SY8089/8089A

Part: SY8089/SY8089A from Silergy Corp.

Type: Synchronous Step Down Regulator

Description: High-efficiency, high-frequency synchronous step-down DC-DC regulator IC capable of delivering up to 2A continuous (3A peak) output current with a 2.7V to 5.5V input voltage range and 1MHz switching frequency.

Operating Conditions:

• Supply voltage: 2.7V to 5.5V
• Operating ambient temperature: -40°C to 85°C
• Operating junction temperature: -40°C to 125°C
• Switching frequency: 1 MHz (Typ)

Absolute Maximum Ratings:

• Max supply input voltage: 6.0V
• Max continuous current: 3.5A (PFET Current Limit)
• Max junction/storage temperature: 150°C

Key Specs:

• Input Voltage Range: 2.7V to 5.5V
• Quiescent Current (IOUT=0, VFB=VREF ⋅ 105%): 55 μA (Typ)
• Shutdown Current (EN=0): 0.1 μA (Typ), 1 μA (Max)
• Feedback Reference Voltage: 0.588V (Min), 0.6V (Typ), 0.612V (Max)
• PFET RON: 110 mΩ (Typ)
• NFET RON: 80 mΩ (Typ)
• Oscillator Frequency (IOUT=500mA): 1 MHz (Typ)
• Thermal Shutdown Temperature: 160 °C (Typ)

Features:

• Low RDS(ON) for internal switches (top/bottom): 110m Ω /80m Ω
• 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-Notebook PC
• Access Point Router

Package:

• SOT23-5

The SY8089 and SY8089A are high-efficiency, high frequency synchronous step-down DC-DC regulator IC capable of delivering up to 2A output current. The SY8089 and SY8089A operate over a wide input voltage range from 2.7V to 5.5V and integrate main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. Low output voltage ripple and small external inductor and capacitor sizes are achieved with greater than 1MHz switching frequency. SY8089 integrates short circuit and over-voltage latch off protection. Ordering Information Package Code Temperature Code Optional Spec Code □ ( □□ ) □ SY8089 Package Code Temperature Code Optional Spec Code □ ( □□ ) □ SY8089 · Low RDS(ON) for internal switches (top/bottom):110m Ω /80m Ω · 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-Notebook PC · Access Point Router Typical Applications Figure 1.Schematic diagram Figure 2. Efficiency vs Load Current Silergy Corp. Confidential-Prepared for Rockchip www.ChipSPARK.com

(VIN = 5V, VOUT = 2.5V, L = 2.2μH, COUT = 22μF, TA = 25°C, unless otherwise specified)

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. Silergy Corp. Confidential-Prepared for Rockchip

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