LR18120

UNISONIC TECHNOLOGIES CO., LTD LR18120 2A LOW DROPOUT REGULATOR WITH ENABLE DESCRIPTION The UTC LR18120 is a positive voltage regulator with high performance. It has low dropout voltage and low input voltage, besides its output voltage can be fixed at 1.2V, 1.5V, 1.8V, or 2.5V depending on internal feedback resistors or ADJ (not connected to the ground) with external feedback resistors. The input voltage of UTC LR18120 can be low to 1.4V. There are two additional pin in the LR18120. One is EN pin and the other is POK pin. The UTC LR18120 is specially made for applications with low input voltage, low dropout voltage, and low output voltage which is almost the same as the input voltage. Typical applications include motherboards, notebooks, set top boxes, network cards and peripheral cards. CMOS IC FEATURES * VIN as Low as 1.4V and VPP Voltage 5V * VD=320mV @ IO=2A, VO=1.2V * Internal Over Current and Over Temperature Protection * With Enable Pin * Output Voltage: ±2% * 1.2V, 1.5V, 1.8V and 2.5V Output Voltage Adjustable Externally Using Resistors * When Disable VO Pull Low Resistance Lead-free: LR18120L-xx Halogen-free:LR18120G-xx ORDERING INFORMATION Normal LR18120-xx-S08-R LR18120-xx-SH2-R Ordering Number Lead Free Plating LR18120L-xx-S08-R LR18120L-xx-SH2-R Halogen Free LR18120G-xx-S08-R LR18120G-xx-SH2-R Package SOP-8 HSOP-8 Packing Tape Reel Tape Reel www.unisonic.com.tw Copyright © 2009 Unisonic Technologies Co., Ltd 1 of 8 QW-R502-305.A LR18120 PIN CONFIGURATION POK 1 8 GND CMOS IC VEN 2 7 ADJ VIN 3 6 VO VPP 4 5 NC SOP-8/HSOP-8 PIN DESCRIPTION PIN NO. 1 2 PIN NAME POK VEN DESCRIPTION This pin will Indicate high under this situation: VO reaches 92% of its rating voltage. Open-drain output. The enable control Input pin. As while as this pin’s voltage falls below 0.4V ,the LR18120 will stop working. When there’s nothing connected with this pin,the device will be enabled. The pin of input voltage. Placing large capacitance closely to this pin is necessary. There should be connected a 10µF ceramic capacitor. This pin is for input voltage to control circuit. Connected nothing. The voltage output pin. When this pin connected to the ground,VOUT will be set by the internal feedback resistors. Otherwise, if using external feedback resistors to decide the VOUT, VOUT = 0.8(R1+R2)/R2 Volts. Ground. 3 4 5 6 7 8 VIN VPP NC VO ADJ GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R502-305.A LR18120 BLOCK DIAGRAM CMOS IC + - + - UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R502-305.A LR18120 ABSOLUTE MAXIMUM RATING CMOS IC UNIT V °C °C °C PARAMETER SYMBOL RATINGS Input Voltage VPP, VIN 7 Power Dissipation PD Internally limited Junction Temperature TJ 150 Operation Temperature TOPR -40~ +85 Storage Temperature TSTG -65~ +150 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 CONDITIONS PARAMETER VIN Voltage VPP Voltage Temperature Range SYMBOL VIN VPP TA SYMBOL SOP-8 HSOP-8 SOP-8 HSOP-8 θJA θJC RATINGS 1.4 ~5.5 4.5~5.5 -40°C ≤TA ≤ +85°C RATINGS 150 143 20 14 UNIT V V °C UNIT °C/W °C/W °C/W °C/W THERMAL DATA PARAMETER Junction to Ambient Junction to Case ELECTRICAL CHARACTERISTICS VPP=5V, VIN =3.3V, VEN=VPP, IOUT =10mA, CIN=10µF, COUT =10µF, TA=TJ=25°C unless otherwise specified. