LT1089 High Side Switch U FEATURES ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LT®1089 is a logic driven, high current, high side switch utilizing bipolar technology. The device is capable of driving loads up to 7.5A with a low series drop of only 1.5V, and the series drop is specified over the full range of switch currents. The device has internal current limiting and thermal overload protection. The input logic is designed so that the output can drive loads referenced either above or below the device ground pin. Either positive or negative logic can be used to drive the input. The device is available in both TO-3 metal can and TO-220 plastic packages. 7.5A Switch Capability Low Series Drop (< 1.5V at 7.5A) Logic Input (Positive or Negative Logic) Current Limited Thermal Overload 5mA Quiescent Current 10µs Risetime , LTC and LT are registered trademarks of Linear Technology Corporation. W BLOCK DIAGRA LT1089 Switch Voltage vs Output Current VCC 2 BIAS, THERMAL LIMIT, CURRENT LIMIT, OUTPUT DRIVE LOGIC IN IQ ≈ 5mA VOUT SWITCH FORWARD DROP (V) INDICATES GUARANTEED TEST POINT – 55°C ≤ TJ ≤ 150°C 0°C ≤ TJ ≤ 125°C 1 TJ = 150°C TJ = 25°C TJ = – 55°C 0 LOGIC GND LT1089 • BD01 0 1 2 3 4 5 6 7 8 SWITCH CURRENT (A) 9 10 LT1089 • BD02 1089fa 1 LT1089 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO (Note 1) Switch Voltage (VCC – VOUT) .................................. 30V Logic Input Voltage (VIN – GND) ............................ 15V Logic Input Voltage Range (VlN) .. (VCC – 30V) < VIN < VCC Ground Pin Voltage Range (GND) .. (VCC – 30V) < GND < VCC Operating Junction Temperature Range LT1089M Grades ................................ –55°C to 150°C LT1089C Grades ...................................... 0°C to 125°C Storage Temperature Range ................. –65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C U W W W AXI U OPERATING SPECIFICATIONS* U Switch Voltage (VCC – VOUT) ................................. 20V Logic Input Voltage (VIN – GND) .............................. 5V Logic Input Voltage Range (VlN) ......(VCC – 20V) < VIN < VCC Ground Pin Voltage Range (GND)....(VCC – 20V) < GND < VCC ORDER PART NUMBER BOTTOM VIEW VIN NC 1 CASE IS VOUT 2 3 4 LOGIC IN GND K PACKAGE 4-LEAD TO-3 METAL CAN OBSOLETE PACKAGE Consider the T Package as an Alternate Source ORDER PART NUMBER FRONT VIEW 5 LOGIC IN 4 3 1 LT1089CT VIN VOUT 2 *Maximum operating specifications are the maximum recommended operating voltages. The device is fully specified up to the maximum operating specifications. For voltages greater than the maximum operating specifications some device parameters may exceed the data sheet limits. LT1089MK LT1089CK GND NC T PACKAGE 5-LEAD TO-220 LT1089 • POI01 Consult LTC Marketing for parts specified with wider operating temperature ranges. 1089fa 2 LT1089 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over full operating temperature range. (Note 1) PARAMETER CONDITIONS (NOTE 2) Output Saturation Voltage ISWITCH = 7.5A, (VIN – GND) = 5V, 4V (VCC – GND) < 20V Input Voltage (VIN – GND) Switch ON, (Note 3) 4V < (VCC – GND) < 20V ● Switch OFF, (Note 4) 4V < (VCC – GND) < 20V ● Input Current MIN ● TYP MAX 1.3 1.5 1.5 1.5 0.8 – 20 – 100 ● Switch OFF, (VIN – GND) = 0V 0 ● Ground Pin Current ±5 Switch ON, (VIN – GND) = 5V 3.5 Switch OFF, (VIN – GND) = 0V ● Current Limit Switch ON, (VIN – GND) = 5V (VCC – VOUT) = 5V (VCC – VOUT) = 20V ● ● Turn-On Delay 8.0 0.5 5 10 mA 9.5 1.0 12.0 1.5 A A 10 µs µs 20 µs µs 25 µs µs 25 µs µs 1.6 2.0 °C/ W °C/ W 1 ● Turn-Off Delay 5 ● Output Risetime RLOAD = 4Ω 10 ● Output Falltime RLOAD = 4Ω (Note 5) 10 ● Thermal Resistance K Package T Package Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Unless otherwise specified, (VCC – GND) = 20V and the output load is referred to the ground pin (GND) of the device. Positive current values are defined to flow out of the device. µA µA µA µA ±20 0 ● Output Current V V mA mA µA µA 5.0 ● Switch OFF, (VIN – GND) = 0V V V V 2.4 Switch ON, (VIN – GND) = 5V UNITS Note 3: For input voltages greater than 2.4V the device Is guaranteed to be turned on. 1.5V is the typical threshold at 25°C. Note 4: For input voltages less than 0.8V, the device is guaranteed to be in an off state. 