and
over-current monitors and thermal shutdow protection.
A single Power-Good signal is issued when soft start is
completed and all outputs are within ± 10% of their settings.
REV. 2.8.5 10/17/01
1 page  
Operating Conditions (Continued)
Recommended Operating Conditions Unless Noted Refers to Block Diagrams
Parameter
HSD On Output, VCPUMP-VGS
HSD Off Output, VGS
LSD On Output, V5V-Always-VGS
LSD Off Output, VGS
Ramp Amplitude, pk-pk
Ramp Offset
Ramp Gain from VIN
Error Amplifier GBW
Current Limit Threshold
Over Voltage Threshold
Under Voltage Threshold
SDN/SS Full On Voltage Min.
SDN/SS Full Off Voltage Max.
Max Duty Cycle
Min PWM Time
VFB3.3 Input Leakage Current
12V Regulator
Output Voltage Precision
VFB12
VFB12 Input Current
Oscillator Frequency (fosc/3)
Gate Drive On-Resistance
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
Conditions
I = 10µA
I = 10µA
I = 10µA
I = 10µA
VIN = 16V
R2, R8 = 1KΩ
2µs delay
2µs delay
(End of Soft Start)
V_5 =4.9 to 5.1V
and Io=0 to 150mA
Note 2
High or Low
I = 10µA
I = 10µA
2µs delay
Measured at VFB12
(By design)
5.6 to 24V, 0 to 50mA,
5V Main On or Off
I3.3 + I5
2µs delay
2µs delay
0-70°C
FAN5230
Min.
90
110
70
4.2
40
Typ.
2
0.5
125
3
135
115
75
94
200
55
Max.
100
100
100
100
180
120
80
800
70
Units
mV
mV
mV
mV
V
V
mV/V
MHz
µA
%VO
%VO
V
mV
%
nsec
µA
-2 +2 %
2.472
V
100 200
nA
85 100 115 kHz
6 12 Ω
100 mV
100 mV
2V
1 MHz
70 76 80 %VO
115 %VO
0%
32 33 34 %
1.3 1.5
-3.3 2
Ω
%
0 50 mA
100 180
mA
70 75 80 %
-1 1 %
REV. 2.8.5 10/17/01
5
5 Page 
FAN5230
3.3V and 5V Under-voltage Protection
When the output voltage of either the 3.3V or 5V falls
below 75% of the nominal value, both converters, go into
under-voltage (UV) protection, after a 2µsec delay. In under-
voltage protection, the high and low side MOSFETs are
turned off. Once under-voltage protection is triggered, it
remains on until power is recycled or the SDWN pin is reset.
12V Architecture
The 12V converter is a traditional non-isolated fly-back (also
known as a "boost" converter). The converter’s input voltage
is the +5V switcher output, so that +12V can only be present
if +5V is present. Also, if the external MOSFET is off, the
output of the +12V converter is +5V, not zero. This in turn
will provide non-zero output for the 12V regulator.
For complete turn-off of the 12V regulator an external
P-channel MOSFET or an LDO regulator with on/off control
may be used. If an LDO is used for 12V then the boost
converter should be set to 13.2V using the external resistor
divider network. If the 12V “boost” converter is not used,
connect VFB12 (pin 15) to 5V-ALWAYS (pin 6).
12V Loop Compensation
The 12V converter should be run in discontinuous conduc-
tion mode. In this mode, the converter will be stable if a
capacitor with suitable ESR value is selected. A 68uF
tantalum with 500mA ripple current rating and 95mΩ is
recommended here.
12V Protection
The 12V converter is protected against overvoltage. If the
12V feedback is more than 10–15% above the nominal set
voltage, a comparator forces the MOSFET off until the volt-
age falls below the comparator threshold.
The 12V converter is also protected against over-current. If a
short circuit pulls the output below 9V, all of the switching
converters go into UV protection, after a 2µs delay. In UV
protection, all MOSFETs are turned off. Once UV protection
is triggered, it remains on until the input power is recycled or
the SDWN is reset.
5V/3.3V-ALWAYS Operation
The 5V-ALWAYS supply is generated from either the
on-chip linear regulator or through an internal switch from
the VFB pin of the 5V switching supply. The 5V-ALWAYS
supply should be decoupled to ground with a 10µF capacitor.
When the 5V switching supply is off, or if its output voltage
is not within tolerance, the 5V-ALWAYS switch is open, and
the linear regulator is on. When the 5V switching supply is
running and has an output voltage within specification, the
linear regulator is off, and the switch is on. The switch has
sufficiently low resistance that at maximum current draw on
the 5V-ALWAYS supply, the output voltage is regulated
within specifications.
The 3.3V-ALWAYS is generated from a linear regulator
attached internally to the 5V-ALWAYS. The 3.3V-ALWAYS
supply should be decoupled to ground with a 10µF capacitor.
The purpose of the two ALWAYS supplies (combined cur-
rent is specified to never exceed 50mA) is to provide power
to the system micro-controller (8051 class) as well as other
IC’s needing a stand-by power. The micro-controller as well
as the other IC’s could be operated from either 5V or 3.3V
ALWAYS, so the FAN5230 provides both.
5V/3.3V-ALWAYS Protections
The two internal linear regulators are current limited and
under-voltage protected. Once protection is triggered all
outputs are turned off until power is cycled or the SDWN is
reset.
Power good
Power good is asserted when both PWM Buck converters are
above specified threshold. No other regulators are monitored
by Power good. When PGOOD goes low it will stay low for
at least 10µsec (Tw). See fig. 5.
Vmain
Vth
12V Softstart and Sequencing
The 12V output is started at the same time as the 5V output.
The softly rising 5V output automatically generates a softly
rising 12V output. The duty cycle of the 12V PWM is lim-
ited to prevent excessive current draw.
The 12V supply must build up a voltage higher than the
UVLO limit (9V) by the time the 5V is above its UVLO
(3.75V) in order to avoid triggering of UV protection during
soft start.
PGOOD
t
t
Tw
Figure 5. PGOOD Timing Diagram
REV. 2.8.5 10/17/01
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet FAN5230.PDF ] | |
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