ILC7280 IMPALA | Alldatasheet

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Ordering Information* (TA = -40°C to +85°C) ILC7280CS-2530 150mA 2.5V and 3.0V LDO regulators ILC7280CS-3028 150mA 3.0V and 2.8V LDO regulators ILC7280CS-2828 150mA 2.8V and 2.8V LDO regulators ILC7280CS-3030 150mA 3.0V and 3.0V LDO regulators ILC7280CS-3025 150mA 3.0V and 2.5V LDO regulators VINA VINB 1µF ceramic ENA ENB GND CNOISE 22pF (optional) 0.47-2.2µF ceramic VOUTA VOUTB 0.47-2.2µF ceramic 4.7µF The ILC7280 is two independent 150mA low dropout (LDO) voltage regulators in an 8-pin MSOP package. Each regu- lator output is independently short circuit protected and has independent enable lines. The device offers a unique com- bination of low dropout voltage and low quiescent current of CMOS as well as the low noise and high ripple rejection characteristics of bipolar LDO regulators. Moreover, only one input capacitor is required. Dropout Voltage: Typically 150mV at 150mA load, and 1mV at 1mA load. Ground pin current: Typically 130µA at 1mA load, and 135µA at 150mA load. Ripple Rejection: 55dB at 1kHz and 60dB at 100kHz. Shutdown mode: Less than 0.5µA quiescent current in shutdown mode. Small package: MSOP-8 Small capacitor: Requires only a 0.47µF external capacitor on the regulator output. Precision output: Output voltage trimmed to 1% accuracy. Output Noise: 80µV RMS, optional noise bypass capacitor at pin 3 will further reduce noise on V OUTA/B 2.8/2.8V Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation Impala Linear Corporation 1(408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance

  • Guaranteed 150mA output per regulator
  • Ultra low 150mV dropout at 150mA
  • 1% output voltage accuracy
  • Requires only 0.47µF output capacitor
  • Only 150µA ground current at 150mA load
  • 60dB ripple rejection at 1kHz (C OUT = 0.47µF)
  • 80µVRMS noise at BW = 300Hz to 50kHz
  • Excellent line and load transient response
  • Over current / over temperature protection
  • 8-pin MSOP package
  • -60dB cross talk
  • Cellular Phones, pagers and wireless headsets
  • Palmtops, organizers, PDAs and portable electronics
  • Battery powered portable appliances and equipment
  • Remote data accumulation and instrumentation General Description Features

Applications

Figure 1: Typical Application Note: Enable may be connected to V IN, CNOISE is common to both LDOs ILC7280

Micropower dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation 2(408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance Pin Number Pin Name VOUTA GND VOUTB CNOISE (optional) ENB VINB ENA VINA Pin Description Regulator Output A Ground Regulator Output B Voltage Reference Bypass: Connect external 22pF capacitor to GND to minimize output noise in regulator “A” or “B.” May be left open. Do not ground. Enable/Shutdown B (input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Do not leave floating. Supply Input B (Internally connected to pin 8) Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Do not leave floating. Supply Input A (Internally connected to pin 6) * Galvanic connection only. CNOISE(optional) 4 5

8 VINA

(TOP VIEW) ILC7280CS-XXXX Pin-Package Configurations Pin Functions ILC7280 *If maximum current required from each regulator then connect both pin 6 and pin 8 to V DD

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation 3(408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance Parameter Input Voltage S/D Input Voltage Output Current Output Voltage Power Dissipation Maximum Junction Temperature Storage Temperature ESD Rating Operating Input Voltage Operating Ambient Temperature Package Thermal Resistance Symbol VIN VS/D IOUT VOUT PD TJ(max) Tstg VIN TA θJA Ratings -0.3 to +12 -0.3 to VIN Short circuit protected -0.3 to 10 Internally Limited 175 -40~+125 2.1 to 8 -40 to +85 200 Units V mA V mW kV V °C/W Absolute Maximum Ratings (Note 1)

