A Product Line of Diodes Incorporated ZXRE060 0.6V ADJUSTABLE PRECISION SHUNT REGULATOR Description Pin Assignments The ZXRE060 is a 5-terminal adjustable shunt regulator offering excellent temperature stability and output handling capability up to 20mA. The ZXRE060 simplifies the design of isolated low voltage DC-DC regulators. With its low 0.6V FB pin, it can control the regulation of rails as low 0.6V. This makes it ideal for state of the art microprocessor/DSP and PLD core voltage POL converters. ZXRE060_H5 (SC70-5/SOT353) and ZXRE060_ET5 (TSOT23-5) The device open-collector output can operate from 0.2V to 18V and regulated output voltage can be set by selection of two external divider resistors. Separating the input from the open collector output enables the ZXRE060 to be used to make low-cost low drop-out regulators operating at low input voltages. The ZXRE060 is available in two grades with initial tolerances of 0.5% and 1% for the A and standard grades respectively. It is available in space saving low profile 5 pin SC70/SOT353 and Thin SOT23 packages. The ZXRE060 in TSOT23-5 has its OUT, GND and FB pins matching the Cathode, Anode and reference pins of the TL432 and TLV431 in SOT23-3, thereby facilitating simple upgrade paths. Typical Application Circuit Features • • • • • • • • Low reference voltage (VFB = 0.6V) -40 to 125ºC temperature range Reference voltage tolerance at 25°C o 0.5% ZXRE060A o 1% ZXRE060 Typical temperature drift o <4 mV (0°C to 70°C) o <6 mV (-40°C to 85°C) o <12mV (-40°C to 125°C) 0.2V to 18V open-collector output High power supply rejection o (>45dB at 300kHz) Lead Free by design/RoHS Compliant (Note 1) “Green”/Halogen free device (Note 2) Applications • • • • • Notes: Isolated DC-DC converters Core voltage POL Low Voltage Low-Dropout linear regulators Shunt regulators Adjustable voltage reference 1. No purposefully added lead. 2. Diodes Inc.’s “Green” ploicy can be found on our website at http://www.diodes.com/products/lead_free/index.php. ZXRE060 Document number: DS33611 Rev. 2 - 2 1 of 10 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE060 Pin Description Pin 1 2 3 4 Name PGND GND IN FB 5 OUT Function Power Ground: Ground return for emitter of output transistor: Connect PGND and GND together. Analog Ground: Ground return for reference and amplifier: Connect GND and PGND together. Supply Input. Connect a 0.1μF ceramic capacitor close to the device from IN to GND. Feedback Input. Regulates to 600mV nominal. Output. Connect a capacitor close to device between OUT and GND. See the Applications Information section. Function Block Diagram The ZXRE060 differs from most other shunt regulators in that it has separate input and output pins and a low voltage reference. This enables it to regulate rails down to 600mV and makes the part ideal for isolated power supply applications that use optocouplers in the feedback loop and where the open-collector output is required to operate down to voltages as low as 200mV. The wide input voltage range of 2V to 18V and output voltage range of 0.2V to 18V enables the ZXRE060 to be powered from an auxiliary rail, while controlling a master rail which is above the auxiliary rail voltage, or below the minimum VIN voltage. This allows it to operate as a low-dropout voltage regulator for microprocessor/DSP/PLD cores. As with other shunt regulators (and shunt references), the ZXRE060 compares its internal amplifier FB pin to a high accuracy internal reference; if FB is below the reference then OUT turns off, but if FB is above the reference then OUT sinks current – up to a maximum of 15mA. ZXRE060 Document number: DS33611 Rev. 2 - 2 2 of 10 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE060 Absolute Maximum Ratings (Voltages to GND Unless Otherwise Stated) Symbol VIN VOUT VFB PGND TJ TST Parameter IN Voltage relative to GND OUT Voltage relative to GND FB Voltage relative to GND PGND Voltage relative to GND Operating Junction Temperture Storage Temperature Rating 20 20 20 -0.3 to +0.3 -40 to 150 55 to 150 Unit V V V V °C °C These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute maximum rating for extended periods may reduce device reliability. