Fairchild FAN5069 User's Manual
Summary
The FAN5069 is a powerful power management IC providing combined LDO and high-efficiency PWM regulation in one chip, accepting inputs from 3V to 24V. It is engineered for mission-critical applications such as PC/Server motherboards, embedded systems, FPGAs, DSPs, and industrial power supplies requiring stable voltage delivery. This technical guide provides comprehensive documentation on utilizing the device, covering advanced features like soft-start, synchronous rectification, and multi-fault protection. Detailed pin assignments, operating modes, and typical application diagrams are included to ensure reliable integration into high-power DC-to-DC converter designs.
Page 1 Text Content
FA 5069 PW and LD ontroller C om bo
September 2006
FAN5069 PWM and LDO Controller Combo Features Description General Purpose PWM Regulator and LDO Controller The FAN5069 combines a high-efficiency Pulse-Width-
Input Voltage Range: 3V to 24V Modulated (PWM) controller and an LDO (Low Drop Out) linear regulator controller. Synchronous rectification pro-
Output Voltage Range: 0.8V to 15V
vides high efficiency over a wide range of load currents.
– VCC
Efficiency is further enhanced by using the low-side
MOSFET’s RDS(ON) to sense current.
Shunt Regulator for 12V Operation
Both the linear and PWM regulator soft-start are con-
Support for Ceramic Cap on PWM Output
trolled by a single external capacitor, to limit in-rush cur-
Programmable Current Limit for PWM Output
rent from the supply when the regulators are first
Programmable Switching Frequency (200KHz to
enabled. Current limit for PWM is also programmable.
600KHz)
The PWM regulator employs a summing-current-mode
RDS(ON) Current Sensing
control with external compensation to achieve fast load
Internal Synchronous Boot Diode
transient response and provide design optimization.
Soft-Start for both PWM and LDO
Multi-Fault Protection with Optional Auto-restart FAN5069 is offered in both industrial temperature grade (-40°C to +85°C) as well as commercial temperature
16-pin TSSOP Package
grade (-10°C to +85°C).
Applications PC/Server Motherboard Peripherals – VCC_MCH (1.5V), VDDQ (1.5V) and VTT_GTL (1.25V) Power Supply for – FPGA, DSP, Embedded Controllers, Graphic Card Processor, and Communication Processors Industrial Power Supplies High-Power DC-to-DC Converters
Ordering Information Part Number Operating Temp. Range Pb-Free Package Packing Method Qty./Reel FAN5069MTCX -10°C to +85°C Yes 16-Lead TSSOP Tape and Reel FAN5069EMTCX -40°C to +85°C Yes 16-Lead TSSOP Tape and Reel
Note: Contact Fairchild sales for availability of other package options.
© 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5069 Rev. 1.1.5
Page Summary Contents For Fairchild FAN5069 User's Manual
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 22 |
| File Size | 622.42 KB |
| Published | May 20, 2026 |
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Frequently Asked Questions
What is the operating junction temperature range for this controller?
The device is available in industrial (-40°C to +85°C) and commercial (-10°C to +85°C) temperature grades.
How can I adjust the switching frequency of the PWM regulator?
Place a resistor (RT) from Pin 2 (R(T)) to GND; this increases the nominal 200kHz switching frequency.
Does the device have protection features when power is restored?
It includes soft-start for both PWM and LDO, which also sets the delay after restarting following a fault condition.
What voltage inputs can I provide to the regulator combo?
The linear regulator accepts an input voltage range from 3V to 24V.