Smart Low-Side Power Switch
BTS3205N
1
2
2.1
3
3.1
3.2
4
4.1
4.2
4.2.1
5
5.1
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.1.6
6
6.1
6.2
6.3
6.4
7
8
Overview
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Block Diagram
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Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Configuration
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Pin Assignment BTS3205N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
General Product Characteristics
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Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transient Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Description and Characteristics
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Input and Power Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Failure Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output On-State Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protection Functions
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Thermal Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short Circuit Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
7
8
8
10
10
10
11
11
12
12
13
15
15
15
17
18
Package Outlines BTS3205N
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Revision History
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Data Sheet
2
Rev. 1.1, 2011-09-01
Smart Low-Side Power Switch
HITFET
BTS3205N
1
Features
•
•
•
•
•
•
•
•
•
Overview
Logic Level input
Short circuit and Overload protection
Current limitation
Input protection (ESD)
Thermal protection with auto restart
Compatible to standard Power MOSFET
Analog driving possible
Green Product (RoHS compliant)
AEC Qualified
PG-SOT-223-4
Description
The BTS3205N is a one channel low-side power switch in PG-SOT-223-4 package providing embedded protective
functions. The device is monolithic integrated and consist of an N-channel power MOSFET transistor and
additional protection circuitry.
Table 1
Product Summary
Drain Voltage
Input Voltage
Typical On-State Resistance at
T
j
= 25°C and Vin = 10V
Maximum On-State Resistance at
T
j
= 150°C and Vin = 10V
Nominal Load Current
Drain Current
Single Clamping Energy
1) Active clamped
2) Internally limited
V
D
V
IN(max)
R
DS(ON,amb typ)
R
DS(ON,hot max)
I
Dnom(min)
I
D
E
AS
42 V
1)
10 V
0.7
Ω
1.9
Ω
350 mA
600 mA
2)
65 mJ
Type
BTS3205N
Data Sheet
Package
PG-SOT-223-4
3
Marking
3205N
Rev. 1.1, 2011-09-01
Smart Low-Side Power Switch
BTS3205N
Overview
Protective Functions
•
•
•
•
Electrostatic discharge protection (ESD)
Active clamp over voltage protection
Thermal shutdown with auto restart
Short circuit protection
Fault Information
•
•
Thermal shutdown
Short to Battery and overload
Applications
•
•
•
•
Designed for driving Relays in Automotive Applications
All types of resistive, inductive and capacitive loads
Suitable for loads with peak currents
Replaces discrete circuits
Detailed Description
The device is able to switch all kind of resistive, inductive and capacitive loads, limited by
E
AS
and maximum
current capabilities.
The BTS3205N offers ESD protection of the IN Pin in relation to the Source Pin.
The overtemperature protection prevents the device from overheating due to overload and/or bad cooling
conditions. The temperature information is given by a temperature sensor in the power MOSFET. During thermal
shutdown the device tries to sink an increased input current to feedback the fault condition.
The BTS3205N has a thermal-auto-restart function, the device will turn on again after the measured temperature
has dropped down for the thermal hysteresis.
The over voltage protection is active during load-dump or inductive turn off conditions. The power MOSFET is
limiting the Drain - Source voltage to the defined clamping voltage. This function is available regardless of the input
pin state.
Data Sheet
4
Rev. 1.1, 2011-09-01
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