A4927
Automotive Half-Bridge MOSFET Driver
FEATURES AND BENEFITS
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•
•
•
•
•
•
•
•
•
•
Half-bridge MOSFET driver
Bootstrap gate drive for N-channel MOSFET bridge
Cross-conduction protection with adjustable dead time
Charge pump regulator for low supply voltage operation
5.5 to 50 V supply voltage operating range
SPI-compatible serial interface
Bridge control by direct logic inputs or serial interface
Programmable gate drive
Current sense amplifier
2
Programmable diagnostics
A
2
SIL™ product—device features for
safety-critical systems
DESCRIPTION
The A4927 is an N-channel power MOSFET driver capable of
controlling MOSFETs connected in a half-bridge arrangement
and is specifically designed for automotive applications with
high-power inductive loads, such as brush DC motors solenoids
and actuators.
The A4927 is intended for automotive systems that must meet
ASIL requirements. In common with other Allegro A
2
SIL
™
products, this device incorporates features to complement
proper system design, allowing users to achieve the required
ASIL level.
A unique charge pump regulator provides full gate drive for
battery voltages down to 5.5 V for most applications. A bootstrap
capacitor is used to provide the above-battery supply voltage
required for N-channel MOSFETs.
The half bridge can be controlled by independent logic-level
inputs or through the SPI-compatible serial interface. The
external power MOSFETs are protected from shoot-through
by a programmable dead time.
Integrated diagnostics provide indication of multiple internal
faults, system faults, and power bridge faults, and can be
configured to protect the power MOSFETs under most short-
circuit conditions.
In addition to providing full access to the bridge control, the
serial interface is also used to alter programmable settings such
as dead time, V
DS
threshold, and fault blank time. Detailed
diagnostic information can be read through the serial interface.
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APPLICATIONS
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•
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Anti-lock braking systems (ABS)
HVAC (blower fan)
DC pumps (fuel, oil, water)
Solenoids and actuators
Similar industrial applications
PACKAGE:
24-lead TSSOP with
exposed pad (suffix LP)
Not to scale
The A4927 is supplied in a 24-lead eTSSOP (suffix LP). This
package is lead (Pb) free, with 100% matte-tin leadframe
plating (suffix –T).
VBAT
ECU
A4927
Load
SPI
GND
Figure 1: Typical Application
A4927-DS, Rev. 1
April 24, 2017
A4927
Automotive Half-Bridge MOSFET Driver
SPECIFICATIONS
SELECTION GUIDE
Part Number
A4927KLPTR-T
Packing
4000 pieces per reel
Package
7.8 mm × 4.4 mm, 1.2 mm max height
24-lead TSSOP with exposed thermal pad
ABSOLUTE MAXIMUM RATINGS
[1]
Characteristic
Load Supply Voltage
Regulator Output
Charge Pump Capacitor Terminal
Charge Pump Capacitor Terminal
Battery-Compliant Logic Input Terminals
Logic Input Terminals
Logic Output Terminal
Diagnostics Output
Sense Amplifier Inputs
Sense Amplifier Output
Bridge Drain Monitor Terminal
Bootstrap Supply Terminal
High-Side Gate Drive Output Terminal
High-Side Source (Load) Terminal
Low-Side Gate Drive Output Terminal
Bridge Low-Side Source Terminal
Ambient Operating Temperature Range
Maximum Continuous Junction Temperature
Transient Junction Temperature
Storage Temperature Range
1
Symbol
V
BB
V
REG
V
CP1
V
CP2
V
IB
V
I
V
O
V
DIAG
V
CSI
V
CSO
V
BRG
V
C
V
GH
V
S
V
GL
V
LSS
T
A
T
J(max)
T
Jt
T
stg
VREG
CP1
CP2
Notes
Rating
–0.3 to 50
–0.3 to 16
–0.3 to 16
V
CP1
– 0.3 to
V
REG
+ 0.3
–0.3 to 50
–0.3 to 6
–0.3 to 6
–0.3 to 50
–4 to 6.5
–0.3 to 6
–5 to 55
–0.3 to V
REG
+ 50
V
C
– 16 to V
C
+ 0.3
–18 to V
C
+ 0.3
V
C
– 16 to V
C
+ 0.3
–18 to V
C
+ 0.3
V
REG
– 16 to 18
–8 to 18
V
REG
– 16 to 18
–8 to 18
–40 to 150
165
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
°C
°C
°C
°C
HS, LSn, RESETn, ENABLE
STRn, SCK, SDI
SDO
DIAG
CSP, CSM
CSO, OOS
VBRG
C
GH
GH (transient)
S
S (transient)
GL
GL (transient)
LSS
LSS (transient)
Limited by power dissipation
Overtemperature event not exceeding 10 seconds,
lifetime duration not exceeding 10 hours,
guaranteed by design characterization.
