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PDF NR885E Data sheet ( Hoja de datos )
| Número de pieza | NR885E | |
| Descripción | 3A 18V 350kHz Synchronous Buck Regulator | |
| Fabricantes | SANKEN | |
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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 VIN = 4.5V～18V
Output adjustable VO= 0.8V～14V
Fixed 350kHz frequency
Applications
LCD TV / Blu-Ray / Set top box
Green Electronic products
Other power supply
Typical Application Circuit
VIN
R3
VIN_s
C1
C2
GND
2
R1 IN
7
EN
C10
1
BS 3
SW
L1
NR885E
8
SS
5
FB
GND
NC
46
C9
R5
R4
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.
http://www.sanken-ele.co.jp
1
http://www.Datasheet4U.com
1 page  
3A, 18V, 350kHz , Synchronous Buck Regulator
NR885E
Oct./30/2013
NR885E Typical Performance Characteristics
Output startup
VO=3.3V, Load = Constant Resistance
Io = 0A
0.5A
1A
2A
3A
Input Voltage VIN [V]
Over Current Protection
VVoO==3.33V.3V
3.50
3.00
2.50
2.00 VIN = 8V
10V
1.50 12V
1.00
15V
18V
0.50
0.00
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Output Current IO [A] 出力電流Io [A]
Load Regulation: VLoad
NR880K ES1 VHSOO=P38 .S31VRT(Vo=3.3V)
3.35 VIN = 6V
8V
3.33 10V
12V
3.31 15V
18V
3.29
3.27
3.25
0
0.5 1 1.5 2 2.5 3 3.5
Output Current IO [A]
Io(A)
Shutdown Supply Current : IIN(off)
NR880K ES1 DIPV28ESN1=Iq0ofVf vs VIN at RT
EN:Open
10
9
8
7
6
5
4
3
2
1
0
0 2 4 6 8 10 12 14 16 18 20
Input Voltage VIN [V]
VIN(V)
Switching Frequency: fSW
400
390
380
370
360
350
340
330
320
310
300
0
NR880K ES1 HVSOOP=83S.13RVT(Vo=3.3V)
VIN = 6V
8V
10V
12V
15V
18V
0.5 1 1.5 2 2.5 3 3.5
Output Current IO [A]
Io(A)
Supply Current : IIN
VO=Io3=0.A3V
7
6
5
4
3
2
1
0
0 2 4 6 8 10 12 14 16 18
Input Voltage VIN [V入]力電圧Vin [V]
Rev.1.1
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
5
5 Page 
3A, 18V, 350kHz , Synchronous Buck Regulator
NR885E
Oct./30/2013
OPERATING PRECAUTIONS
Reliability can be affected adversely by improper storage environments and handling methods. Please observe the
following cautions.
Cautions for Storage
Ensure that storage conditions comply with the standard temperature (5 to 35°C) and the standard relative humidity
(around 40 to 75%); avoid storage locations that experience extreme changes in temperature or humidity.
Avoid locations where dust or harmful gases are present and avoid direct sunlight.
Reinspect for rust on leads and solderability of products that have been stored for a long time.
Cautions for Testing and Handling
When tests are carried out during inspection testing and other standard test periods, protect the products from power
surges from the testing products, shorts between the product pins, and wrong connections. In addition, avoid tests
exceeded ratings
Soldering
When soldering the products, please be sure to minimize the working time, within the following limits.
・Reflow Preheat ; 180°C / 90±30 s
Heat ; 250°C / 10±1s (260°C peak ,2times)
・Soldering iron ; 380±10°C / 3.5±0.5s (1time)
Electrostatic Discharge
When handling the products, the operator must be grounded. Grounded wrist straps worn should have at least 1MΩ of
resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator.
Workbenches where the products are handled should be grounded and be provided with conductive table and floor mats.
When using measuring equipment such as a curve tracer, the equipment should be grounded.
When soldering the products, the head of a soldering irons or the solder bath must be grounded in order to prevent leak
voltages generated by them from being applied to the products.
The products should always be stored and transported in Sanken shipping containers or conductive containers, or be
wrapped in aluminum foil.
Rev.1.1
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet NR885E.PDF ] | |
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