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FAN5234QSCX Datasheet

  • FAN5234QSCX

  • Mobile-Friendly PWM/PFM Controller

  • 538.02KB

  • 15頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN5234
Mobile-Friendly PWM/PFM Controller
Features
鈥?Wide input voltage range (2 to 24V) for Mobile systems
鈥?Excellent dynamic response with Voltage Feed-Forward
and Average Current Mode control
鈥?Lossless current sensing on low-side MOSFET or
precision over-current using sense resistor
鈥?VCC Under-voltage Lockout
鈥?Power-Good Signal
鈥?Light load Hysteretic mode maximizes ef鏗乧iency
鈥?QSOP16, TSSOP16
鈥?300Khz or 600Khz operation
General Description
The FAN5234 PWM controller provides high ef鏗乧iency 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 recti鏗乧ation and
hysteretic operation at light loads contribute to a high
ef鏗乧iency over a wide range of loads. The hysteretic mode of
operation can be disabled if PWM mode is desired for all
load levels. Ef鏗乧iency is even further enhanced by using
MOSFET鈥檚 R
DS(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 鹵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.
Applications
鈥?Mobile PC regulator
鈥?Hand-Held PC power
Typical Application
VIN (BATTERY)
= 2 to 24V
1
VCC
VIN
BOOT
C1
D1
+5
C5
L1
Q1B
10
9
12
LDRV
PGND
ISNS
VSEN
VOUT
15
C2
+5
C4
11
FAN5234
R5
14
ILIM
EN
SS1
4
3
7
16
8
6
2
5
13
SW
Q1A
HDRV
1.8V@3.5A
C6
R1
R3
C3
+5
R4
FPWM
AGND
PGOOD
R2
Figure 1. 1.8V Output Regulator (see Table 2, page 12 for BOM)
REV. 1.0.10 5/3/04

FAN5234QSCX 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 控制器，移動式個人電腦

  • 2 V ~ 24 V

  • 1

  • 0.9 V ~ 5.5 V

  • -10°C ~ 85°C

  • 表面貼裝

  • 16-SSOP（0.154"，3.90mm 寬）

  • 16-QSOP

  • 帶卷 (TR)

  • FAN5234QSCXTRFAN5234QSCX_NLFAN5234QSCX_NLTRFAN5234QSCX_NLTR-ND

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