FAN5234QSCX

FAN5234QSCX Datasheet

FAN5234

Part	Datasheet
FAN5234QSCX	FAN5234QSCX (pdf)

Related Parts	Information
FAN5234MTC	FAN5234MTC
FAN5234QSC	FAN5234QSC

PDF Datasheet Preview
FAN5234 Mobile-Friendly PWM/PFM Controller • 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 • QSOP16, TSSOP16 • 300Khz or 600Khz operation • Mobile PC regulator • Hand-Held PC power The FAN5234 PWM controller provides high 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 and hysteretic operation at light loads contribute to a high over a wide range of loads. The hysteretic mode of operation can be disabled if PWM mode is desired for all load levels. 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 overvoltage 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. VIN BATTERY = 2 to 24V VCC 11 ILIM 4 C3 +5 EN 3 SS1 7 FPWM 16 AGND 8 PGOOD 2 VIN 1 FAN5234 15 BOOT Q1A 14 HDRV 13 SW Q1B 10 LDRV 9 PGND 12 ISNS 6 VSEN 5 VOUT D1 +5 L1 R3 3.5A C6 R1 Figure 1.8V Output Regulator see Table 2, page 12 for BOM FAN5234 VIN PGOOD EN ILIM VOUT VSEN SS AGND FAN5234 FPWM BOOT HDRV SW ISNS VCC LDRV PGND QSOP-16 or TSSOP-16 = 112°C/W PRODUCT SPECIFICATION Pin Number Pin Name PGOOD ILIM VOUT VSEN AGND PGND LDRV Ordering Information Part Number FAN5234QSC FAN5234QSCX FAN5234MTC FAN5234MTCX Temperature Range -10°C to 85°C -10°C to 85°C -10°C to 85°C -10°C to 85°C Package QSOP-16 QSOP-16 TSSOP-16 TSSOP-16 FAN5234 Packing Rails Tape and Reel Rails Tape and Reel DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 5/3/04 0.0m 004 Stock#DS30005234 2004 Fairchild Semiconductor Corporation

PDF Datasheet Preview

FAN5234

Mobile-Friendly PWM/PFM Controller
• 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
• QSOP16, TSSOP16
• 300Khz or 600Khz operation
• Mobile PC regulator
• Hand-Held PC power

The FAN5234 PWM controller provides high 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 and hysteretic operation at light loads contribute to a high over a wide range of loads. The hysteretic mode of operation can be disabled if PWM mode is desired for all load levels. 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 overvoltage 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.

VIN BATTERY = 2 to 24V

VCC 11

ILIM 4

C3 +5

EN 3 SS1 7

FPWM 16 AGND 8 PGOOD 2

VIN 1

FAN5234
15 BOOT

Q1A 14 HDRV 13 SW

Q1B 10 LDRV
9 PGND 12 ISNS 6 VSEN 5 VOUT

D1 +5

L1 R3
3.5A

C6 R1

Figure 1.8V Output Regulator see Table 2, page 12 for BOM

FAN5234

VIN PGOOD

EN ILIM VOUT VSEN

SS AGND

FAN5234

FPWM BOOT HDRV SW ISNS VCC LDRV PGND

QSOP-16 or TSSOP-16 = 112°C/W

PRODUCT SPECIFICATION

Pin Number Pin Name

PGOOD

ILIM

VOUT

VSEN

AGND

PGND

LDRV
Ordering Information

Part Number FAN5234QSC FAN5234QSCX FAN5234MTC FAN5234MTCX

Temperature Range -10°C to 85°C -10°C to 85°C -10°C to 85°C -10°C to 85°C

Package QSOP-16 QSOP-16 TSSOP-16 TSSOP-16

FAN5234

Packing Rails

Tape and Reel Rails

Tape and Reel

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
5/3/04 0.0m 004 Stock#DS30005234 2004 Fairchild Semiconductor Corporation

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived FAN5234QSCX Datasheet file may be downloaded here without warranties.

Datasheet ID: FAN5234QSCX 513927