NJW4820

NJW4820
Single Low Side Switch
GENERAL DESCRIPTION
„ PACKAGE OUTLINE
The NJW4820 is the single low-side switch that can supply 0.5A.
The active clamp, overcurrent and thermal shutdown are built in
with Nch MOS FET.
It can be controlled by a logic signal (3V/5V) directly. Therefore, it
is suitable for a various power drive application of the motor, the
solenoid and the lamp etc.
NJW4820F
FEATURES
Drain-Source Voltage
43V
Drain Current
0.5A
Corresponding with Logic Voltage Operation: 3V/5V
Low On-Resistance
0.27Ω typ. (VIN=5V)
0.30Ω typ. (VIN=3.3V)
Low Consumption Current
80µA typ. (VIN=5V)
65µA typ. (VIN=3.3V)
Active Clamp Circuit
Over Current Protection (Self recovery type current limiting function)
Thermal Shutdown
Package Outline
SOT23-5
PIN CONFIGURATION
5
4
1. N.C.
2. SOURCE
3. IN
4. N.C.
5. DRAIN
1 2 3
BLOCK DIAGRAM
DRAIN
Active
Clamp
IN
Thermal
Shut Down
Over
Current
Protection
SOURCE
Ver.2014-01-08
-1-
NJW4820
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYNBOL
Drain-Source Voltage
VDS
Input Voltage
VIN
Power Dissipation
PD
RATINGS
+43
−0.3 to +6
480 (*1)
640 (*2)
(Ta=25°C)
REMARK
DRAIN–SOURCE Pin
IN–SOURCE Pin
UNIT
V
V
mW
–
Active Clamp Tolerance
10
mJ
–
EAS
(Single Pulse)
Active Clamp Current
IAP
1
A
–
Junction Temperature
Tj
–
−40 to +150
°C
Operating Temperature
Topr
–
−40 to +85
°C
Storage Temperature
Tstg
–
−50 to +150
°C
(*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers),
internal Cu area: 74.2×74.2mm
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN.
TYP.
Drain-Source Voltage
VDS
–
–
Drain Current
ID
0
–
Input Pin Voltage
VIN
0
–
-2-
MAX.
40
0.5
5.5
UNIT
V
A
V
(Ta=25°C)
REMARK
DRAIN–SOURCE Pin
DRAIN–SOURCE Pin
IN–SOURCE Pin
Ver.2014-01-08
NJW4820
ELECTRICAL CHARACTERISTICS
PARAMETER
Drain-Source Clamp Voltage
Input Threshold Voltage
Protection Circuit Function
Input Voltage Range
Zero-gate-voltage drain Current
Input Current 1
(at Normal Operation)
Input Current 2
(at Normal Operation)
Input Current 3
(at OCP Operation)
Input Current 4
(at OCP Operation)
On-state Resistance 1
On-state Resistance 2
Drain-Source Voltage
At Short Circuit Protection
Over Current Protection 1
Over Current Protection 2
(Unless otherwise noted, VDS=13V, Ta=25°C)
SYMBOL
VDSS_CL
Vth
VIN=0V, ID=1mA
VDS=13V, ID=10mA
VIN_opr
MIN.
TYP.
MAX.
UNIT
43
0.65
–
0.9
–
1.15
V
V
2.64
–
5.5
V
IDSS
VIN=0V, VDS=40V
–
–
1
µA
IIN1
VIN=5V
–
80
110
µA
IIN2
VIN=3.3V
–
65
90
µA
IIN3
VIN=5V, VDD=13V
–
160
200
µA
IIN4
VIN=3.3V, VDD=13V
–
105
130
µA
RDS_ON1
RDS_ON2
VIN=5V, ID=0.5A
VIN=3.3V, ID=0.5A
–
–
0.27
0.3
0.6
0.65
Ω
Ω
VDS(SC)
VIN=5V
28
–
–
V
ILIMIT1
ILIMIT2
VIN=5V, VDD=13V
VIN=3.3V, VDD=13V
VIN=0 to 5V,
VDD=13V, ID=0.5A
VIN=0 to 3.3V,
VDD=13V, ID=0.5A
VIN=5 to 0V,
VDD=13V, ID=0.5A
VIN=3.3 to 0V,
VDD=13V, ID=0.5A
VIN=0V, IDR=1A
1
0.75
1.6
1.3
2.3
2
A
A
–
5
–
µs
–
8.5
–
µs
–
42
–
µs
–
35
–
µs
–
0.95
1.25
V
Turn-on Time 1
tON1
Turn-on Time 2
tON2
Turn-off Time 1
tOFF1
Turn-off Time 2
tOFF2
Source–Drain Voltage Difference
VPDSD
Ver.2014-01-08
CONDITIONS
-3-
NJW4820
TIMING CHART
ON, OFF Switching Time (VIN=0 to 5V, VDS=13V, ID=0.5A)
90%
VIN
10%
90%
DRAIN
10%
tON
tOFF
High
Input signal
Low
ON
Over Current
Protection
OFF
ON
Thermal Protection
OFF
Drain-source
voltage
VDD
VDSS_CL
0V
Inductive
load
ILIMIT
Drain current
0A
Normal
-4-
Current limit
Thermal
shutdown
Active clamp
Ver.2014-01-08
NJW4820
TYPICAL APPLICATION
VDD
RL
Logic Voltage
ex. 5V, 3V
NJW4820
DRAIN
Micro
Controller
IN
Drive Signal
SOURCE
Ver.2014-01-08
-5-
NJW4820
CHARACTERISTICS
Drain-Source Clamp Voltage
vs. Ambient Temperature
60
Input Threshold Voltage
vs. Ambient Temperature
2
50
Input Threshold Voltage [V]
Drain-Source Clamp Voltage [V]
55
45
40
35
30
25
20
15
10
1.5
1
0.5
5
0
0
-50
-25
0
25 50 75 100 125 150
Ambient Temperature [ºC]
-50
Input Current vs. Ambient Temperature
(at OCP operating)
300
350
