100V Linear Bias Supply ISL6719 Features The ISL6719 is a low cost linear regulator for generating a low voltage bias supply from intermediate distributed voltages commonly used in telecom and datacom applications. It provides a single adjustable output rated at 100mA from either the input source or an auxiliary source such as a transformer winding. The auxiliary source is selected whenever it has sufficient voltage to sustain the output. • 100V+ input capability The ISL6719 may be used as a start-up or a continuous low power regulator. When operating as a start-up regulator, it is capable of sourcing 100mA from a 100V source for short durations. This period of time allows the power supply to start-up and provide an alternate power source, such as the output of a transformer winding, to the AUXIN input. This allows the regulated output to operate from a lower source voltage to minimize power loss. Pin Configuration • Adjustable output from 1.5V to 20V • Up to 100mA output current • Overcurrent protection • Over-temperature protection • ENABLE and ENABLE_N inputs • Package compliant with IPC2221A, creepage and clearance spacing requirements Applications • Telecom/datacom DC/DC converters • Low power bias supplies ISL6719 (9 LD DFN) TOP VIEW VPWR 1 9 GND 8 ENABLE_N AUXIN 2 7 ENABLE VSW 3 6 COMPB VSW_FB 4 5 COMPA Ordering Information PART NUMBER (Note 1, 2, 3) ISL6719ARZ PART MARKING TEMP RANGE (°C) 19AZ -40 to +105 PACKAGE (Pb-free) 9 Ld DFN PKG. DWG. # L9.3x3 NOTES: 1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL6719. For more information on MSL, please see tech brief TB363. July 15, 2014 FN6555.2 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2007, 2014. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. Submit Document Feedback Functional Block Diagram 0V TO 40V VPWR AUXIN 105V MAX 2 INPUT SELECTOR 1.5V TO 20V @ 100mA VSW REGULATOR START/STOP UV COMPARATOR + - GND INT. BIAS INT. BIAS ENABLE + _ 1.5V REF VSW_FB TEMP OK COMPA TMON +150ºC TRIP +95ºC CLEAR COMPB INT. BIAS ENABLE INT-ENABLE ENABLE_N POR - + - + BG ISL6719 BG +- VPWR OK VSW FN6555.2 July 15, 2014 Submit Document Feedback Typical Application CONVERTER POWER STAGE +VOUT VIN+ 3 17V TO 100V VIN- RETURN ENABLE DISABLE GND 9 ENABLE_N 8 AUXIN 2 PWM ENABLE 7 3 VSW COMPB 6 4 R1 COMPA VSW_FB ISL6719 C1 C2 1.0F R2 5 C3 220pF FEEDBACK AMPLIFIER ISL6719 1 VPWR FN6555.2 July 15, 2014 ISL6719 Absolute Maximum Ratings Thermal Information Supply Voltage, VPWR . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 105V AUXIN, VSW_FB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 40V COMPB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 30V VSW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 25V All Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 6.0V Thermal Resistance (Typical) JA (°C/W) JC (°C/W) 9 Ld DFN (Notes 4, 5). . . . . . . . . . . . . . . . . . 54 2.8 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . -55°C to +150°C Maximum Storage Temperature Range . . . . . . . . . . . . . -65°C to +150°C Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp Operating Conditions Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +105°C Supply Voltage Range (Typical). . . . . . . . . . . . . . . . . . . . . 18VDC to 80VDC CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. NOTES: 4. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside. 6. All voltages are with respect to GND. Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” on page 2 and “Typical Application” on page 3. 