CS2001 1.2 A Switching Regulator, and 5.0 V, 100 mA Linear Regulator with RESET The CS2001 is a smart power supply ASIC utilized in automotive airbag systems. It contains a current−mode switching regulator with a 1.2 A on−chip switch and a 5.0 V, 100 mA linear regulator. The linear output capacitor must be 3.3 μF or greater with an ESR in the range of 100 mΩ to 1.0 Ω. If the ESR of the cap is less than 100 mΩ, a series resistor must be used. The switcher can be configured in either a boost or flyback topology. The boost topology produces energy reserve the resistor divider connected to the VFB pin. In the event of fault voltage VER which is externally adjustable (25 V maximum) through conditions that produce VFB either open or shorted, the switcher is shut down. Under normal operating conditions (VBAT > 8.0 V), the current loading on the linear regulator is directed through VBAT. A low battery or loss of battery condition switches the supply for the linear regulator from VBAT to VER and shuts down the switcher using the ASIC’s internal smart switch. This switchover feature minimizes the power dissipation in both the linear and switcher output devices and saves the cost of using a larger inductor. The NERD (No Energy Reserve Detected) pin is a dual function output. If VOUT is not in regulation, it provides a Power On Reset function whose time interval is externally adjustable with the capacitor. This interval can be seen on the RESETB pin, which allows for clean power−up and power−down of the microprocessor. Once VOUT is in regulation, the logic level of the NERD output (usually low) indicates to the microprocessor whether or not the VER pin is connected. A switched−capacitor voltage tripler accepts input voltage VER and produces output voltage VCHG (typically VER + 8.0 V). This voltage is used in the system to drive high−side FETs. This part is capable of withstanding a 50 V peak transient voltage. The linear regulator will not shut down during this event. http://onsemi.com SO−20L DWF SUFFIX CASE 751D 20 1 MARKING DIAGRAM 20 CS2001 AWLYYWW 1 A WL YY WW = Assembly Location = Wafer Lot = Year = Work Week PIN CONNECTIONS VER VBAT VFB GND1 GND2 GND3 GND4 VSW SWSD COMP 1 20 VOUT RESETB NERD GND8 GND7 GND6 GND5 VCHG IBIAS CPUMP Features • • • • • • Linear Regulator 5.0 V ±2% @ 100 mA Switching Regulator 1.2 A Peak Internal Switch Voltage Tripler Smart Functions − Smartswitch − RESET − Energy Reserve Status Protection − Overtemperature − Current Limit − 50 V Peak Transient Capability Internally Fused Leads in SO−20L Package © Semiconductor Components Industries, LLC, 2011 May, 2011 − Rev. 6 ORDERING INFORMATION Device 1 Package Shipping CS2001YDWF20 SO−20L 37 Units/Rail CS2001YDWFR20 SO−20L 1000 Tape & Reel Publication Order Number: CS2001/D CS2001 Microprocessor 100 μF 68 μH VOUT RESETB NERD VER VBAT VFB GND1 1.0 k 95.3 k VSW Reserve Firing Voltage VIGN 1000 μF 1000 μF ESR GND2 GND7 CS2001 GND3 GND6 GND4 5.1 k GND8 GND5 VCHG SWSD IBIAS COMP CPUMP 11 k Tripler Firing Voltage 30.1 k 270 pF 1.0 μF 0.1 μF 1.0 μF 0.47 μF 10 μF Figure 1. Application Diagram ABSOLUTE MAXIMUM RATINGS* Rating Value Unit VBAT −0.5 to 25 V VER −0.5 to 25 V VOUT −0.5 to 7.0 V Digital Input/Output Voltage −0.5 to 7.0 V 50 V −55 to 150 °C Junction to Free Air Thermal Impedance 55 °C/W ESD Susceptibility (Human Body Model) 4.0 kV 230 peak °C TA −40 to 85 °C TJ −40 to 150 °C Peak Transient Voltage (36 V Load Dump @ 14 V Battery Voltage) Storage Temperature Range Lead Temperature Soldering: Reflow: (SMD styles only) (Note 1) Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. 