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PDF NCP348 Data sheet ( Hoja de datos )
| Número de pieza | NCP348 | |
| Descripción | Positive Overvoltage Protection Controller | |
| Fabricantes | ON Semiconductor | |
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NCP348
Positive Overvoltage
Protection Controller with
Internal Low RON NMOS FET
and Status FLAG
The NCP348 is able to disconnect the systems from its output pin
in case wrong input operating conditions are detected. The system is
positive overvoltage protected up to +28 V.
Due to this device using internal NMOS, no external device is
necessary, reducing the system cost and the PCB area of the
application board.
The NCP348 is able to instantaneously disconnect the output from
the input, due to integrated Low RON Power NMOS (65 mW), if the
input voltage exceeds the overvoltage threshold (6.4 V) or
undervoltage threshold, of 3.25 V (UVLO).
At powerup (EN pin = low level), the Vout turns on 50 ms after the
Vin exceeds the undervoltage threshold.
The NCP348 provides a negative going flag (FLAG) output, which
alerts the system that a fault has occurred.
In addition, the device has ESD−protected input (15 kV Air) when
bypassed with a 1.0 mF or larger capacitor.
Features
• Overvoltage Protection up to 28 V
• On−Chip Low RDS(on) NMOS Transistor: 65 mW
• Internal Charge Pump
• Overvoltage Lockout (OVLO)
• Undervoltage Lockout (UVLO)
• Internal 50 ms Startup Delay
• Alert FLAG Output
• Shutdown EN Input
• Compliance to IEC61000−4−2 (Level 4)
8.0 kV (Contact)
15 kV (Air)
• ESD Ratings: Machine Model = B
Human Body Model = 3
• 10 Lead WDFN 2.5x2 mm Package
• This is a Pb−Free Device
Applications
• Cell Phones
• Camera Phones
• Digital Still Cameras
• Personal Digital Applications
• MP3 Players
http://onsemi.com
MARKING
DIAGRAM
WDFN10
MT SUFFIX
CASE 516AA
BAIM
G
BAI = Specific Device Code
M = Date Code
G = Pb−Free Package
PIN CONNECTIONS
IN 1
GND 2
FLAG 3
PAD1
GND
10 EN
9 NC
8 NC
IN 4
IN 5
PAD2
IN
7 OUT
6 OUT
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP348MTTBG WDFN−10 3000 / Tape & Reel
(Pb−Free)
NCP348MTTXG WDFN−10 10000 / Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2006
November, 2006 − Rev. 2
1
QFN−16
Publication Order Number:
NCP348/D
1 page  
Vin
Vout
FLAG
NCP348
TIMING DIAGRAMS
UVLO
ton
0.3 V
tstart
<OVLO
Vin − (RDS(on) I)
1.2 V
Figure 3. Startup
Vin
Vout
Vin − (RDS(on)
OVLO
toff
I)
0.3 V
FLAG
tstop
0.4 V
Figure 4. Shutdown on Overvoltage Detection
EN
Vout
Vin − (RDS(on)
I)
1.2 V
tdis
FLAG
0.3 V
Figure 5. Disable on EN = 1
EN
Vin
FLAG
1.2 V
OVLO
UVLO
100 ms
Figure 6. FLAG Response with EN = 1
http://onsemi.com
5
5 Page 
NCP348
310
290 1 oz C.F.
270
1 oz Sim
250 2 oz C.F.
2 oz Sim
230
210
190
175
150
0 25 50 75 100 125 150 175 200 225 250 275 300 325350
COPPER HEAT SPREADING AREA (mm2)
Figure 20.
INPUT
1
2
Figure 21. Demo Board Layout
OUTPUT
1 mF 25 V X5R 0603
Murata GRM188R61E105KA12D
EN_Power
C1
EN
1 IN
4 IN
5 IN
6
OUT 7
OUT
NCP348
8
NC
NC 9
10 EN
3
FLAG
GND
2
EN_State
C2
100 nF 50 V X7R 0805 not necessary
FLAG Power
FLAG
R1
1M
R2 3 2 1
100 k
R3
100 k
J2
2
1
1
GND
FLAG_State
2
F1 F2 F3 F4
Figure 22. Demo Board Schematic
http://onsemi.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet NCP348.PDF ] | |
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