UNISONIC TECHNOLOGIES CO., LTD LC1126 Preliminary LINEAR INTEGRATED CIRCUIT ULTRA LOW OUTPUT VOLTAGE LINEAR N-FET CONTROLLER 5 6 DESCRIPTION The UTC LC1126 is an ultra low output voltage linear N-FET controller designed to provide well supply voltage for front-side-bus termination on motherboards and NB applications. The UTC LC1126 integrates many functions. A Power-On-Reset (POR) circuit monitors supply voltages to prevent wrong operations. A POK indicates the output status with time delay which is set internally. It can control other converter for power sequence. It can available for SC-59-6 package. The UTC LC1126 can be enabled by other power system. A 0.5V reference voltage with 2% accuracy providing tight regulation of the output voltage, enable control, open drain power good signal, under-voltage protection and soft start. 4 1 2 3 SOT-26 FEATURES * MLCC and POSCAP Stable * 0.5V±2% Reference Voltage * Internal soft-start * Enable control * Fast transient response * Under-Voltage short circuit protection * Power OK output with a delay time * Adjustable output voltage down to 0.5V * Drive N-Channel MOSFETs ORDERING INFORMATION Ordering Number Lead Free Halogen Free LC1126L-AG6-R LC1126G-AG6-R Package Packing SOT-26 Tape Reel LC1126L-AG6-R (1)Packing Type (1) R: Tape Reel (2)Package Type (2) AG6: SOT-26 (3)Halogen Free (3) L: Lead Free, G: Halogen Free www.unisonic.com.tw Copyright © 2013 Unisonic Technologies Co., Ltd 1 of 6 QW-R102-050.a LC1126 Preliminary MARKING INFORMATION PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 PIN NAME VCC GND POK EN FB DRV LINEAR INTEGRATED CIRCUIT DESCRIPTION Input Voltage Ground Power ok Output Pin H: Normal Operation, L: Shutdown Feedback Pin Gate Drive to N-FET UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R102-050.a LC1126 Preliminary LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM DRV VCC EN Power-ON Reset Enable Thermal Shutdown Error Amp Soft-Start And Control Logic + UV - Vref=0.5V FB 0.25V + GND 92% VREF UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw + Delay - POK POK 3 of 6 QW-R102-050.a LC1126 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC -0.3~7 V DRV to GND -0.3~VCC+0.3 V Power Dissipation PD 0.4 W Junction Temperature TJ -40~+125 °C Operating Temperature TOPR -40~+85 °C Storage Temperature TSTG -65~+150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS (VIN=1.5V, VSHDN=VIN, TA=25°C, CIN=COUT=1µF, unless otherwise noted.) PARAMETER SYMBOL TEST CONDITIONS Supply Voltage Range VCC Input Voltage UVLO Threshold VUVLO VCC Rising Input Voltage UVLO Hysteresis VHYST VCC Falling Supply Current ICC EN=VCC Shutdown Current ISD EN=0V Feedback Voltage VFB Feedback Pin Input Current IFB VFB=0.5V Soft Start Time TSS Enable VENH EN Pin Logic High Threshold Voltage VENL Disable EN Pin Input Current IEN IOUT=0mA, VIN=5V Output Voltage UVLO Threshold VTH(UV) VFB Falling Ton Duty TON VFB<0.25V IDRV(SRC) Sourcing, VFB=0.48V DRV Output Current IDRV(SINK) Sinking, VFB=0.52V DRV Pin Output Voltage VDRV VFB=0.48V, VCC=5V, No Load POK Threshold Voltage for Power OK VPOK VFB Rising POK Threshold Voltage for Power Not OK VPNOK VFB Falling POK Low Voltage POK Sinks 1mA POK Delay Time TDELAY Thermal Shutdown Temperature TSD Thermal Shutdown Hysteresis UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 4.5 TYP 3.75 0.25 0.4 -1 0.49 -100 0.5 1 1.3 -1 0.2 4.9 90% 82% 0.8 0.25 30 20 20 93% 85% 50 2 150 50 MAX UNIT 5.5 V V V 0.8 mA 1 µA 0.51 V 100 nA ms V 0.5 V +1 µA 0.3 V % mA mA 5.0 V 96% VFB 88% VFB 100 mV 10 ms °C °C 4 of 6 QW-R102-050.a LC1126 Preliminary LINEAR INTEGRATED CIRCUIT FUNCTION DESCRIPTIONS Power-On-Reset A Power-On-Reset (POR) circuit monitors the VCC pin voltage (VCC) for power-on-reset function to prevent wrong operation. The built-in POR circuit keeps the output shutting off until internal circuit is operating properly.. Internal Soft-Start An internal soft-start provides an internal soft-start circuitry to control rise rate of the output voltage and limit the current surge during start-up. The typical soft-start interval is about 1ms. Output Voltage Regulation An error amplifier working with a temperature compensated 0.5V reference and an output NMOS regulates output to the preset voltage. The error amplifier designed with high bandwidth and DC gain provides very fast transient response and less load regulation. Under-Voltage Protection (UVP) UTC LC1126 monitors the voltage on FB pin after soft-start process is finished. Therefore the UVP is disabling during soft-start. When the voltage on FB pin falls below the under-voltage threshold, the UVP circuit shuts off the output immediately. After a while (~70% Duty), UTC LC1126 starts a new soft-start to regulate output. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of UTC LC1126. When the junction temperature exceeds +150°C, a thermal sensor turns off the output NMOS, allowing the device to cool down. The regulator regulates the output again through initiation of new soft-start cycle after the junction temperature cools by 50°C, resulting in a pulsed output during continuous thermal overload conditions. TYPICAL APPLICATION CIRCUIT VIN=1.5V C1 VCC=5V 4.7µF U1 1 C3 2 0.1µF 3 VCC GND POK DRV FB EN Q1 MOSFET N 6 5 C4 56pF 4 R1 43K C2 UTC LC1126 VOUT=0.5V* (1+ VOUT=1.05V R2 39K 10µF R1 ) R2 10K UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R102-050.a LC1126 Preliminary LINEAR INTEGRATED CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R102-050.a