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Application Note: AN_SY8120B
High Efficiency Fast Response, 2A, 18V Input Synchronous Step Down Regul...
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Application Note: AN_SY8120B
High Efficiency Fast Response, 2A, 18V Input Synchronous Step Down
Regulator
General Description
SY8120B develops high efficiency synchronous stepdown DC-DC converter capable of delivering 2A load current . SY8120B operates over a wide input voltage range from 4.5V to 18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.
SY8120B adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates under heavy load conditions to minimize the size of inductor and capacitor.
Ordering Information
SY8120 ( ) Temperature Code Package Code Optional Spec Code
Temperature Range: -40°C to 85°C
Ordering Number Package type Note
SY8120BABC
SOT23-6
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Features
Low RDS(ON) for internal switches (top/bottom):145/135 m 4.5-18V input voltage range 2A load current capability Instant PWM architecture to achieve fast transient responses Internal softstart limits the inrush current 2% 0.6V reference RoHS Compliant and Halogen Free Compact package: SOT23-6
Applications
Set Top Box Portable TV Access Point Router DSL Modem LCD TV
Typical Applications
Figure 1. Schematic Diagram
AN_SY8120B Rev.0.2
Figure 2. Efficiency Figure
1
Pinout (top view)
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AN_SY8120B
(SOT23-6) Top Mark: NB , (Device code: NB,
)
Pin Name BS GND
FB
EN IN LX
Pin Number 1 2
3
4 5 6
Pin Description Bo...