17V < VPWR < 100V, CVSW = 1µF, IVSW = -3mA, VSW Enabled, TA = -40°C to +105°C (Note 7), Typical values are at TA = +25°C. PARAMETER TEST CONDITIONS MIN (Note 8) TYP MAX (Note 8) UNITS 100 V SUPPLY VOLTAGE (VPWR) Supply Voltage Start-Up Current (IVPWR) VPWR = 12V 250 450 µA Operating Current (IVPWR) VSW Enabled, VPWR = 100V, VSW = 10V, 20V, IVPWR - IVSW 1.1 2.0 mA VSW Disabled, VPWR = 100V, 1.1 2.0 mA AUXIN Biased at 40V, VSW Enabled, VPWR = 100V, VSW = 10V, 20V, IVSW = -100mA 1.1 2.0 mA UVLO START Threshold VSW Disabled 13.0 16.5 V UVLO STOP Threshold VSW Disabled 12.0 15.0 V Hysteresis UVLO START - UVLO STOP 1.7 V 40 V 1.5 µF +5 % 0.8 1.2 AUXILIARY VOLTAGE (AUXIN) Maximum Bias VPWR = 17V, 100V OUTPUT VOLTAGE (VSW) Load Capacitance Range (Note 9) Overall Accuracy VPWR = 18V, 100V, VSW = 5V, 10V, 12V AUXIN = 15V, IVSW = -3mA to -100mA Setpoint Range VPWR = 100V, AUXIN = 30V 1.55 Reference VSW_FB = VSW 1.45 Source Voltage Headroom (AUXIN - VSW) VPWR = 17V, VSW = 10V, IAUXIN = 0.95*IVSW Submit Document Feedback 4 0.47 1.0 -5 20 V 1.50 1.55 V IVSW = -100mA 1.8 3.0 V IVSW = -50mA 1.4 2.0 V FN6555.2 July 15, 2014 ISL6719 Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” on page 2 and “Typical Application” on page 3. 17V < VPWR < 100V, CVSW = 1µF, IVSW = -3mA, VSW Enabled, TA = -40°C to +105°C (Note 7), Typical values are at TA = +25°C. (Continued) MAX (Note 8) UNITS IVSW = -100mA 6.2 V IVSW = -50mA 5.2 V -3 mA 25 V PARAMETER TEST CONDITIONS Source Voltage Headroom (VPWR - VSW) MIN (Note 8) TYP VSW = 20V, AUXIN = 0V Minimum Required Load Maximum VOUT, Faulted VSW_FB VSW_FB = 0V, VPWR = 100V, AUXIN = 40V 21 Long Term Stability TA = +125°C, 1000 hours (Note 8), VPWR = 48V, VSW = 10V, IVSW = -10mA, AUXIN = 15V Operational Current (source) VPWR = 48V, AUXIN = 17V, VSW = 15V -100 Current Limit VPWR = 48V, AUXIN = 15V, VSW = 10V -100 VSW_FB Bias Current VPWR = 100V, AUXIN = 40V, VSW = 10V, VSW_FB = 1.5V -0.5 COMPA, COMPB Recommended Capacitance (Note 9) 170 0.3 % mA -230 220 -400 mA 1.5 µA 270 pF COMPA Voltage 0.7 V COMPB Voltage VSW + 5.0 V ENABLE, ENABLE_N High Level Input Voltage (VIH) VPWR = 48V, AUXIN = 0V 2.5 3.0 3.6 V Low Level Input Voltage (VIL) VPWR = 48V, AUXIN = 0V 1.6 2.0 2.5 V Hysteresis VPWR = 48V, AUXIN = 0V 0.7 1.0 1.3 V Pull-Up Resistance VENABLE = VN_ENABL = 0V - 100 - kΩ Turn-On Delay TVSW, 10% - TENABLE, T VSW,10% - TENABLE_N, IVSW = -3mA 25 µs Turn-Off Delay TVSW, 10% - TENABLE, T VSW,10% - TENABLE_N, IVSW = -50mA 40 µs 150 °C Thermal Shutdown Clear 95 °C Hysteresis 55 °C THERMAL PROTECTION Thermal Shutdown NOTE: 7. Specifications at -40°C and +105°C are guaranteed by +25°C test with margin limits. 8. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are not production tested. 9. Limits established by characterization and are not production tested. Submit Document Feedback 5 FN6555.2 July 15, 2014 ISL6719 Typical Performance Curves 5.5 2.5 AUXIN - VSW (V) VPWR - VSW (V) 5.0 4.5 4.0 2.0 1.5 3.5 3.0 0 20 40 60 80 1.0 100 0 20 VSW CURRENT (mA) FIGURE 1. VPWR - VSW vs IVSW @ AUXIN = 0V, +25°C 80 100 1.0010 NORMALIZED OUTPUT VOLTAGE NORMALIZED REGULATION 60 FIGURE 2. AUXIN - VSW vs IVSW @ VPWR = 17V, +25°C 1.002 VSW = 20V, AUXIN = 30V 1.001 VSW = 1.5V, AUXIN = 15V VSW = 5V, AUXIN = 15V 1.000 0.999 VSW = 12V, AUXIN = 15V 0.998 VSW = 15V, AUXIN = 30V 0.997 -40 40 VSW CURRENT (mA) -25 -10 5 20 35 50 65 80 95 110 VSW = 5V 1.0005 VSW = 10V 1.0000 VSW = 12V 0.9995 0.9990 0 TEMPERATURE (°C) FIGURE 3. VSW REGULATION vs TEMPERATURE @ VPWR = 100V, IVSW = 3mA Pin Descriptions VPWR VPWR is the power connection for the IC. UVLO enables/disables the output and places the device into a standby mode even if AUXIN is externally biased. To optimize noise immunity, bypass VPWR to GND with a ceramic capacitor as close to the VPWR and GND pins as possible. AUXIN This is the input for an external bias source typically provided by an auxiliary transformer winding. This input is not required and may be grounded or left open. Maximum input bias is 40V. ENABLE The positive logic on/off control input. A logic high enables VSW. Asserting this signal low turns off VSW. ENABLE and ENABLE_N are logically ORed. Either signal can enable VSW, but both must be false to disable VSW. Submit Document Feedback 6 10 20 30 40 50 60 70 80 90 100 LOAD (mA) FIGURE 4. VSW REGULATION vs LOAD @ VPWR = 18V, AUXIN = 15V, +25°C ENABLE_N The negative logic on/off control input. A logic low enables VSW. Asserting this signal high turns off VSW. ENABLE and ENABLE_N are logically ORed. Either signal can enable VSW, but both must be false to disable VSW. GND Signal and power ground connections for this device. VSW This is the switched regulated low voltage output supply that is derived from VPWR or AUXIN. Its output