250
300
Input Current [µA]
Input Current [µA]
0
25 50 75 100 125 150
Ambient Temperature [ºC]
Input Current vs. Ambient Temperature
(at Normal Operation)
400
-25
250
200
150
200
150
100
100
50
50
0
0
-50
-25
0
25 50 75 100 125 150
Ambient Temperature [ºC]
-50
ON-state Resistance vs. Input Voltage
0.4
0.6
ON-state Resistance [Ω]
ON-state Resistance [Ω]
0
25 50 75 100 125 150
Ambient Temperature [ºC]
ON-state Resistance
vs. Ambient Temperature
0.7
0.35
0.3
0.25
0.2
0.15
0.1
0.5
0.4
0.3
0.2
0.1
0.05
0
0
0
-6-
-25
2
4
Input Voltage [V]
6
-50
-25
0
25 50 75 100 125 150
Ambient Temperature [ºC]
Ver.2014-01-08
NJW4820
CHARACTERISTICS
Over Current Protection vs. Input Voltage
Over Current Protection [A]
Over Current Protection [A]
Over Current Protection vs. Ambient Temperature
3.0
(Ta=25ºC)
2.00
1.50
1.00
0.50
0.00
2.5
2.0
1.5
1.0
0.5
0.0
0.0
1.0
2.0
3.0
4.0
Input Voltage [V]
5.0
6.0
-50
0
25 50 75 100 125 150
Ambient Temperature [ºC]
Turn-on Time vs.Ambient Temperature
60
Drain Current vs. Drain-Source Voltage
2
50
1.8
Turn-on Time [µs]
1.6
Drain Current: ID [A]
-25
1.4
1.2
1
0.8
40
30
20
0.6
10
0.4
0.2
0
0
0
10
20
30
Drain-Source Voltage: VDS [V]
40
-25
0
25 50 75 100 125 150
Ambient Temperature [ºC]
Turn-off Time vs.Ambient Temperature
60
TSD Detection/release Temperature
vs. Input Voltage
170
TSD Detection/release Temperature [ºC]
50
Turn-off Time [µs]
-50
40
30
20
10
0
Detection temp
160
150
140
Release temp
130
120
-50
Ver.2014-01-08
-25
0
25 50 75 100 125 150
Ambient Temperature [ºC]
2
3
4
Input Voltage [V]
5
6
-7-
Application Tips
NJW4820
Technical Information
Regarding Active Clamp Capacity of High/Low side Switch Products
What is “Active Clamp Capacity”.
The IC might suffer to damage by the inductive kickback at the transient time of ON state to OFF state, when an
inductive load such as a solenoid or motor is used for the load of the high-side/low-side switch.
The protection circuit for the inductive kickback is the active clamp circuit. The energy that can be tolerated by the
active clamp circuit is called "Active Clamp Capacity (EAS)".
When using an inductive load to the high-side/low-side switch, you should design so that the ESW does not exceed the
active clamp capability.
IC operation without an external protection parts (Fig 1)
Active Clamp
Current IAP
tA
ID
Active Clamp Period
VDS
Active Clamp
Current IAP
ID
VDD
0V
Time
Drain-Source Clamp Voltage
V DSS_CL
Drain-Source Clamp Voltage
V DSS_CL
VDS
VDD
0V
VIN
Time
5V
VIN
0V
tA Active Clamp Period
5V
0V
tON
tON
Fig1. Active Clamp Waveform (Left: Low-side Switch / Light High-side Switch)
At when the VIN turns off, the drain-source voltage (VDS) increases rapidly by the behavior of the inductive load that is
keeping current flowing. However, it will be clamped at VDSS_CL by the active clamp circuit. At the same time, the drain
current is flowed by adjusting the gate voltage of the output transistor, and the energy is dissipated at the output transistor.
The energy: ESW is shown by the following formula.
tA
E SW = ∫ VDS (t ) ⋅ I D (t )dt =
0
VDSS _ CL
1
2
LI AP ⋅
2
VDSS _ CL − VDD
The ESW is consumed inside IC as heat energy. However, the thermal shutdown does not work when the VIN is 0V.
Therefore in worst case the IC might break down. When using the active clamp, you should design ESW does not
exceed the EAS.
-8-
Ver.2014-01-08
Application
Tips
NJW4820
Technical Information
Application Hint
The simplest protection example is to add an external flywheel diode at the load to protect IC from an inductive
kickback. (Fig.2)
Flywheeling Diode
ID
VDD
VDD
VIN
DRAIN
SOURCE
VDD
OUT
VIN
V DS
V DS
ID
GND
Flywheeling Diode
Fig 2. Application Circuit of Inductance Load Driving (Left: Low-side Switch / Light High-side Switch)
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including the
industrial rights.
Ver.2014-01-08
-9-