60 second maximum above 183°C. *The maximum package power dissipation must be observed. http://onsemi.com 2 CS2001 ELECTRICAL CHARACTERISTICS (8.0 V ≤ VBAT ≤ 16 V, 8.0 V ≤ VER ≤ 25 V, 1.0 mA ≤ IV(OUT) ≤ 100 mA, TTEST = −40°C to 125°C; unless otherwise specified.) Characteristic Test Conditions Min Typ Max Unit 4.9 4.9 − − 5.1 5.1 V V Linear Regulator Output Voltage Output Driven from VBAT, VER = 25 V Output Driven from VER, VBAT = 0 V Regulator Bias Current (from VBAT) IV(BAT) @ IV(OUT) = −100 mA, SWSD = 4.0 V, VBAT = 16 V, VER = 25 V T = −40°C T = 25°C T = 125°C − − − − − − 8.0 7.0 6.0 mA mA mA IVER @ IV(OUT) = −100 mA, SWSD = 4.0 V, VBAT = 0 V, VER = 25 V T = −40°C T = 25°C T = 125°C − − − − − − 11 9.0 8.0 mA mA mA Dropout Voltage VBAT − VOUT VER = 25 V, IV(OUT) = −100 mA (Probe Only) − − 1.5 V Dropout Voltage VER − VOUT VBAT = 0 V, IV(OUT) = −100 mA − − 1.5 V Smart Switch Threshold VBAT to VER VER = 25 V, IV(OUT) = −50 mA 6.5 − 8.0 V Smart Switch Threshold Hysteresis VER = 25 V, IV(OUT) = −50 mA 0.5 − 1.0 V VOUT Output Noise VBAT = 16 V, VER = 25 V, IV(OUT) = − 1.0 mA, C = 10 μF, ESR = 0.5 Ω − − 0.05 V Line Regulation − − − 0.025 V Load Regulation − − − 0.025 V Output Current Limit − 120 − − mA 135 150 165 kHz Regulator Bias Current (from VER) Switching Regulator VER = 25V, IV(OUT) = −1.0 mA Switching Frequency CPUMP 270 pF, RI(BIAS) = 30.1 kΩ Pump Drive Current ΔIV(BAT) for 0 A ≤ IV(SW) ≤ 1.2 A − − 50 mA Switch Saturation Voltage IV(SW) = 1.2 A − − 1.6 V Output Current Limit − 1.2 − 2.4 A VFB Regulation − 1.238 1.27 1.303 V − − 1.0 μA VFB Input Current VFB Above Short Low Detection Level VFB Input Shorted Low Detection Level − 200 250 300 mV CPUMP Short Detection Threshold − 200 250 300 mV Maximum Duty Cycle − 80 − 95 % − − 100 μA VSW Leakage Current Voltage Tripler IV(SW) @ VSW = 50 V, SWSD = VOUT VBAT = 16 V, IV(OUT) = −1.0 mA, CCHG = 1.5 mF Output Voltage Clamp VCHG − VER VER = 8.0 V, IV(CHG) = −30 μA VER = 12 V, IV(CHG) = −90 μA 6.25 6.25 8.0 8.0 13 13 V V Initial Charge Time CCHG = 0.15 μF, VER = 8.0 V, VCHG = 14.25 V − − 30 ms 25 32.5 40 V 25 32.5 40 V − − 3.0 mA Maximum Output Voltage Clamp VCHG Output Voltage Clamp VCHG Short Circuit Path Current Limit VER to VCHG − VER = 28 V, IV(CHG) = 0 μA − http://onsemi.com 3 CS2001 ELECTRICAL CHARACTERISTICS (continued) (8.0 V ≤ VBAT ≤ 16 V, 8.0 V ≤ VER ≤ 25 V, 1.0 mA ≤ IV(OUT) ≤ 100 mA, TTEST = −40°C to 125°C; unless otherwise specified.) Characteristic RESETB OUTPUT Test Conditions Min Typ Max Unit VBAT = 0 V High Threshold VOUT Increasing 4.525 4.75 4.85 V Low Threshold VOUT Decreasing 4.5 4.65 4.825 V 25 100 200 mV Hysteresis − Output Low Voltage VOUT = 1.0 V, IRESETB = 100 μA IRESETB = 1.0 mA, VOUT = 4.5 V − − − − 0.5 0.5 V V Pull−Up Resistor RESETB = 1.0 V 25 50 100 kΩ SWSD Input