www.fairchildsemi.com ILC7280 Micropower Dual 150mA CMOS RF LDO™ Regulators Features General Description • • • • • • • • • • The ILC7280 is two independent 150mA low dropout (LDO)voltage regulators in an 8-pin MSOP package. Each regulator output is independently short circuit protected and has independent enable lines. The device offers a unique combination of low dropout voltage and low quiescent current offered by CMOS technology as well as the low noise and good ripple rejection characteristics of bipolar LDO regulators. Low Power Consumption 150mV Dropout at 150mA 1% Output Voltage Accuracy Requires only 0.47µF Output Capacitor Only 135µA Ground Current at 150mA load 50µVRMS Noise at BW = 300Hz to 50kHz Excellent Line and Load Transient Response Over Current/Over Temperature Protection 8-pin MSOP package Voltage Options Available: 3.3/3.3V, 3.0/3.0V, 3.0/2.8V, 3.0/2.5V, 2.8/2.8V, 2.85/2.85V. Other Custom Values available upon request. • Minimum External Components The ILC7280 is available in a space saving MSOP-8 package. Applications • • • • Cellular Phones, pagers and wireless headsets Palmtops, organizers, PDAs and portable electronics Battery powered portable appliances and equipment Remote data accumulation and instrumentation Block Diagram VINA VOUTA – + ENA Current Limit Thermal Shutdown *CNOISE Bandgap Reference GND Current Limit Thermal Shutdown ENB + – VINB VOUTB *Optional REV. 1.0.5 6/3/02 ILC7280 PRODUCT SPECIFICATION Pin Configuration VOUTA 1 8 VINA GND 2 7 ENA VOUTB 3 6 VINB CNOISE 4 5 ENB (Optional) MSOP-8 Pin Definitions Pin Number Pin Name Pin Function Description 1 VOUTA Output A.Regulated voltage 2 GND Ground of the IC 3 VOUTB Output B.Regulated voltage 4 CNOISE Optional bypass for noise reduction. 5 ENA Digital Input Enable for regulator A 6 VINB Supply input B.Internally connected to pin 8* 7 ENB Digital Input Enable for regulator B 8 VINA Supply input B.Internally connected to pin 6* *If maximum current is required from each regulator, then connect both pin 6 and 8 to power supply. Absolute Maximum Ratings Absolute maximum ratings are the values beyond which the device may be damaged or have its useful life impaired. Functional operation under these conditions is not implied. Parameter Min. Supply Voltage: VINA or VINB to GND Max. Units 10 V Voltage on all other pin to GND –0.3 VIN + 0.3 V Junction Temperature –65 150 °C Storage Temperature –65 150 °C Lead Soldering Temperature, 10 seconds 300 °C Power Dissipation at 85°C 315 mW Recommended Operating Conditions Parameter Supply Voltage VDD Output Current Ambient Operating Temperature 2 Conditions VINA or VINB to GND Min. VOUT + VDO IOUT -40 Typ. VOUT + 1V Max. 9 Units V 150 mA 85 °C REV. 1.0.5 6/3/02 PRODUCT SPECIFICATION ILC7280 Electrical Specifications (All values are for each regulator at VIN=VOUTnom+1V, IOUT=1mA, COUT=0.47µF, CN=0, VEN=2V and TA = +25°C using Test circuit in Figure 1, unless otherwise noted.) Parameter Conditions Min. Typ. Max. Units 0.99 VOUTnom VOUTnom 1.01 VOUTnom V IOUT = 10mA 5.5 7 mV Output Voltage Dropout Voltage IOUT = 150mA 155 180 Line Regulation VOUT + 1V ≤ VIN ≤ VOUT + 2V 0.2 0.5 %/V Load Regulation IOUT: 1mA to 150mA 0.3 0.75 % Ground Pin Current One Regulator ON IOUT = 0mA 80 105 µA IOUT = 10mA 85 110 IOUT = 150mA 95 125 Ground Pin Current Both Regulators ON IOUT = 0mA 120 IOUT = 10mA 125 IOUT = 150mA 135 VEN = 0V 150 OFF State