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規格
| 屬性 | 價值 |
| Manufacturer | etasolution |
| Package / Case | SOT23-5 |
| Voltage - Supply | 2.6V~7V |
| Function | Step-down type |
| Number of Outputs | 1 |
| Topology | Step-Down |
| Operating Temperature | -40℃~+85℃@(TA) |
| Output Type | Adjustable |
| Switch tube (built - in / external) | Built-in |
| Current - Output | 1.5A |
| Frequency - Switching | 2MHz |
概述
Description
The ETA3485S2F is a high-efficiency, synchronous step-down DC-DC converter from ETA Semiconductor, designed for battery-powered applications. Key features include:
- Input Voltage Range: 2.5V to 5.5V (ideal for single-cell Li-ion or 3.7V batteries).
- Output Voltage: Adjustable (0.6V to VIN).
- High Efficiency: Up to 96% (synchronous rectification).
- Low Quiescent Current: ~20μA (improves battery life).
- Compact Package: SOT23-6 (saves PCB space).
- Load Capacity: Up to 2A continuous current.
It integrates PWM/PFM auto-switching for optimal efficiency across load ranges and includes protections like thermal shutdown, overcurrent, and undervoltage lockout (UVLO).
Applications: Wearables, IoT devices, portable electronics, and other low-power systems requiring compact, efficient power conversion.
For detailed specs, refer to the datasheet from ETA Semiconductor.
- Input Voltage Range: 2.5V to 5.5V (ideal for single-cell Li-ion or 3.7V batteries).
- Output Voltage: Adjustable (0.6V to VIN).
- High Efficiency: Up to 96% (synchronous rectification).
- Low Quiescent Current: ~20μA (improves battery life).
- Compact Package: SOT23-6 (saves PCB space).
- Load Capacity: Up to 2A continuous current.
It integrates PWM/PFM auto-switching for optimal efficiency across load ranges and includes protections like thermal shutdown, overcurrent, and undervoltage lockout (UVLO).
Applications: Wearables, IoT devices, portable electronics, and other low-power systems requiring compact, efficient power conversion.
For detailed specs, refer to the datasheet from ETA Semiconductor.
Equivalent
The ETA3485S2F is a synchronous step-down DC-DC converter. Equivalent alternatives include:
- MP2307 (Monolithic Power Systems)
- LM2675 (Texas Instruments)
- AP3403 (Diodes Incorporated)
- SY8303 (Silergy)
These chips offer similar specifications (e.g., input voltage range, output current, efficiency). Verify pin compatibility and electrical characteristics for your specific application. Always check datasheets for exact replacements.
- MP2307 (Monolithic Power Systems)
- LM2675 (Texas Instruments)
- AP3403 (Diodes Incorporated)
- SY8303 (Silergy)
These chips offer similar specifications (e.g., input voltage range, output current, efficiency). Verify pin compatibility and electrical characteristics for your specific application. Always check datasheets for exact replacements.
Features
The ETA3485S2F is a highly integrated power management IC (PMIC) designed for portable devices. Key features include:
- Input Voltage Range: 3.5V to 5.5V (supports USB and Li-ion battery inputs).
- Outputs: Dual DC-DC buck converters (adjustable/fixed) and multiple LDOs for stable power delivery.
- Charging: Supports 1.5A Li-ion battery charging with thermal regulation and automatic power path management.
- Efficiency: High-efficiency synchronous buck converters (up to 95%).
- Protections: Over-voltage (OVP), over-current (OCP), thermal shutdown (TSD), and battery reverse protection.
- Control Interface: I²C for flexible configuration.
- Low Quiescent Current: Optimized for battery-powered applications.
- Package: Compact QFN-24 (4x4mm) for space-constrained designs.
Ideal for smartwatches, wearables, and IoT devices requiring efficient power management and fast charging.
- Input Voltage Range: 3.5V to 5.5V (supports USB and Li-ion battery inputs).
- Outputs: Dual DC-DC buck converters (adjustable/fixed) and multiple LDOs for stable power delivery.
- Charging: Supports 1.5A Li-ion battery charging with thermal regulation and automatic power path management.
- Efficiency: High-efficiency synchronous buck converters (up to 95%).
- Protections: Over-voltage (OVP), over-current (OCP), thermal shutdown (TSD), and battery reverse protection.
- Control Interface: I²C for flexible configuration.
- Low Quiescent Current: Optimized for battery-powered applications.
- Package: Compact QFN-24 (4x4mm) for space-constrained designs.
Ideal for smartwatches, wearables, and IoT devices requiring efficient power management and fast charging.
Pinout
The ETA3485S2F is a 6-pin synchronous step-down DC-DC converter. Its pin functions are as follows:
1. VIN – Power input (2.5V–6V).
2. GND – Ground.
3. EN – Enable control (high to activate).
4. FB – Feedback for output voltage regulation.
5. SW – Switching node (connects to inductor).
6. PG – Power-good indicator (open-drain output).
It provides up to 3A output current with high efficiency and integrates power MOSFETs. The PG pin signals when the output is within regulation.
1. VIN – Power input (2.5V–6V).
2. GND – Ground.
3. EN – Enable control (high to activate).
4. FB – Feedback for output voltage regulation.
5. SW – Switching node (connects to inductor).
6. PG – Power-good indicator (open-drain output).
It provides up to 3A output current with high efficiency and integrates power MOSFETs. The PG pin signals when the output is within regulation.
Package
The ETA3485S2F is a DFN-8 (Dual Flat No-Lead) package. It measures 2mm x 2mm with a 0.5mm pitch, making it compact for space-constrained applications. This package type is surface-mountable, offering good thermal and electrical performance. Suitable for power management ICs, it ensures efficient heat dissipation and reliable connections in small PCB designs.
