NCP349
Positive Overvoltage
Protection Controller with
Internal Low R
ON
NMOS FET
The NCP349 is able to disconnect the systems from its output pin
when wrong input operating conditions are detected. The system is
positive overvoltage protected up to +28 V.
This device uses an internal NMOS and therefore, no external
device is necessary, reducing the system cost and the PCB area of the
application board.
The NCP349 is able to instantaneously disconnect the output from
the input, due to integrated Low R
ON
Power NMOS (65 mW), if the
input voltage exceeds the overvoltage threshold (OVLO) or falls
below the undervoltage threshold (UVLO).
At powerup (EN pin = low level), the V
out
turns on t
on
time after
the V
in
exceeds the undervoltage threshold.
The NCP349 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
http://onsemi.com
6
1
DFN6
MN SUFFIX
CASE 506BM
MARKING DIAGRAM
1
XX MG
G
XX = Specific Device Code
M = Date Code
G
= Pb−Free Package
•
•
•
•
•
•
•
•
•
Overvoltage Protection up to 28 V
On−Chip Low R
DS(on)
NMOS Transistor: 65 mW
Internal Charge Pump
Overvoltage Lockout (OVLO)
Undervoltage Lockout (UVLO)
Soft−Start
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 = 2
•
DFN6 1.6x2 mm Package
•
This is a Pb−Free Device
Applications
PIN CONNECTIONS
IN
GND
FLAG
1
2
3
(Top View)
PAD1
IN
6
5
4
EN
OUT
OUT
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 11 of this data sheet.
•
•
•
•
•
Cell Phones
Camera Phones
Digital Still Cameras
Personal Digital Applications
MP3 Players
Q
©
Semiconductor Components Industries, LLC, 2012
September, 2012
−
Rev. 3
1
Publication Order Number:
NCP349/D
NCP349
Wall Adapter
−
AC/DC
−
USB
NCP349
7
IN
OUT 5
1
4
IN
OUT
6
FLAG
3
CC/CV
Charger or
System
BATTERY
1
mF
V
Bat
10 k
mP
EN
ENABLE/
GND
Microprocessor
2
0
0
Figure 1. Typical Application Circuit
7
4
INPUT
Gate
Driver
OUTPUT
5
1
V
REF
Charge
Pump
EN Block
UVLO
OVLO
Control
Logic and
Timer
3
EN
6
FLAG
2
GND
Figure 2. Functional Block Diagram
http://onsemi.com
2
NCP349
PIN FUNCTION DESCRIPTION
Pin No.
1, 7
Symbol
IN
Function
INPUT
Description
Input Voltage Pins. These pins are connected to the Wall Adapoter (AC−DC, Vbus ..). A 1
mF
low
ESR ceramic capacitor, or larger, must be connected between these pins and GND, as close as
possible to the DUT. The two IN pins must be connected together to power supply. (See PCB
recommendation for the pin7).
Ground
Fault Indication Pin. This pin allows an external system to detect a fault on the IN pins. The FLAG pin
goes low when input voltage exceeds OVLO threshold or drops below UVLO threshold. Since the
FLAG pin is open drain functionality, an external pull−up resistor to V
CC
must be added. (Minimum
10 kW).
Output Voltage Pins. These pins follow IN pins when “no fault” is detected. The two OUT pins must
be hardwired together.
Enable Pin. The device enters in shutdown mode when this pin is tied to a high level. In this case the
output is disconnected from the input. To allow normal functionality, the EN pin shall be connected to
GND to a pull down or to a I/O pin. This pin does not have an impact on the fault detection.
2
3
GND
FLAG
POWER
OUTPUT
4, 5
6
OUT
EN
OUTPUT
INPUT
MAXIMUM RATINGS
Rating
Minimum Voltage (IN to GND)
Minimum Voltage (All others to GND)
Maximum Voltage (IN to GND)
Maximum Voltage (All others to GND)
Maximum Current (UVLO<V
IN
<OVLO)
Maximum Peak Current (t
≤
1 ms, T
A
= 85°C)
Thermal Resistance, Junction−to−Air (Note 1)
Operating Ambient Temperature Range
Storage Temperature Range
Junction Operating Temperature
ESD Withstand Voltage (IEC 61000−4−2) (input only) when bypassed with 1.0
mF
capacitor
Human Body Model (HBM), Model = 2 (Note 2)
Machine Model (MM) Model = B (Note 3)
Moisture Sensitivity
Symbol
Vmin
in
Vmin
Vmax
in
Vmax
Imax
Imax
peak
R
qJA
T
A
T
stg
T
J
Vesd
Value
−0.3
−0.3
30
7.0
2.0
4.0
180
−40
to +85
−65
to +150
150
15 Air, 8.0 Contact
2000
200
Level 1
Unit
V
V
V
V
A
A
°C/W
°C
°C
°C
kV
V
V
−
MSL
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. The R
qJA
is highly dependent on the PCB heat sink area (connected to pin 7).
