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LTM8040 Datasheet(PDF) 7 Page - Linear Technology |
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LTM8040 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 26 page  LTM8005 7 8005f For more information www.linear.com/LTM8005 PIN FUNCTIONS GND (Bank 1, Pin K1, Pin K8): Tie these GND pins to a local ground plane below the LTM8005 and the circuit components. In most applications, the bulk of the heat flow out of the LTM8005 is through these pads, so the printed circuit design has a large impact on the thermal performance of the part. See the PCB Layout and Thermal Considerations sections for more details. Return the feed- back divider to this net. SW (Bank 2): Power Switch Node. This is the drain of the internal power switching MOSFET. For boost, buck-boost mode and buck mode topologies, connect this bank to the inductor and the DA bank. For a SEPIC, connect this bank to an inductor winding and the positive coupling capacitor terminal. DA (Bank 3): Power Diode Anode. For boost, buck-boost mode and buck mode topologies, connect this bank to the inductor and the SW bank. For a SEPIC, connect this bank to an inductor winding and the negative coupling capacitor terminal. VOUT (Bank 4): Power Output Pins. Apply the output filter capacitor between these pins and the GND pins. ISN (Bank 5): Output Current Sense Resistor. The LTM8005 incorporates a sense resistor between VOUT and ISN to set the output current regulation point and for output current monitoring. If a larger output current is required, apply an external resistor between VOUT and ISN. Keep this pin voltage within 0.3V of VOUT. LED (Bank 6): LED Current Output. Connect the anode of the LED string to this bank. VIN (Pin F1): Input Power. The VIN pin supplies current to the LTM8005’s internal regulators and circuitry, and must be bypassed with a 0.22µF (or larger) capacitor placed close to the LTM8005. IVINN (Pin F2): Input Sense Resistor Signal. Apply an external sense resistor between IVINP and IVINN to set the maximum input current and for input current moni- toring. If this function is not required, tie both IVINP and IVINN to VIN. Keep this pin voltage within 0.3V of VIN. EN/UVLO (Pin G1): Enable and Precision UVLO. An accu- rate 1.22V falling threshold with externally programmable hysteresis detects when power is OK to enable switching. Rising hysteresis is generated by the external resistor divider, an internal 499k resistor between EN/UVLO and VIN and an accurate internal 3µA pull-down current. Above the threshold, EN/UVLO input bias current is sub-µA. Below the falling threshold, a 3µA pull-down current is enabled so the user can optimize the hysteresis with the external resistor selection. An undervoltage condition resets soft-start. The EN/UVLO pin may be connected directly to VIN, but do not drive this pin directly from another low impedance voltage source. If EN/UVLO must be driven from a voltage source, do so with at least a 50 series resistor. IVINP (Pin G2): Input Sense Resistor Signal. Apply an external sense resistor between IVINP and IVINN to set the maximum input current and for input current moni- toring. If this function is not required, tie both IVINP and IVINN to VIN. Keep this pin voltage within 0.3V of VIN. OVLO (Pin H1): Input Overvoltage Lockout Pin. An accurate 1.25V rising threshold detects when power is OK to enable switching. If not used, tie this pin to GND. IVINCOMP (Pin H2): Input Current Sense Amplifier Output Pin. The voltage at IVINCOMP pin is proportional to IIN as VIVINCOMP = IIN • RINSNS • 20. A 10nF capacitor to GND is provided internally at this pin to compensate the input current loop. Do not load this pin with a current and do not drive this pin with an external source, although additional capacitance may be added externally. SHORTLED (Pin H7): An open-collector pull-down on SHORTLED asserts when any of the following conditions happen: 1. FB < 0.3V after SS pin reaches 1.7V at start-up. 2. LED overcurrent (ILED > 2.4A). To function, the pin requires an external pull-up resistor. SHORTLED status is only updated during PWM high state and latched during PWM low state. SHORTLED remains asserted until the SS pin is discharged below 0.2V. If not used, leave floating or tie to GND. OPENLED (Pin H8): Fault Indicator. An open-collector pull-down on OPENLED asserts if the FB input is above 1.20V (typical), and the LED current is less than 0.16A (typical). To function, the pin requires an external pull-up |
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Similar Description - LTM8040 |
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