is adjustable from 1.5V to 20V using an appropriate divider from VSW to VSW_FB. Protection circuitry prevents the output from exceeding 25V in the event of a fault on VSW_FB (short high or low). The minimum output current capability is 100mA. VSW requires a minimum load of 3mA. VSW_FB The feedback pin for VSW. A divider from VSW to ground sets feedback for VSW and determines the output voltage. FN6555.2 July 15, 2014 ISL6719 COMPA, COMPB A compensating capacitor is placed between COMPA and COMPB to stabilize the control loop. The values may vary depending on the output load and capacitance applied between VSW and GND, but for all applications having a 1.0µF load capacitor, a 220pF compensation capacitor is recommended. The voltage at COMPA is nominally 0.7V. The voltage at COMPB is nominally VSW +5.0V. Functional Description Features The output voltage is adjusted using the VSW_FB input. The VSW is set with a resistor divider from VSW to ground with the central node connected to VSW_FB. Refer to Figure 5. Referring to Equation 1, the VREF is nominally 1.5V and IBIAS has a maximum value of 1.5µA. The error introduced by the VSW_FB bias current can be minimized by making the product of R1 x IBIAS small, relative to the magnitude of the desired output voltage. For example, setting R1 x IBIAS equal to 0.5% of VSW yields a value for R1 equal to 3.33 x VSW (k). R1 + R2 VSW = V REF --------------------- – I BIAS R 1 R (EQ. 1) V 2 The control circuitry used in Telecom/Datacom DC/DC converters typically requires an operating bias voltage significantly lower than the source voltage available to the converter. Many applications use a discrete linear regulator from the input source to create the bias supply. Often an auxiliary winding from the power transformer is used to supplement or replace the linear supply once the converter is operating. The auxiliary winding bias voltage may require regulation as well to minimize the voltage variation inherent in slave windings. When implemented discretely, this circuitry occupies significant PWB area, a considerable problem in today’s high density converters. The ISL6719 linear regulator simplifies the start-up and operating bias circuitry needed in Telecom and Datacom DC/DC converters by integrating these functions, and more, in a small 3mm x 3mm DFN package. The VSW requires an external compensation capacitor to remain stable across the output adjustment range, output capacitance and loading. A value of 220pF between COMPA and COMPB is recommended for all operating conditions with a nominal load capacitance of 1.0µF (0.47µF to 1.5µF). The VSW requires a minimum load of 3mA. 1 VPWR GND 9 ENABLE_N 8 VSW AUXIN 2 ENABLE 7 AUXIN 3 6 VSW COMPB 4 COMPA 5 VSW_FB R1 AUXIN is the auxiliary input of the ISL6719, accepting bias voltage whenever the input source voltage, VPWR, is above its undervoltage lockout (UVLO) threshold. The VSW selects AUXIN as its source when it is capable supporting the load on VSW. Otherwise VPWR is selected. AUXIN can accept voltages up to 40V maximum. Voltages in excess of 40V, including transients, will cause permanent damage to the device. Care should be taken when connecting external sources through very long traces or lead wires. The lead inductance may cause unexpected transients in excess of the device’s ratings. In such circumstances it is recommended that a small resistor be placed between AUXIN and the external source to dampen the transient. A value of 10 to 100 is usually sufficient. C2 1.0F R2 C3 220pF FIGURE 5. VSW ADJUSTMENT AND COMPENSATION VSW The VSW is the switched output and may be turned on and off using the ENABLE or ENABLE_N pins. The VSW is adjustable from 1.5V to 20V, but must always be at least 6.2V lower than VPWR at rated load. Additionally, VSW must be at least 3.0V lower than AUXIN for it to function as the source for VSW. As the differential voltage between AUXIN and VSW drops below 3.0V, the input current will shift from AUXIN to VPWR. The voltage headroom required is load dependent (see Figures 1 and 2). The VSW preferentially uses AUXIN as its input source, but if AUXIN is unable to