LD8103 02/21/2005 Dual OP-Amp and 2.5V±0.7% Voltage Reference General Description Features The LD8103 consists of 2 low-offset voltage amplifiers and a • Precision ±0.7% Voltage Reference high-accuracy 2.5V voltage reference in a SOP-8 package. • VREF Sinking Current Capability: 1mA to 100mA The LD8103 provides a low cost and space saving solution • Low Input Offset Voltage for the applications such as power supplies and switching • Max. 27V Voltage Rating • SOP-8 Package adapters. The LD8103 is available in a SOP-8 package. It can operate Applications over the ambient temperature range from -40°C to 105°C. • Switching Power Supply and Adapter • Portable Device • Motherboard (Controller of Linear Power) Typical Application --- CC/CV Control for Switching Adapters 1 Leadtrend Technology Corporation LD8103-DS-00 February 2005 LD8103 Pin Configuration VCC OUT2 IN2- IN2+ SOP-8 (TOP VIEW) 8 7 6 5 TOP MARK YY: Year code WW: week code PP: production code 2 3 4 IN1+ GND OUT1 1 IN1- YYWWPP Ordering Information Part number Package TOP MARK Shipping LD8103 CS SOP-8 LD8103CS 2500 /tape & reel LD8103 PS SOP-8 (PB Free) LD8103PS 2500 /tape & reel Pin Descriptions PIN NAME 1 OUT1 FUNCTION Output of OP-amp 1 2 IN1- Negative terminal of OP-amp 1 3 IN1+ Positive terminal of OP-amp 1, connected to internal reference voltage 4 GND Ground 5 IN2+ Positive terminal of OP-amp 2 6 IN2- 7 OUT2 Output of OP-amp 2 Negative terminal of OP-amp 2 8 VCC Supply voltage 2 Leadtrend Technology Corporation LD8103-DS-00 February 2005 LD8103 Block Diagram OUT1 VCC IN1- OUT2 IN1+ IN2- GND IN2+ Absolute Maximum Ratings Supply Voltage Vcc 27V Differential Input Voltage (IN1+ to IN1-, IN2+ to IN2-) 27V Input Voltage -0.3V to Vcc+0.3V Maximum Junction Temperature 150°C Operating Ambient Temperature Range -40°C to 105°C Storage Temperature Range -65°C to 150°C Lead Temperature (LD8103CS, 10 sec.) 230°C Lead Temperature (LD8103PS, 10 sec.) 260°C Junction-to-Ambient Thermal Resistance 160°C/W ESD Level (Human Body Model) 2KV Caution: Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not limited. 3 Leadtrend Technology Corporation LD8103-DS-00 February 2005 LD8103 Electrical Characteristics PARAMETER CONDITIONS ° MIN ° Vcc =5V, -40 C~105 C Total Supply Current (No Load) ° TYP MAX 0.7 1.2 UNITS mA ° 2 Vcc =27V, -40 C~105 C o (Vcc=+5V,TA = +25 C unless otherwise stated) PARAMETER CONDITIONS MIN TYP MAX UNITS 1 4 mV 5 mV OP-Amp1 & OP-Amp2 ° Input Offset voltage 25 C (Common mode Voltage =0V) -40°C~105 C ° Input Offset Voltage Drift Input Bias Current (OP1) Input Bias Current (OP2) Output Source Current ° 25 C 20 25°C 20 ° ° -40 C~105 C VCC=15V, VO=2V Differential Input Voltage = 1V VCC=15V, Vo=2V Output Sink Current Differential Input Voltage = -1V VCC=15V, Vo=0.2V Differential Input Voltage = -1V Output Short Current 20 ° ° VCC=27V,RL=2K, -40 C~105 C ° VCC=27V,RL=10K, 25 C ° ° mA V 25 V 24 V 50 Vo=1.4V~11.4V, 25 C Gain Bandwidth Product Total Harmonic Distortion ° VIN=0.5V~2V, VCC=15V RL=2K, CL=100pF, Unity Gain Common Mode Voltage=0V VCC=5~27V VCC=27V, RL=2K, CL=100pF F=100KHz, VIN=10mV