UNISONIC TECHNOLOGIES CO., LTD LR9273 Preliminary CMOS IC SUPER LOW ON RESISTANCE/LOW VOLTAGE 1A LDO REGULATOR DESCRIPTION The UTC LR9273 is a typical LDO (linear regulator) with features of super low dropout, 1A output current capability, and -3mV typical load regulation at 1A. During operation of the UTC LR9273, the dropout voltage is very low and the response of line transient and load transient are very well. Internally, there’re many functions of UTC LR9273 which can be seen in the block figure. There are a voltage reference unit, an error amplifier, resistor-net for voltage setting, a current limit circuit, and a chip enable circuit in each UTC LR9273. The UTC LR9273 can be used as an ideal of the power supply for hand-held communication equipment, such as: power source for portable communication equipment, power source for electrical appliances, for example, cameras, VCRs and camcorders and power source for battery-powered equipment. SOP-8 1 SOT-89-5 FEATURES * Ultra Supply Current: * Standby Mode: * Very Low Dropout Voltage: * Ripple Rejection: 60µA (Typ.) 0.1µA (Typ.) 0.18V (Typ.) @IOUT =1A, VOUT =2.85V 70dB (Typ.) @f=1kHz,VOUT=2.85V ±100ppm/°C (Typ.) * Temperature-Drift Coefficient of Output Voltage: * Well Line Regulation: 0.02%/ V (Typ.) * Output Voltage Accuracy: ±1.5% (Typ.) * Internal Fold Back Protection 250mA (Typ.) @ short mode Circuit: * CIN=COUT=4.7µF or more (Ceramic capacitors) are recommended to be used with this IC www.unisonic.com.tw Copyright © 2013 Unisonic Technologies Co., Ltd 1 of 9 QW-R502-A30.a LR9273 Preliminary CMOS IC ORDERING INFORMATION Ordering Number Package Lead Free Halogen Free LR9273xL-xx-S08-T LR9273xG-xx-S08-T SOP-8 LR9273xL-xx-S08-R LR9273xG-xx-S08-R SOP-8 LR9273xL-xx-AB5-R LR9273xG-xx-AB5-R SOT-89-5 Notes: 1. x: The auto discharge function at off state are options as follows. 2. xx: Output Voltage, refer to Marking Information. Packing Tube Tape Reel Tape Reel MARKING INFORMATION PACKAGE VOLTAGE CODE 5 MARKING 4 XX Date Code SOT-89-5 Active Code 28 :2.8V 35 :3.5V AD: ADJ LR9273 1 2 Voltage Code L: Lead Free G: Halogen Free 3 SOP-8 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 9 QW-R502-A30.a LR9273 Preliminary PIN CONFIGURATION PIN DESCRIPTION SOT-89-5 PIN NO. 1 2 3 4 5 PIN NAME ADJ NC GND CE VIN VOUT CMOS IC DESCRIPTION ADJUST Pin (For Adjustable Version) No Connection (For Fixed Version) Ground Pin Chip Enable Pin. Active when this Pin is high. Input Pin Output Pin HSOP-8J PIN NO. PIN NAME 1 VOUT Output Pin 2 ON/OFF ON/OFF Pin 3, 5, 6, 7 NC No connection (Note) 4 VSS GND Pin 8 VIN Input Pin Note: The NC pin is electrically open. The NC pin can be connected to VIN or VSS. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw DESCRIPTION 3 of 9 QW-R502-A30.a LR9273 Preliminary CMOS IC BLOCK DIAGRAM For Fixed Version For Adjustable Version UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 9 QW-R502-A30.a LR9273 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Input Voltage VIN 6.5 V Input Voltage (CE Pin) VCE -0.3~6.5 V Output Voltage VOUT -0.3~ VIN+0.3 V Power Dissipation PD 900 mW Operating Temperature TOPT -40~+85 °С Storage Temperature TSTG -55~+125 °С 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 LR9273B/D-xx (Fixed Output Voltage Type) PARAMETER SYMBOL TEST CONDITIONS Input Voltage VIN Supply Current ISS VIN−VOUT=1.0V, VCE=VIN, IOUT=0A Standby Current Istandby VIN=6.0V, VCE=0V VOUT>1.5V VIN−VOUT=1.0V, Output Voltage VOUT IOUT=100mA VOUT≤1.5V VIN−VOUT=0.3V, 1mA≤IOUT≤300mA, If ∆VOUT VOUT≤1.1V, then VIN=1.4V Load Regulation ∆IOUT VIN−VOUT=0.3V, 1mA≤IOUT≤1A, If VOUT≤1.1V, then VIN=1.7V 0.8≤VOUT<0.9 0.9≤VOUT<1.0 I OUT=300mA 1.0≤VOUT<1.5 1.5≤VOUT<2.6 Dropout Voltage 2.6≤VOU VDIF (TOPT=25°C) 0.8≤VOUT<0.9 0.9≤VOUT<1.0 IOUT=1A 1.0≤VOUT<1.5 1.5≤VOUT<2.6 2.6≤VOU ∆VOUT IOUT=100mA, VOUT+0.5V≤VIN ≤6.0V, Line Regulation ∆VIN If VOUT≤0.9V, 1.4V≤VIN≤6.0V Ripple Rejection RR Output Voltage Temperature Coefficient ∆VOUT ∆TOPT Output Current Short Current Limit Pull-Down Resistance for CE PIn