Micropower dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation 4(408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance Parameter Output Voltage Output Voltage Output Voltage Line Regulation Dropout Voltage (Note 3) Dropout Voltage (Note 3) Dropout Voltage (Note 3) Ground Pin Current One regulator on Ground Pin Current One regulator on Ground Pin Current One regulator on Ground pin Current Both regulator on Ground pin Current Both regulators on Ground pin Current Both regulators on Shutdown Current Symbol VOUT VOUT VOUT ∆VO/∆VIN VIN - VOUT VIN - VOUT VIN - VOUT IGND IGND IGND IGND IGND IGND IS/D Conditions IOUT = 1mA 1mA < IOUT < 100mA 1mA < IOUT < 100mA 1mA < IOUT < 150mA 1mA < IOUT < 150mA VO(NOM) + 1V < VIN < 10V IOUT = 0mA IOUT = 10mA IOUT =150mA IOUT = 0mA IOUT = 10mA IOUT = 150mA IOUT = 0mA IOUT = 10mA IOUT = 150mA Min Typ VOUT (Nom.) VOUT (Nom.) VOUT (Nom.) 0.007 0.1 150 100 135 105 115 150 0.1 Max 0.014 0.032 175 200 Units (Nom.) (Nom.) (Nom.) %/V mV mV mV µA µA µA µA µA µA µA Unless otherwise specified, all limits are at T A = 25°C; VIN = VO(NOM) + 1V, IOUT = 1mA, COUT = 0.47µF, VS/D = 2V. Boldface limits apply over the operating temperature range. (Note 2)

0.6 Typ 500 300 Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation 5(408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance Parameter Shut Down Input Voltage Peak Output Current (Note 4) Output Noise Voltage (RMS) Ripple Rejection Dynamic Line Regulation Dynamic Load Regulation Short Circuit Current Symbol VS/D IO(peak) eN ∆VO/∆VIN ∆VO(line) ∆VO(load) ISC Conditions High = Regulator On Low = Regulator Off VOUT > 0.95VO(NOM) BW = 300Hz to 50kHz, CNOISE = 0pF freq = 1kHz freq = 10kHz freq = 100kHz VIN: VO(NOM) + 1V to VO(NOM) + 2V; dVIN/dt = 1V/µS;lo = 150mA IOUT: 0 to 150mA; d(lOUT)/dt = 50A/µs, with COUT = 2.2µF VOUT = 0V Min 2.0 300 Units V mA µV dB mV mV mA Unless otherwise specified, all limits are at T A = 25°C; VIN = VO(NOM) + 1V, IOUT = 1mA, COUT = 0.47µF, VS/D = 2V. Boldface limits apply over the operating temperature range. (Note 2) Note1: Absolute maximum ratings indicate limits which when exceeded may result in damage to the component. Electrical specifications do not apply when operating the device outside of its rated operating conditions. Note 2: Specified Min/Max limits are production tested or guaranteed through correlation based on statistical control methods. Measure ments are taken at constant junction temperature as close to ambient as possible using low duty pulse testing. Note 3: Dropout Voltage is defined as the measured Differential Voltage between input and output voltage, when the output voltage drops 2% below the nominal output voltage as VIN is decreased, and approaches VOUT . Nominal output voltage is defined at V IN = VOUT + 1V. Note 4: Guaranteed by design

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation 6(408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance CURRENT LIMIT THERMAL SHUTDOWN VOUTA ENA VINA BANDGAP REF. VOUTB *CNOISE ENB VINB CURRENT LIMIT THERMAL SHUTDOWN GND *Optional

