A Product Line of Diodes Incorporated ZXRE160 0.6V ENHANCED ADJUSTABLE PRECISION SHUNT REGULATOR Description Pin Assignments ZXRE160_H5 (SC70/SOT353) and The ZXRE160 is a 5-terminal adjustable shunt regulator offering excellent temperature stability and output ZXRE160_ET5 (TSOT25) handling capability. This Top view device offers an enhancement to the ZXRE060 part for use in a NEW PRODUCT comparator mode applications. In shunt regulator mode, the ZXRE160 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 the part ideal for state of the art microprocessor, DSP and PLD core voltage POL converters. The device open-collector output can operate from 0.2V to 18V and ZXRE160_FT4 (X2-DFN1520-6) regulated output voltage can be set by selection of two external Top view divider resistors. Separating the input from the open collector output enables the ZXRE160 to be used to make low-cost low drop-out regulators operating at low input voltages. The ZXRE160 is available in two grades with initial tolerances of 0.5% PGND 1 6 IN N/C 2 5 GND OUT 3 4 FB and 1% for the A and standard grades respectively. It is available in space saving low profile 5 pin SC70/SOT353, thin TSOT25 and very small DFN1520 packages. Exposed flag floating or connect to GND Features • Low reference voltage (VFB = 0.6V) • -40°C to +125°C temperature range • Reference voltage tolerance at +25°C Applications • 0.5% ZXRE160A • • Isolated DC-DC converters 1% ZXRE160 • • Core voltage POL Typical temperature drift • • Low Voltage Low-Dropout linear regulators <4 mV (0°C to +70°C) • • Shunt regulators <6 mV (-40°C to +85°C) • • Adjustable voltage reference <12mV (-40°C to +125°C) • 0.2V to 18V open-collector output • High power supply rejection • (>45dB at 300kHz) • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) • Halogen and Antimony Free. “Green” Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. ZXRE160 Document number: DS35688 Rev. 2 - 2 1 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 NEW PRODUCT Typical Applications Circuit Pin Descriptions Pin Name Package Name Pin Number SC70/ SOT353, X2-DFN1520-6 TSOT25 Function PGND 1 1 Power Ground: Ground return for emitter of output transistor: Connect PGND and GND together. — — 2 No connection OUT 5 3 Output: Connect a capacitor close to device between OUT and GND for closed loop stability. See the Applications Information section. FB 4 4 Feedback Input. Threshold voltage 600mV nominal. 5 Analog Ground: Ground return for reference and amplifier: Connect GND and PGND together. GND 2 IN 3 6 — — Flag ZXRE160 Document number: DS35688 Rev. 2 - 2 Supply Input: Connect a 0.1μF ceramic capacitor close to the device from IN to GND. Floating or connect to GND 2 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 NEW PRODUCT Functional Block Diagram The ZXRE160 differs from most other shunt regulators in that it auxiliary rail voltage, or below the minimum VIN voltage. This has separate input and output pins and a low voltage reference. allows it to operate as a low-dropout voltage regulator for This enables it to regulate rails down to 600mV and makes the microprocessor/DSP/PLD cores. part ideal for isolated power supply applications that use As with other shunt regulators (and shunt references), the opto-couplers in the feedback loop and where the open-collector ZXRE160 compares its internal amplifier FB pin to a high output is required to operate down to voltages as low as 200mV. accuracy internal reference; if FB is below the reference then OUT The wide input voltage range of 2V to 18V and output voltage turns off, but if FB is above the reference then OUT sinks current range of 0.2V to 18V enables the ZXRE160 to be powered from – up to a maximum of 15mA. an auxiliary rail, while controlling a master rail which is above the ZXRE160 Document number: DS35688 Rev. 2 - 2 3 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 Absolute Maximum Ratings (Voltages to GND, @TA = +25°C, unless otherwise specified.) Symbol VIN NEW PRODUCT VOUT VFB Parameter Rating Unit IN Voltage relative to GND 20 V OUT Voltage relative to GND 20 V FB Voltage relative to GND 20 V PGND PGND Voltage relative to GND IOUT OUT Pin Current -0.3 to +0.3 V 20 mA TJ Operating Junction Temperature -40 to 150 °C TST Storage Temperature 55 to 150 °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 PDIS Package