Buck Converter. NR263S Datasheet

NR263S Converter. Datasheet pdf. Equivalent

NR263S Datasheet
Recommendation NR263S Datasheet
Part NR263S
Description Buck Converter
Feature NR263S; Light Load High Efficiency Synchronous Rectification Buck Converter IC NR263S Data Sheet Descripti.
Manufacture SANKEN
Datasheet
Download NR263S Datasheet





SANKEN NR263S
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
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



SANKEN NR263S
NR263S
1. Absolute Maximum Ratings
Current polarities are defined as follows: current going into the IC (sinking) is positive current (+); current coming
out of the IC (sourcing) is negative current (−).
Unless otherwise specified, TA = 25 °C.
Parameter
Symbol
Conditions
Ratings
Unit
Input Voltage
BS Pin Voltage
Voltage between BS and
SW Pins
VIN
VBS
VBS-SW
DC
Pulse width 10 ns
0.3 to 35
V
0.3 to 40.5
V
0.3 to 5.5
V
8
V
DC
1 to 35
SW Pin Voltage
VSW Pulse width 100 ns
Pulse width 10 ns
2 to 35
V
6 to 35
VO Pin Voltage
VO
EN Pin Voltage
VEN
SS Pin Voltage
VSS
SS Pin Sink Current
Power Dissipation(1)
Junction Temperature(2)
ISSB
Mounted on the board (see
PD Section 11),
TJ = 150 °C
TJ
Storage Temperature
Tstg
Junction-to-Lead(3)
Thermal Resistance
θJ-L
Junction-to-Ambient
Thermal Resistance
θJ-A
Mounted on the board
(see Section 11)
(1) Limited by thermal shutdown.
(2) The temperature detection of thermal shutdown is about 165 °C.
(3) The lead temperature is measured at pin 4.
0.3 to 6
0.3 to 35
0.3 to 7.0
5.0
1.56
40 to 150
40 to 150
60
80
V
V
V
mA
W
°C
°C
°C/W
°C/W
2. Recommended Operating Conditions
Parameter
Symbol
Conditions
Input Voltage
VIN
Output Current*
IOUT L = 6.8 μH
Operating Ambient Temperature*
TA
Operating Junction Temperature*
TJ
* Must be used in the range of thermal derating (see Section 10.1).
Min.
Max.
Unit
8
31
V
0
1.0
A
40
85
°C
40
125
°C
NR263S-DSE Rev.2.3
SANKEN ELECTRIC CO., LTD
3
Aug. 23, 2018
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015





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