VBAT = 16 V, VER = 25 V, IV(OUT) = −1.0 mA High Threshold − − − 0.7 × VOUT V Low Threshold − 0.3 × VOUT − − V 10 20 40 kΩ 1.5 − 6.5 V Input Impedance NERD OUTPUT Referenced to Ground VBAT = 16 V, IV(OUT) = −1.0 mA, CNERD = 0.47 mF − VER Detection Voltage Output Low Voltage INERD = 1.0 mA, VOUT = 4.5 V − − 0.5 V Pull−Up Current NERD = 0.5 V 30 40 50 μA 6.25 8.5 11 ms Power On Delay − Clamping Voltage (Low) VER Present 1.0 1.25 1.5 V Clamping Voltage (High) VER Not Present 3.5 3.75 4.0 V − − − − − − 5.0 5.0 4.0 mA mA mA 160 − 210 °C General VER Load Current Thermal Shutdown VER = 25 V, VBAT = 16 V, IV(OUT) = −100 mA T = −40°C T = 25°C T = 125°C (Guaranteed by Design) PACKAGE PIN DESCRIPTION PACKAGE PIN # SO−20L PIN SYMBOL 1 VER Energy reserve input. 2 VBAT Battery input. 3 VFB Charge PUMP control voltage input. 4 GND1 Ground. 5 GND2 Ground. 6 GND3 Ground. 7 GND4 Ground. 8 VSW Charge PUMP switch collector. 9 SWSD Charge PUMP shutdown input. 10 COMP Charge PUMP compensation pin. 11 CPUMP Charge PUMP timing cap input. 12 IBIAS Reference current resistor pin. FUNCTION http://onsemi.com 4 CS2001 PACKAGE PIN DESCRIPTION (continued) PACKAGE PIN # SO−20L PIN SYMBOL 13 VCHG Switched cap voltage tripler output. 14 GND5 Ground. 15 GND6 Ground. 16 GND7 Ground. 17 GND8 Ground. 18 NERD No energy reserve detected output. 19 RESETB 20 VOUT VER FUNCTION Reset output. Linear regulator output. VREF V /C FB PUMP Short 0.25 V − Detect + VFB VCC Switcher Error Amp VCC − + COMP + − Preregulator Base Logic Drive Current VCC Sense Amp + − VCC VREF Bandgap 1.25 V Reference VBAT VREF Over Temperature NERD VSW 1.2 A GND Switcher VCC Shutdown Comp − 0.5 × V CC + Oscillator CPUMP VCHG Switcher V Comp REF VREF IBIAS Voltage Tripler VREF Low Battery − Detect 7.25 V + Linear Error Amp VREF Logic VREF + − SWSD No Battery Drive 100 mA Current Limit VCC VCC RESETB Reset Figure 2. Block Diagram http://onsemi.com 5 VOUT VER Detect CS2001 CIRCUIT DESCRIPTION Figure 3 is an oscilloscope waveform showing the charge pump collector voltage, collector current and the charge pump timing capacitor during normal operation with IVER = 30mA. Figure 4 is an oscilloscope waveform showing the voltage tripler output and the energy reserve input during power up. Figure 4. Startup with RV(CHG) = 510 k Figure 3. Typical Operation with IVER = 30 mA http://onsemi.com 6 CS2001 PACKAGE DIMENSIONS SOIC−20 WB DWF SUFFIX CASE 751D−05 ISSUE G A 20 q X 45 _ E h H M 10X 0.25 NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. 3. DIMENSIONS D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE PROTRUSION SHALL BE 0.13 TOTAL IN EXCESS OF B DIMENSION AT MAXIMUM MATERIAL CONDITION. 11 B M D 1 10 20X B B 0.25 M T A S B S L A 18X e A1 SEATING PLANE C T DIM A A1 B C D E e H h L q MILLIMETERS MIN MAX 2.35 2.65 0.10 0.25 0.35 0.49 0.23 0.32 12.65 12.95 7.40 7.60 1.27 BSC 10.05 10.55 0.25 0.75 0.50 0.90 0_ 7_ PACKAGE THERMAL DATA Parameter SO−20L Unit RΘJC Typical 9 °C/W RΘJA Typical 55 °C/W ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: [email protected] N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5773−3850 http://onsemi.com 7 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative CS2001/D