L6377 0.5 A high-side driver quad intelligent power switch Features ■ Multipower BCD technology ■ 0.5 A output current ■ 8 to 35 V supply voltage range ■ Externally programmable current limit ■ Non-dissipative over-current protection ■ Thermal shutdown ■ Under voltage lockout with hysteresys ■ Diagnostic output for under voltage, over temperature and over current ■ External asynchronous reset input ■ Presettable delay for overcurrent diagnostic ■ Open ground protection ■ Protection against surge transient (IEC 61000-4-5) ■ Immunity against burst transient (IEC 61000-4-4) Figure 1. SO-14 Description This device is a monolithic intelligent power switch in multipower BCD technology for driving inductive, capacitive or resistive loads. Diagnostic for CPU feedback and extensive use of electrical protections make this device inherently indistructible and suitable for general purpose industrial applications. Table 1. Device summary Order codes Package Packaging L6377D SO-14 Tube L6377D013TR SO-14 Tape and reel Block diagram VS GND VS CHARGE PUMP RS IN+ CURRENT LIMIT + - OVC DRIVER 1.3V OUT UV 1.3V DIAG SHORT CIRCUIT CONTROL + R RSC - UV OVT DELAY ON DELAY C DON D94IN075D March 2008 Rev 4 1/16 www.st.com 16 Contents L6377 Contents 1 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Input section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Over temperature protection (OVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Under voltage protection (UV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7 Over current operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 8 Demagnetisation of inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/16 L6377 Maximum rating 1 Maximum rating 1.1 Absolute maximum ratings Table 2. Absolute maximum ratings Symbol Pin Vs 4 Vs - Vout Vod 3 Supply voltage (DC) 40 V internally limited Externally forced voltage -0.3 to 7 V Externally forced current ±1 mA Reset input current (forced) ±2 mA -0.3 to 40 V Output current (see also Isc) internally limited Output voltage internally limited 50 mJ Power dissipation internally limited External voltage -0.3 to 40 V Externally forced current -10 to 10 mA Input current 20 mA Input voltage -10 to Vs +0.3 V 11 Idiag 12 Top Ambient temperature, operating range -25 to 85 °C TJ Junction temperature, operating range (see overtemperature protection) -25 to 125 °C Storage temperature -55 to 150 °C Value Unit 150 °C/W Tstg 1.2 V Total energy inductive load (TJ = 125 °C) Ptot Vi 50 Reset input voltage Eil Ii Supply voltage (tw ≤ 10 ms) 5 Iout Vdiag Unit 10 VRESET Vout Value 4 vs 3 Supply to output differential voltage Iod IRESET Parameter Thermal data Table 3. Symbol RthJA Thermal data Parameter Thermal resistance, junction to ambient (max) 3/16 Pin connections 2 L6377 Pin connections Figure 2. Pin connections (top view) N.C. 1 14 N.C. GND 2 13 RESET OUT 3 12 IN+ VS 4 11 DIAG RSC 5 10 ON DELAY N.C. 6 9 N.C. N.C. 7 8 N.C. D96IN368 Table 4. N# Pin name 1, 6, 7, 8, 9, 14 N.C. Not connected 2 GND Ground pin 3 OUT High side output. Controlled output with current limitation 4 VS 5 Rsc 10 4/16 Pin description Function Supply voltage. Range with under voltage monitoring Current limiting setting ON DELAY Delay setting for overcurrent diagnostic 11 DIAG 12 IN+ 13 RESET Diagnostic open drain output for over temperature, under voltage and overcurrent Comparator non inverting input Asynchronous reset input L6377 3 Electrical characteristics Electrical characteristics Table 5. Electrical characteristcs (Vs = 24 V; TJ = -25 to 125 °C; unless otherwise specified.) Symbol Pin Parameter Test condition Min Typ Max Unit 35 V 35 V 8 V 700 mV DC operation Supply voltage for valid diagnostic Vsmin Vs Vsth 4 Vshys Idiag ≥ 0.5 mA; Vdiag = 1.5 V; 4 Operative supply voltage 8 Under voltage lower threshold 7 Under voltage hysteresis 300 24 500 Iq Quiescent current Output open 800 µA Iqo Quiescent