180
–55 to 150
With respect to GND. Ratings apply when no other circuit operating constraints are present.
THERMAL CHARACTERISTICS
:
May require derating at maximum conditions
Characteristic
Symbol
R
θJA
R
θJP
2
Additional
Test Conditions
[2]
4-layer PCB based on JEDEC standard
2-layer PCB with 3.8 in.
2
copper each side
Value
28
38
2
Unit
°C/W
°C/W
°C/W
Package Thermal Resistance
thermal information available on the Allegro website.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A4927
Automotive Half-Bridge MOSFET Driver
Table of Contents
Features and Benefits
Description
Package
Typical Application
Selection Guide
Absolute Maximum Ratings
Thermal Characteristics
Pinout Diagram and Terminal List Table
Functional Block Diagram
Electrical Characteristics
Supply and Reference
Gate Output Drive
Logic Inputs and Outputs
Logic I/O – Dynamic Parameters
Current Sense Amplifier
Diagnostics and Protection
Timing Diagrams
Logic Truth Tables
Functional Description
Input and Output Terminal Functions
Power Supplies
Pump Regulator
Gate Drives
Bootstrap Supply
Bootstrap Charge Management
Top-Off Charge Pump
High-Side Gate Drive
Low-Side Gate Drive
Gate Drive Passive Pull-Down
Dead Time
1
1
1
1
2
2
2
4
5
6
6
7
8
8
9
10
11
13
14
14
15
15
15
15
15
16
16
16
17
17
Serial Interface
Gate Drive Control
Logic Control Inputs
Output Disable
Sleep Mode
Current Sense Amplifier
Diagnostic Monitors
Status and Diagnostic Registers
Chip-Level Protection
Operational Monitors
Power Bridge and Load Faults
Fault Action
Fault Masks
Configuration Registers
Diagnostic Registers
Control Register
Status Register
Serial Register Reference
Application Information
Input/Output Structures
Layout Recommendations
Package Outline Drawing
Dead-Time Selection
Bootstrap Capacitor Selection
Bootstrap Charging
VREG Capacitor Selection
Current Sense Amplifier Configuration
Current Sense Amplifier Output Signals
17
18
18
19
19
19
19
19
20
21
23
23
25
27
27
27
28
29
35
35
35
35
36
36
36
37
38
39
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A4927
Automotive Half-Bridge MOSFET Driver
PINOUT DIAGRAM AND TERMINAL LIST TABLE
GND 1
DIAG 2
ENABLE 3
RESETn 4
HS 5
LSn 6
SDI 7
SCK 8
SDO 9
STRn 10
OOS 11
CSO 12
PAD
24 VBRG
23 VBB
22 CP1
21 CP2
20 VREG
19 C
18 S
17 GH
16 GL
15 LSS
14 CSP
13 CMS
24-Lead eTSSOP (suffix LP)
Pinout Diagram
Terminal List Table
Name
C
CP1
CP2
CSM
CSO
CSP
DIAG
ENABLE
GH
GL
GND
HS
LSn
LSS
OOS
RESETn
S
SCK
SDI
SDO
STRn
VBB
VBRG
VREG
PAD
Number
19
22
21
13
12
14
2
3
17
16
1
5
6
15
11
4
18
8
7
9
10
23
24
20
–
Bootstrap capacitor
Pump capacitor CCP connection
Pump capacitor CCP connection
Current sense amplifier (–) input
Current sense amplifier output
Current sense amplifier (+) input
Diagnostic output
Gate drive output control input
High-side gate drive output
Low-side gate drive output
Power ground
HS control input
LS control input
Low-side source
Sense amplifier offset output
Standby mode control input
Load connection
Serial clock input
Serial data input
Serial data output
Serial strobe (chip select) input
Main power supply
High-side drain voltage sense
Regulated gate drive supply
Thermal pad; connect to GND
Function
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
A4927
Automotive Half-Bridge MOSFET Driver
C
CP
CP1
VBB
Logic
Supply
Regulator
Charge
Pump
CP2
Charge
Pump
Regulator
VREG
C
REG
VBRG
C
VBAT
ENABLE
HS
LSn
Control
Logic
Bootstrap
Monitor
HS
Drive
VDS
Monitor
VDS
Monitor
LS
Drive
GH
S
RESETn
Timers
OOS
STRn
SCK
SDI
SDO
DIAG
Serial
Interface
Diagnostics &
Protection
PAD
DAC
DAC
GL
LSS
V
OOS
CSP
CSM
CSO
GND
Figure 2: Functional Block Diagram
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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