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UNISONIC TECHNOLOGIES CO., LTD LC1111 Advance LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 7 Copyright © 2015 Unisonic Technologies Co., Ltd QW-R102-072.a LOW DROPOUT LINEAR REGULATOR CONTROLLER  DESCRIPTION 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 volt age 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 V CC supply voltage to prevent wrong operations; the function of Under-Voltage Protection (UVP) protects the devic e 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.  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 SOT-26  ORDERING INFORMATION Ordering Number Package Packing LC1111G-AG6-R SOT-26 Tape Reel

LC1111 Advance LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 7 www.unisonic.com.tw Q W - R 1 0 2 - 0 7 2 . a  MARKING  PIN CONFIGURATION  PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION 1 EN 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. 2 GND Ground pin of the circuitry. All voltage levels are measured with respect to this pin. 3 FB Voltage Feedback Pin. Connecting this pin to an external resistor divider receives the feedback voltage of the regulator. 4 SS Connect this pin to a capacitor for soft-start. 5 DRV This pin drives the gate of an extern al N-channel MOSFET for linear regulator. 6 V CC Power input pin of the device. The voltage at this pin is monitored for Power-On-Reset purpose.

LC1111 Advance LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 7 www.unisonic.com.tw Q W - R 1 0 2 - 0 7 2 . a  BLOCK DIAGRAM VCC EN SS Power-On Reset Internal Regulator POR VPVP 5µA Enable+ 0.8V VP 4.5µA Control Logic UV Enable_EA DRV FB GND 0.8V Error Amplifier + 70%VREF UVP Comparator

LC1111 Advance LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 7 www.unisonic.com.tw Q W - R 1 0 2 - 0 7 2 . a  ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT VCC Input Voltage (VCC to GND) V CC -0.3~16 V EN, SS, to GND Voltage -0.3~7 V FB to GND Voltage V FB -0.3~7 V DRV to GND Voltage V DRV -0.3~V CC+0.3 V Junction Temperature T J 150 °C Storage Temperature T STG -65~150 °C Maximum Lead Soldering Temperature, 10 Seconds T SDR 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 SYMBOL TYPICAL VALUE UNIT Junction-to-Ambient Resistance in Free Air (Note 1) θJA 250 °C/W  RECOMMENDED OPERATING CONDITIONS (Note 2) PARAMETER SYMBOL RATINGS UNIT VCC Input Voltage (VCC to GND) V CC 4.5~13.5 V EN to GND Voltage V EN 0~5.5 V VOUT Output Voltage (Note 3) V OUT 0.8~V IN-VDROP V Ambient Temperature T A -40~85 °C Junction Temperature T J -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. V DROP 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.

LC1111 Advance LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 7 www.unisonic.com.tw Q W - R 1 0 2 - 0 7 2 . a  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 UNIT SUPPLY CURRENT VCC=12V 0.8 1.0 mA VCC Supply Current I CC VCC=5V 0.8 1.0 mA VCC=12V, EN=GND 5 µA VCC Shutdown Current I SD VCC=5V, EN=GND 5 µA POWER-ON-RESET (POR) VCC POR Threshold V CC Risig 3.8 4.0 4.2 V VCC POR Hysteresis 0.4 V REFERENCE VOLTAGE Reference Voltage V REF V CC=12V, TA=25°C 0.8 V Reference Voltage Accuracy V CC=12V -1 1 % Line Regulation V CC=4.5V~13.2V -1.5 1.5 % FB Input Current -100 100 nA ERROR AMPLIFIER Unity Gain Bandwidth V CC=5/12V 2 MHz Open Loop DC Gain V CC=12V, No Load 60 80 dB Power Supply Rejection Ratio PSRR V CC=12V, 100Hz, No Load 50 dB VCC=12V, IDRV (SINK)=5mA, VFB=1V 0.5 1 V DRV Low Voltage V DRV (low) VCC=5V, IDRV (SINK)=5mA, VFB=1V 0.8 V VCC=12V, VDRV=6V, VFB=0.6V 50 mA DRV Source Current I DRV (source) VCC=5V, VDRV=2.5V, VFB=0.6V 10 mA VCC=12V, VDRV=6V, VFB=1V 40 mA DRV Sink Current I DRV (sink) VCC=5V, VDRV=2.5V, VFB=1V 10 mA ENABLE EN Logic High Threshold Voltage VEN (TH) V EN Rising 0.55 0.8 1.05 V EN Hysteresis 50 mV EN Shutdown Debounce V EN Falling 2 µs EN Internal Pull High Current 5 µA SOFT-START SS Current I SS 4.5 µA UNDER-VOLTAGE PROTECTION (UVP) Under-Voltage Threshold V UV (TH) V EN=5V, VFB Falling 68 75 82 % UVP Debounce Interval 5 µs

LC1111 Advance LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 7 www.unisonic.com.tw Q W - R 1 0 2 - 0 7 2 . a  FUNCTION DESCRIPTION Power-On-Reset (POR) The UTC LC1111 monitors the V CC pin voltage (V CC) 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 V CC POR or EN re-enable again to restart. The UTC LC1111 UVP is activated after V OUT 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 si gnal 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 volt age by monitoring the feedback voltage (V FB) on FB pin. As the V FB rises and reaches the rising Power-OK voltage threshold (V POKTH), an internal delay function starts to work. At the end of the delay time, the IC turns off the inter nal NMOS of the POK to indicate that the output is ok. As the VFB falls and reaches the falling Power-OK voltage thres hold, 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 controlle r. An external N-channel MO SFET should be connected to DRV as the pass element. The output voltage set by the resistor divider is determined by: )2R 1R+1•8.0=VOUT （ Where R1 is connected from VOUT to FB and R2 is connected from FB to GND.

LC1111 Advance LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 7 of 7 www.unisonic.com.tw Q W - R 1 0 2 - 0 7 2 . a  TYPICAL APPLICATION CIRCUIT EN SS VCC DRV FB GND CSS 10nF ON EN OFF CCC 1µF VCC 5V or 12V VIN 1.5V COUT 100µF VOUT 1.2V/3AC1 10kΩ 20kΩ UTC LC1111 CIN 47µF Optional Optional 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.