LTC3838 - Dual, Fast, Accurate Step- Down DC/DC Controller with Differential Output Sensing
The LTC®3838 is a dual, PolyPhase® synchronous step-down DC/DC switching regulator controller. Two independent channels drive all N-channel power MOSFETs. The controlled on-time, valley current mode control architecture allows for fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load current. Its load-release transient detection feature significantly reduces overshoot at low output voltages.
Differential output voltage sensing, along with a precision internal reference, offers an accurate ±0.67% output regulation on Channel 1, even if the remote output ground deviates from local ground by ±500mV. The second channel can either provide an independent ±1% output, or together with the first channel of this controller, serve as one of the PolyPhase channels for a single-output voltage.
The switching frequency can be programmed from 200kHz to 2MHz with an external resistor, and can be synchronized to an external clock. Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Voltage tracking soft start-up and multiple safety features are provided.
Features
Typical Application  | Applications
Packaging  |
Order Information
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LTC3838EFE#PBF | TSSOP-38 | E | $4.86 | $3.40 |
| LTC3838EFE#TRPBF | TSSOP-38 | E | $3.46 | |
| LTC3838EUHF#PBF | 5x7 QFN-38 | E | $4.54 | $3.18 |
| LTC3838EUHF#TRPBF | 5x7 QFN-38 | E | $3.24 | |
| LTC3838IFE#PBF | TSSOP-38 | I | $5.54 | $3.88 |
| LTC3838IFE#TRPBF | TSSOP-38 | I | $3.94 | |
| LTC3838IUHF#PBF | 5x7 QFN-38 | I | $5.13 | $3.59 |
| LTC3838IUHF#TRPBF | 5x7 QFN-38 | I | $3.65 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC1626A-A | LTC3838EFE Demo Board (DCR Sense) | 4.5V ≤ VIN ≤ 26V; VOUT1 = 1.2V @ 15A, VOUT2 = 1.5V @ 15A | $150.00 |
| DC1626A-B | LTC3838EFE Demo Board (RSENSE) |4.5V ≤ VIN ≤ 26V; VOUT1 = 1.2V @ 15A, VOUT2 = 1.5V @ 15A | $150.00 |
| DC1801A-A | LTC3838EUHF Demo Board (DCR Sense) | VIN = 4.5V to 14V, VOUT1 = 1.2V @ 20A, VOUT2 = 1.5V @ 20A | $150.00 |
| DC1801A-B | LTC3838EUHF Demo Board (RSENSE) | VIN = 4.5V to 14V, VOUT1 = 1.2V @ 20A, VOUT2 = 1.5V @ 20A | $150.00 |
- Other
- LTC3838 Package Drawing LTC3838
- AN149 - 开关模式电源的建模和环路补偿设计
- 双输出同步降压型控制器在 2MHz 频率下以高达 24VIN 产生 1.5VOUT
- LTC3838 Project - Dual, Fast, Accrate Step-Down DC/DC Converter with Inductor DCR Current Sensing (4.5-26V to 1.2V @ 15A & 1.5V & 15A)
- LTC3838 Demo Circuit - Wide Input Range, High Efficiency Step-Down DC/DC Converter with Rsense Current Sensing (4.5-26V to 1.2V @ 15A & 1.5V @ 15A)
- LTC3838 Project - Dual, Fast, Accrate Step-Down DC/DC Converter with Rsense Current Sensing (4.5-26V to 1.2V @ 15A & 1.5V & 15A)
- LTC3838 Project - Dual, Fast, Accrate Step-Down DC/DC Converter with Inductor DCR Current Sensing (4.5-14V to 1.2V @ 20A & 1.5V @ 20A)
- LTC3838 Project - Dual, Fast, Accrate Step-Down DC/DC Converter with Rsense Current Sensing (4.5-14V to 1.2V @ 20A & 1.5V @ 20A)
- LTC3838 Demo Circuit - Wide Input Range, High Efficiency Step-Down DC/DC Converter with Inductor DCR Current Sensing (4.5-26V to 1.2V @ 15A & 1.5V & 15A)
- LTC3838 Footprints and Symbols
- 2MHz Dual DC/DC Controller Halves Settling Time of Load Release Transients, Features 0.67% Differential VOUT Accuracy and Is Primed for High Step-Down Ratios
- Dual, Fast, Step-Down Controller’s External Reference Input Enables Dynamic Voltage Scaling from 0.4V to 5.5V and 0.3% Total Combined Regulation Accuracy
- R526 - Reliability Data
- DN505 - 双通道控制器可为 1.5V 电压轨提供 2μs 阶跃响应和 92% 效率