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. Package Thermal Data Package θJA SC70-5/SOT353 TSOT23-5 400°C/W 250°C/W PDIS TA = 25°C, TJ = 150°C 310mW 500mW Recommended Operating Conditions Symbol VIN VIN VOUT IOUT TA Parameter IN Voltage Range (0 to 125°C) IN Voltage Range (-40 to 0°C) OUT Voltage Range OUT Pin Current Operating Ambient Temperature Range ZXRE060 Document number: DS33611 Rev. 2 - 2 Min 2 2.2 0.2 0.3 Max 18 18 18 15 Units -40 125 °C 3 of 10 www.diodes.com V mA November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE060 Electrical Characteristics TA = 25°C, VIN = 3.3V, VOUT = VFB, IOUT = 5mA unless otherwise stated (Note 3). Symbol Parameter Conditions TA = 0°C to 85°C VFB Feedback voltage ZXRE060A ZXRE060 ZXRE060A ZXRE060 Min 0.597 0.594 0.595 0.592 Typ 0.6 0.6 Max 0.603 0.606 0.605 0.608 Units ZXRE060A 0.594 0.606 V ZXRE060 0.591 0.609 ZXRE060A 0.593 0.607 ZXRE060 0.590 0.610 TA = -40°C to 85°C TA = -40°C to 125°C FBLOAD Feedback pin load regulation FBLINE Feedback pin line regulation FBOVR Output voltage regulation FB input bias current IFB 3.8 IOUT = 1 to 15mA TA = -40 to 125°C VIN = 2V to 18V VIN = 2.2V to 18V VOUT = 0.2V to 18V, IOUT =1mA (Ref. Figure 1) 0.1 TA = -40 to 125°C TA = -40 to 125°C 6 10 1 1.5 1 1.5 -45 VIN = 18V TA = -40 to 125°C -200 0 0.35 VIN = 2V to 18V IIN mV nA mA TA = -40 to 125°C 1 Input current VIN = 2V to 18V 0.48 1 IOUT =10mA VIN = 2.2V to 18V IOUT(LK) OUT leakage current ZOUT Dynamic Output Impedance VIN = 18V, VOUT = 18V, VFB =0V IOUT = 1 to 15mA f < 1kHz mA TA = -40 to 125°C BW G 1.5 0.1 TA = 125°C 1 0.25 TA = -40 to125°C f=300kHz Power supply rejection ratio VAC= 0.3VPP Amplifier Unity Gain Ref: Fig 2 Frequency Amplifier Transconductance PSRR Note: mV 0.7 IOUT =0.3mA VIN = 2.2V to 18V mV 0.4 0.6 µA Ω >45 dB 600 kHz 5000 mA/V 3. Production testing of the device is performed at 25 °C. Functional operation of the device and parameters specified over the operating temperature range are guaranteed by design, characterisation and process control. ZXRE060 Document number: DS33611 Rev. 2 - 2 4 of 10 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE060 Typical Characteristics ZXRE060 Document number: DS33611 Rev. 2 - 2 5 of 10 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE060 Typical Operating Conditions (Cont.) 200 200 225° 225° V OUT = 0.6V COU T = 0. 22F V OUT = 0.6V 150 180° 100 135° 100 135° 50 90° 50 90° 0 45° Phase 180° Gain (dB) 150 Phase Gain (dB) COU T = 0. 22F 45° 0 G ain Phase G ain Phase 0° 100 1K 10K 100K 1M Frequency (Hz) Frequency and Phase Characteristics for VO UT = 0.6V -50 1 10 0° 100 1K 10K 100K 1M Frequency (Hz) Frequency and Phase Characteristics for VO UT = 0.6V -50 1 10 Figure 2. Test circuits for gain and phase plots ZXRE060 Document number: DS33611 Rev. 2 - 2 6 of 10 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE060 Application Information The following show some typical application examples for the ZXRE060. It is recommended to include the compensation capacitor C2 to guarantee stability. C2 may range in value from 0.1µF to 10µF depending on the application and the environment. Both C1 and C2 should be as close to the ZXRE060 as possible and connected to it with the shortest possible track. In the case of and, it means the opto-coupler will have to be carefully positioned to enable this. Figure 3. 