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SY8120B Datasheet Preview

SY8120B Datasheet

Synchronous Step Down Regulator

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昱灿电子 www.szyucan.com 
Application Note: AN_SY8120B
High Efficiency Fast Response, 2A, 18V Input
Synchronous Step Down Regulator
General Description
SY8120B develops high efficiency synchronous step-
down 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
--
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




Silergy

SY8120B Datasheet Preview

SY8120B Datasheet

Synchronous Step Down Regulator

No Preview Available !

Pinout (top view)
昱灿电子 www.szyucan.com 
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
Boot-Strap Pin. Supply high side gate driver. Decouple this pin to LX pin with
0.1uF ceramic cap.
Ground pin
Output Feedback Pin. Connect this pin to the center point of the output resistor
divider (as shown in Figure 1) to program the output voltage:
Vout=0.6*(1+R1/R2)
Enable control. Pull high to turn on. Do not float.
Input pin. Decouple this pin to GND pin with at least 1uF ceramic cap
Inductor pin. Connect this pin to the switching node of inductor
Absolute Maximum Ratings (Note 1)
Supply Input Voltage ----------------------------------------------------------------------------------------- 19V
LX, EN Voltage------------------------------------------------------------------------------------------------ VIN + 0.3V
FB, BS-LX Voltage--------------------------------------------------------------------------------------------- 4V
Power Dissipation, PD @ TA = 25°C SOT23-6, ----------------------------------------------------------- 0.6W
Package Thermal Resistance (Note 2)
JA ---------------------------------------------------------------------------------------------------- 170°C/W
JC ---------------------------------------------------------------------------------------------------- 130°C/W
Junction Temperature Range -------------------------------------------------------------------------------- 125°C
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------- -65°C to 150°C
Recommended Operating Conditions (Note 3)
Supply Input Voltage ----------------------------------------------------------------------------------------- 4.5V to 18V
Junction Temperature Range -------------------------------------------------------------------------------- -40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------- -40°C to 85°C
AN_SY8120B Rev.0.2
2


Part Number SY8120B
Description Synchronous Step Down Regulator
Maker Silergy
Total Page 9 Pages
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