NR885E Datasheet, PDF (1/12 Pages) Sanken electric – Synchronous Buck Regulator

3A, 18V, 350kHz , Synchronous Buck Regulator
NR885E
Oct./30/2013
General Descriptions
The NR885E is synchronous buck regulator ICs
integrates High-side and Low-side power MOSFETs.
With the current mode control, ultra low ESR capacitors
such as ceramic capacitors can be used. The ICs have
protection functions such as Over-Current Protection
(OCP), Under-Voltage Lockout (UVLO) and Thermal
Shutdown (TSD). An adjustable Soft-Start by an external
capacitor prevents the excessive inrush current at turn-on
the regulator. The ICs integrate phase compensation
circuit which reduces the number of external components
and simplifies the design of customer application. The
ON/OFF pin (EN Pin) turns the regulator on or off and
helps to achieve low power consumption requirements.
The NR885E is available in an 8-pin SOIC package with
an exposed thermal pad on the back side.
Package
 Exposed SOIC 8
Thermally enhanced 8-Pin package
Features & Benefits
 Current mode PWM control
 Up to 95% efficiency
 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/OFF the regulator function
Electrical Characteristics
 3A output current
 Operating input range V_IN = 4.5V～18V
 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
V_IN
R3
V_IN_s
C1
C2
GND
2
R1
IN
7
EN
C10
1
BS 3
L1
SW
NR885E
R5
8
SS
5
FB
GND
NC
R4
4
6
C9
R6
D1
Vo
Vo_s
C4 C5
GND
SW
C1, C2: 10μF / 25V
C4, C5: 22μF / 16V
C9: 0.1μF
C10: 0.1μF
R1: 100kΩ
L1: 10μH
R3: 22Ω
R4: 8.2 kΩ, R5: 4.3kΩ (Vo=3.3V)
R6: 3.9kΩ
Rev.1.1
SANKEN ELECTRIC CO., LTD.
1
http://www.sanken-ele.co.jp