A3977SEDTRT

Manufacturer Part NumberA3977SEDTRT
DescriptionPLCC44
ManufacturerAllegro Micro Systems, Inc.
A3977SEDTRT datasheet
 


Specifications of A3977SEDTRT

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MICROSTEPPING DMOS DRIVER WITH TRANSLATOR
A3977xED
(PLCC)
4
3
2
1
41
6
5
44
43
42
40
V
BB1
NC
7
NC
8
PWM
PFD
9
TIMER
RC
10
1
GND
11
GND
12
GND
13
REG
REF
14
÷8
RC
15
2
LOGIC
16
V
DD
SUPPLY
NC
17
V
BB2
18
19
20
21
22
23
24
25
26
27
28
ABSOLUTE MAXIMUM RATINGS
at T
= +25°C
A
Load Supply Voltage, V
............. 35 V
BB
Output Current, I
.................. ±2.5 A
OUT
Logic Supply Voltage, V
........... 7.0 V
DD
Logic Input Voltage Range, V
IN
(t
>30 ns) ..... -0.3 V to V
+ 0.3 V
w
DD
(t
<30 ns) ........... -1 V to V
w
DD
Sense Voltage, V
................. 0.5 V
SENSE
Reference Voltage, V
................ V
REF
Package Power Dissipation,
P
................................. See page 3
D
Operating Temperature Range, T
A
(A3977Kx) ............ -40°C to +125°C
(A3977Sx) .............. -20°C to +85°C
Junction Temperature, T
......... +150°C
J
Storage Temperature Range,
T
......................... -55°C to +150°C
S
* Output current rating may be limited by
duty cycle, ambient temperature, and heat
sinking. Under any set of conditions, do not
exceed the specified current rating or a
junction temperature of 150°C.
3977
The A3977xED and A3977xLP are complete microstepping motor drivers
with built-in translator. They are designed to operate bipolar stepper motors in
full-, half-, quarter-, and eighth-step modes, with output drive capability of 35
V and ±2.5 A. The A3977 includes a fixed off-time current regulator that has
the ability to operate in slow-, fast-, or mixed-decay modes. This current-
decay control scheme results in reduced audible motor noise, increased step
accuracy, and reduced power dissipation.
The translator is the key to the easy implementation of the A3977. By
simply inputting one pulse on the STEP input the motor will take one step
(full, half, quarter, or eighth depending on two logic inputs). There are no
39
NC
phase-sequence tables, high-frequency control lines, or complex interfaces to
CP
38
2
CP
program. The A3977 interface is an ideal fit for applications where a complex
37
1
V
36
CP
µP is unavailable or over-burdened.
35
GND
Internal synchronous-rectification control circuitry is provided to improve
34
GND
power dissipation during PWM operation.
GND
33
Internal circuit protection includes thermal shutdown with hysteresis,
V
32
REG
under-voltage lockout (UVLO) and crossover-current protection. Special
31
STEP
power-up sequencing is not required.
30
NC
NC
29
The A3977 is supplied in a choice of two power packages, a 44-pin
plastic PLCC with copper batwing tabs (suffix ED), and a thin (<1.2 mm), 28-
pin TSSOP with an exposed thermal pad (suffix LP). The SLP package is
available in a lead-free version (100% matte tin leadframe).
Dwg. PP-075-1
FEATURES
±2.5 A, 35 V Output Rating
Outputs, 0.45 Ω Source, 0.36 Ω Sink Typical
Low r
DS(on)
Automatic Current Decay Mode Detection/Selection
*
3.0 V to 5.5 V Logic Supply Voltage Range
Mixed, Fast, and Slow Current Decay Modes
Home Output
Synchronous Rectification for Low Power Dissipation
+ 1 V
Internal UVLO and Thermal Shutdown Circuitry
Crossover-Current Protection
DD
Part Number
Pb-free*
Package
A3977KED-T
Yes
44-pin PLCC
A3977KEDTR-T
Yes
44-pin PLCC
A3977KLP-T
Yes
28-pin TSSOP
A3977KLPTR-T
Yes
28-pin TSSOP 4000 per reel
A3977SED-T
Yes
44-pin PLCC
A3977SEDTR-T
Yes
44-pin PLCC
A3977SLP-T
Yes
28-pin TSSOP
A3977SLPTR-T
Yes
28-pin TSSOP 4000 per reel
*
Pb-based variants are being phased out of the product line. The variants cited in this
footnote are in production but have been determined to be LAST TIME BUY. This
classification indicates that sale of this device is currently restricted to existing customer
applications. The variants should not be purchased for new design applications because
obsolescence in the near future is probable. Samples are no longer available. Status
change: October 31, 2006. Deadline for receipt fo LAST TIME BUY orders: April 27, 2007.
These variants include:
A3977KED, A3977KEDTR, A3977KLP, A3977KLPTR, A3977SED,
A3977SEDTR, A3977SLP, and A3977SLPTR.
Ambient Temperature,
Packing
T
(°C)
A
27 per tube
–40 to 125
450 per reel
–40 to 125
50 per tube
–40 to 125
–40 to 125
27 per tube
–20 to 85
450 per reel
–20 to 85
50 per tube
–20 to 85
–20 to 85