Freescale Semiconductor
Advance Information
Document Number: MC34981
Rev. 2.0, 9/2013
Single High Side Switch
(4.0 mOhm), PWM clock up to
60 kHz
The 34981 is a high frequency, self-protected 4.0 m R
DS(ON)
high
side switch used to replace electromechanical relays, fuses, and
discrete devices in power management applications.
The 34981 can be controlled by pulse-width modulation (PWM) with
a frequency up to 60 kHz. It is designed for harsh environments, and it
includes self-recovery features. The 34981 is suitable for loads with high
inrush current, as well as motors and all types of resistive and inductive
loads.
The 34981 is packaged in a 12 x 12 mm non-leaded power-enhanced
PQFN package with exposed tabs.
This device is powered by SMARTMOS technology.
Features
•
•
•
•
•
•
•
•
•
Single 4.0 m R
DS(ON)
maximum high side switch
PWM capability up to 60 kHz with duty cycle from 5% to 100%
Very low standby current
Slew-rate control with external capacitor
Overcurrent and overtemperature protection, undervoltage
shutdown, and fault reporting
Reverse supply protection
Gate drive signal for external low side N-channel MOSFET with
protection features
Output current monitoring
Temperature feedback
34981
Industrial
HIGH SIDE SWITCH
Bottom View
FK (Pb-Free Suffix)
98ARL10521D
16-PIN PQFN (12 X 12)
Applications:
•
•
•
•
•
DC motors
Solenoids
Power distribution
Heating elements
Pumps
V
DD
V
DD
V
PWR
34981
CONF
I/O
I/O
VPWR
CBOOT
OUT
DLS
FS
INLS
EN
INHS
TEMP
CSNS
MCU
I/O
I/O
A/D
A/D
GLS
OCLS SR GND
M
Figure 1. 34981 Simplified Application Diagram
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2013. All rights reserved.
ORDERABLE PARTS
ORDERABLE PARTS
Table 1. Orderable Part Variations
Part Number
(1)
MC34981ABHFK
Notes
1. To Order parts in Tape & Reel, add the R2 suffix to the part number.
Notes
Temperature (T
A
)
-40 to 125 °C
Package
16 PQFN
34981
2
Analog Integrated Circuit Device Data
Freescale Semiconductor
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VPWR
Undervoltage
Detection
TEMP
Temperature
Feedback
Bootstrap Supply
CBOOT
SR
FS
EN
INHS
INLS
Logic
Current Protection
Gate Driver
Slew Rate Control
OUT
Overtemperature
Detection
5.0V
R
DWN
I
CONF
I
DWN
Cross-
Conduction
OUT Current
Recopy
5.0 V
Low Side
Gate Driver
and Protection
GLS
DLS
CONF
I
OCLS
GND
CSNS
OCLS
Figure 2. 34981 Simplified Internal Block Diagram
34981
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
PIN CONNECTIONS
PIN CONNECTIONS
Package Transparent Top View
CSNS
TEMP
EN
INHS
FS
INLS
CONF
OCLS
DLS
GLS
SR
CBOOT
4
5
6
7
8
9
Figure 3. Pin Connections
Descriptions of the pins listed in the table below can be found in the Functional Description section located on
page 15.
Table 2. PIN DEFINITIONS
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15, 16
Pin Name
CSNS
TEMP
EN
INHS
FS
INLS
CONF
OCLS
DLS
GLS
SR
CBOOT
GND
VPWR
OUT
Pin
Function
Reports
Reports
Input
Input
Reports
Input
Input
Input
Input
Output
Input
Input
Ground
Input
Output
Formal Name
Output Current Monitoring
Temperature Feedback
Enable
(Active High)
Serial Input High Side
Fault Status
(Active Low)
Serial Input Low Side
Configuration Input
Low Side Overload
Drain Low Side
Low Side Gate
Slew Rate Control
Bootstrap Capacitor
Ground
Positive Power Supply
Output
Definition
This pin is used to generate a ground-referenced voltage for the
microcontroller (MCU) to monitor output current.
This pin is used by the MCU to monitor board temperature.
This pin is used to place the device in a low-current Sleep mode.
This input pin is used to control the output of the device.
This pin monitors fault conditions and is active LOW.
This pin is used to control an external low side N-channel MOSFET.
This input manages MOSFET N-channel cross-conduction.
This pin sets the V
DS
protection level of the external low side MOSFET.
This pin is the drain of the external low side N-channel MOSFET.
This output pin drives the gate of the external low side N-channel
MOSFET.
This pin controls the output slew rate.
This pin provides the high pulse current to drive the device.
This is the ground pin of the device.
This pin is the source input of operational power for the device.
These pins provide a protected high side power output to the load
connected to the device.
10
11
12
GND
13
VPWR
14
15
OUT
16
OUT
2
3
1
34981
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 3. Maximum Ratings
All voltages are with respect to ground unless otherwise noted.
Rating
ELECTRICAL RATINGS
Power Supply Voltage
Steady-state
Input/Output Pins Voltage
(2)
INHS, INLS,
CONF, CSNS, FS,
TEMP, EN
V
OUT
41.0
-5.0
I
OUT
I
CL(CSNS)
I
CL(EN)
V
SR
C
BOOT
V
OCLS
V
GLS
V
DLS
V
ESD
40.0
15.0
2.5
- 0.3 to 54.0
- 0.3 to 54.0
- 5.0 to 7.0
- 0.3 to 15.0
- 5.0 to 41.0
± 2000
± 750
± 500
A
mA
mA
V
V
V
V
V
V
V
PWR
-16 to 41
- 0.3 to 7.0
V
V
Symbol
Value
Unit
Output Voltage
Positive
Negative
Continuous Output Current
(3)
CSNS Input Clamp Current
EN Input Clamp Current
SR Voltage
C
BOOT
Voltage
OCLS Voltage
Low Side Gate Voltage
Low Side Drain Voltage
ESD Voltage
(4)
Human Body Model (HBM)
Charge Device Model (CDM)
Corner Pins (1, 12, 15, 16)
All Other Pins (2-11, 13-14)
V
Notes
2. Exceeding voltage limits on INHS, INLS, CONF, CSNS, FS, TEMP, and EN pins may cause a malfunction or permanent damage to the
device.
3. Continuous high side output rating as long as maximum junction temperature is not exceeded. Calculation of maximum output current
using package thermal resistance is required.
4. ESD testing is performed in accordance with the Human Body Model (HBM) (C
ZAP
= 100 pF, R
ZAP
= 1500
)
and the Charge Device
Model (CDM), Robotic (C
ZAP
= 4.0 pF).
34981
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
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