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參數資料
| 型號： | FAN5234 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Terminal Block; Pitch Spacing:0.197"; Mounting Type:PC Board RoHS Compliant: Yes |
| 中文描述： | 移動友好的PWM / PFM控制器 |
| 文件頁數： | 1/15頁 |
| 文件大小： | 537K |
| 代理商： | FAN5234 |
www.fairchildsemi.com
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 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 ±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
相關PDF資料 |
PDF描述 |
|---|---|
| FAN5235 | System Electronics Regulator for Mobile PCs |
| FAN5236MTC | Dual Mobile-Friendly DDR / Dual-output PWM Controller |
| FAN5236MTCX | Dual Mobile-Friendly DDR / Dual-output PWM Controller |
| FAN5236QSC | Dual Mobile-Friendly DDR / Dual-output PWM Controller |
| FAN5236QSCX | Dual Mobile-Friendly DDR / Dual-output PWM Controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN5234_10 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Dual Mobile-Friendly PWM / PFM Controller |
| FAN5234MTC | 功能描述:開關變換器、穩壓器與控制器 PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| FAN5234MTC_Q | 功能描述:開關變換器、穩壓器與控制器 PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| FAN5234MTCX | 功能描述:開關變換器、穩壓器與控制器 PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| FAN5234QSC | 功能描述:開關變換器、穩壓器與控制器 PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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