LT1963 Linear, LT1963 Datasheet
LT1963
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LT1963 Summary of contents
Page 1
... In addition to fast transient response, the LT1963 regulators have very low output noise which makes them ideal for sensitive RF supply applications. Output voltage range is from 1.21V to 20V. The LT1963 regulators are stable with output capacitors as low Internal protection circuitry includes reverse battery protection, current limiting, thermal limiting and reverse current protection ...
Page 2
... Lead Temperature (Soldering, 10 sec).................. 300 FRONT VIEW ORDER PART NUMBER LT1963EQ LT1963EQ-1.5 LT1963EQ-1.8 TAB IS T PACKAGE LT1963EQ-2.5 GND 5-LEAD PLASTIC TO-220 LT1963EQ-3.3 *PIN 5 = SENSE FOR LT1963-1.8/LT1963-2.5/LT1963-3.3 = ADJ FOR LT1963 T = 150 C, JMAX ORDER PART NUMBER LT1963EST-1.5 LT1963EST-1.8 OUT 1 LT1963EST-2.5 SENSE/ADJ* 2 GND 3 LT1963EST-3 ...
Page 3
... PARAMETER CONDITIONS LT1963-2.5 LT1963-3.3 ADJ Pin Voltage LT1963 (Notes 4, 5) Line Regulation LT1963-1.5 LT1963-1.8 LT1963-2.5 LT1963-3.3 LT1963 (Note 4) Load Regulation LT1963-1.5 LT1963-1.8 LT1963-2.5 LT1963-3.3 LT1963 (Note 4) V Dropout Voltage I LOAD OUT(NOMINAL) LOAD (Notes 6, 7, 12) I LOAD I LOAD I LOAD I LOAD ...
Page 4
... C. Performance at – and 125 C is assured by design, A characterization and correlation with statistical process controls. Note 4: The LT1963 (adjustable version) is tested and specified for these conditions with the ADJ pin connected to the OUT pin. Note 5: Operating conditions are limited by maximum junction temperature ...
Page 5
... TEMPERATURE ( C) LT1963-3.3 Quiescent Current SHDN INPUT VOLTAGE (V) LT1963-2.5 GND Pin Current SHDN *FOR V OUT 8.33 300mA 25 100mA 250 10mA ...
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... OUT 1. 1. 500mA INPUT VOLTAGE (V) LT1963 GND Pin Current 100 SHDN IN *FOR V = 1.21V OUT 0.81 1.5A 1.21 1A 2.42 500mA* ...
Page 7
... G25 Current Limit 4 3.5 OUT 3.0 2.5 2.0 1.5 1.0 0.5 0 –50 0 –25 TEMPERATURE ( C) Reverse Output Current 1 0 1.21V (LT1963) OUT V = 1.8V (LT1963-1.8) OUT 0 2.5V (LT1963-2.5) OUT V = 3.3V (LT1963-3.3) 0.7 OUT 0.6 LT1963-1.8/-2.5/-3.3 0.5 0.4 LT1963 0.3 0.2 0.1 0 – 100 125 –25 TEMPERATURE ( C) 1963 G30 ADJ Pin Bias Current 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 – – ...
Page 8
... V +1V IN OUT(NOMINAL) (LT1963-1.8/-2.5/-3.3) – 2.7V (LT1963 1mA TO 1.5A L – 20 – 100 125 –25 0 TEMPERATURE ( C) 1963 G34 LT1963-3.3 10Hz to 100kHz Output Noise V OUT 100 V/DIV OUT I = 1.5A LOAD 1063 G36 LT1963-3.3 Transient Response 150 100 50 0 –50 –100 –150 1.5 1.0 ...
Page 9
... P capacitor in battery-powered circuits. A bypass capacitor in the range sufficient. The LT1963 regu- lators are designed to withstand reverse voltages on the IN pin with respect to ground and the OUT pin. In the case of a reverse input, which can happen if a battery is plugged in backwards, the device will act as if there is a diode in series with its input ...
Page 10
... The devices are protected against both reverse input and reverse output voltages. In battery backup applica- tions where the output can be held backup battery when the input is pulled to ground, the LT1963-X acts like it has a diode in series with its output and prevents reverse current flow. Additionally, in dual supply applications ...
Page 11
... For a ceramic capacitor the stress can be induced by vibrations in the system or thermal transients. Overload Recovery Like many IC power regulators, the LT1963-X has safe operating area protection. The safe area protection de- creases the current limit as input-to-output voltage in- creases and keeps the power transistor inside a safe operating region for all values of input-to-output voltage ...
Page 12
... Current curves in the Typical Performance Characteris- tics. Power dissipation will be equal to the sum of the two components listed above. The LT1963 series regulators have internal thermal lim- iting designed to protect the device during overload conditions. For continuous normal conditions, the maxi- mum junction temperature rating of 125 C must not be exceeded ...
Page 13
... Current flow back into the output will follow the curve shown in Figure 5. When the IN pin of the LT1963 is forced below the OUT pin or the OUT pin is pulled above the IN pin, input current will typically drop to less than 2 A. This can happen if the ...
Page 14
... LT1963 Series U TYPICAL APPLICATIO S SCR Pre-Regulator Provides Efficiency Over Line Variations L2 10VAC AT 115V IN 90-140 VAC 10VAC AT 115V IN 1N4002 1N4002 “SYNC” 2.4k 1N4002 TO ALL “+V” + POINTS 22 F 750 PACKAGE DESCRIPTIO 0.060 0.256 (1.524) (6.502) 0.060 0.183 (1.524) (4.648) 0.075 (1.905) 0.300 (7 ...
Page 15
... SEATING PLANE 0.152 – 0.202 (3.861 – 5.131) 0.260 – 0.320 (6.60 – 8.13) 0.135 – 0.165 0.028 – 0.038 (3.429 – 4.191) (0.711 – 0.965) LT1963 Series 0.189 – 0.197* (4.801 – 5.004 0.150 – 0.157** 0.228 – 0.244 (3.810 – 3.988) (5.791 – ...
Page 16
... LT1963 Series U TYPICAL APPLICATIO S Adjustable Current Source R5 0. > 2. LT1004-1 2.2k 2.2k 80. NOTE: ADJUST R1 FOR 3 1.5A CONSTANT CURRENT RELATED PARTS PART NUMBER DESCRIPTION LT1120 125mA Low Dropout Regulator with LT1121 150mA Micropower Low Dropout Regulator LT1129 ...