current Output on 1.6 mA Vith Input threshold voltage 0.8 Viths Input threshold hysteresis Input low level voltage Vil 1.3 2 V 50 400 mV -7 0.8 V Vs < 18 V 2 Vs-3 V Vs > 18 V 2 15 V -250 250 µA 2 V 12 Vih Input high level voltage Input bias current Iib Vrth Vi = -7 to 15 V Reset threshold voltage 0.8 Reset low level voltage 0 0.8 V Vrh Reset high level voltage 2 40 V Irb Reset pull down current Vrl Idch Vrsc 13 10 5 Irsc Idlkg Vdiag 1.3 11 5 µA Delay capacitor charging current ON delay pin shorted to Ground 2.5 µA Output voltage on Rsc pin Rsc pin floating 1.25 V Output current on Rsc pin Rsc pin shorted to GND 300 µA Diagnostic output leakage current Diagnostic off 25 µA Diagnostic output voltage drop Idiag = 5 mA; 1.5 V 5/16 Electrical characteristics Table 5. L6377 Electrical characteristcs (continued) (Vs = 24 V; TJ = -25 to 125 °C; unless otherwise specified.) Symbol Pin Parameter Output voltage drop Vdon Test condition Typ Max Unit Iout = 625 mA; TJ = 25 °C 250 350 mV Iout = 625 mA; TJ = 125 °C 400 550 mV 100 µA 0.8 1.5 V 53 58 V Iolk Output leakage current Vi = LOW; Vout = 0 Vol Output low state voltage Vi = HIGH; pin floating Vcl 3 Internal voltage clamp (Vs- Io = 200 mA Vout) single pulsed =300ms Short circuit output current Isc Min 48 Vs = 8 to 35 V; Rl = 2 Ω; Rsc = 5 to 30 KΩ Vs = 8 to 35 V; Rl = 2 Ω; Rsc < 5 KΩ 5/Rsc = KΩ 0.75 1.1 A 1.5 A Tmax Over temperature upper threshold 150 °C Thys Over temperature hysteresis 20 °C 20 µs 5 µs AC operation tr-tf 3 Vs = 24 V; Rl = 70 Ω Rl to ground Delay time td dV/dt tON Rise or fall time 10 Slew rate (rise and fall edge) Vs = 24 V; Rl = 70 Ω Rl to ground On time during short circuit condition 50 pF < CDON< 2 nF 0.7 1 1.5 V/µs 1.28 µs/pF tOFF Off time during short circuit condition 64 tON fmax Maximum operating frequency 25 kHz Source drain NDMOS diode Forward on voltage Ifsd = 625 mA Ifp Forward peak current tp = 10 ms; duty cycle = 20 % trr Reverse recovery time Ifsd = 500 mA; dIfsd/dt = 25 A/µs tfr Forward recovery time Vfsd 6/16 1 1.5 V 1.5 A 200 ns 50 ns L6377 Electrical characteristics Figure 3. Undervoltage comparator hysteresis Vshys Vsth Figure 4. D94IN126A Vs Switching waveforms Vin 50% 50% td t td Vout 90% 90% 50% 50% 10% 10% tr tf D94IN127A t 7/16 Input section 4 L6377 Input section An Input and Asynchronous RESET, both TTL/CMOS compatible with wide voltage range and high noise immunity (thanks to a built in hysteresis) are available. 5 Over temperature protection (OVT) An on-chip Over Temperature Protection provides an excellent protection of the device in extreme conditions. Whenever the temperature - measured on a central portion of the chipexceeds Tmax =150 °C (typical value) the device is shut off, and the DIAG output goes LOW. Normal operation is resumed as the chip temperature (normally after few seconds) falls below Tmax-Thys = 130 °C (typical value). The hysteresis avoid thats an intermittent behaviour take place. 6 Under voltage protection (UV) The supply voltage is expected to range from 8 to 35 V. In this range the device operates correctly. Below 8V the overall system has to be considered not reliable. To avoid any misfunctioning the supply voltage is continuously monitored to provide an under voltage protection. As Vs falls below Vsth-Vshys (typically 7.5 V, see fig. 4) the output power MOS is switched off and DIAG output goes LOW. Normal operation is resumed as soon as Vs exceeds Vsth. The hysteretic behaviour prevents intermittent operation at low supply voltage. 