θJA SC70/SOT353 400°C/W 310mW TSOT25 250°C/W 500mW X2-DFN1520-6 TBD TBD TA = 25°C, TJ = 150°C Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Symbol Parameter Min Max Units VIN IN Voltage Range (0 to +125°C) 2 18 VIN IN Voltage Range (-40°C to 0°C) 2.2 18 VOUT OUT Voltage Range 0.2 18 IOUT OUT Pin Current 0.3 15 mA Operating Ambient Temperature Range -40 +125 °C TA ZXRE160 Document number: DS35688 Rev. 2 - 2 4 of 15 www.diodes.com V June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 Electrical Characteristics (@TA = +25°C, VDD = 3V, unless otherwise specified.) TA = +25°C, VIN = 3.3V, VOUT = VFB, IOUT = 5mA, unless otherwise specified.) (Note 4) NEW PRODUCT Symbol Parameter Conditions TA = 0°C to +85°C VFB Feedback voltage Min Typ Max ZXRE160A 0.597 0.6 0.603 ZXRE160 0.594 0.6 0.606 ZXRE160A 0.595 0.605 ZXRE160 0.592 0.608 ZXRE160A 0.594 0.606 ZXRE160 0.591 0.609 ZXRE160A 0.593 0.607 ZXRE160 0.590 0.610 Units V 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 3.8 IOUT = 1 to 15mA TA = -40 to +125°C VIN = 2V to 18V 0.3 VIN = 2.2V to 18V TA = -40 to +125°C VOUT = 0.2V to 18V, IOUT = 1mA 6 10 1 1.5 mV mV 1 TA = -40 to +125°C (Ref. Figure 1) 1.5 mV -45 IFB FB input bias current VIN = 18V TA = -40 to +125°C -200 0 VFB = 0.7V -50 50 VIN = 2V to 18V 0.35 0.7 IOUT = 0.3mA VIN = 2.2V to 18V IIN Input current nA mA TA = -40 to +125°C VIN = 2V to 18V 1 0.48 1 IOUT = 10mA VIN = 2.2V to 18V TA = -40 to +125°C VIN = 18V, IOUT = 0.3mA VFB = 0.7V 1.5 3 VIN = 18V, IOUT(LK) OUT leakage current VOUT = 18V, VFB =0V mA 0.1 TA = +125°C 1 0.25 IOUT = 1 to 15mA 0.4 µA ZOUT Dynamic Output Impedance PSRR Power supply rejection F = 300kHz ratio VAC = 0.3VPP >45 dB Amplifier Unity Gain Frequency 600 kHz 5000 mA/V BW TA = -40 to +125°C Ref: Figure 2 Amplifier Transconductance G Note: f < 1kHz 0.6 Ω 4. 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, characterization and process control. ZXRE160 Document number: DS35688 Rev. 2 - 2 5 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 NEW PRODUCT Typical Characteristics ZXRE160 Document number: DS35688 Rev. 2 - 2 6 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 Typical Operating Characteristics 200 225 200 225 150 180 100 135 100 135 50 90 50 90 0 45 Gain (dB) 180 Phase (deg) Gain (dB) NEW PRODUCT 150 0 45 Gain Gain Phas e Phase -50 0 1 10 Phase (deg) V OUT = 6V COUT = 0.22uF V OUT = 0.6V COUT = 2.2uF 100 1k 10k 100k 1M -50 0 1 10 100 1k 10k 100k 1M Frequency (Hz) Frequency (Hz) Gain and Phase vs Frequency, VOUT=0.6V Gain and Phase vs Frequency, V OUT=6V Figure 2. Test Circuits for Gain and Phase Plots ZXRE160 Document number: DS35688 Rev. 2 - 2 7 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 Application Information The following show some typical application examples for the ZXRE160. Figure 3 shows a typical configuration for the ZXRE160 in comparator mode. NEW PRODUCT Here the comparator switches low when: VM ≥ VFB (R1 + R 2 ) R2 Alternative values of R1, R2 may be used to provide different threshold voltages. R3 can also be adjusted to set the bias current for different values of VM. R2 should be kept as low as possible to minimize errors due to the bias current of the FB pin. This circuit has no hysteresis, so a small capacitor of approx.4.7nF between FB and GND is recommended to provide cleaner transitions at the output. Figure 3. 15V Supply Monitor In shunt regulator mode it is necessary to include the compensation capacitor C2 to guarantee stability. C2 may range in value from 0.1µF to 10µF depending on the application. The minimum value of C2 can be determined from the following equation (resistor values are in kΩ): C2MIN ≥ R2 μF R 3 (R1 + R 2 ) Both C1 and C2 should be as close to the ZXRE160 as possible and connected to it with the shortest possible track. In the case of Figure 10 and Figure 11, it means the opto-coupler will have to be carefully positioned to enable this. R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ ⎝ R2 ⎠ VOUT = VREF R3 = VIN − VOUT IR3 R3 = Figure 4. 0.6V Shunt Regulator ZXRE160 Document number: DS35688 Rev. 2 - 2 VIN − VOUT IR3 Figure 5. 1.0V Shunt Regulator 8 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 NEW PRODUCT Application Information (cont.) R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ ⎝ R2 ⎠ VOUT = VREF Figure 6. 0.6V Series LDO Regulator Figure 7. 