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FAN5234 Datasheet(PDF) 1 Page - Fairchild Semiconductor

No. de pieza FAN5234
Descripción Electrónicos  Mobile-Friendly PWM/PFM Controller
Download  15 Pages
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5234 Datasheet(HTML) 1 Page - Fairchild Semiconductor

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REV. 1.0.10 5/3/04
Features
•Wide input voltage range (2 to 24V) for Mobile systems
• Excellent dynamic response with Voltage Feed-Forward
and Average Current Mode control
• Lossless current sensing on low-side MOSFET or
precision over-current using sense resistor
• VCC Under-voltage Lockout
•Power-Good Signal
• Light load Hysteretic mode maximizes efficiency
• QSOP16, TSSOP16
• 300Khz or 600Khz operation
Applications
• Mobile PC regulator
• Hand-Held PC power
General Description
The FAN5234 PWM controller provides high efficiency and
regulation with an adjustable output from 0.9V to 5.5V that
are required to power I/O, chip-sets, memory banks or
peripherals in high-performance notebook computers, PDAs
and Internet appliances. Synchronous rectification and
hysteretic operation at light loads contribute to a high
efficiency over a wide range of loads. The hysteretic mode of
operation can be disabled if PWM mode is desired for all
load levels. Efficiency is even further enhanced by using
MOSFET’s RDS(ON) as a current sense component.
Feed-forward ramp modulation, average current mode
control, and internal feedback compensation provide fast
response to load transients. The FAN5234 monitors these
outputs and generates a PGOOD (power good) signal when
the soft-start is completed and the output is within ±10% of
its set point. A built-in over-voltage protection prevents the
output voltage from going above 120% of the set point.
Normal operation is automatically restored when the over-
voltage conditions go away. Under-voltage protection latches
the chip off when the output drops below 75% of its set value
after the soft-start sequence is completed. An adjustable
over-current function monitors the output current by sensing
the voltage drop across the lower MOSFET.
Typical Application
Figure 1. 1.8V Output Regulator (see Table 2, page 12 for BOM)
SW
FAN5234
10
C6
L1
Q1B
14
ILIM
1
4
R1
R2
11
VCC
+5
D1
+5
15
13
R3
12
C4
8
R5
PGOOD
2
+5
9
ISNS
PGND
Q1A
6
VSEN
LDRV
HDRV
BOOT
VIN
C5
C1
1.8V@ 3.5A
R4
VIN (BATTERY)
= 2 to 24V
C2
AGND
EN
3
SS1
7
C3
16
FPWM
VOUT
5
FAN5234
Mobile-Friendly PWM/PFM Controller


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