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation 7(408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance Output Capacitor An output capacitor is required from V OUTA and VOUTB to GND to prevent oscillation and minimize the effect of load transient currents. The minimum size of the output capac- itor(s) is dependent on the usage of C NOISE and its value. Without C NOISE, a minimum of 1µF is recommended. For CNOISE = 22pF, a minimum of 2.2µF is recommended (See figure 1). Larger values of output capacitance will slow the regulator's response during power up. The upper limit of capacitance is indefinite, however, it should have an equivalent series resistance (ESR) of approximately 5Ω or less and a series resonance above 1MHz. Stability is assured with the use of a capacitor having ultra-low ESR and as such will not produce low amplitude oscilla- tions nor an underdamped transient response. This allows the use of modern ceramic capacitors in prefer- ence to their more costly Tantalum counterparts. If the system design calls for smaller load currents, lower capacitance may be used. Below 10mA the capacitance may be reduced to 0.47µF and below 1mA to 0.33µF. No-Load Stability 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 sys- tems. Split-Supply Operation When using the ILC7280 in a system requiring that the load be returned to the negative voltage source, the out- put(s) must be diode clamped to inhibit significant volt- age excursions below ground. A simple external diode clamp to ground will afford protection from damage to the device. (See figure below). APPLICATIONS INFORMATION +VIN A and B These pins are connected internally through a galvanic connection for maximum power from each regulator, both V INA and VINB must be connected externally to V DD. Enable/Shutdown Forcing EN A and/or EN B to a voltage greater than 2V, enables the regulator(s). These inputs are CMOS logic compatible gates. If this feature is not required, connect EN A and/or EN B to VIN. Note that V INA and VINB are con- nected internally. To minimize the effect of imbalanced current sharing and possible noise, both V INA and V INB should also be connected externally. Input Capacitor A 1µF capacitor should be placed from V INA/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. Reference Bypass Capacitor CNOISE (the reference voltage bypass capacitor) is con- nected to the internal V ref which is common to regulator's A and B. A 22pF capacitor connected between C NOISE and GND decouples the reference output voltage and provides a significant reduction in regulator output noise. An effect of C NOISE also reduces the regulator phase margin. When using C NOISE, output capacitors of 2.2µF or greater are required to maintain stability. Also affected by CNOISE is the start up speed of the ICL7280. The speed is inversely proportional to the value of CNOISE. 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 omis- sion with the pin left open. The trade-off of noise to response should be considered. +VIN ENA/ENB -VIN ILC7280 Dual Regulator VOUTA or VOUTB Dext Rload External Diode, Dext inhibits significant voltage excursions below ground in a split power supply load return.

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation 8(408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance Thermal Considerations For optimum Thermal dissipation and device reliability, devices mounted on conventional FR4 PCB material should be surrounded and connected to as much ground copper as possible. In a worse case application with min- imum trace widths and no ground plane, the MSOP-8 package exhibits a thermal resistance of 200 °C/W. The risk to the device can be calculated in the following exam- ples. (An Excel spreadsheet calculator is also available at the Impala Linear web site: Products/ILC7280.) Thermal Evaluation Examples For an ambient temperature of 50°C, the maximum pack- age power dissipation is: P D(max) = (125°C - 50°C) / 200°C/W P D(max) = 375mW 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: P D(each regulator) = (V IN - VOUT) * IOUT + (VIN * IGND) P D(each regulator) = (4V - 3V) * 150mA + (4V * 0.12mA) P D(each regulator) = 150mW P D(both regulators) = 2 * 150mW P D(both regulators) = 300mW In this example the total power dissipated is 300mW which is below the 375mW 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. For example in a 5V input and 3V output application at 50°C, one regulator operating at 150ma would dissipate 267.5mW. The remaining regulator must be limited to 375mW - 267.5mW or 107.5mW. An advantage of the ILC7280 low-dropout voltage charac- teristic is that using the lowest possible input voltage can minimize power dissipation. APPLICATIONS INFORMATION cont.

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation 9(408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance Devices sold by Impala Linear Corporation are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Impala Linear Corporation makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Impala Linear Corporation makes no warranty of merchantability or fitness for any purpose. Impala Linear Corporation reserves the right to discontinue production and change specifications and prices at any time and without notice. This product is intended for use in normal commercial applications. Applications requiring an extended temperature range, unusual environmental requirements, or high reliability applications, such as military and aerospace, are specif- ically not recommended without additional processing by Impala Linear Corporation. Impala Linear Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in an Impala Linear Corporation product. No other circuits, patents, licenses are implied. Life Support Policy Impala Linear Corporation’s products are not authorized for use as critical components in life support devices or systems. 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 whose failure to perform, when properly used in accordance with instructions for use pro- vided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reason- ably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 0.0215 0.037

3 TYP

0.006 RAD. TYP 0.116

12 TYP

0.118 0.000-0.005 RAD. TYP 0.040 0.004 SEATING PLANE 0.118 ± 0.004

0.020 TYP

0.013 TYP

0.0256 BSC

0.118 ± 0.004 All dimensions in inches Package Dimensions MSOP-8