NR131S Datasheet, PDF (1/15 Pages) Sanken electric – Ultra light load high efficiency

Ultra light load high efficiency,VIN=17V,Current mode Step-down Io=3A Buck Regulator IC
NR130S series
Sep/10/2013
General Descriptions
The NR130 series is buck regulator ICs integrates
High-side power MOSFETs. With the current mode
control, ultra low ESR capacitors such as ceramic
capacitors can be used. The ICs can realize super-high
efficiency by performing pulse skip operation at light
load condition. The ICs have protection functions such as
Over-Current Protection (OCP), Under-Voltage Lockout
(UVLO) and Thermal Shutdown (TSD). Soft starting
time can be set up by selecting an external capacitor
value. The ON/OFF pin (EN Pin) turns the regulator on
or off and helps to achieve low power consumption
requirements. The NR130 series is available in an 8-pin
SOIC package.
Package
 SOIC8(SOP8)
NR131S
NR134S
Features & Benefits
 Current mode PWM control
 Up to 94% efficiency at normal load condition
 Up to 85% efficiency at light load condition
 Stable with low ESR ceramic output capacitors
 Built-in protection function
Over Current Protection (OCP)
Thermal Shutdown (TSD)
Under Voltage Lockout (UVLO)
 Built-in phase compensation
 Adjustable Soft-Start with an external capacitor
 Turn ON/OF the regulator function
Programable Pulse-Skip operation
Electrical Characteristics
 3A Continuous output current
 Operating input range V_IN = 4.5V～17V
 Output adjustable V_O = 0.8V～14V
 Fixed 350kHz frequency
Applications
 LCD TV / Blu-Ray / Set top box
 Green Electronic products
 Other power supply
Typical Application Circuit
NR131S
For NR131S
C1, C2: 10μF / 25V, C4, C5: 22μF / 16V, C7: 0.1μF, C9:1800pF, C11: 220pF(Option), R1: 510kΩ , R3: 10Ω, R4: 36 kΩ, R5: 27kΩ
(VO=5.0V), R6: 12kΩ, R7:510kΩ(Option), D1: SJPJ-L4, L1: 10μH
Rev.1.2
SANKEN ELECTRIC CO., LTD.
1
http://www.sanken-ele.co.jp