0.6V Shunt Regulator Figure 4. 1.0V Shunt Regulator R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ R2 ⎠ ⎝ VOUT = VREF R3 = VIN − VOUT IR3 Figure 6. 1.0V series LDO regulator Figure 5. 0.6V series LDO regulator R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ R2 ⎠ ⎝ VOUT = VREF 1. 2. Design guides Determine IOUT and choose a suitable transistor taking power dissipation into consideration. Determine IB from I = IOUT(max) 3. Determine IR3 from 4. conventional references. There is only an output leakage current which is a maximum of 1µA. Nevertheless, it is necessary to determine an IKA(min) to ensure that the device operates within its linear range at all times. IKA(min) ≥ 10µA should be adequate for this. Determine R3 from R3 = VIN − ( VOUT + VBE ) . 5. Although unlikely to be a problem, ensure that IR3 ≤ 15 mA. B (hFE(min) + 1) IR3 ≥ IB + IKA (min) . The design of the ZXRE060 effectively means there is no IKA(min) limitation as in IR3 ZXRE060 Document number: DS33611 Rev. 2 - 2 7 of 10 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE060 Application Information (Continued) R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ R2 ⎠ ⎝ ( VOUT ≥ 0.2V + VBE ) R3 = VIN − VOUT IR3 Figure 7. 1V Current-boosted shunt regulator Design guides 1. 2. Determine IOUT and choose a suitable transistor taking power dissipation into consideration. Determine IB from I = IOUT(max) 3. Determine IR3 from IR3 = IOUT(max) 4. Determine R3 from R3 = 5. It is best to let the ZXRE060 supply as much current as it can before bringing Q1 into conduction. Not only does this minimise the strain on Q1, it also guarantees the most stable operation. Choose a nominal value between 10mA and <15mA for this current, IR4. Calculate R4 from R4 = VBE 6. B (hFE(min) + 1) VIN − VOUT IR3 IR4 VOUT goes low and LED is lit when monitored supply R1 ⎞ ⎛ VM > VREF ⎜ 1 + ⎟ ⎝ R2 ⎠ V − ( VF + 0.2) R3 = IN IR3 15mA ≥ IR3 ≤ IF(MAX) VF and IF are forward voltage drop and current of LED1. Figure 8. 1.15V over-voltage indicator ZXRE060 Document number: DS33611 Rev. 2 - 2 8 of 10 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE060 Application Information (Continued) Figure 9. Opto-isolated 0.6V shunt regulator Figure 10. Opto-isolated 1.0V shunt regulator R1 ⎞ ⎛ VOUT = VREF ⎜ 1 + ⎟ R2 ⎠ ⎝ VOUT = VREF V − ( VF + 0.2) R3 = IN IR3 15mA ≥ IR3 ≤ IF(MAX) VF and IF are forward voltage drop and forward current respectively for the optocoupler LED. More applications information is available in the following publications which can be found on Diodes’ web site. AN57 - Designing with Diodes’ References – Shunt Regulation AN58 - Designing with Diodes’ References – Series Regulation AN59 - Designing with Diodes’ References – Fixed Regulators and Opto-Isolation AN60 - Designing with Diodes’ References – Extending the operating voltage range AN61 - Designing with Diodes’ References – Other Applications AN62 - Designing with Diodes’ References – ZXRE060 Low Voltage Regulator ZXRE060 Document number: DS33611 Rev. 2 - 2 9 of 10 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE060 Ordering Information Tol. 0.5% 1% Order Code Part Part Mark ZXRE060AET5TA ZXRE060AH5TA ZXRE060ET5TA ZXRE060H5TA TSOT23-5 SC70-5/SOT353 TSOT23-5 SC70-5/SOT353 S6A S6A S06 S06 Reel Size 7”, 7”, 7”, 7”, 180mm 180mm 180mm 180mm Tape Width Quantity/Reel 8mm 8mm 8mm 8mm 3000 3000 3000 3000 Notes: 4. For packaging details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2010, Diodes Incorporated www.diodes.com ZXRE060 Document number: DS33611 Rev. 2 - 2 10 of 10 www.diodes.com November 2010 © Diodes Incorporated