Analog Devices Inc. LTM8051 Demonstration Board (DC2860A)
Analog Devices Inc. LTM8051 Demonstration Board (DC2860A) provides a reference design for a quad step-down DC-DC switching converter based on the LTM8051 Silent Switcher® μModule® Regulator. The Silent Switcher architecture of the LTM8051 minimizes EMI while delivering high efficiency at frequencies up to 3MHz. The LTM8051 integrates the controllers, power switches, inductors, and support components. Operating over a wide input voltage range, the LTM8051 supports output voltages from 0.8V to 8.0V and a switching frequency range of 300kHz to 3MHz, each set by a single resistor.
The Analog Devices Inc. DC2860A Demonstration Board is designed to deliver quad 5.0V/1.2A, 3.3V/1.2A, 2.5V/1.2A, and 1.8V/1.2A outputs from a 7.0V to 40.0V input. The modes of operation (Burst Mode® operation or discontinuous mode/SYNC) are jumper selectable. Burst Mode operation improves efficiency at light loads.
The switching frequency of channel 1 and channel 4 is set by an appropriate resistor (R11) from the RT14 pin to ground. The switching frequency of channel 2 and channel 3 is set by another appropriate resistor (R23) from the RT23 pin to ground. The RUN14 pin (RUN14 terminal) can be used to set the LTM8051 channel 1 and channel 4 in micropower shut-down mode, while the RUN23 pin (RUN23 terminal) can be used to set channel 2 and channel 3 in shutdown mode. Output tracking and soft-start pins (TRSS1/TRSS2/TRSS3/TRSS4) allow user control of the output voltage ramp rate during startup. The Power Good output of each channel (PG1/PG2/PG3/PG4) will be low when that channel's output voltage is outside of the ±7.5% regulation window.
Features
- TM8051 Silent Switcher μModule Regulator
- 40.0VIN with configurable 1.2A output array
- 6.25mm x 11.25mm x 2.22mm BGA91
- All required support capacitors and resistors
- Jumper selectable Burst Mode or discontinuous mode/SYNC
- Easy-to-access test-point turrets for all key signals
Specifications
- 7.0V to 40.0V input voltage range (VIN)
- 5.0V ±2% output voltage (VOUT1)
- 3.3V ±2% output voltage (VOUT2)
- 2.5V ±2% output voltage (VOUT3)
- 1.8V ±2% output voltage (VOUT4)
- 1.2A maximum output current (IOUT1)
- 1.2A maximum output current (IOUT2)
- 1.2A maximum output current (IOUT3)
- 1.2A maximum output current (IOUT4)
- 87.5% typical efficiency
Supported Devices
Analog Devices Inc. LTM8051 Quad 40Vɪⲛ µModule® Regulators
Quad 40VIN and 1.2A step-down regulators with a wide operating voltage range.
Board Layout
Test Setup