1.0V Series LDO Regulator Design guide: 1. Determine IOUT and choose a suitable transistor taking power dissipation into consideration. 2. Determine IB from IB = 3. Determine IR3 from IR3 ≥ IB + IKA(min) . The design of the ZXRE160 effectively means there is no IKA(min) limitation as in conventional IOUT(max) (hFE(min) + 1) 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. 4. Determine R3 from R3 = VIN − ( VOUT + VBE ) . IR3 Although unlikely to be a problem, ensure that IR3 ≤ 15 mA. ZXRE160 Document number: DS35688 Rev. 2 - 2 9 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 Application Information (cont.) NEW PRODUCT R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ ⎝ R2 ⎠ VOUT ≥ 0.2V + VBE R3 = VIN − VOUT IR3 Figure 8. 1V Current-Boosted Shunt Regulator Design guide 1. Determine IOUT and choose a suitable transistor taking power dissipation into consideration. 2. Determine IB from I = IOUT(max) B 3. Determine IR3 from IR3 = IOUT(max) 4. Determine R3 from R3 = 5. It is best to let the ZXRE160 supply as much current as it can before bringing Q1 into conduction. Not only does this minimize the strain on Q1, it also guarantees the most stable operation. Choose a nominal value between 10mA and <15mA for this current, IR4. (hFE(min) + 1) Calculate R4 from R4 = VIN − VOUT IR3 VBE 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 9. 1.15V Over-Voltage Indicator ZXRE160 Document number: DS35688 Rev. 2 - 2 10 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 NEW PRODUCT Application Information (cont.) R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ R2 ⎠ ⎝ VOUT = VREF R3 = VIN − ( VF + 0.2) IR3 R3 = 15mA ≥ IR3 ≤ IF(MAX) VIN − ( VF + 0.2) IR3 15mA ≥ IR3 ≤ IF(MAX) Figure 11. Opto-Isolated 1.0V Shunt Regulator Figure 10. Opto-Isolated 0.6V Shunt Regulator 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. AN58 - Designing with Diodes’ References – Shunt Regulation AN59 - Designing with Diodes’ References – Series Regulation AN60 - Designing with Diodes’ References – Fixed Regulators and Opto-Isolation AN61 - Designing with Diodes’ References – Extending the operating voltage range AN62 - Designing with Diodes’ References – Other Applications AN63 - Designing with Diodes’ References – ZXRE060 Low Voltage Regulator ZXRE160 Document number: DS35688 Rev. 2 - 2 11 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 NEW PRODUCT Ordering Information Tol. 0.5% 1% Part Number Package Identification Code Reel Size Tape Width Quantity/Reel ZXRE160AET5TA TSOT25 R8 7”, 180mm 8mm 3000 ZXRE160AH5TA SC70/SOT353 R9 7”, 180mm 8mm 3000 ZXRE160AFT4-7 DFN1520H4-6 R8 7”, 180mm 8mm 3000 ZXRE160ET5TA TSOT25 Z8 7”, 180mm 8mm 3000 ZXRE160H5TA SC70/SOT353 Z9 7”, 180mm 8mm 3000 ZXRE160FT4-7 X2-DFN1520-6 Z8 7”, 180mm 8mm 3000 Marking Information 1. TSOT25, SC70/SOT353 2. X2-DFN1520-6 ZXRE160 Document number: DS35688 Rev. 2 - 2 12 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 Package Outline Dimensions (All dimensions in mm.) TSOT25 D NEW PRODUCT e1 E E1 L2 c 4x θ1 e L θ 5x b A A2 A1 TSOT25 Dim Min Max Typ A 1.00 − − A1 0.01 0.10 − A2 0.84 0.90 − D 2.90 − − E 2.80 − − E1 1.60 − − b 0.30 0.45 − c 0.12 0.20 − e 0.95 − − e1 1.90 − − L 0.30 0.50 L2 0.25 − − θ 0° 8° 4° θ1 4° 12° − All Dimensions in mm SC70/SOT353 A SOT353 Dim Min Max A 0.10 0.30 B 1.15 1.35 C 2.00 2.20 D 0.65 Typ F 0.40 0.45 H 1.80 2.20 J 0 0.10 K 0.90 1.00 L 0.25 0.40 M 0.10 0.22 0° 8° α All Dimensions in mm B C H K J M D L F X2-DFN1520-6 A3 A SEATING PLANE A1 D X2-DFN1520-6 Dim Min Max Typ A 0.40 − − A1 0 0.05 − A3 0.13 − − b 0.20 0.30 − D 1.45 1.575 − D2 1.00 1.20 − e 0.50 − − E 1.95 2.075 − E2 0.70 0.90 − L 0.25 0.35 − All Dimensions in mm e L E2 E D2 b ZXRE160 Document number: DS35688 Rev. 2 - 2 13 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 Suggested Pad Layout TSOT25 NEW PRODUCT C C Dimensions Value (in mm) C 0.950 X 0.700 Y 1.000 Y1 3.199 Y1 Y (5x) X (5x) SC70/SOT353 C2 Z C2 C1 G Y Dimensions Value (in mm) Z 2.5 G 1.3 X 0.42 Y 0.6 C1 1.9 C2 0.65 X X2-DFN1520-6 C1 C G2 G1 X1 Dimensions Z G1 G2 X1 C C1 Value (in mm) 1.25 0.45 0.15 1.10 0.50 0.25 G2 Z ZXRE160 Document number: DS35688 Rev. 2 - 2 14 of 15 www.diodes.com June 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXRE160 IMPORTANT NOTICE NEW PRODUCT 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). 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