ltm8022 Linear Technology Corporation, ltm8022 Datasheet
ltm8022
Available stocks
Related parts for ltm8022
ltm8022 Summary of contents
Page 1
... Included in the package are the switching control- ler, power switches, inductor, and all support components. Operating over an input voltage range of 3.6V to 36V, the LTM8022 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
... ORDER INFORMATION LEAD FREE FINISH PART MARKING LTM8022EV#PBF LTM8022V Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: This product is only offered in trays. For more information go to: ...
Page 3
... SYNC OUT SYNC Note 2: The LTM8022E 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 and a 47μF OUT electrolytic ...
Page 4
... LTM8022 TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load (8V ) OUT 95 12V IN 90 24V IN 85 36V 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 OUTPUT CURRENT (A) 8022 G01 Minimum Required Input Voltage vs Output Voltage OUT OUTPUT VOLTAGE (V) 8022 G04 Input Current vs Output ...
Page 5
... LOAD CURRENT (mA) Minimum Required Input Voltage ) vs Output Load (3.3V OUT 1200 1000 800 600 400 200 25°C 85° 8022 G14 LTM8022 ( unless otherwise noted) ° A Minimum Required Input Voltage vs Output Load (8V ) OUT 1200 1000 800 600 400 200 0 1000 ...
Page 6
... PG output is valid when V is above 3.6V and RUN/SS is high. If this function is not IN used, leave this pin fl oating. ADJ (Pin H7): The LTM8022 regulates its ADJ pin to 0.79V. Connect the adjust resistor from this pin to ground. The value given by the equation, R ...
Page 7
... The LTM8022 contains a current mode controller, power switching element, power inductor, power Schottky diode and a modest amount of input and output capacitance. The LTM8022 is a fi xed frequency PWM regulator. The switching frequency is set by simply connecting the ap- propriate value resistor from the R An internal regulator provides power to the control cir- cuitry ...
Page 8
... LTM8022 APPLICATIONS INFORMATION Table 1. Recommended Component Values and Confi guration OUT IN 3.6V to 36V 0.82V 2.2μF 3.6V to 36V 1V 2.2μF 3.6V to 36V 1.2V 2.2μF 3.6V to 36V 1.5V 2.2μF 3.6V to 36V 1.8V 2.2μF 3.8V to 36V 2V 2.2μF 3.8V to 36V 2.2V 2.2μF 3.8V to 36V 2.5V 2.2μF 4.75V to 36V 3.3V 2.2μF 6.8V to 36V 5V 2.2μF 11.5V to 36V 8V 2.2μF 3.6V to 15V 0.82V 2.2μ ...
Page 9
... LTM8022. A ceramic input capacitor combined with trace or cable inductance forms a high Q (under damped) tank circuit. If the LTM8022 circuit is plugged into a live supply, the input voltage can ring to twice its nominal value, possi- bly exceeding the device’s rating. This situation is easily avoided ...
Page 10
... The maximum frequency and corresponding R which the LTM8022 should be allowed to switch is given in Table 1 in the R and f columns, while the recom- ...
Page 11
... Tie it to GND if not used. Shorted Input Protection Care needs to be taken in systems where the output will be held high when the input to the LTM8022 is absent. This may occur in battery charging applications battery backup systems where a battery or some other supply is diode ORed with the LTM8022’s output. If the V allowed to fl ...
Page 12
... PCB Layout Most of the headaches associated with PCB layout have been alleviated or even eliminated by the high level of integration of the LTM8022. The LTM8022 is nevertheless a switching power supply, and care must be taken to minimize EMI and ensure proper operation. Even with the high level of integration, you may fail to achieve specifi ...
Page 13
... The small size, robustness and low impedance of ceramic capacitors make them an attractive option for the input bypass capacitor of LTM8022. However, these capacitors can cause problems if the LTM8022 is plugged into a live supply (see Linear Technology Application Note 88 for a complete discussion). The low loss ceramic capacitor combined with stray inductance, in series with the power source, forms an underdamped tank circuit ...
Page 14
... APPLICATIONS INFORMATION CLOSING SWITCH SIMULATES HOT PLUG + LOW IMPEDANCE ENERGIZED 24V SUPPLY + 22μF AI.EI. + 0.1μF Figure 5. A Well Chosen Input Network Prevents Input Voltage Overshoot and Ensures Reliable Operation When the LTM8022 is Connected to a Live Supply 20V/DIV LTM8022 4.7μF I ...
Page 15
... APPLICATIONS INFORMATION FOR START-UP DETAILS 1.8V Step-Down Converter OUT LTM8022 2.2μF BIAS AUX RUN/SS PG SHARE R GND SYNC ADJ T 39.2k 383k 8022 TA03 *RUNNING VOLTAGE RANGE. PLEASE REFER TO APPLICATIONS INFORMATION FOR START-UP DETAILS LTM8022 V OUT 0.82V 1A 200μF V OUT 1.8V 1A 68μF 15 8022f ...
Page 16
... RUN/SS AUX SHARE PG 3.3V BIAS R GND SYNC ADJ T 59k 226k 8022 TA04 *RUNNING VOLTAGE RANGE. PLEASE REFER TO APPLICATIONS INFORMATION FOR START-UP DETAILS OUT LTM8022 AUX BIAS 10μF PG 93.1k V OUT –5V 8022 TA05 V OUT 2.5V 1A 47μF – Positive-to-Negative Converter Load Current vs Input Voltage ...
Page 17
... TYPICAL APPLICATIONS V IN 5.5V TO 36V OPTIONAL SYNC Two LTM8022’s in Parallel, 3. OUT LTM8022 RUN/SS AUX SHARE BIAS PG 2.2μF RT GND SYNC ADJ 43.2k 78.7k IN OUT LTM8022 RUN/SS AUX SHARE BIAS PG 2.2μF R GND SYNC ADJ T 43.2k *RUNNING VOLTAGE RANGE. PLEASE REFER TO APPLICATIONS INFORMATION FOR START-UP DETAILS NOTE: SYNCRONIZE THE TWO MODULES TO AVOID BEAT FREQUENCIES IF REQUIRED ...
Page 18
... LTM8022 PACKAGE DESCRIPTION Z aaa 18 LGA Package 50-Lead (11.25mm × 9.00mm × 2.82mm) (Reference LTC DWG # 05-08-1804 Rev 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 8022f ...
Page 19
... PACKAGE DESCRIPTION Table 3. LTM8022 Pinout (Sorted by Pin Number) PIN Information f μrnished by Linear Technology Corporation is believed to be acc μrate and reliable. However, no responsibility is ass μmed for its μse. Linear Technology Corporation makes no representa- tion that the interconnection of its circ μ ...
Page 20
... LGA 4V ≤ V ≤ 36V, 1.25V ≤ OUT ≤ 10V, 11.25mm × 9mm × 2.82mm LGA, 3.6V ≤ V ≤ 36V, 0.8V ≤ OUT Pin Compatible with LTM8022 www.linear.com ● V OUT 3.3V 1A 22μF ≤ 28V IN LT 0108 • PRINTED IN USA © ...