Current Enable Input Current Shut Down Input Voltage µA 220 nA µA VOUT = 2V 4 10 VOUT = 0.6 0.2 0.5 High = Regulator ON 2 V Low = Regulator OFF 0.6 Output Voltage Noise COUT = 2.2µF, CN=1nF, IOUT = 10mA, BW = 300Hz to 50kHz 50 µVrms Ripple Rejection COUT = 4.7µF, f = 120Hz 50 dB COUT = 4.7µF, f = 1KHz 45 VIN: VOUT + 1V to VOUT + 2V dV/dt = 1V/µS 20 mV 10 mV Dynamic Line Regulation Dynamic Load Regulation IOUT: 0 to 150mA DI/dt = 1A/µS VINA VOUTA COUT ENA VINB VOUTB COUT VIN CIN CN ENB Figure 1. Test Circuit REV. 1.0.5 6/3/02 3 ILC7280 PRODUCT SPECIFICATION Typical Applications Diagrams Power Spectral Density and Output Noise Voltage Thermal Protection Under Short Circuit Conditions COUT=2.2µF CNOISE=1nF Load=10mA BW=300Hz to 50kHz Isc(0.5A/div) ON/OFF Response, One Regulator ON ON/OFF Response, Both Regulators ON VEN VOUT@ 10mA load, COUT=2.2µF, CN=1nF VOUT@ 100mA load COUT=2.2µF CN=0 Ripple Rejection, Low Frequencies COUT=4.7µF Load=10mA 4 VEN Ripple Rejection, High Frequencies COUT=4.7µF Load=10mA REV. 1.0.5 6/3/02 PRODUCT SPECIFICATION ILC7280 Ripple Rejection, Low Frequencies, 150mA Load Ripple Rejection, High Frequencies, 150mA Load Line Transient Response, 10mA Load Load Transient Response VIN VOUT(AC) ILOAD (0.1A/div) VOUT(AC) Ground Current (µA) Ground Pin Current, Both Regulators ON 350 300 250 200 150 100 50 0 VOUTnom no load 150mA load 0 1 2 3 4 5 6 7 8 9 10 Input Voltage (V) REV. 1.0.5 6/3/02 5 ILC7280 PRODUCT SPECIFICATION 1.206 200 1.204 180 160 140 120 1.202 1.200 1.198 1.196 1.194 1.192 1.190 -40 -30 -20 -10 0 85°C 100 80 25°C -40°C 60 40 20 10 20 30 40 50 60 70 80 90 Temperature, °C 6 Dropout Voltage vs. IOUT Dropout Voltage, mV Reference Voltage,V Reference Voltage vs. Temperature 0 0 50 100 150 Output Current, mA REV. 1.0.5 6/3/02 PRODUCT SPECIFICATION ILC7280 Application Information No-load Stability VIN A and B The ILC7280 will remain stable and in regulation with no load current. These are desirable performance features for applications such as keep-alive modes in CMOS systems. These pins are connected internally through a galvanic connection. For maximum power from each regulator, both VINA and VINB must be connected externally to V+. Enable/Shutdown Forcing ENA and/or ENB to a voltage greater than 2V, enables the regulator(s). These inputs are CMOS logic compatible gates. If this feature is not required, connect ENAand/or ENB to VIN. Note that VINA and VINB are connected internally. To minimize the effect of imbalanced current sharing and possible noise, both VINA and VINB should also be connected externally. Split-Supply Operation When using the ILC7280 in a system requiring that the load be returned to the negative voltage source, the output(s) must be diode clamped to inhibit significant voltage excursions below ground. A simple external diode clamp to ground will protect the device from damage. Thermal Considerations A 1µF capacitor should be placed from VINA/B to GND if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input. In order to minimize thermal resistance (θJA), the device mounted on conventional FR4 PCB material should be surrounded as much ground copper ground plane as possible. In a worst case application with minimum trace widths and no ground plane, the MSOP-8 package exhibits a thermal resistance of 200 °C/W. The maximum allowable power dissipation is calculated in the following examples. Reference