ltm8023 Linear Technology Corporation, ltm8023 Datasheet
ltm8023
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ltm8023 Summary of contents
Page 1
... Included in the package are the switching controller, power switches, inductor, and all support components. Operating over an input voltage range of 3.6V to 36V, the LTM8023 supports an output voltage range of 0.8V to 10V, and a switching frequency range of 200kHz to 2.4MHz, each set by a single resistor. Only the bulk input and output fi ...
Page 2
... Solder Temperature ............................................... 240°C ORDER INFORMATION LEAD FREE FINISH PART MARKING LTM8023EV#PBF LTM8023V Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. For more information on lead free part marking, go to: This product is only offered in trays. For more information go to: 2 ...
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... SYNC OUT SYNC Note 2: The LTM8023E is guaranteed to meet performance specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 51μF is composed of a 4.7μF ceramic capacitor in parallel OUT with a 47μ ...
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... LTM8023 TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency (8V ) OUT 100 OUT 12V IN 30 24V IN 36V IN 20 0.01 0.1 1 OUTPUT CURRENT (A) 8023 G01 Minimum Required Input Voltage vs Output Voltage OUT OPERATING FREQUENCY AS RECOMMENDED 10 IN TABLE ...
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... LOAD CURRENT (mA) 2500 2000 1500 1000 500 25°C 40°C 85° 8023 G14 LTM8023 T = 25°C unless otherwise noted A Maximum Load Current vs Input Voltage (8V ) OUT 2500 2000 1500 1000 500 0 2000 INPUT VOLTAGE (V) 8023 G11 Load Current vs Input Voltage (3 ...
Page 6
... ADJ pin is within 10% of the fi nal regulation voltage output is valid when V high. If this function is not used, leave this pin fl oating. ADJ (Pin H7): The LTM8023 regulates its ADJ pin to 0.79V. Connect the adjust resistor from this pin to ground. The IN value of R ...
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... BLOCK DIAGRAM V IN 0.1μF SHARE CURRENT MODE CONTROLLER RUN/SS SYNC 4.7μH GND R T LTM8023 V OUT 4.7pF 499k 10μF AUX BIAS PGOOD ADJ 8023 BD 8023f 7 ...
Page 8
... The LTM8023 contains a current mode controller, power switching element, power inductor, power Schottky diode and a modest amount of input and output capacitance. The LTM8023 is a fi xed frequency PWM regulator. The switching frequency is set by simply connecting the ap- propriate resistor value from the R An internal regulator provides power to the control circuitry ...
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... AUX 4.7μF 0805 93.1k AUX 10μF 0805 53.6k AUX 10μF 0805 42.2k AUX 22μF 1206 154k AUX 10μF 0805 93.1k AUX 10μF 0805 53.6k AUX LTM8023 f (kHz (kHz) OPTIMAL T(OPTIMAL) MAX 250 150k 250 300 124k 300 350 105k 350 400 88.7k 400 ...
Page 10
... LTM8023 if the output is overloaded or short circuited. A frequency that is too low can result in a fi nal design that has too much output ripple or too large of an output cap. The maximum frequency (and attendant R the LTM8023 should be allowed to switch is given in Table 1 in the f (MAX) (and R value) for optimal effi ...
Page 11
... The RUN/SS pin can be used to soft-start the LTM8023, reducing the maximum input current during startup. The Figure 2. The LTM8023 Needs More Voltage to Start Than to Run RUN/SS pin is driven through an external RC fi lter to cre- ate a voltage ramp at this pin. Figure 3 shows the startup and shutdown waveforms with the soft-start circuit ...
Page 12
... Shorted Input Protection Care needs to be taken in systems where the output will be held high when the input to the LTM8023 is absent. This may occur in battery charging applications or in battery backup systems where a battery or some other supply is diode OR-ed with the LTM8023’s output. If the pin is allowed to fl ...
Page 13
... LTM8023 into an energized supply, the input network should be designed to prevent this overshoot. Figure 6 shows the waveforms that result when an LTM8023 circuit is connected to a 24V supply through six feet of 24-gauge twisted pair. The fi rst plot is the response with a 2.2μF ceramic capacitor at the input ...
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... INDUCTANCE ENERGIZED DUE TO 6 FEET 24V SUPPLY (2 METERS) OF TWISTED PAIR + 0.1μF + 22μF 35V AI.EI. Figure 6. A Well Chosen Input Network Prevents Input Voltage Overshoot and Ensures Reliable Operation When the LTM8023 is Connected to a Live Supply 20V/DIV V IN LTM8023 4.7μ ...
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... RUN/SS AUX LTM8023 SHARE PGOOD ADJ R GND SYNC T 8023 TA02 105k 1.8V Step-Down Converter OUT BIAS 4.7μF RUN/SS AUX LTM8023 SHARE PGOOD ADJ R GND SYNC T 8023 TA03 79k LTM8023 V OUT 0.82V 2A 200μF 13M V OUT 1.8V 2A 100μF 383k 8023f 15 ...
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... Step-Down Converter OUT DC 2.2μF RUN/SS SHARE AUX LTM8023 3.3V BIAS PGOOD ADJ R GND SYNC T 8023 TA04 61.9k 5V Step-Down Converter OUT DC AUX 2.2μF RUN/SS BIAS LTM8023 SHARE PGOOD ADJ R GND SYNC T 8023 TA05 49.9k V OUT 2.5V 2A 47μF 226k V OUT 5V 2A 4.7μF 93.1k 8023f ...
Page 17
... 31V RUN/SS BIAS LTM8023 SHARE PGOOD 2.2μF R GND SYNC T 8023 TA06 39.2k 6.5V TO 36V OUT AUX 10μF ADJ 93.1k –5V Two LTM8023’s in Parallel, 3. RUN/SS LTM8023 SHARE PGOOD 2.2μF R SYNC GND T 49. 2.2k RUN/SS LTM8023 SHARE PGOOD 2.2μF 0.22μF ...
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... LTM8023 PACKAGE DESCRIPTION Z aaa bbb 4.445 3.175 1.905 0.635 0.000 0.635 1.905 3.175 4.445 0.3175 0.635 0.9525 8023f ...
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... F7 GND OUT V G3 OUT V G5 OUT V G6 OUT GND G7 GND H1 GND H2 GND H3 GND H5 RUN/SS GND H6 GND H7 LTM8023 GND GND GND GND GND GND GND GND GND GND AUX GND SHARE BIAS SYNC PGOOD ...
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... McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● OUT 5.5V TO 36V AUX RUN/SS BIAS LTM8023 2.2μF SHARE ADJ R GND SYNC T 8023 TA07 49.9k 154k COMMENTS Pin Compatible, 4.5V ≤ V ≤ 28V, 15mm × 15mm × 2.8mm LGA Package IN Pin Compatible; Remote Sensing; PLL, Tracking and Margining, 4.5V ≤ V 2.375V ≤ ...