High CE Input Voltage Low Thermal Shutdown Detector Threshold Temperature Thermal Shutdown Released Temperature Output Noise ILIM ISC MIN 1.4 60 0.1 ×0.98 -30 -15 -2 MAX UNIT 6.0 V 100 µA 1.0 µA ×1.02 V +30 mV 15 -3 f=1kHz (VOUT≤4.0V) f=1kHz (VOUT>4.0V) Ripple 0.5Vp-p,VIN−VOUT=1.0V, IOUT=100mA, If VOUT≤1.2V, VIN−VOUT=1.5V, IOUT=100mA IOUT=100mA, -40°С≤TOPT≤85°С VIN-VOUT=1.0V VOUT=0V TYP mV 0.33 0.22 0.18 0.10 0.05 0.72 0.64 0.56 0.32 0.18 0.57 0.47 0.32 0.15 0.10 V V V V V V V V V V 0.05 0.20 %/V 70 dB 60 dB ±100 ppm/°С 250 A mA 1 RPD 1.9 VCEH VCEL 1.0 0 mV 5.0 15.0 MΩ 6.0 0.4 V V TTSD Junction temperature 150 °С TTSR Junction temperature 120 °С BW=10Hz~100kHz 30 µVrms en UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 9 QW-R502-A30.a LR9273 Preliminary CMOS IC ELECTRICAL CHARACTERISTICS LR9273B/D-xx (Adjustable Output Voltage Type) PARAMETER SYMBOL TEST CONDITIONS Input Voltage VIN Supply Current ISS VOUT=VADJ, VIN=2.0, VCE=VIN Standby Current Istandby VIN=6.0V, VCE=0V Reference Voltage for VOUT VOUT=VADJ, VIN=2.0V, IOUT=100mA Adjustable Voltage Regulator Output Voltage Range RVOUT ∆VOUT VIN=1.4V, 1mA≤IOUT≤300mA Load Regulation ∆IOUT VIN=1.7V, 1mA≤IOUT≤1A Dropout Voltage VDIF Line Regulation ∆VOUT ∆VIN Ripple Rejection RR Output Voltage Temperature Coefficient ∆VOUT ∆TOPT Output Current Short Current Limit Pull-Down Resistance for CE PIn High CE Input Voltage Low Thermal Shutdown Detector Threshold Temperature Thermal Shutdown Released Temperature Output Noise ILIM ISC VOUT=VADJ MIN 1.4 60 0.1 0.970 1.0 -15 MAX 6.0 100 1.0 1.000 1.030 -2 VIN 15 -3 IOUT=300mA IOUT=1A VOUT=VADJ, IOUT=100mA, 1.5V≤VIN ≤6.0V f=1kHz Ripple 0.5Vp-p, VOUT=VADJ, VIN=2.5V, IOUT=100mA IOUT=100mA, -40°С≤TOPT≤85°С VOUT=VADJ, VIN=2.0 VOUT=VADJ=0V TYP 1.9 VCEH VCEL 1.0 0 V V mV mV 0.18 0.56 0.32 V V 0.05 0.20 %/V 70 dB ±100 ppm/°С 250 A mA 1 RPD UNIT V µA µA 5.0 15.0 MΩ 6.0 0.4 V V TTSD Junction temperature 150 °С TTSR Junction temperature 120 °С BW=10Hz~100kHz 30 µVrms en UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 9 QW-R502-A30.a LR9273 Preliminary CMOS IC TEST CIRCUIT VIN C1 4.7µF CE VIN VOUT UTC LR9273 C2 4.7µF V VOUT GND Basic Test Circuit UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw IOUT A ISS VOUT UTC LR9273 C1 4.7µF CE C2 4.7µF GND Test Circuit for Supply Current 7 of 9 QW-R502-A30.a LR9273 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT Example of the Typical Application of UTC LR9273 (Fixed Output Type) Phase Compensation In these ICs, phase compensation is made with the output capacitor for securing stable operation even if the load current is varied. For this purpose, use as much as a capacitor as C2. Recommendation value is as follows: Mounting on PCB Make VDD and GND lines sufficient. If their impedance is high, a current flows, the noise picked up or unstable operation may result. Further use a 4.7μF or more value capacitor between VDD pin and GND pin as close as possible. Set an Output capacitor between VOUT pin and GND pin for phase compensation as close as possible. Technical Notes on Output Voltage Setting of Adjustable Output type VOUT R2 I2 ADJ RIC GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw VOUT IIC R3 I3 1.0V 8 of 9 QW-R502-A30.a LR9273 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT(Cont.) The Output Voltage may be adjustable for any output voltage between its 1.0V reference and its VDD setting level. An external pair of resistors is required, as shown above. The complete equation for the output voltage is described step by step as follows; I2=IIC+I3 ………… (1) I3=1.0/R3 ………… (2) Thus, I2=IIC+1.0/R3 ………… (3) Therefore, VOUT=1.0+R2×I2 ………… (4) Put Equation (3) into Equation (4), then VOUT=1.0+R2(IIC+1.0/R3) =1.0(1+R2/R3)+R2×IIC ………… (5) In 2nd term, or R2×IIC will produce an error in VOUT. In Equation (5), IIC=1.0/RIC ………… (6) R2×IIC=R2×1.0/RIC =1.0×R2/RIC ………… (7) RIC (MΩ) For better accuracy, choosing R2(<<RIC) reduces this error. 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 9 of 9 QW-R502-A30.a