ltm8008 Linear Technology Corporation, ltm8008 Datasheet
ltm8008
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ltm8008 Summary of contents
Page 1
... In addition to providing these outputs, the SEPIC converter can supply additional 500mA to the system load. The LTM8008 is packaged in a thermally enhanced, compact (15mm × 15mm) and low profile (2.82mm) over-molded land grid array (LGA) package suitable for automated assembly by standard surface mount equipment. The LTM8008 is Pb-free and RoHS compliant. Six Output DC/DC µ ...
Page 2
... V OUT6 2 SPV 1 VALUES DETERMINED PER JESD51-9, MAX OUTPUT POWER PART MARKING PACKAGE DESCRIPTION LTM8008V 121-Lead (15mm × 15mm × 2.82mm) LGA http://www.linear.com/leadfree/ http://www.linear.com/packaging/ The denotes specifications that apply over the full operating temperature l = 25°C (Note 2) A CONDITIONS ...
Page 3
... LOAD SPV = OUT1 Note 2: The LTM8008HV is guaranteed to meet performance specifications from –40°C to 150°C internal operating temperature range. Note that the maximum internal temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. ...
Page 4
... LTM8008 Typical perForMance characTerisTics V vs Load OUT1 5.018 5.016 5.014 5.012 5.010 5.008 5.006 5.004 5.002 5.000 0 100 200 300 400 LOAD CURRENT (mA) 8008 G01 SPV vs Percentage of LDO Load 5.625 5.620 5.615 5.610 5.605 MAXIMUM RATED LDO LOAD (%) ...
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... TEMPERATURE (° 100 120 140 8008 G13 12V IN 24V 100 8008 G15 LTM8008 V Pin Current vs Temperature IN (No Load) 150 140 24V IN 130 120 110 100 90 80 12V 120 140 –40 – ...
Page 6
... Tie the SYNC pin to GND if this feature is not used. See the Synchronization section in Applications Information. RT (J1, J2): The RT pin is used to program the switching frequency of the LTM8008 by connecting a resistor from this pin to ground. Table 1 gives the resistor values that correspond to the resultant switching frequency. Minimize the capacitance at this pin. ...
Page 7
... operaTion The LTM8008 is a SEPIC equipped with six high perfor- mance linear post regulators. The device contains the SEPIC power MOSFET, controller, linear regulators and optimized support circuitry. The current limit for the SEPIC converter is internally set to 8.2A. The output of the SEPIC converter is internally set to 5 ...
Page 8
... If RUN is above 1.21V, the LTM8008 is running. Below 1.21V and above 0.7V, the LTM8008 is off and the RUN pin sinks a hysteresis current (typically 2μA). Below 0.7V, the LTM8008 is not switching and low power state, drawing less than 70µ voltage and rising threshold voltage can be calculated by ...
Page 9
... LTM8008 is capable of turning on the power MOSFET. This time is generally about 220ns (typical) (see Minimum On-Time in the Electrical Characteristics table). In each switching cycle, the LTM8008 keeps the power switch off for at least 220ns (typical) (see Minimum Off-Time in the Electrical Characteristics table). Soft-Start ...
Page 10
... GND pads and the ground plane of the board. For the LTM8008 to deliver its full output power imperative that a good thermal path be provided to dissipate the heat generated within the package. ...
Page 11
... GND vias to provide both a good ground connection and thermal path to the internal planes of the printed circuit board. Pay attention to the location and density of the thermal vias in Figure 3. The LTM8008 can benefit from the heat-sinking afforded by vias that connect to internal GND planes at these locations, due to their proximity to internal power handling components ...
Page 12
... For normal operation, the junction temperature should not exceed 150°C. When any of the V of the LTM8008, input current to the corresponding post regulator will typically drop to less than 2μA. The output of the linear post regulators can be pulled below ground without damaging the device ...
Page 13
... GND F4 GND H4 GND F5 GND H5 GND F6 GND H6 GND F7 GND H7 GND F8 GND H8 GND F9 GND H9 GND F10 GND H10 GND F11 GND H11 GND LTM8008 PIN NAME PIN NAME GND GND J3 GND L3 SYNC J4 GND GND L5 GND J6 GND L6 GND J7 GND L7 GND L8 ...
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... LTM8008 package DescripTion bbb // 6.350 5.080 3.810 2.540 1.585 1.270 0.955 0.000 1.270 2.540 3.810 5.080 6.350 8008fa ...
Page 15
... 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. to Fall Below 1µA” spec Q LTM8008 PAGE NUMBER 3 8008fa 15 ...
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... Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Six Output DC/DC µModule Regulator L1A 10µF SBR3U100LP-7 4.7µH SW L1B V IN 4.7µH SPV V OUT1 V OUT2 LTM8008 SS V OUT3 RT V OUT4 OUT5 SYNC V OUT6 RUN INTV GND CC 22µF 22nF 4.7µ ...