2. Human Body Model, 100 pF discharged through a 1.5 kW resistor following specification JESD22/A114.
3. Machine Model, 200 pF discharged through all pins following specification JESD22/A115.
http://onsemi.com
3
NCP349
ELECTRICAL CHARACTERISTICS
(Min/Max limits values (−40°C < T
A
< +85°C) and V
in
= +5.0 V. Typical values are T
A
= +25°C,
unless otherwise noted.)
Input Voltage Range
Undervoltage Lockout Threshold (Note 4)
NCP349MN, NCP349MNAE, NCP349MNAM
NCP349MNBG, NCP349MNBK
Undervoltage Lockout Hysteresis
Overvoltage Lockout Threshold (Note 4)
NCP349MNAE
NCP349MNBG
NCP349MNBK
NCP349MN
NCP349MNAM
Overvoltage Lockout Hysteresis
NCP349MN, NCP349MNAE, NCP349MNBG
NCP349MNBK
NCP349MNAM
V
in
versus V
out
Resistance
Supply Quiescent Current
Characteristic
Symbol
V
in
UVLO
Conditions
−
V
in
falls below UVLO threshold
from 5 V to 2.7 V
V
in
rises above UVLO + UVLO
hyst
V
in
rises above OVLO threshold
Min
1.2
2.8
3.0
30
5.53
5.70
6.0
6.67
6.8
30
50
50
−
−
−
−
−
−
−
1.2
−
−
Typ
−
2.95
3.25
60
5.68
6.02
6.4
6.85
7.2
60
100
70
65
70
140
60
20
−
1.0
−
−
1.0
Max
28
3.1
3.5
90
5.83
6.40
6.8
7.05
7.6
90
150
100
110
150
250
−
400
400
−
−
0.4
−
Unit
V
V
UVLO
hyst
OVLO
mV
V
OVLO
hyst
V
in
falls below OVLO + OVLO
hyst
mV
R
DS(on)
Idd
V
in
= 5.0 V, EN = GND,
Load connected to V
out
No load. EN = 5.0 V
No load. EN = Gnd
mW
mA
mA
mA
mV
mV
nA
V
V
nA
UVLO Supply Current
FLAG
Output Low Voltage
Idd
uvlo
Vol
flag
V
IN
= 2.7 V
1.2 V < V
IN
< UVLO
Sink 50
mA
on/FLAG pin
V
IN
> OVLO
Sink 1.0 mA on FLAG pin
FLAG
Leakage Current
EN
Voltage High
EN
Voltage Low
EN
Leakage Current
TIMINGS
Startup Delay
NCP349MN
NCP349MNAE
NCP349MNBG, NCP349MNBK, NCP349MNAM
FLAG
Going Up Delay
NCP349MN
NCP349MNAE
NCP349MNBG, NCP349MNBK, NCP349MNAM
Output Turn Off Time
FLAG
leak
Vih
Vol
EN
leak
ton
FLAG level = 5.0 V
−
−
EN = 5.0 V or GND
From V
in
> UVLO to V
out
= 0.3 V
(See Figures 3 & 7)
1.0
6.0
30
0.4
6.0
30
−
1.8
10
55
1.2
10
55
1.5
2.7
14
70
2.1
14
70
5.0
ms
tstart
From V
out
= 0.3 V to FLAG = 1.2 V
(See Figures 3 & 9)
ms
toff
From V
in
> OVLO to V
out
< = 0.3 V
(See Figures 4 & 8)
V
in
increasing from 5.0 V to 8.0 V
at 3.0 V/ms
Rload connected on V
out
From V
in
> OVLO to FLAG < =
0.4 V (See Figures 4 & 10)
V
in
increasing from 5.0 V to 8.0 V
at 3.0 V/ms
Rload connected on V
out
From EN > = 1.2 V to
V
out
< 0.3 V
Rload = 5.0
W
(See Figures 5 & 12)
ms
Alert Delay
tstop
−
1.0
−
ms
Disable Time
tdis
−
1.0
5.0
ms
NOTE: Electrical parameters are guaranteed by correlation across the full range of temperature.
4. Additional UVLO and OVLO thresholds ranging from UVLO and from OVLO can be manufactured. Contact your ON Semiconductor
representative for availability.
http://onsemi.com
4
NCP349
TIMING DIAGRAMS
<OVLO
V
in
V
in
−
(R
DS(on)
t
start
FLAG
FLAG
1.2 V
t
stop
0.4 V
I)
V
out
V
in
−
(R
DS(on)
I)
OVLO
t
off
0.3 V
V
in
UVLO
t
on
V
out
0.3 V
Figure 3. Startup
Figure 4. Shutdown on Overvoltage Detection
EN
EN
V
out
V
in
−
(R
DS(on)
FLAG
1.2 V
t
dis
I)
0.3 V
FLAG
V
in
1.2 V
OVLO
UVLO
t
on
+ t
start
Figure 5. Disable on EN = 1
Figure 6. FLAG Response with EN = 1
http://onsemi.com
5
单片机
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