VCC=27V, RL=2K, CL=100pF VO=2Vpp, f=1KHz, AV=20dB 4 Leadtrend Technology Corporation LD8103-DS-00 February 2005 mV V/mV V/mV 100 VCC=15V, RL=2K, Vo=1.4V~11.4V, -40 C~105 C Supply Voltage Rejection Ratio 100 ° Vo=1.4V~11.4V, -40 C~105 C ° Slew Rate at Unity Gain 20 20 VCC=15V, RL=2K ° mA V 5 VCC=15V, RL=2K, Large Signal Voltage Gain (OP2) 60 23 ° ° µA 24 RL=10K, -40 C~105 C Large Signal Voltage Gain (OP1) mA 23 RL=10K, 25 C ° nA 50 ° Output Voltage --- Low Level 200 12 24 VCC=27V,RL=10K, -40 C~105 C nA 40 40 ° nA 150 10 VCC=15V VCC=27V,RL=2K, 25 C Output Voltage --- High Level ° µV/ C 7 25 V/mV 0.2 0.4 V/µS 65 100 dB 0.5 0.9 MHz 0.02 % LD8103 PARAMETER CONDITIONS MIN TYP MAX UNITS 2 75 nA 150 nA Vcc-1.5 V OP-Amp2 ° 25 C Input Offset Current ° ° -40 C~105 C ° Input Common Mode Voltage Range VCC=27V, 25 C 0 ° ° VCC=27V, -40 C~105 C ° 25 C Common Mode Rejection Ratio ° ° -40 C~105 C Equivalent Input Noise Voltage 0 70 CONDITIONS dB 50 MIN V dB 60 F=1KHz, Rs=100Ω, VCC=27V PARAMETER Vcc-2 85 TYP nV / Hz MAX UNITS 100 mA Reference Voltage Cathode Current 1 ° 25 C Reference Voltage (IK=10mA) Reference Input Voltage Deviation over Temperature Range (IK=10mA) Minimum Cathode Current ° ° ° ° -40 C~105 C -40 C~105 C for Regulation Dynamic Impedance ∆IK =1~100mA, f<1KHz 5 Leadtrend Technology Corporation LD8103-DS-00 February 2005 2.482 2.500 2.518 V 2.465 2.500 2.535 V 7 30 mV 0.5 1 mA 0.2 0.5 Ω LD8103 Typical Performance Characteristics Cathode current (mA) 100 150 (Ω) 80 IN1+ 60 Cathod Current VTEST 40 LD8103 Capacitive Unstable area Load? 20 GND 1E-4 1E-3 0.01 0.1 1 10 Capacitive load (µF) Stability behavior with capacitor loads Fig. 1 Stability Boundary Conditions Fig. 2 Test Circuit of Stability Boundary Conditions Note: For the shunt regulators like TL431, the stability of capacitive load should be taken into account carefully. figure1, the areas within the curves represent the conditions that may cause the VREF to oscillate. 6 Leadtrend Technology Corporation LD8103-DS-00 February 2005 As shown in LD8103 Reference Application Circuit #1 --- CC/CV Control for Switching Adapters AC input EMI Filter VCC 40V UVLO OUT 16V/ 11.7V RT COMP LD755X OSC Control Logic Divider LD8103 CS GND photocoupler 7 Leadtrend Technology Corporation LD8103-DS-00 February 2005 LD8103 Reference Application Circuit #2 --- Motherboard (Controller of Linear Power) 8 Leadtrend Technology Corporation LD8103-DS-00 February 2005 LD8103 Package Information SOP-8 H A M J B F C I D Dimensions in Millimeters Dimensions in Inch Symbols MIN MAX MIN MAX A 4.801 5.004 0.189 0.197 B 3.810 3.988 0.150 0.157 C 1.346 1.753 0.053 0.069 D 0.330 0.508 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.178 0.229 0.007 0.009 I 0.102 0.254 0.004 0.010 J 5.791 6.198 0.228 0.244 M 0.406 1.270 0.016 0.050 θ 0 8 0 8 o o Important Notice Leadtrend Technology Corp. reserves the right to make changes or corrections to its products at any time without notice. Customers should verify the datasheets are current and complete before placing order. 9 Leadtrend Technology Corporation LD8103-DS-00 February 2005