1.5V is the typical switch threshold at 25°C. Note 5: For reactive loads such as large capacitors, the output falltime will be determined by the load. 1089fa 3 LT1089 U W TYPICAL PERFOR A CE CHARACTERISTICS Minimum Output Current Short-Circuit Current 12 (LOGIC IN – GND) = 0V SWITCH OFF 9 SHORT-CIRCUIT CURRENT (A) MINIMUM OUTPUT CURRENT (mA) 10 8 7 6 5 TJ = 150°C 4 TJ = 25°C 3 2 1 10 25°C 150°C 8 6 –55°C 4 2 TJ = – 55°C 0 0 0 5 20 15 10 25 SWITCH VOLTAGE (V) 30 0 35 20 30 15 25 5 10 SWITCH VOLTAGE (VCC – VOUT) (V) LTC1089 • TPC02 LTC1089 • TPC01 Input Trip Voltage (Logic In – GND) Ground Pin Current 15 3.0 TJ = –55°C GROUND PIN CURRENT (mA) INPUT TRIP POINT (V) 2.5 2.0 1.5 1.0 0.5 0 25 50 75 100 125 150 – 50 – 25 0 JUNCTION TEMPERATURE (°C) TJ = 25°C 10 TJ = 125°C 5 0 0 5 10 INPUT VOLTAGE (LOGIC IN – GND) (V) 15 LTC1089 • TPC04 LTC1089 • TPC03 Rise and Fall Times Logic Input Current 18 150 RL = 2Ω 16 V OUT = 10V 14 VCC = 20V OUTPUT VOLTAGE (V) TJ = – 55°C INPUT CURRENT (µA) 35 100 TJ = 25°C 50 12 10 8 6 4 2 TJ = 125°C 0 0 –2 0 5 10 INPUT VOLTAGE (LOGIC IN – GND) (V) 15 LTC1089 • TPC05 0 10 20 30 40 50 60 70 80 90 100 TIME (µs) LTC1089 • TPC06 1089fa 4 LT1089 U TYPICAL APPLICATIO S Driving Ground Referred Loads Driving Negative Referred Loads LOGIC IN Driving Inductive Loads 12V 12V VOUT LT1089 LOGIC IN 12V 20V VOUT LT1089 LOGIC IN LT1089 VOUT –5V LT1089 • TA01 LT1089 • TA02 LT1089 • TA03 U U APPLICATIO HI TS The logic and ground pins function as a differential logic input with a common-mode range of VCC to VCC – 20V and a differential threshold voltage (VLOGIC – GND) of 1.5V. Note that if either Logic In or GND are left open the switch remains inactive. The LT1089 must be protected against overvoltage at turn-off when driving inductive loads. The inductive flyback voltage can easily exceed the maximum operating switch voltage (VCC – VOUT) of 20V, potentially damaging the switch. The solution is to clamp the switch voltage to 20V or less with a zener diode. Remember that the switch can handle 7.5A and the Zener may be required to handle the same amount of current. Care must be exercised when operating near the maximum switch voltage. A high current or capacitive load may trip the current limit circuit at turn-on, thereby adversely affecting the risetime of VOUT. The risetime is then governed by the current limit divided by the load capacitance, while the falltime is a function of the complex load. In addition, at switch voltages greater than 18V the switch current must be less than 0.5A or the device output will not pull up. Check the short circuit current characteristics for more detailed information. 1089fa 5 LT1089 U PACKAGE DESCRIPTIO K Package 4-Lead TO-3 Metal Can (Reference LTC DWG # 05-08-1311) 0.320 – 0.350 (8.13 – 8.89) 0.760 – 0.775 (19.30 – 19.69) 0.060 – 0.135 (1.524 – 3.429) 0.420 – 0.480 (10.67 – 12.19) 0.038 – 0.043 (0.965 – 1.09) 1.177 – 1.197 (29.90 – 30.40) 0.470 TP P.C.D. 0.655 – 0.675 (16.64 – 19.05) 0.151 – 0.161 (3.84 – 4.09) DIA 2 PLC 0.167 – 0.177 (4.24 – 4.49) R 72° 18° 0.490 – 0.510 (12.45 – 12.95) R K4(TO-3) 1098 OBSOLETE PACKAGE 1089fa 6 LT1089 U PACKAGE DESCRIPTIO T Package 5-Lead Plastic TO-220 (Standard) (Reference LTC DWG # 05-08-1421) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .147 – .155 (3.734 – 3.937) DIA .045 – .055 (1.143 – 1.397) .230 – .270 (5.842 – 6.858) .460 – .500 (11.684 – 12.700) .570 – .620 (14.478 – 15.748) .330 – .370 (8.382 – 9.398) .620 (15.75) TYP .700 – .728 (17.78 – 18.491) .095 – .115 (2.413 – 2.921) SEATING PLANE .152 – .202 .260 – .320 (3.861 – 5.131) (6.60 – 8.13) .155 – .195* (3.937 – 4.953) .013 – .023 (0.330 – 0.584) BSC .067 (1.70) .028 – .038 (0.711 – 0.965) .135 – .165 (3.429 – 4.191) * MEASURED AT THE SEATING PLANE T5 (TO-220) 0801 1089fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 7 LT1089 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1155 Dual High Side Micropower MOSFET Driver No External Charge Pump Required; N-Channel MOSFET LT1160/LT1162 Half/Full-Bridge N-Channel MOSFET Drivers 60V Floating Switch; Prevent Shoot Through LTC1693 High Speed Single/Dual N-Channel MOSFET Drivers SO-8; 1.5A Peak Output Current LTC1693-5 High Speed Single P-Channel MOSFET Driver 16ns Rise/Fall Times at VCC = 12V, CL = InF LTC1710 SMBus Dual High Side Switch Two 0.4Ω/300mA N-Channel Switches LTC1981/LTC1982 Single and Dual Micropower High Side Switch Controllers in SOT-23 No External Components Required LTC4412 Low Loss PowerPath Controller Automatic Switching Between DC Sources 1089fa 8 Linear Technology Corporation LW/TP 1002 1K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 1989