Dual Mobile-Friendly PWM/PFM Controller FAN5234 Description The FAN5234 PWM controller provides high efficiency and www.onsemi.com regulation with an adjustable output from 0.9 V to 5.5 V 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 further enhanced by using the TSSOP16 MOSFETs R as a currentsense component. DS(ON) CASE 948AH Feedforward ramp modulation, average current mode control, and internal feedback compensation provide fast response to load MARKING DIAGRAM transients. The FAN5234 monitors these outputs and generates a PGOOD (power good) signal when the softstart is completed and the output is within 10% of its set point. A builtin overvoltage protection prevents the output voltage from going above 120% of the Y&Z&2&K set point. Normal operation is automatically restored when the 5234MTCX overvoltage conditions cease. Undervoltage protection latches the chip off when the output drops below 75% of its set value after the soft start sequence is completed. An adjustable overcurrent function monitors the output current by sensing the voltage drop across the lower MOSFET. Y = ON Semiconductor Logo Features &Z = Assembly Plant Code &2 = Numeric Date Code Wide Input Voltage Range for Mobile Systems: 2 V to 24 V &K = Lot Code Excellent Dynamic Response with Voltage FeedForward and 5234MTCX = Specific Device Code AverageCurrentMode Control Lossless Current Sensing on LowSide MOSFET or Precision OverCurrent via Sense Resistor ORDERING INFORMATION V UnderVoltage Lockout CC Device Package Shipping PowerGood Signal FAN5234MTCX TSSOP 16 2500 / LightLoad Hysteretic Mode Maximizes Efficiency (PbFree) Tape & Reel 300 kHz or 600 kHz Operation For information on tape and reel specifications, Operating Temperature Range: 10C to +85C including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification TSSOP16 Package Brochure, BRD8011/D. This is a PbFree Device Applications Mobile PC Regulator Handheld PC Power Related Resources Application Note AN6002 Component Calculations and Simulation Tools for FAN5234 or FAN5236 Application Note AN1029 Maximum Power Enhancement Techniques for SO8 Power MOSFET Semiconductor Components Industries, LLC, 2004 1 Publication Order Number: June, 2021 Rev. 3 FAN5234/DFAN5234 TYPICAL APPLICATION VIN(BATTERY) = 2 to 24 V VIN C1 C2 1 D1 VCC BOOT +5 11 15 +5 C4 Q1A C5 HDRV 14 R5 L1 ILIM 1.8 V at 3.5 A SW 4 13 C6 EN Q1B 3 R1 FAN5234 R3 LDRV SS1 10 7 C3 PGND +5 9 FPWM 16 ISNS R2 12 AGND R4 8 VSEN 6 PGOOD 2 VOUT 5 Figure 1. 1.18 V Output Regulator BLOCK DIAGRAM 5 V C BOOT BOOT V DD EN V IN POR/UVLO Q1 FPWM FPWM HDRV HYST SS + V OUT HYST SW OVP + ADAPTIVE L OUT Q2 GATE V DD C OUT CONTROL LDRV RAMP LOGIC OSC VIN CLK PGND Q PWM S/H S R PWM/HYST PWM RAMP + R SENSE I det. MODE LIM ISNS CURRENT VSEN EA DUTY PROCESSING I CYCLE S OUT + CLAMP I LIM SS V REF R ILIM Reference and PGOOD PWM/HYST SoftStart REF2 Figure 2. Block Diagram www.onsemi.com 2