A3940
Full-Bridge Power MOSFET Controller
Last Time Buy
These parts are in production but has been determined to be
LAST TIME BUY. This classification indicates that the product is
obsolete and notice has been given. Sale of this device is currently
restricted to existing customer applications. The device should not be
purchased for new design applications because of obsolescence in the
near future. Samples are no longer available.
Date of status change: December 5, 2016
Deadline for receipt of LAST TIME BUY orders: August 30, 2017
Recommended Substitutions:
A3941KLPTR-T
For existing customer transition, and for new customers or new appli-
cations, contact Allegro Sales.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC. assumes no
responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
3940
The A3940KLP and A3940KLW are designed specifically for
automotive applications that require high-power motors. Each provides
four high-current gate drive outputs capable of driving a wide range of
n-channel power MOSFETs in a full-bridge configuration.
Bootstrap capacitors are utilized to provide the above-battery supply
voltage required for n-channel FETs. An internal charge pump for the
high side allows for dc (100% duty cycle) operation of the bridge.
Protection features include supply under/overvoltage, thermal shut-
down, and motor lead short-to-battery and short-to-ground fault notifi-
cation, and a programmable dead-time adjustment for cross-conduction
prevention.
The
overvoltage trip point is user adjustable.
The A3940 is supplied in a choice of two power packages, a 28-pin
TSSOP with an exposed thermal pad (package type LP), and a 28-pin
wide-body SOIC (package type LW). Both package types are available
in lead (Pb) free versions, with 100 % matte-tin leadframe plating (suf-
fix –T).
Data Sheet
29319.100J
A3940KLP
(TSSOP with exposed
thermal pad)
A3940KLW
(SOIC)
Approx. 2X actual size.
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage Range, VBB, VD-
RAIN, CP1
........................
-0.6 V to +40 V
Output Voltage Ranges,
LSS ..............................
-2 V to +6.5 V
GHA/GHB, V
GHX
.........
-2 V to +55 V
SA/SB, V
SX
..................
-2 V to +45 V
GLA/GLB, V
GLX
..........
-2 V to +16 V
CA/CB, V
CX
..............
-0.6 V to +55 V
CP2,VCP, VIN ...........
-0.6 V to +52 V
Logic Input/Output Voltage Range
V
IN
, V
OUT
....................
-0.3 V to +6.5 V
Operating Temperature Range,
T
A
............................
-40°C to +135°C
Junction Temperature, T
J
..........
+150°C*
Storage Temperature Range,
T
S
............................
-55°C to +150°C
* Fault conditions that produce excessive junc-
tion temperature will activate device thermal
shutdown circuitry. These conditions can be
tolerated, but should be avoided.
FEATURES
Drives wide range of n-channel MOSFETs
Charge pump to boost gate drive at low-battery-input conditions
Bootstrapped gate drive with charge pump for 100% duty cycle
Synchronous rectification
Fault diagnostic output
Adjustable dead-time cross-conduction protection
Motor lead short-to-battery and short-to-ground protection
Undervoltage/overvoltage protection
-40°C to +150°C, T
J
operation
Thermal shutdown
Always order by complete part number
Part Number
A3940KLPTR-T
A3940KLPTR
Pb-free
Yes
–
Status Package
NND
LTB
28-pin TSSOP
28-pin TSSOP
Packing
4000 pcs/reel
4000 pcs/reel
3940
FULL-BRIDGE POWER
MOSFET CONTROLLER
Functional Block Diagram
See pages 7 and 8 for terminal assignments and descriptions.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2003 Allegro MicroSystems, Inc.
2
3940
FULL-BRIDGE POWER
MOSFET CONTROLLER
A3940KLP
(TSSOP)
A3940KLW
(SOIC)
* Measured on “High-K” multi-layer PWB per JEDEC Standard JESD51-7.
† Measured on typical two-sided PWB .
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
www.allegromicro.com
3
3940
FULL-BRIDGE POWER
MOSFET CONTROLLER
V
IN
≤
V
BB
= 7 V to 40 V, C
p
= 0.47 µF, C
r
= 1 µF, C
REG5
= 0.1 µF, C
REG13
= 10 µF, C
BOOT
= 0.1 µF, PWM = 22.5 kHz
square wave.
