LT1076 Linear Technology Corporation, LT1076 Datasheet
LT1076
Available stocks
Related parts for LT1076
LT1076 Summary of contents
Page 1
... A 7-pin TO-220 package is also available which allows current limit to be adjusted down to zero. In addition, full micropower shutdown can be programmed. See Application Note 44 for design details. A fixed 5V output, 2A version is also available. See LT1076-5. , LTC and LT are registered trademarks of Linear Technology Corporation ...
Page 2
... LT1074HV/LT1076HV ......................................... 64V Switch Voltage with Respect to Input Voltage LT1074/ LT1076 .................................................. 64V LT1074HV/LT1076HV ......................................... 75V Switch Voltage with Respect to Ground Pin (V LT1074/LT1076 (Note 7) ..................................... 35V LT1074HV/LT1076HV (Note 7) ........................... 45V Feedback Pin Voltage ..................................... –2V, +10V Shutdown Pin Voltage (Not to Exceed V U PACKAGE/ORDER I FOR ATIO FRONT VIEW ...
Page 3
... C j > 125 through 2k (Note (Note 8) IN MAX 2V 2.5V REF = 2V C (Nominal) = 2.21V REF V (Note 8) IN MAX = 2.5V) SH THRESHOLD LT1074/LT1076 MIN TYP MAX UNITS 1.85 V 2.1 V 2.3 V 2.5 V 1 300 A 10 500 A 150 A 250 A 8 140 ...
Page 4
... Y V 24V (EQUIVALENT – – 1k LIM LIM (LT1074) I (LT1076). LIM 2k 5.5k = 40V for the LT1074/76 and 60V for the LT1074HV/76HV. LT1074 500 CURRENT LIMIT 0.04 COMP + C2 250 – 400 15 SWITCH OUTPUT ( LT1076 0.1 100 SWITCH OUTPUT ( LT1074 • BD01 ...
Page 5
... LIM source. When this pin is left open, it self-clamps at about 4.5V and sets current limit at 6.5A for the LT1074 and 2.6A for the LT1076. In the 7-pin package an external resistor can be connected from the I current limit. A capacitor in parallel with this resistor will soft-start the current limit. A slight offset in C2 guarantees ...
Page 6
... LT1074/LT1076 W U TYPICAL PERFOR A CE CHARACTERISTICS V Pin Characteristics C 200 150 V ADJUSTED FOR 100 –50 SLOPE 400k –100 –150 –200 VOLTAGE (V) LT1074•TPC01 Shutdown Pin Characteristics 50V IN 10 THIS POINT MOVES ...
Page 7
... JUNCTION TEMPERATURE ( C) Current Limit vs Temperature PIN OPEN LIM 10k LIM LIM 2 1 *MULTIPLY CURRENTS BY 0.4 FOR LT1076 0 75 –50 – 100 125 150 JUNCTION TEMPERATURE ( C) LT1074•TPC22 LT1074•TPC28 LT1074•TPC18 7 ...
Page 8
... Total inductance in input bypass connections P and capacitor. “Spike” height (dI/dt • approximately 2V per P inch of lead length for LT1074 and 0.8V per inch for LT1076. “Step” for ESR = 0.05 and I SW “Ramp” for C = 200 and 0.12V. Input current on the V ...
Page 9
... EXTERNAL (5V)(C LIM DIVIDER down is ensured by coupling C2 to Q1. R2 2.21k LT1074•PD03 = 2.21V will eventu the LT1074 will be LT1074/LT1076 pin low, which forces LIM , a current of IN )/2mA. Soft-start after full micropower shut –5 CURRENT FLOWS OUT OF SHUTDOWN PIN – ...
Page 10
... LT1074/LT1076 DESCRIPTIO S 300 SHUTDOWN – PIN C1 2.3V + – C2 0.3V + Figure 5. Shutdown Circuitry Undervoltage Lockout Undervoltage lockout point is set by R1 and R2 in Figure 6. To avoid errors due to the 10 A shutdown pin current usually set at 5k, and R1 is found from ...
Page 11
... FB the amount of foldback. D2 prevents the output voltage from forcing current back into the I value for *Change 0.44 to 0.16, and 0.5 to 0.18 for LT1076. Example LT1047•PD12 Error Amplifier The error amplifier in Figure single stage design with added inverters to allow the output to swing above and below the common mode input voltage ...
Page 12
... LT1074/LT1076 DESCRIPTIO X1.8 2.21V ALL CURRENTS SHOWN ARE AT NULL CONDITION mid frequencies high frequencies Phase shift from the FB pin to the V frequencies where the external C is controlling gain, then C drops back to 0 (actually 180 since inverting ...
Page 13
... FOR INPUT VOLTAGE > 10V, R1, R2, AND C4 CAN BE ELIMINATED, AND COMPENSATION IS DONE TOTALLY ON THE V PIN –2. OUT R1 = (R3) (1.86 (R3) (3.65) ** MAXIMUM OUTPUT CURRENT DETERMINED BY MINIMUM INPUT VOLTAGE OF 4.5V. HIGHER MINIMUM INPUT VOLTAGE WILL ALLOW MUCH HIGHER OUTPUT CURRENTS. SEE AN44. LT1074/LT1076 OUT † 5V, 10A R1 2. 4400 ...
Page 14
... LT1074/LT1076 PACKAGE DESCRIPTIO 0.320 – 0.350 0.420 – 0.480 (10.67 – 12.19) 0.060 0.256 (1.524) (6.502) 0.060 0.183 (1.524) (4.648) 0.075 (1.905) 0.300 (7.620) BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK 14 U Dimensions in inches (millimeters) unless otherwise noted. K Package ...
Page 15
... SEATING PLANE 0.152 – 0.202 (3.861 – 5.131) 0.260 – 0.320 (6.60 – 8.13) 0.135 – 0.165 (3.429 – 4.191) LT1074/LT1076 0.165 – 0.180 0.045 – 0.055 (4.191 – 4.572) (1.143 – 1.397) 15 TYP +0.008 0.004 –0.004 ...
Page 16
... LT1074/LT1076 U TYPICAL APPLICATIO 200 F V –5V TO –15V PACKAGE DESCRIPTIO 0.390 – 0.415 (9.906 – 10.541) 0.460 – 0.500 (11.684 – 12.700) 0.050 BSC (1.27) RELATED PARTS PART NUMBER DESCRIPTION LT1375/LT1376 1.5A, 500kHz Step-Down Switching Regulators LT1374/LT1374HV 4.5A, 500kHz Step-Down Switching Regulators LT1370 6A, 500kHz High Efficiency Switching Regulator ...