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX VIN Input Voltage Range VIN 1.4 5.5 Quiescent Current (Ground Current) IQ VOUT=2.5V 1 2 VPP VPP Voltage Range VPP 4.5 5.5 IPPH VOUT =2.5V 0.23 0.5 VPP Current VEN=0V 36 60 IPPL VOUT Output Voltage (Internal Fixed Voltage) VOUT VIN= VOUT +0.5V, VOUT =2.5V 2.45 2.5 2.55 Line Regulation ΔVOUT ΔVIN × VOUT UNIT V mA V mA μA V % VIN=( VOUT +0.5V) ~ 5V 0.2 1 Load Regulation ΔVOUT 10mA≤IOUT≤2A 0.2 1 % Dropout Voltage VD IOUT=2A 250 320 mV Short Circuit Current 1.4 A VOUT Pull Low Resistance VEN=0V 90 Ω ADJ Reference Voltage VREF VADJ= VOUT 0.788 0.8 0.812 V Adjust Pin Current IADJ 20 100 nA Adjust Pin Threshold 0.15 0.2 0.25 V VEN VEN Pin Voltage High VH(EN) 1.6 V VEN Pin Voltage Low VL(EN) 0.4 V VEN Pin Bias Current IBIAS(EN) VEN=0V 12 40 μA POK VOUT Power OK Voltage VTHPOK 92 % Hysteresis VHYPOK 7 % Over Temperature Protection Over Temperature TOT 150 °C Over Temperature Hysteresis TOTHY 30 °C Note: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 8 QW-R502-305.A LR18120 TYPICAL APPLICATION CIRCUIT CMOS IC 0.8(R1 + R2) R2 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 8 QW-R502-305.A LR18120 TYPICAL CHARACTERISTICS (VCC= 3.3V, TA=25°C, unless otherwise noted.) Quiescent Current vs. Input Voltage 1 0.9 Quiescent Current, IQ (mA) Quiescent Current, IQ (mA) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 3 3.5 4 4.5 5 Input Voltage, VIN (v) 5.5 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 CMOS IC Quiescent Current vs. Temperature 0 -45-35-25-15 -5 5 15 25 35 45 55 65 75 85 Temperature (°C) IPPH Current vs. Temperature 0.5 0.45 IPPH Current, IIPPH (mA) 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 -45-35-25-15 -5 5 15 25 35 45 55 65 75 85 Temperature (°C) IPPL Current vs. Temperature 40 35 IPPL Current, IIPPL (µA) 30 25 20 15 10 5 0.5 0.45 IPPH Current, IIPPH (mA) 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 3 IPPH Current vs. Input Voltage 3.5 4 4.5 5 5.5 Input Voltage, VIN (v) IPPL Current vs. Input Voltage 40 35 IPPL Current, IIPPL (µA) 30 25 20 15 10 5 0 3 3.5 4 4.5 5 5.5 Input Voltage, VIN (v) 0 -45-35-25-15 -5 5 15 25 35 45 55 65 75 85 Temperature (°C) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 8 QW-R502-305.A LR18120 TYPICAL CHARACTERISTICS(Cont.) 2.55 2.54 Output Voltage, VO (V) 2.53 2.52 2.51 2.5 2.49 2.48 2.47 2.46 2.45 3 0.788 3.5 4 4.5 5 Input Voltage, VIN (v) 5.5 3 3.5 4 4.5 IO=0A Reference Voltage, VREF (V) Output Voltage vs. Input Voltage 0.812 0.808 0.804 0.8 0.796 0.792 CMOS IC Reference Voltage vs. Input Voltage 5 5.5 Input Voltage, VIN (v) Max. Power Dissipation vs.TAMB (still air) 3.5 Max. Dissipation Power, PD (W) 3 2.5 2 1.5 1 0.5 0 25 A=1.0 in2 A=1.5 in2 A=2.0 in2 A=5.0 in2 A=4.5 in2 A=4.0 in2 A=3.5 in2 A=3.0 in2 3.5 Max. Dissipation Power, PD (W) 3 2.5 2 1.5 1 0.5 0 Max. Power Dissipation vs. PCB Top Copper Area A=2.5 in2 A=0.5 in2 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 35 45 PCB Top Copper Area (in2) Load Transient Stop Stop 55 35 TAMB (°C) 75 85 Short Circuit Current VOUT IOUT VIN=3.3V,VOUT=2.5V,IOUT=0 to 2A UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 8 QW-R502-305.A LR18120 TYPICAL CHARACTERISTICS(Cont.) VIN Start up Waveform Stop VIN VOUT Tek Stop VPP VOUT VPP Start up Waveform CMOS IC VPP VIN VEN Start up Waveform Tek Stop VEN VOUT VPP VIN 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 8 of 8 QW-R502-305.A