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LTC3534 Datasheet(PDF) 7 Page - Linear Technology |
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LTC3534 Datasheet(HTML) 7 Page - Linear Technology |
7 / 20 page LTC3534 7 3534fb For more information www.linear.com/LTC3534 GND Pads (Pins 1, 8, 9, 16; GN Package): IC Substrate Grounds. These pins MUST be soldered to the printed circuit board ground to provide both electrical contact and a good thermal contact to the PCB. RUN/SS (Pin 2): Combined Shutdown and Soft-Start. Ap- plying a voltage below 400mV shuts down the IC. Apply a voltage above 1.4V to enable the IC and above 2.4V to ensure that the error amp is not clamped from soft-start. An R-C from the enable command signal to this pin will provide a soft-start function by limiting the rise time of the VC pin. PWM mode operation must be commanded to properly enable the IC. GND (Pin 3): Signal Ground for the IC. PGND1,PGND2(Pins4,7):PowerGroundfortheInternal N-channel MOSFET Power Switches (Switches B and C). SW1 (Pin 5): Switch Pin where Internal Switches A and B are Connected. Connect inductor from SW1 to SW2. Minimize trace length to reduce EMI. SW2 (Pin 6): Switch Pin where Internal Switches C and D are Connected. Minimize trace length to reduce EMI. PWM (Pin 10): Burst Mode Select. PWM must be driven HIGH during start-up. When VOUT is in regulation, the PWM pin may be driven LOW to command Burst Mode operation. Applying a voltage below 400mV enables Burst Modeoperation,providingasignificantefficiencyimprove- ment at light loads. Burst Mode operation will continue until this pin is driven high. Applying a voltage above 1.4V disables Burst Mode operation, enabling low noise, fixed frequency operation. VOUT(Pin11):OutputoftheSynchronousRectifier.Afilter capacitor is placed from VOUT to GND. A ceramic bypass capacitor is recommended as close to the VOUT and GND pins as possible. VOUT is given by the following equation: VOUT =1.000• R1 +R2 R2 V PVIN (Pin 12): Power VIN Supply Pin. A 10µF ceramic capacitor is recommended as close to the PVIN and PGND pins as possible. VIN (Pin 13): Input Supply Pin. Connect the power source to this pin. VC (Pin 14): Error Amp Output. An R-C network is con- nected from this pin to FB for loop compensation. Refer to “Closing the Feedback Loop” section for component selection guidelines. FB (Pin 15): Feedback Pin. Connect VOUT resistor divider tap to this pin. The output voltage can be adjusted from 1.8V to 7V. The feedback reference voltage is typically 1V. ExposedPad(Pin17;DHCPackage):ICSubstrateGround. This pin MUST be soldered to the printed circuit board ground to provide both electrical contact and a good thermal contact to the PCB. pin FuncTions |
Similar Part No. - LTC3534_15 |
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Similar Description - LTC3534_15 |
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