ltm8031 Linear Technology Corporation, ltm8031 Datasheet
ltm8031
Available stocks
Related parts for ltm8031
ltm8031 Summary of contents
Page 1
... Included in the package are the switching controller, power switches, inductor, fi lters and all support components. Operating over an input voltage range of 3.6V to 36V, the LTM8031 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. ...
Page 2
... This product is only offered in trays. For more information go to: 2 PIN CONFIGURATION BANK 1 BANK 2 BANK 3 T JMAX PART MARKING* PACKAGE DESCRIPTION 71-Lead (9mm × 15mm × 2.82mm) LGA LTM8031V 71-Lead (9mm × 15mm × 2.82mm) LGA LTM8031V http://www.linear.com/leadfree/ http://www.linear.com/packaging/ TOP VIEW ...
Page 3
... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTM8031E is guaranteed to meet performance specifi cations from 0°C to 125°C internal. Specifi cations over the –40°C to 125°C internal temperature range are assured by design, characterization and ...
Page 4
... LTM8031 TYPICAL PERFORMANCE CHARACTERISTICS 3.3V Effi ciency OUT 100 12V IN 50 24V IN 36V 200 400 600 800 OUTPUT CURRENT (mA) 8031 G01 Input Current vs Output Current, 3.3V OUT 800 5V IN 12V 700 IN 24V IN 36V 600 IN 500 400 300 200 100 ...
Page 5
... Temperature Rise vs Load Current OUT 30 36V IN 24V IN 25 12V 1000 1 200 400 600 800 OUTPUT CURRENT (mA) LTM8031 T = 25°C, unless otherwise noted. A Bias Current vs Output Current 35 8V OUT 5V OUT 30 3.3V OUT 200 400 600 ...
Page 6
... Also, make sure that BIAS + V is less than 56V. rises or falls RUN/SS (Pin L5): Pull RUN/SS pin to less than 0. shut down the LTM8031. Tie to 2.5V or more for normal operation. If the shutdown feature is not used, tie this pin to the V IN see the Applications Information section. ...
Page 7
... The PGOOD output is valid when V ® operation RUN/SS is high. If this function is not used, leave this pin fl oating. ADJ (Pin J7): The LTM8031 regulates its ADJ pin to 0.79V. Connect the adjust resistor from this pin to ground. The value given by the equation: ADJ ...
Page 8
... A simplifi ed Block Diagram is given on the previous page. The LTM8031 is designed with an input EMI fi lter and other features to make its radiated emissions compliant with several EMC specifi cations including EN55022 class B. ...
Page 9
... AUX 10μF 1206 6.3V 46.4k AUX 4.7μF 1206 10V 26.7k AUX 4.7μF 0805 16V 21.0k AUX LTM8031 OPTIMAL T(OPTIMAL) MAX T(MIN) 250kHz 150k 250kHz 150k 300kHz 124k 325kHz 113k 420kHz 84 ...
Page 10
... LTM8031. A ceramic input capacitor combined with trace or cable inductance forms a high Q (under damped) tank circuit. If the LTM8031 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 11
... In addition, the input voltage required to turn on is higher than that required to run, and depends upon whether the RUN/SS is used. As shown in the Typical Performance Characteristics section, it takes only about 3.6V LTM8031 to run a 3.3V output at light load. If RUN/SS is pulled enabled via the RUN/SS pin, the minimum voltage to start at light loads is lower, about 4 ...
Page 12
... Figure 2. The Input Diode Prevents a Shorted Input from Discharging a Back-Up Battery Tied to the Output. It Also Protects the Circuit from a Reversed Input. The LTM8031 Runs Only When the Input is Present 12 operation with a haphazard or poor layout. See Figure 3 for a suggested layout ...
Page 13
... Q of the integrated fi lter. Thermal Considerations The LTM8031 output current may need to be derated required to operate in a high ambient temperature or deliver a large amount of continuous power. The amount of current derating is dependent upon the input voltage, output power and ambient temperature ...
Page 14
... LTM8031 must be lower than the maximum rating of 125°C, so care should be taken in the layout of the circuit to ensure good heat sinking of the LTM8031. The bulk of the heat fl ow out of the LTM8031 is through the bottom of the module and the LGA pads into the printed 14 ...
Page 15
... SEE APPLICATIONS FOR START-UP DETAILS 1.8V Step-Down Converter OUT IN 1μF FIN LTM8031 AUX RUN/SS BIAS SHARE PGOOD RT SYNC GND ADJ 56.2k 191k 8031 TA03 *RUNNING VOLTAGE RANGE. SEE APPLICATIONS FOR START-UP DETAILS LTM8031 V OUT 0.82V 1A 200μF V OUT 1.8V 1A 100μF 8031fa 15 ...
Page 16
... SHARE PGOOD RT SYNC GND ADJ 48.7k 78.7k 8031 TA08 *RUNNING VOLTAGE RANGE. SEE APPLICATIONS FOR START-UP DETAILS 5V Step-Down Converter OUT IN FIN LTM8031 AUX RUN/SS 1μF BIAS SHARE PGOOD RT SYNC GND ADJ 29.4k 46.4k 8031 TA05 *RUNNING VOLTAGE RANGE. SEE APPLICATIONS FOR START-UP DETAILS V OUT 2.5V 1A 47μ ...
Page 17
... TYPICAL APPLICATIONS 10.5V TO 36V Two LTM8031s Operating in Parallel (Also See the LTM8032, 2A Pin Compatible) 11.5V TO 36V OPTIONAL SYNC TIE TO GND IF NOT USED 8V Step-Down Converter OUT IN FIN LTM8031 AUX RUN/SS 1μF BIAS SHARE PGOOD RT SYNC GND ADJ 23.7k 26.7k 8031 TA06 *RUNNING VOLTAGE RANGE. SEE APPLICATIONS FOR START-UP DETAILS ...
Page 18
... LTM8031 PACKAGE DESCRIPTION aaa Z PAD 1 CORNER 4 15.00 BSC X 9.00 Y BSC PACKAGE TOP VIEW 6.350 5.080 3.810 2.540 1.270 0.000 1.270 2.540 3.810 5.080 6.350 SUGGESTED PCB LAYOUT TOP VIEW 18 LGA Package 71-Lead (15mm × 9mm × 2.82mm) (Reference LTC DWG # 05-08-1823 Rev Ø) 2.670 – ...
Page 19
... PACKAGE DESCRIPTION Table 3. LTM8031 Pinout (Sorted by Pin Number) PIN SIGNAL DESCRIPTION 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights ...
Page 20
... V IN 3.6V ≤ V ≤ 36V, 0.8V ≤ EN55022 Class B, 9mm × 15mm × 2.8mm LGA. Pin Compatible with the LTM8031 www.linear.com ● ≤ 5V, 15mm × 15mm × 2.8mm LGA OUT ≤ 15V, 15mm × 15mm × 2.8mm LGA OUT ≤ ...