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NR263S Datasheet Preview

NR263S Datasheet

Buck Converter

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Light Load High Efficiency
Synchronous Rectification Buck Converter IC
NR263S
Data Sheet
Description
The NR263S is synchronous rectification buck
converter IC with built-in power MOSFET. In light load,
the IC operates with the pulse skip mode to improve the
efficiency. By using the peak current control method, the
IC stably operates with a low ESR capacitor such as a
ceramic capacitor. The IC has the various protections
such as the overcurrent protection, the undervoltage
lockout, and the thermal shutdown.
The IC achieves the switching regulator circuit with
few components and small mounting area.
Features
Synchronous Rectification
Operation Modes:
Normal Load: Current Mode PWM Control
Light Load: Pulse Skip Operation
Maximum Efficiency (VIN = 12 V, VOUT = 5 V)
Normal Load: 94%
Light Load (IOUT = 10 mA): 86%
Stable with a Low ESR Ceramic Output Capacitor
Few External Component Counts
(Fixed Output Voltage of 5 V)
Soft-start Period Adjustment by External Capacitor
Enable Function
Protections:
Overcurrent Protection (OCP): Drooping Type,
Auto-restart
Thermal Shutdown (TSD): Auto-restart
Undervoltage Lockout (UVLO)
Output Short Circuit Protection: Burst Oscillation
Operation (Hiccup)
Package
SOP8
Not to scale
Specifications
Input Voltage, VIN: 8.0 V to 31 V
Fixed Output Voltage, VOUT: 5 V
Output Current, IOUT: 1 A
Fixed Operating Frequency: 500 kHz
Applications
White Goods
Audio Visual Equipment
Office Automation Equipment
Other Switched Mode Power Supply (SMPS)
Typical Application
VIN
REN
8 7 65
CIN
NR263S
1 23 4
L
CSS
CBS
VOUT
COUT
NR263S-DSE Rev.2.3
SANKEN ELECTRIC CO., LTD
1
Aug. 23, 2018
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015




SANKEN

NR263S Datasheet Preview

NR263S Datasheet

Buck Converter

No Preview Available !

NR263S
Contents
Description ------------------------------------------------------------------------------------------------------ 1
Contents --------------------------------------------------------------------------------------------------------- 2
1. Absolute Maximum Ratings----------------------------------------------------------------------------- 3
2. Recommended Operating Conditions ----------------------------------------------------------------- 3
3. Electrical Characteristics -------------------------------------------------------------------------------- 4
4. Block Diagram --------------------------------------------------------------------------------------------- 5
5. Pin Configuration Definitions--------------------------------------------------------------------------- 5
6. Typical Application --------------------------------------------------------------------------------------- 6
7. Physical Dimensions -------------------------------------------------------------------------------------- 7
8. Marking Diagram ----------------------------------------------------------------------------------------- 8
9. Operational Descriptions -------------------------------------------------------------------------------- 8
9.1 PWM Output Control ------------------------------------------------------------------------------ 9
9.2 Enable Function ------------------------------------------------------------------------------------- 9
9.3 Soft-start Function ---------------------------------------------------------------------------------- 9
9.4 Thermal Shutdown-------------------------------------------------------------------------------- 10
9.5 Overcurrent Protection and Output Short Circuit Protection --------------------------- 11
9.6 Pulse Skip Mode ----------------------------------------------------------------------------------- 12
10. Design Notes ---------------------------------------------------------------------------------------------- 13
10.1 Thermal Derating --------------------------------------------------------------------------------- 13
10.2 External Components ---------------------------------------------------------------------------- 13
10.2.1 Inductor --------------------------------------------------------------------------------------- 13
10.2.2 Input/Output Capacitor-------------------------------------------------------------------- 14
10.3 Spike Noise Reduction Methods ---------------------------------------------------------------- 15
10.4 For Applications Where Output Voltage Is Higher than Input Voltage --------------- 15
10.5 For Applications Inserting/Removing Load Wire in Power Supply Operation ------- 15
10.6 PCB Layout----------------------------------------------------------------------------------------- 16
10.7 Using Bead-core ----------------------------------------------------------------------------------- 16
11. Pattern Layout Example ------------------------------------------------------------------------------- 17
12. Typical Characteristics--------------------------------------------------------------------------------- 19
Important Notes---------------------------------------------------------------------------------------------- 21
NR263S-DSE Rev.2.3
SANKEN ELECTRIC CO., LTD
2
Aug. 23, 2018
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015


Part Number NR263S
Description Buck Converter
Maker SANKEN
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