Characteristics
Power Supply
V
BB
Quiescent Current
I
BB
RESET = 1, V
BB
= V
IN
= 40 V, V
IN
≠
V
CP
,
coast, stopped, CP disabled, I
DEAD
= 170 µA
RESET = 1, V
BB
= V
IN
= 15 V, V
IN
≠
V
CP
,
coast, stopped, CP disabled, I
DEAD
= 170 µA
RESET = 1, V
BB
= V
IN
= 40 V, V
IN
≠
V
CP
, coast,
stopped, I
DEAD
= 170 µA, I
CP
= 0 mA
RESET = 1, V
BB
= V
IN
= 15 V, V
IN
≠
V
CP
, coast,
stopped, I
DEAD
= 170 µA, I
CP
= 0 mA
RESET = 1, V
BB
= V
IN
= 40 V, V
IN
≠
V
CP
, coast,
stopped, I
DEAD
= 170 µA, I
CP
= 15 mA
RESET = 1, V
BB
= V
IN
= 15 V, V
IN
≠
V
CP
, coast,
stopped, I
DEAD
= 170 µA, I
CP
= 15 mA
RESET = 0
No load
I
REG5
= 4.0 mA
I
REG5
= 0 - 4.0 mA, V
BB
= 40 V
V
BB
= 40 V, V
REG5
= 0
V
BB
= 14 - 40 V, I
CP
= 15 mA
V
BB
= 7 V, I
CP
= 15 mA
SR = 1, MODE = 0, ENABLE = PWM
I
CP
= 15 mA, V
BB
= 14 V - 40 V
V
IN
= V
CP
, V
BB
= 14 V - 40 V
V
IN
= V
CP
, V
BB
= 7 V
RESET = 1, V
BB
= V
IN
= 40 V, coast, stopped
V
IN
= 15 V, no load
I
REG13
= 15 mA, V
IN
= 11 V - 14 V
V
IN
= 15 V - 40 V, I
REG13
= 15 mA
V
IN
= 40 V, I
REG13
= 0 - 15 mA
V
IN
= 40 V, V
REG13
= 0 (pulse)
RESET = 0 to V
REG5
= 4 V
RESET = 1 to V
REG13
, UV cleared
–
–
–
–
–
–
–
4.5
–
–
–
11.7
15
–
–
–
–
12.6
–
–
–
–
10
–
4.8
4.3
5.0
4.8
35.4
35.1
–
5.0
5.0
5.0
28
13
–
500
2.5
3.5
1.4
13.3
0.7
2.0
2.0
60
30
1.4
7.0
7.0
7.0
7.0
40.0
40.0
1.0
5.5
–
–
–
13.8
–
–
–
–
–
14.0
–
–
–
–
–
–
Symbol
Conditions
Min
Limits
Typ
Max
ELECTRICAL CHARACTERISTICS:
unless otherwise noted at T
A
= -40°C to +135°C, T
J
= -40°C to +150°C,
Units
mA
mA
mA
mA
mA
mA
µA
V
mV
mV
mA
V
V
mA
mV
ms
ms
mA
V
V
mV
mV
mA
µs
ms
VREG5 Output Voltage
VREG5 Line Regulation
VREG5 Load Regulation
VREG5 Short-Circuit Current
VCP Output Voltage Level
VCP Gate Drive
VCP Output Voltage Ripple
VCP Pump-Up time
VREG13 Quiescent Input Current
VREG13 Output Voltage
VREG13 Dropout Voltage
VREG13 Line Regulation
VREG13 Load Regulation
VREG13 Short-Circuit Current
Go-to-Sleep Response Time
Wake-Up Response Time
V
REG5
V
REG5
V
REG5
I
REG5M
V
CP
I
CP
V
CP(PP)
t
up
I
REG13
V
REG13
V
REGDV
V
REG13
V
REG13
I
REG13M
t
sleep
t
wake
V
BB
+9.5 V
BB
+10.7 V
BB
+11.8
NOTES: Typical Data is for design information only.
Negative current is defined as coming out of (sourcing) the specified device terminal.
Continued next page …
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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