UNISONIC TECHNOLOGIES CO., LTD LC1111 Advance LINEAR INTEGRATED CIRCUIT LOW DROPOUT LINEAR REGULATOR CONTROLLER DESCRIPTION 6 The UTC LC1111 is a low dropout linear regulator controller for applications requiring high-current and ultra low dropout voltages. The use of an external N-Channel MOSFET and provide an adjustable output by using an external resistive divider. An extremely accurate 0.8V (±2%) reference allows the implementation of sub 1 V voltage supplies. The reference is guaranteed over the complete supply and temperature ranges. The UTC LC1111 integrates various functions. For example, a Power-On-Reset (POR) circuit monitors VCC supply voltage to prevent wrong operations; the function of Under-Voltage Protection (UVP) protects the device from short circuit condition. The soft-start of output voltage is adjustable by the external capacitor on SS pin. Moreover, the UTC LC1111 can be enabled by other power system; namely, holding the EN above 1.6V enables output and pulling the EN under 0.4 disables output. 5 4 1 2 3 SOT-26 FEATURES * 4.5V~13.5V supply voltage range * 0.8V (±2%) voltage reference (temperature and process) * Power-On-Reset monitoring on VCC * Fast transient response * Programmable soft-start * Enable control function * Low shutdown current * Under-Voltage protection * Two versions of IC available: UVP activated after VOUT is ready ORDERING INFORMATION Ordering Number LC1111G-AG6-R www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd Package SOT-26 Packing Tape Reel 1 of 7 QW-R102-072.a LC1111 Advance MARKING PIN CONFIGURATION PIN DESCRIPTION PIN NO. PIN NAME 1 EN 2 GND 3 FB 4 5 SS DRV 6 VCC LINEAR INTEGRATED CIRCUIT DESCRIPTION Enable control pin. Pulling the EN high (VEN>1.6) enables the VOUT; forcing the EN low (VEN<0.4V disables the VOUT. When re-enabled, the IC undergoes a new soft-start process. The EN pin is pulled high internally, hence it can be left open if the EN control is not used. Ground pin of the circuitry. All voltage levels are measured with respect to this pin. Voltage Feedback Pin. Connecting this pin to an external resistor divider receives the feedback voltage of the regulator. Connect this pin to a capacitor for soft-start. This pin drives the gate of an external N-channel MOSFET for linear regulator. Power input pin of the device. The voltage at this pin is monitored for Power-On-Reset purpose. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 7 QW-R102-072.a LC1111 Advance LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM Power-On Reset VCC Enable_EA Internal Regulator POR VP VP + + - 0.8V Error Amplifier 5µA EN + Enable - DRV Control Logic 0.8V FB - VP UV 4.5µA SS UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw + UVP Comparator 70%VREF GND 3 of 7 QW-R102-072.a LC1111 Advance LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT VCC Input Voltage (VCC to GND) VCC -0.3~16 V EN, SS, to GND Voltage -0.3~7 V FB to GND Voltage VFB -0.3~7 V DRV to GND Voltage VDRV -0.3~VCC+0.3 V Junction Temperature TJ 150 °C Storage Temperature TSTG -65~150 °C Maximum Lead Soldering Temperature, 10 Seconds TSDR 260 °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. THERMAL CHARACTERISTIC PARAMETER Junction-to-Ambient Resistance in Free Air (Note 1) SYMBOL θJA TYPICAL VALUE 250 UNIT °C/W RECOMMENDED OPERATING CONDITIONS (Note 2) PARAMETER SYMBOL RATINGS UNIT VCC Input Voltage (VCC to GND) VCC 4.5~13.5 V EN to GND Voltage VEN 0~5.5 V VOUT Output Voltage (Note 3) VOUT 0.8~VIN-VDROP V Ambient Temperature TA -40~85 °C Junction Temperature TJ -40~125 °C Notes: 1. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. 2. Refer to the typical application circuit. 3. VDROP defined as the VIN -VOUT voltage at VOUT=98% normal VOUT. The linear regulator must provide the output MOSFET with sufficient Gate-to-Source voltage (VGS=VCC-VOUT) to regulate the output voltage. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 7 QW-R102-072.a LC1111 Advance LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over VCC=5/12V, TA=-40~85°C. Typical values are at TA=25°C. