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Analog Devices LTC7811 | Demoboard DC3151A
LTC7811 | Triple Output Step-Up/Dual Step-Down Power Supply
Overview
| Topology | Boost Converter |
| Input voltage | 4.5-36 V |
| Output 1 | 9.5 V / 7 A |
Description
Demonstration circuit DC3151A is a non-synchronous boost plus dual synchronous buck power supply featuring the LTC7811. The demonstration circuit is designed for two buck outputs 5V/10A, 3.3V/7A supplied by a boosted 9.5V output. Benefiting from this feature, the buck outputs can maintain regulation over a wide input voltage range of 4.5V to 36V which is suitable for automotive or other battery fed applications. Also, the demonstration circuit uses a drop-in layout whereas the main buck circuit components fit in an area of ¾" by 1½", while the main boost circuit area is ¾" by 1¾". The package style for the LTC7811 is a 40-pin exposed pad QFN.The main features of the board include rail tracking (Buck channels only), an internal 5V linear regulator for bias, separate RUN pins for each output, a PGOOD signal (CH1 only), battery monitor and a Mode selector that allow the converter to run in CCM, Pulse-skipping or Burst Mode operation. Spread Spectrum Mode is available for EMI improvement. Synchronization to an external clock is also possible.The LTC7811 datasheet gives a complete description of this part, its operation and application information. The datasheet must be read in conjunction with the quick start guide for demo circuit 3151.
Features
- Dual Synchronous Buck Plus Single Boost Controllers
- Low Operating IQ:
- 14μA (14V to 3.3V, Channel 1 On)
- Outputs Remain in Regulation Through Cold Crank Down to 1V Input Supply Voltage
- Wide Bias Input Voltage Range: 4.5V to 40V
- Buck Output Voltages Up to 40V
- Boost Output Voltage Limited Only by External Components
- Spread Spectrum Operation
- RSENSE or DCR Current Sensing
- Low Battery Indicator for Automotive Applications
- Programmable Fixed Frequency (100kHz to 3MHz)
- Phase-Lockable Frequency (100kHz to 3MHz)
- Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode® Operation at Light Loads
- Boost Channel Current Monitor Output
- Low Shutdown IQ: 1.5μA
- Small 40-Lead 6mm × 6mm QFN Package
- AEC-Q100 Qualified for Automotive Applications
Typical applications
- Industrial
- Military/Avionics
- Automotive and Transportation
More information
Products
| Order Code | Datasheet | Downloads | Status | Product series | L (mm) | f (mm) | Pins (Value) (pcs) | Rows | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 62000311121 | SPEC | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Pin Header | 6 | – | 3 | Single | Pin Header | Straight | 2 | Bag | |
 | 62000621121 | SPEC | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Dual Pin Header | 6 | – | 6 | Dual | Pin Header | Straight | 2 | Bag | |
 | 702935000 | SPEC | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WA-SNSR Self-Retaining Spacer | 12.7 | 4.8 | – | – | – | – | – | – | |
 | 60800213421 | SPEC | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm Jumper with Test Point | – | – | 2 | – | Jumper | – | 3 | Bag |
| Order Code | Datasheet | |
|---|---|---|
| 62000311121 | SPEC |
| 62000621121 | SPEC |
| 702935000 | SPEC |
| 60800213421 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Downloads | Status | Product series | L (mm) | f (mm) | Pins (Value) (pcs) | Rows | Gender | Type | IR (A) | Packaging | Samples |
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