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Regulator. SY8113B Datasheet |
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Application Note: SY8113B
High Efficiency, 500kHz, 3A, 18V Input
Synchronous Step Down Regulator
General Description
The SY8113B is a high efficiency 500 kHz
synchronous step-down DC-DC converter capable of
delivering 3A current. The SY8113B 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.
Low output voltage ripple and small external inductor
and capacitor sizes are achieved with 500 kHz
switching frequency. It adopts the instant PWM
architecture to achieve fast transient responses for high
step down applications
Ordering Information
SY8113 □(□□)□
Temperature Code
Package Code
Optional Spec Code
Temperature Range: -40°C to 85°C
Ordering Number
SY8113BADC
Package type
TSOT23-6
Note
--
Features
• low RDS(ON) for internal switches (top/bottom):
80mΩ/40mΩ
• 4.5-18V input voltage range
• 3A output current capability
• 500 kHz switching frequency
• Instant PWM architecture to achieve fast transient
responses.
• Cycle-by-cycle peak current limitation
• Internal softstart limits the inrush current
• ±1.5% 0.6V reference
• TSOT23-6 package
Applications
• Set Top Box
• Portable TV
• Access Point Router
• DSL Modem
• LCD TV
Typical Applications
Figure 1. Schematic Diagram
Figure 2. Efficiency Figure
AN_SY8113B Rev.0.1
Silergy Corp. Confidential-prepared for Internal Use Only 1
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Pinout (top view)
AN_SY8113B
BS LX
GND
IN
FB EN
TSOT23-6(FC)
Top Mark: WCxyz, (Device code: WC, x=year code, y=week code, z= lot number code)
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
Enable Voltage---------------------------------------------------------------------------------------------- VIN + 0.3V
FB Voltage ----------------------------------------------------------------------------------------------------------- 4V
Power Dissipation, PD @ TA = 25°C, TSOT23-6（FC）----------------------------------------------------- 1W
Package Thermal Resistance (Note 2)
θ JA ------------------------------------------------------------------------------------------------------ 100°C /W
θ JC ----------------------------------------------------------------------------------------------------- 11.2°C /W
Junction Temperature Range ----------------------------------------------------------------------------------- 150°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_SY8113B Rev.0.1
Silergy Corp. Confidential-prepared for Internal Use Only 2
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