8/16 L6377 7 Over current operation Over current operation In order to implement a short circuit protection the output power MOS is driven in linear mode to limit the output current to the Isc value. This Isc limit is externally settable by means of an external 1/4 W resistor connected from Rsc pin and GND. The value of the resistor must be chosen according to the following formula: Isc (A) = 5/Rsc (kΩ) with 5 < Rsc < 30 (kΩ) For Rsc < 5 (kΩ) Isc is limited to Isc = 1.1 A (typical value). This condition (current limited to the Isc value) lasts for a Ton time interval, that can be set by means of a capacitor (CDON) connected to the ON DELAY pin according to the following formula: tON = 1.28 µs/pF for 50 pF < CDON < 2 nF After the ton interval has expired the output power MOS is switched off for the tOFF time interval with: tOFF = 64*tON. Figure 5. Short circuit operation waveforms OUTPUT CURRENT Isc Iout t<tON DIAG (active low) Short Circuit tON tOFF tON Time tOFF Short Circuit D94IN105 Time 9/16 Over current operation L6377 When also the tOFF interval has expired, the output power MOS is switched ON. Now two conditions may occur ● the overload is still present. In this case the output power MOS is again driven in linear mode (limiting the output current to Isc) for another tON, starting a new cycle, or ● the overload condition is removed, and the output power MOS is no longer driven in linear mode. All these occurrences are presented on the DIAG pin (see fig 5). We call this unique feature non dissipative short circuit protection and it ensures a very safe operation even in permanent overload conditions. Note that, of course, choosing the most appropriate value for the tON interval (i.e. the value of the CDON capacitor) a delay (the tON itself) will prevent that a misleading Short Circuit information is presented on the DIAG output, when driving capacitive loads (that acts like short circuit in the very beginning) or Incandescent Lamp (a cold filament has a very low resistive value). The non dissipative short circuit protection can be disabled (keeping tON = 0 but with the output current still limited to Isc, and Diagnostic disabled) simply shorting to ground the the ON DELAY pin. 10/16 L6377 8 Demagnetisation of inductive loads Demagnetisation of inductive loads The L6377 has an internal clamping zener diode able to demagnetise inductive loads. Note that the limitation comes from the peak power that the package can handle. Attention must be paid to a proper thermal design of the board. If, for whatever reason (load current or inductive value too big) the peak power dissipation is too high, an external Zener plus Diode arrangement, can perform a demagnetisation versus Ground or versus Vs (see fig 5 and 6). The breakdown voltage of the external Zener Diode must be chosen considering the internal clamping voltage (Vcl) and the supply voltage (Vs) according to: Vz < Vcl(min)-Vs(max) for demagnetisation versus ground or Vs(max)<Vz<Vcl(min) for demagnetisation versus Vs. Figure 6. Input comparator hysteresis Vout 100mV 100mV Vs D94IN079 Vi- Figure 7. Vi+ External demagnetisation circuit (versus ground) VS RS CURRENT LIMIT OVC DRIVER OUT UV SHORT CIRCUIT CONTROL VZ < Vcl (min) - VS (max) VZ D94IN112 11/16 Demagnetisation of inductive loads Figure 8. L6377 External demagnetisation circuit (versus ) VS VS RS CURRENT LIMIT VZ OVC DRIVER OUT UV SHORT CIRCUIT CONTROL VS (max) < VZ < Vcl (min) 12/16 D94IN111A L6377 9 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com 13/16 Package mechanical data Table 6. L6377 SO-14 mechanical data mm inch Dim. Min Typ A a1 Max Typ 1.75 0.1 0.25 a2 Max 0.069 0.004 0.009 1.6 0.063 b 0.35 0.46 0.014 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.020 c1 45° (typ.) D (1) 8.55 8.75 0.336 0.344 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 7.62 0.300 F (1) 3.8 4 0.150 0.157 G 4.6 5.3 0.181 0.209 L 0.4 1.27 0.016 0.050 M 0.68 S Figure 9. 14/16 Min 8° (max.) Package dimensions 0.027 L6377 10 Revision history Revision history Table 7. Document revision history Date Revision Changes August 2001 3 First Issue in EDOCS dms 25-Feb-2008 4 Modified: Removed obsolete package DIP-14 15/16 L6377 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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