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LTC7851 DC/DC Controller
Analog Devices' LTC7851 quad output, multiphase step-down voltage mode DC/DC controller with accurate current sharing
ADI's LTC7851 and LTC7851-1 are quad output multiphase synchronous step-down switching regulator controllers that employ a constant frequency voltage mode architecture. They maintain excellent current balance between channels when paralleled with their internal current sharing loop. Lossless DCR or a low-value RSENSE is used for output current sensing. Multiple LTC7851/LTC7851-1 devices can be used for high phase count operation.
A very low offset, high bandwidth error amplifier, combined with remote output voltage sensing, provides excellent transient response, and output regulation. The LTC7851/ LTC7851-1 operates with a VCC supply voltage from 3 V to 5.5 V and is designed for step-down conversion with VIN from 3 V to 27 V and produces an output voltage from 0.6 V to VCC - 0.5 V.
The LTC7851-1 is identical to the LTC7851 except it has a lower current sense amplifier gain, making it ideal for DrMOS devices with internal current sense.
- Operates with power blocks, DrMOS, or external gate drivers and MOSFETs
- Voltage mode control with accurate current sharing
- ±0.75% 0.6 V voltage reference
- Quad differential output voltage sense amplifiers
- Lossless current sensing using inductor DCR or precision current sensing with sense resistor or DrMOS with integrated current sensing
- Multiphase capability
- Phase-lockable fixed frequency 250 kHz to 2.25 MHz
- VCC range: 3 V to 5.5 V
- VOUT range: 0.6 V to VCC - 0.5 V
- Power good output voltage monitor
- Output voltage tracking capability with soft-start
- Available in 58-lead 5 mm x 9 mm QFN package
- High current distributed power systems
- DSP, FPGA, and ASIC supplies
- Datacom, telecom, and computing systems
Evaluation Boards
| Image | Manufacturer Part Number | Description | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|
 |  | DC2380A-A | EVAL BOARD FOR LTC7851 | 1 - Immediate | $1,318.34 | View Details |
|  | DC2380A-C | EVAL BOARD FOR LTC7851 | 1 - Immediate | $2,394.43 | View Details |
|  | DC2380A-B | EVAL BOARD FOR LTC7851 | 1 - Immediate | $2,005.06 | View Details |
ICs
| Image | Manufacturer Part Number | Description | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|
|  | LTC7851IUHH-1#PBF | IC REG CTRLR BUCK 58QFN | 70 - Immediate | $84.22 | View Details |
| | LTC7851EUHH#PBF | IC REG CTRLR BUCK 58QFN | 30 - Immediate | $76.22 | View Details |
| | LTC7851IUHH#PBF | IC REG CTRLR BUCK 58QFN | 0 - Immediate | $44.80 | View Details |
| | LTC7851EUHH-1#PBF | IC REG CTRLR BUCK 58QFN | 43 - Immediate | $76.22 | View Details |
| | LTC7851EUHH#TRPBF | IC REG CTRLR BUCK 58QFN | 0 - Immediate | $37.04 | View Details |
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