Buck Converter. NR264S Datasheet

NR264S Converter. Datasheet pdf. Equivalent

NR264S Datasheet
Recommendation NR264S Datasheet
Part NR264S
Description Buck Converter
Feature NR264S; Light Load High Efficiency Synchronous Rectification Buck Converter IC NR264S Data Sheet Descripti.
Manufacture SANKEN
Datasheet
Download NR264S Datasheet




SANKEN NR264S
Light Load High Efficiency
Synchronous Rectification Buck Converter IC
NR264S
Data Sheet
Description
The NR264S 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
Soft-start Period Adjustment by External Capacitor
Enable Function
Frequency Limitation Function (Pulse Skip Frequency
in Light Load is Limited to 28 kHz)
Protections:
Overcurrent Protection (OCP): Drooping Type, Auto-
restart
Thermal Shutdown (TSD): Auto-restart
Undervoltage Lockout (UVLO)
Output Short Circuit Protection: Burst Oscillation
Operation (Hiccup)
Typical Application
Package
SOP8
Not to scale
Specifications
Input Voltage, VIN: 8.0 V to 31 V
Output Voltage, VOUT: 3 V to 18 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)
VIN
CIN
NR264S
IN
5
GND
4
EN
6
SW 3
7 FB
8 COMP
BS
2 CBS
SS 1 CSS
L
RFB1
VOUT
COUT
CP RS
CS
RFB2
NR264S-DSE Rev.1.7
SANKEN ELECTRIC CO., LTD
1
Mar. 11, 2019
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015



SANKEN NR264S
NR264S
Contents
Description ------------------------------------------------------------------------------------------------------ 1
Contents --------------------------------------------------------------------------------------------------------- 2
1. Absolute Maximum Ratings----------------------------------------------------------------------------- 3
2. Recommended Operating Conditions ----------------------------------------------------------------- 4
3. Electrical Characteristics -------------------------------------------------------------------------------- 5
4. Block Diagram --------------------------------------------------------------------------------------------- 6
5. Pin Configuration Definitions--------------------------------------------------------------------------- 6
6. Typical Application --------------------------------------------------------------------------------------- 7
7. Physical Dimensions -------------------------------------------------------------------------------------- 8
8. Marking Diagram ----------------------------------------------------------------------------------------- 9
9. Operational Descriptions -------------------------------------------------------------------------------- 9
9.1 PWM Output Control ---------------------------------------------------------------------------- 10
9.2 Enable Function ----------------------------------------------------------------------------------- 10
9.3 Soft-start Function -------------------------------------------------------------------------------- 10
9.4 Thermal Shutdown-------------------------------------------------------------------------------- 11
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 Output Voltage Setting Resistor (RFB1 and RFB2)-------------------------------------------- 15
10.4 Phase Compensation (COMP Pin) ------------------------------------------------------------- 15
10.5 Spike Noise Reduction Methods ---------------------------------------------------------------- 16
10.6 For Applications Where Output Voltage Is Higher than Input Voltage --------------- 17
10.7 PCB Layout----------------------------------------------------------------------------------------- 17
10.8 Using Bead-core ----------------------------------------------------------------------------------- 17
11. Pattern Layout Example ------------------------------------------------------------------------------- 18
12. Typical Characteristics--------------------------------------------------------------------------------- 20
Important Notes---------------------------------------------------------------------------------------------- 22
NR264S-DSE Rev.1.7
SANKEN ELECTRIC CO., LTD
2
Mar. 11, 2019
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015



SANKEN NR264S
NR264S
1. Absolute Maximum Ratings
Unless otherwise specified, TA = 25 °C. 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 (−).
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
FB Pin Voltage
COMP Pin Voltage
EN Pin Voltage
SS Pin Voltage
SS Pin Sink Current
Power Dissipation(1)
Junction Temperature(2)
VFB
0.3 to 6.0
V
VCOMP
0.3 to 6.0
V
VEN
0.3 to 6.0
V
VSS
0.3 to 6.0
V
ISSB
5.0
mA
PD
Mounted on the board
(see Section 11), TJ = 150 °C
1.56
W
TJ
40 to 150
°C
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.
40 to 150
60
80
°C
°C/W
°C/W
NR264S-DSE Rev.1.7
SANKEN ELECTRIC CO., LTD
3
Mar. 11, 2019
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015





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