SY8089AAC
Application Note: AN\_SY8089/SY8089A
Manufacturer
unknown
Overview
Part: SY8089/SY8089A
Type: Synchronous Step-Down DC-DC Regulator
Key Specs:
- Input Voltage Range: 2.7V to 5.5V
- Continuous Output Current: 2A
- Peak Output Current: 3A
- Switching Frequency: 1MHz
- Top Switch R_DS(ON): 110mΩ
- Bottom Switch R_DS(ON): 80mΩ
Features:
- Low R_DS(ON) for internal switches (top/bottom): 110mΩ /80mΩ
- 2.7-5.5V input voltage range
- 2A continuous, 3A peak load current capability
- 1MHz switching frequency minimizes the external components
- Internal softstart limits the inrush current
- Reliable short circuit protection: SY8089: Latch off protection; SY8089A: Hic-cup mode protection
- Reliable over-voltage protection: SY8089: Latch off protection; SY8089A: No latch off protection
- 100% dropout operation
- RoHS Compliant and Halogen Free
- Compact package: SOT23-5
Applications:
- LCD TV
- Set Top Box
- Net PC
- Mini
Features
- Low $R_{DS(ON)}$ for internal switches (top/bottom):110m $\Omega$ /80m $\Omega$
- 2.7-5.5V input voltage range
- 2A continuous, 3A peak load current capability
- 1MHz switching frequency minimizes the external components
- Internal softstart limits the inrush current
- Reliable short circuit protection:
- O SY8089: Latch off protection
- O SY8089A: Hic-cup mode protection
- Reliable over-voltage protection:
- O SY8089: Latch off protection
- O SY8089A: No latch off protection
- 100% dropout operation
- RoHS Compliant and Halogen Free
- Compact package: SOT23-5
Applications
- LCD TV
- Set Top Box
- Net PC
- Mini-Notebook PC
- Access Point Router
Electrical Characteristics
$(V_{IN}=5V,,V_{OUT}=2.5V,,L=2.2\mu H,,C_{OUT}=22\mu F,,T_{A}=25^{\circ}C,,unless,,otherwise,,specified)$
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Input Voltage Range | V IN | 2.7 | 5.5 | V | ||
| Quiescent Current | $I_Q$ | IOUT=0, | 55 | μA | ||
| VFB=VREF · 105% | $\mathcal{Q}$ | |||||
| Shutdown Current | $I_{SHDN}$ | EN=0 | 0.1 | NY | μA | |
| Feedback Reference Voltage | $V_{REF}$ | 0.588 | 0.6 | 0.612 | V | |
| FB Input Current | $I_{FB}$ | VFB=VIN | -50 | 50 | nA | |
| PFET RON | $R_{DS(ON),P}$ | 110 | $m\Omega$ | |||
| NFET RON | $R_{DS(ON),N}$ | 80 | $m\Omega$ | |||
| PFET Current Limit | $I_{LIM}$ | 3.5 | ) | A | ||
| EN rising threshold | $V_{ENH}$ | _ | 1.5 | V | ||
| EN falling threshold | $V_{\mathrm{ENL}}$ | × | 0.4 | V | ||
| Input UVLO threshold | $V_{\rm UVLO}$ | y | 2.5 | V | ||
| UVLO hysteresis | $V_{HYS}$ | 0.2 | V | |||
| Oscillator Frequency | Fosc | IOUT=500mA | 1 | MHz | ||
| Short Circuit Protection Latch Off | V SCP | 0.25 | V | |||
| Threshold | ||||||
| Min ON Time | 75 | ns | ||||
| Max Duty Cycle | 100 | % | ||||
| Soft Start Time | $T_{SS}$ | 1.2 | ms | |||
| Output Discharge Switch On | R DISCH | 70 | 50 | Ω | ||
| Resistance | ||||||
| Thermal Shutdown Temperature | $T_{SD}$ | · · | 160 | °C |
Note 1: Stresses beyond the "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Note 2: Test condition: Device mounted on 2" x 2" FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane.
Note 3: The device is not guaranteed to function outside its operating conditions.
Absolute Maximum Ratings
| Supply Input Voltage | 9 | 0.3V to 6.0V |
|---|---|---|
| Enable, FB Voltage | Y | $-0.3V$ to $V_{IN} + 0.6V$ |
| Power Dissipation, PD @ TA = 25°C, | ||
| SOT23-5 | 0.6W | |
| Package Thermal Resistance (Note 2) | ||
| θ JA | 170°C/W | |
| θ JC | 130°C/W | |
| Junction Temperature Range | 40°C to 150°C | |
| Lead Temperature (Soldering, 10 sec.) | 260°C | |
| Storage Temperature Range | 65°C to 150°C |
Recommended Operating Conditions
| Supply input voltage | 2.7 v to 3.5 v | |
|---|---|---|
| Junction Temperature Range - | 4 | |
| ranction remperature range | * | 10 0 10 125 0 |
| Ambient Temperature Range | ||
Block Diagram
Electrical Characteristics
$(V_{IN}=5V,,V_{OUT}=2.5V,,L=2.2\mu H,,C_{OUT}=22\mu F,,T_{A}=25^{\circ}C,,unless,,otherwise,,specified)$
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Input Voltage Range | V IN | 2.7 | 5.5 | V | ||
| Quiescent Current | $I_Q$ | IOUT=0, | 55 | μA | ||
| VFB=VREF · 105% | $\mathcal{Q}$ | |||||
| Shutdown Current | $I_{SHDN}$ | EN=0 | 0.1 | NY | μA | |
| Feedback Reference Voltage | $V_{REF}$ | 0.588 | 0.6 | 0.612 | V | |
| FB Input Current | $I_{FB}$ | VFB=VIN | -50 | 50 | nA | |
| PFET RON | $R_{DS(ON),P}$ | 110 | $m\Omega$ | |||
| NFET RON | $R_{DS(ON),N}$ | 80 | $m\Omega$ | |||
| PFET Current Limit | $I_{LIM}$ | 3.5 | ) | A | ||
| EN rising threshold | $V_{ENH}$ | _ | 1.5 | V | ||
| EN falling threshold | $V_{\mathrm{ENL}}$ | × | 0.4 | V | ||
| Input UVLO threshold | $V_{\rm UVLO}$ | y | 2.5 | V | ||
| UVLO hysteresis | $V_{HYS}$ | 0.2 | V | |||
| Oscillator Frequency | Fosc | IOUT=500mA | 1 | MHz | ||
| Short Circuit Protection Latch Off | V SCP | 0.25 | V | |||
| Threshold | ||||||
| Min ON Time | 75 | ns | ||||
| Max Duty Cycle | 100 | % | ||||
| Soft Start Time | $T_{SS}$ | 1.2 | ms | |||
| Output Discharge Switch On | R DISCH | 70 | 50 | Ω | ||
| Resistance | ||||||
| Thermal Shutdown Temperature | $T_{SD}$ | · · | 160 | °C |
Note 1: Stresses beyond the "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Note 2: Test condition: Device mounted on 2" x 2" FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane.
Note 3: The device is not guaranteed to function outside its operating conditions.
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