FAN5234

更新时间： 2024-11-27 22:50:59

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		控制器
页数	文件大小	规格书
15页	538K
描述
Mobile-Friendly PWM/PFM Controller

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中文翻译

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数据手册

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FAN5234 数据手册

www.fairchildsemi.com

FAN5234

Mobile-Friendly PWM/PFM Controller

Features

General Description

• 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

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.

• 300Khz or 600Khz operation

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 10ꢀ of

its set point. A built-in over-voltage protection prevents the

output voltage from going above 120ꢀ 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 75ꢀ 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

• Mobile PC regulator

• Hand-Held PC power

Typical Application

VIN (BATTERY)

= 2 to 24V

VIN

VCC

BOOT

Q1A

FAN5234

HDRV

ILIM

1.8V@3.5A

Q1B

LDRV

SS1

PGND

ISNS

FPWM

AGND

VSEN

VOUT

PGOOD

Figure 1. 1.8V Output Regulator (see Table 2, page 12 for BOM)

REV. 1.0.10 5/3/04

12 3 4 5 6 7...15

中文翻译

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与FAN5234相关器件

型号	品牌	获取价格	描述	数据表
FAN5234_10	FAIRCHILD	获取价格	Dual Mobile-Friendly PWM / PFM Controller
FAN5234MTC	FAIRCHILD	获取价格	Mobile-Friendly PWM/PFM Controller
FAN5234MTC	ROCHESTER	获取价格	SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16
FAN5234MTCX	FAIRCHILD	获取价格	Mobile-Friendly PWM/PFM Controller
FAN5234MTCX	ROCHESTER	获取价格	SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16
FAN5234MTCX	ONSEMI	获取价格	PWM/PFM 控制器，宽输入电压范围
FAN5234MTCX_NL	FAIRCHILD	获取价格	暂无描述
FAN5234QSC	FAIRCHILD	获取价格	Mobile-Friendly PWM/PFM Controller
FAN5234QSC	ROCHESTER	获取价格	SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PDSO16, QSOP-16
FAN5234QSCX	FAIRCHILD	获取价格	Mobile-Friendly PWM/PFM Controller

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