Bypass Capacitor Thermal Evaluation Examples CNOISE (the reference voltage bypass capacitor) may be connected to the internal VREF which is common to regulator’s A and B. The maximum allowed package power dissipation is: Input Capacitor For low noise applications use of 1nF CNOISE is recommended. Value higher than 1nF will lead to minimum improvement of output noise, but it will substantially increase the start-up time. Lower value of CNOISE results in faster start –up. If a slow or delayed start up time is desired, a larger value of CNOISE is used. Conversely, faster start up times or instant-on applications will require smaller values of CNOISE or its omission with the pin left open. The tradeoff of noise to response time should be considered. PD(max) =(TJmax–TA) / θJA, where TJmax is the maximum junction temperature and TA is the ambient temperature. For an ambient temperature of 50°C PD(max) = (150°C - 50°C) / 200°C/W PD(max) = 500mW If the intent is to operate from a 4V power source with a 150mA load current from both outputs at a 50°C ambient temperature, the expected power dissipation is found in the following calculation: Output Capacitor An output capacitor is required from VOUTA and VOUTB to GND to prevent oscillation and minimize the effect of load transient currents. The minimum size of the output capacitor(s) is dependent on the usage of CNOISE and its value. Without CNOISE, a minimum of 0.47µF is recommended. For CNOISE = 1nF, a minimum of 2.2µF is recommended. Larger values of output capacitance will slightly slow the regulator’s response during power up. The ILC7280 remains stable even with ESR values as low as 10mΩ. PD (each regulator) = (VIN – VOUT) * IOUT + (VIN * IGND) PD (each regulator) = (4V – 3V) * 150mA + (4V * 0.12mA) PD (each regulator) = 150mW PD (both regulators) = 2 * 150mW PD (both regulators) = 300mW In this example the total power dissipated is 300mW which is below the 500mW maximum package consideration and therefore safe to operate. It should be noted that it is not always possible to operate both regulators at the maximum output current. If the system design calls for smaller load currents, lower capacitance may be used. Below 10mA the capacitance may be reduced to 0.33µF. REV. 1.0.5 6/3/02 7 PRODUCT SPECIFICATION ILC7280 Mechanical Dimensions MSOP-8 0.118 - 0.004 [3 ± 0.1] 8 –A– SYMM C 5 (0.189) [4.8] 0.118 ± 0.004 [3 ± 0.1] 0.193 ± 0.004 [4.9 ± 0.1] –B– (0.040) TYP [1.02] PIN 1 IDENT (0.016) TYP [0.41] 1 4 LAND PATTERN RECOMMENDATION (0.0256) TYP [0.65] R 0.030 - 0.037 [0.78 - 0.94] (0.0256) TYP [0.65] 0.005 TYP [0.13] R 0.005 TYP [0.13] GAGE PLANE (0.010) [0.23] –C– 0.002 [0.05] C 0.002 - 0.006 TYP [0.06 - 0.15] 0.012 ± 0.002 TYP [0.3 ± 0.05] 0.002 [0.05] M 0.021 ± 0.005 [0.53 ± 0.12] (0.033) [0.84] A S B S 0.0375 [0.953] 0°–6° TYP SEATING PLANE 0.007 ± 0.002 TYP [0.18 ± 0.05] REV. 1.0.5 6/3/02 8 ILC7280 PRODUCT SPECIFICATION Ordering Information Part Number VOUT Temperature Range (°C) Package ILC7280AR2530X 2.5V and 3.0V -40 to +85 MSOP-8 ILC7280AR2830X 3.0V and 2.8V -40 to +85 MSOP-8 ILC7280AR2828X 2.8V and 2.8V -40 to +85 MSOP-8 ILC7280AR8585X 2.85V and 2.85V -40 to +85 MSOP-8 ILC7280AR3030X 3.0V and 3.0V -40 to +85 MSOP-8 ILC7280AR3333X 3.3V and 3.3V -40 to +85 MSOP-8 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 6/3/02 0.0m 002 Stock#DS30007280 2002 Fairchild Semiconductor Corporation