supply adequate voltage, VPWR is selected as the alternate input source. The VSW is capable of delivering up to 100mA continuously, depending on power dissipation and the thermal environment in which the device is placed. Submit Document Feedback 7 FN6555.2 July 15, 2014 ISL6719 ENABLE, ENABLE_N The ENABLE and ENABLE_N are complementary inputs used to turn VSW on and off. Both polarities of the enable function are provided to ease the interface to the application. The VSW may be enabled by either ENABLE or ENABLE_N, but both inputs must be logically false to disable the output. Each enable input has a nominal 100k pull-up resistor to 5V. TRACE 1: VSW TABLE 1. ENABLE, ENABLE_N TRUTH TABLE INPUTS TRACE 2: IVSW FIGURE 6. VSW TRANSIENT RESPONSE, 10mA TO 100mA STEP, VPWR = 18V, AUXIN = 15V, VSW = 12V Figure 6 depicts the transient response of VSW during a 10mA to 100mA step load when AUXIN is set to 15V and VPWR is set to 18V. VPWR VPWR provides the source voltage for the IC and load until AUXIN is back biased. VSW is disabled and the IC operates in a standby (low power consumption) mode when UVLO is active. If the application requires high currents or longer start-up times than the thermal protection allows, the device dissipation may be reduced by adding a resistor or resistors in series between the input voltage and VPWR. The dropping resistance must be selected such that VPWR remains above the UVLO threshold of VPWR and at least 6.2V greater than VSW under maximum load and minimum input voltage to maintain regulation. OUTPUT ENABLE ENABLE_N VSW 0 0 ON 0 1 OFF 1 0 ON 1 1 ON The inputs can accept voltages up to 6V maximum down to 0.3V below signal ground. Voltages beyond these limits, including transients, may cause permanent damage to the device. Care should be taken when connecting signal sources through long connections or if significant ground shift could occur between the source and the input. In such circumstances, it is recommended that appropriate clamping networks be used to prevent possible electrical overstress. Over-Temperature Protection The ISL6719 has an over-temperature shutdown mechanism to protect the device from excessive dissipation. The VSW shutdown occurs approximately at +150°C. The hysteresis is large so that the IC has sufficient time to operate at start-up loading levels without re-triggering the over-temperature protection. VIN 1 VPWR GND 9 ENABLE 8 _N 2 AUXIN ENABLE 7 3 VSW COMPB 6 COMPA 5 4 VSW_FB FIGURE 7. ADDING DROPPING RESISTORS TO VPWR Submit Document Feedback 8 FN6555.2 July 15, 2014 ISL6719 Dual Flat No-Lead Plastic Package (DFN) L9.3x3 2X 9 LEAD DUAL FLAT NO-LEAD PLASTIC PACKAGE 0.15 C A A D MILLIMETERS 2X 0.15 C B E SYMBOL MIN 0.80 0.90 1.00 - - - 0.05 - 0.20 REF 0.20 D D2 B A C SEATING PLANE 1 6 0.30 4, 7 2.10 6, 7 - 3.00 BSC 0.80 e 0.08 C 2.00 0.95 6, 7 1.05 0.50 BSC - k 0.60 - - L 0.25 0.35 0.45 N D2 7 9 2 Rev. 0 3/06 7 NOTES: D2/2 1. Dimensioning and tolerancing conform to ASME Y14.5-1994. 2 2. N is the number of terminals. 3. All dimensions are in millimeters. Angles are in degrees. NX k 4. Dimension b applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. E2 5. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 identifier may be either a mold or mark feature. (DATUM A) E2/2 NX L N 6. Dimensions D2 and E2 are for the exposed pads which provide improved electrical and thermal performance. N-1 NX b 7 E2 A3 SIDE VIEW (DATUM B) 5 INDEX AREA 0.10 C 0.25 - 3.00 BSC 1.85 E // NOTES A b TOP VIEW MAX A1 A3 5 INDEX AREA NOMINAL e (Nd-1)Xe REF. BOTTOM VIEW 4 0.10 M C A B 7. Nominal dimensions are provided to assist with PCB Land Pattern Design efforts, see Intersil Technical Brief TB389. 8. COMPLIANT TO JEDEC MO-229-WEED-3 except for dimensions E2 & D2. CL NX (b) (A1) 8 L 4 e SECTION "C-C" C C TERMINAL TIP FOR ODD TERMINAL/SIDE For additional products, see www.intersil.com/en/products.html Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted in the quality certifications found at www.intersil.com/en/support/qualandreliability.html Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com Submit Document Feedback 9 FN6555.2 July 15, 2014