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The LT8609S is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 1.7µA of non-switching quiescent current .The LT8609S can deliver 2A of continuous current with peak loads of 3A (<1sec) to support applications such as GSM transceivers which require high transient loads. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mVP-P. A SYNC pin allows synchronization to an external clock, or spread spectrum modulation of switching frequencies for low EMI operation. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability.
The EN/UV pin has an accurate 1V threshold and can be used to program VIN undervoltage lockout or to shut down the LT8609S reducing the input supply current to 1µA. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up while the PG flag signals when VOUT is within ±8.5% of the programmed output voltage as well as fault conditions. The LT8609S is available in a small 16-lead 3mm×3mm LQFN package.
Figure: PCB Symbol
Figure: Footprint
Figure: 3D Model
Figure: Pin Configuration
Figure: Block Diagram
- Ultralow EMI Emissions on Any PCB
- Eliminates PCB Layout Sensitivity
- Internal Bypass Capacitors Reduce Radiated EMI
- Optional Spread Spectrum Modulation
- <2.5µA IQ Regulating 12VIN to 3.3VOUT
- Output Ripple <10mVP-P
- >93% Efficiency at 1A, 12VIN to 5VOUT
Figure: Typical Application
You can download the datasheet from the link given below.
| Product Category: | Switching Voltage Regulators |
| Mounting Style: | SMD/SMT |
| Package / Case: | QFN-16 |
| Topology: | Buck |
| Output Voltage: | Adjustable |
| Output Current: | 2 A |
| Number of Outputs: | 1 Output |
| Input Voltage MAX: | 42 V |
| Input Voltage MIN: | 3 V |
| Quiescent Current: | 2.5 uA |
| Switching Frequency: | 200 kHz to 2.2 MHz |
| Minimum Operating Temperature: | - 40 ℃ |
| Maximum Operating Temperature: | + 125 ℃ |
| Series: | LT8609 |
| Packaging: | Tray |
| Manufacturer: | Analog Devices Inc. |
| Brand: | Analog Devices |
| Input Voltage: | 3 V to 42 V |
| Moisture Sensitive: | Yes |
| Product Type: | Switching Voltage Regulators |
| Shutdown: | No Shutdown |
| Factory Pack Quantity: | 624 |
| Subcategory: | PMIC - Power Management ICs |
| Supply Voltage - Min: | 3 V |
| Type: | Synchronous Step-Down Regulator |
| Unit Weight: | 0.047131 oz |
Analog Devices, Inc. (ADI), also known simply as Analog, is an American multinational semiconductor company specializing in data conversion, signal processing and power management technology, headquartered in Wilmington, Massachusetts.
Note: Please check their parameters and pin configuration before replacing them in your circuit.
Switch-mode regulators are used in devices like portable phones, video game platforms, robots, digital cameras, and your computer. Switching regulators are complex circuits to design, and as a result they aren't very popular with hobbyists.
Switching regulators are efficient because the series element is either fully conducting or switched off so it dissipates almost no power. Switching regulators are able to generate output voltages that are higher than the input voltage or of opposite polarity, unlike linear regulators.
As shown in the drawing below, a switching regulator outputs the desired DC voltage by converting an input voltage (VIN) to a pulse by alternately switching SW1 on input voltage side (VIN) and SW2 on GND side ON / OFF and removing the AC components using an LC filter.
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