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SY8120B1 Datasheet

Synchronous Step Down Regulator

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Application Note: SY8120B1
High Efficiency Fast Response, 2A, 18V Input
Synchronous Step Down Regulator
General Description
SY8120B1 develops high efficiency synchronous step-
down DC-DC converter capable of delivering 2A load
current . SY8120B1 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.
SY8120B1 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 at pseudo-constant frequency of
500 kHz 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
Low RDS(ON) for internal switches
(top/bottom):130/120 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
Cycle-by-cycle peak current limitation
RoHS Compliant and Halogen Free
Compact package: SOT23-6
Set Top Box
Portable TV
Access Point Router
DSL Modem
Typical Applications
Figure 1. Schematic Diagram
Figure 2. Efficiency Figure
AN_SY8120B1 Rev.0.9
Silergy Corp. Confidential-prepared for Internal Use Only 1

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