UNISONIC TECHNOLOGIES CO., LTD LD2127/A Preliminary LINEAR INTEGRATED CIRCUIT LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS DESCRIPTION 1 The UTC LD2127/A is a low dropout, 3-terminal positive voltage regulator designed to provide output current up to 800mA/1A, There are adjustable versions (VREF=1.0V) and various fixed versions. SOT-223 FEATURES * Low dropout voltage * Suitable for SCSI-2 active termination if VOUT set to 2.85V * Output current up to 0.8A for 2127 and 1.0A for 2127A * Built-in current limit and over temperature protection * Ultra low Adjustment Current (7μA typ.) * Ultra low minimum Load (0.3mA typ.) * Stable with low ESR ceramic output capacitor (MLCC) ORDERING INFORMATION Lead Free Ordering Number Halogen Free LD2127L-xx-AA3--R Note: Pin Assignment: I: VIN LD2127G-xx-AA3--R O: VOUT Package SOT-223 Pin Assignment A: AOI B: OAI C: AIO D: IAO Packing Tape Reel A: ADJ LD2127 1 L-xx-AA3- 2 - R (1)Packing Type (1) R: Tape Reel (2)Pin Assignment (2) refer to Pin Assignment (3)Package Type (3) AA3: SOT-223 (4)Output Voltage Code (4) xx: refer to Marking Information (5)Lead Free (5) L: Lead Free, G: Halogen Free (6)Current Code (6) Blank: 800mA, A: 1A www.unisonic.com.tw Copyright © 2013 Unisonic Technologies Co., Ltd 1 of 6 QW-R102-054.a LD2127/A Preliminary LINEAR INTEGRATED CIRCUIT MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING Current Code SOT-223 AD :ADJ Voltage Code 1 L: Lead Free G: Halogen Free Pin Code LD2127 XX 2 Date Code 3 BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R102-054.a LD2127/A Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA=25°C) PARAMETER SYMBOL RATINGS UNIT DC Input Voltage VIN 18 V Power Dissipation PD Internally limited W Junction Temperature TJ +150 °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. RECOMMENDED OPERATING RATINGS PARAMETER Input Voltage Operating Junction Temperature RATINGS 15 0 ~ +125 UNIT V °C SYMBOL θJA θJC RATINGS 165 15 UNIT °C/W °C/W THERMAL DATA PARAMETER Junction to Ambient Junction to Case SYMBOL VIN TJ ELECTRICAL CHARACTERISTICS (TA=25°C, refer to the test circuits, TJ=0 ~ 125°C, CO=10μF unless otherwise specified) For LD2127/A-ADJ PARAMETER Reference Voltage SYMBOL TEST CONDITIONS VREF VIN-VOUT=2V, IOUT=10mA, TJ=25°C VIN-VOUT=1.4~10V Reference Voltage VREF LD2127A : IOUT=10~1000mA Line Regulation ∆VOUT VIN-VOUT=1.5 ~ 13.75V, IOUT=10mA VIN-VOUT=3V Load Regulation ∆VOUT LD2127 : IOUT=10~800mA LD2127A : IOUT=10~1000mA Temperature stability ∆VOUT Long Term Stability ∆VOUT 1000 hrs, TJ=125°C Operating Input Voltage VIN Adjustment Pin Current IADJ VIN15V VIN-VOUT=1.4~10V, Adjustment Pin Current Change ∆IADJ LD2127A : IOUT=10 ~ 1000mA Minimum Load Current IO(MIN) VIN=15V LD2127 Current Limit ILIMIT VIN-VOUT=5V, TJ=25°C LD2127A Output Noise (%VO) eN B=10Hz ~ 10KHz, TJ=25°C IOUT=40mA, f=120Hz, TJ=25°C, Supply Voltage Rejection SVR VIN-VOUT=3V, VRIPPLE=1VPP IOUT=100mA IOUT=500mA Dropout Voltage VD IOUT=800mA IOUT=1A Thermal Regulation TA=25°C, 30ms Pulse Thermal Shutdown OTP UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 0.98 TYP 1.0 MAX 1.02 UNIT V 0.98 1.0 1.02 V 0.5 % 2.0 % 0.50 0.3 7 15 10 % % V μA 0.3 2 μA 0.3 1 mA 800 1000 mA 0.003 % 75 dB 1.05 1.15 1.18 1.22 0.01 150 1.15 1.25 1.28 1.35 0.10 V %/W °C 3 of 6 QW-R102-054.a LD2127/A Preliminary LINEAR INTEGRATED CIRCUIT APPLICATION NOTE of LD2127/A ADJUSTABLE The LD2127/A adjustable has a reference voltage of between the OUT and ADJ pins. IADJ is 7μA typ. (10μA max.) and IADJ is 0.3μA typ. (2µA max.). R1 is normally fixed to 1.2kΩ. From figure 1 we obtain: VOUT=VREF+R2(IADJ+IR1)=VREF + R2(IADJ+VREF/R1)=VREF(1+R2/R1) + R2 × IADJ. Usually R2 value is in the range of few KΩ, so the R2 X IADJ product could be neglected; then the above expression becomes: VOUT=VREF(1+R2/R1) For better load regulation, realize a good Kelvin connection of R1 and R2 is important. Particularly R1 connection must be realized very close to OUT and ADJ pin, while R2 ground connection must be placed as near as possible to the negative Load pin. Ripple rejection can be improved by introducing a 10μF electrolytic capacitor placed in parallel to the R2 resistor (See Fig. 2) The UTC LD2127/A also supports MLCC. See Fig.3 for adjustable output. UTC LD2127/A VIN IN + OUT ADJ 10µF VOUT + 10µF R1 1.2kΩ VREF R2 Fig.1 Adjustable Output Voltage Application Circuit Fig.2 Adjustable Output Voltage Application with improved Ripple Rejection. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R102-054.a LD2127/A Preliminary LINEAR INTEGRATED CIRCUIT APPLICATION NOTE of LD2127/A ADJUSTABLE(Cont.) UTC LD2127/A VIN IN 10µF VOUT OUT ADJ 10µF R1 1.2kΩ VREF R2 Fig.3 Adjustable Output Voltage Application Circuit for MLCC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R102-054.a LD2127/A Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS Power (W) 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-R102-054.a