Data Sheet, Rev. 1.1, September 2011
HITFET - BTS3405G
Smart Low-Side Power Switch
Automotive Power
Smart Low-Side Power Switch
BTS3405G
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Block Diagram
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Configuration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin Assignment BTS3405G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
General Product Characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transient Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Description and Characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input and Power Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Failure Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output On-State Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protection Functions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 BTS3405G
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision History
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Data Sheet
2
Rev. 1.1, 2011-09-01
Smart Low-Side Power Switch
HITFET
BTS3405G
1
Features
•
•
•
•
•
•
•
•
•
•
Overview
Low input current
Short circuit and Overload protection
Current limitation
Input protection (ESD)
Thermal protection with auto restart
Compatible to standard Power MOSFET
Analog driving possible
Two channel concept saves PCB footprint
Green Product (RoHS compliant)
AEC Qualified
PG-DSO-8-25
Description
The BTS3405G is a two channel low-side power switch in PG-DSO-8-25 package providing embedded protective
functions. The device consists of two separate monolithic IC. Each with one 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
BTS3405G
Data Sheet
Package
PG-DSO-8-25
3
Marking
BTS3405G
Rev. 1.1, 2011-09-01
Smart Low-Side Power Switch
BTS3405G
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 BTS3405G offers ESD protection of each IN Pin in relation to the corresponding 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 each of the two power MOSFET.
During thermal shutdown the device tries to sink an increased input current at the corresponding IN pin to feedback
the fault condition on this channel.
The BTS3405G has a thermal-auto-restart function, the regarding channel 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, means without voltage on the IN pins.
Data Sheet
4
Rev. 1.1, 2011-09-01
Smart Low-Side Power Switch
BTS3405G
Block DiagramTerms
2
Block Diagram
Drain 1
Over-
voltage
Protection
Over-
temperature
Protection
IN 1
Gate
Driving
Unit
ESD
Protection
Short
circuit
detection
Source 1
Drain2
Over-
voltage
Protection
Over-
temperature
Protection
IN 2
Gate
Driving
Unit
ESD
Protection
Short
circuit
detection
Source2
BlockDiagram_3405
Figure 1
Block Diagram
2.1
Terms
Figure 2
shows all external terms used in this data sheet.
V
bb
R
in1
V
IN1
R
in2
V
IN2
I
IN2
IN2
Source1
I
S 1
GND
Terms.emf
V
bb
Z
L1
I
IN1
IN1
Drain1
I
D1
Z
L2
I
D2
V
D1
Source2
I
S2
V
D2
BTS3405G
Drain2
Figure 2
Terms
Data Sheet
5
Rev. 1.1, 2011-09-01
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