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX SUPPLY CURRENT VCC=12V 0.8 1.0 VCC Supply Current ICC VCC=5V 0.8 1.0 VCC=12V, EN=GND 5 VCC Shutdown Current ISD VCC=5V, EN=GND 5 POWER-ON-RESET (POR) VCC POR Threshold VCC Risig 3.8 4.0 4.2 VCC POR Hysteresis 0.4 REFERENCE VOLTAGE Reference Voltage VREF VCC=12V, TA=25°C 0.8 Reference Voltage Accuracy VCC=12V -1 1 Line Regulation VCC=4.5V~13.2V -1.5 1.5 FB Input Current -100 100 ERROR AMPLIFIER Unity Gain Bandwidth VCC=5/12V 2 Open Loop DC Gain VCC=12V, No Load 60 80 Power Supply Rejection Ratio PSRR VCC=12V, 100Hz, No Load 50 VCC=12V, IDRV (SOURCE)=5mA, VFB=0.6V 11.2 11.5 DRV High Voltage VDRV (high) VCC=5V, IDRV (SOURCE)=5mA, VFB=0.6V 4.7 VCC=12V, IDRV (SINK)=5mA, VFB=1V 0.5 1 DRV Low Voltage VDRV (low) VCC=5V, IDRV (SINK)=5mA, VFB=1V 0.8 VCC=12V, VDRV=6V, VFB=0.6V 50 DRV Source Current IDRV (source) VCC=5V, VDRV=2.5V, VFB=0.6V 10 VCC=12V, VDRV=6V, VFB=1V 40 DRV Sink Current IDRV (sink) VCC=5V, VDRV=2.5V, VFB=1V 10 ENABLE EN Logic High Threshold VEN (TH) VEN Rising 0.55 0.8 1.05 Voltage EN Hysteresis 50 EN Shutdown Debounce VEN Falling 2 EN Internal Pull High Current 5 SOFT-START SS Current ISS 4.5 UNDER-VOLTAGE PROTECTION (UVP) Under-Voltage Threshold VUV (TH) VEN=5V, VFB Falling 68 75 82 UVP Debounce Interval 5 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw UNIT mA mA µA µA V V V % % nA MHz dB dB V V V V mA mA mA mA V mV µs µA µA % µs 5 of 7 QW-R102-072.a LC1111 Advance LINEAR INTEGRATED CIRCUIT FUNCTION DESCRIPTION Power-On-Reset (POR) The UTC LC1111 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. Typical POR threshold is 4.0V with 0.4V hysteresis. Soft-Start The UTC LC1111 provides an adjustable soft-start circuitry to control rise rate of the output voltage and limit the current surge during start-up. The soft-start time is set with a capacitor from the SS pin to the ground. The capacitor is charged to VP with a constant 4.5mA (typ.) current source. Under-Voltage Protection (UVP) The UTC LC1111 monitors the voltage on FB. When the voltage on FB falls below the under-voltage threshold, the UVP circuit shuts off the output voltage immediately by pulling down DRV to 0V and latches UTC LC1111off, requiring either a VCC POR or EN re-enable again to restart. The UTC LC1111 UVP is activated after VOUT voltage has reached 90% POK threshold while the UTC LC1111 UVP is activated after VCC has been applied to VCC pin. Enable Control The UTC LC1111 has a dedicated enable pin (EN). A logic low signal applied to this pin shuts down the output. Following a shutdown, a logic high signal re-enables the output through initiation of a new soft-start cycle. It’s not necessary to use an external transistor to save cost. Power-OK and Delay The UTC LC1111 indicates the status of the output voltage by monitoring the feedback voltage (VFB) on FB pin. As the VFB rises and reaches the rising Power-OK voltage threshold (VPOKTH), an internal delay function starts to work. At the end of the delay time, the IC turns off the internal NMOS of the POK to indicate that the output is ok. As the VFB falls and reaches the falling Power-OK voltage threshold, the IC turns on the NMOS of the POK (after a debounce time of 5ms typical). Output Voltage Regulation The UTC LC1111 is a linear regulator controller. An external N-channel MOSFET should be connected to DRV as the pass element. The output voltage set by the resistor divider is determined by: R1 VOUT = 0.8 •（1+ ) R2 Where R1 is connected from VOUT to FB and R2 is connected from FB to GND. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 7 QW-R102-072.a LC1111 Advance LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT VCC 5V or 12V CCC 1µF SS VCC DRV CSS 10nF ON OFF CIN 47µF R3 Optional C1 Optional UTC LC1111 EN VIN 1.5V R1 10kΩ FB EN GND VOUT 1.2V/3A COUT 100µF R2 20kΩ 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 7 of 7 QW-R102-072.a