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A3918SESTR-T

P1-P3P4-P6P7-P8
Description
Designed for pulse width modulated (PWM) control of a low
voltage DC motor, the A3918 is capable of output currents up
to 1.5 A and operating voltages from 2.5 to 9 V.
The A3918 has an internal fixed off-time PWM timer that
sets a peak current based on the selection of a current sense
resistor. An overcurrent output flag is provided that notifies
the user when the current in the motor winding reaches the
peak current determined by the sense resistor. The fault output
does not affect driver operation.
The A3918 is provided in a 16-contact, 3 mm × 3 mm, 0.75 mm
nominal overall height QFN, with exposed pad for enhanced
thermal dissipation. It is lead (Pb) free, with 100% matte tin
leadframe plating.
Applications include the following:
▪ Digital still cameras (DSC)
▪ Cell phone cameras
▪ USB powered devices
▪ Battery powered devices
Features and Benefits
▪ 2.5 to 9 V operation
▪ Internal PWM current control
▪ Synchronous rectification for reduced power dissipation
▪ Peak current output flag
▪ Undervoltage lockout
▪ Low R
DS(on)
outputs
▪ Small package
▪ Brake mode for DC motor
▪ Sleep function
▪ Crossover-current protection
▪ Thermal shutdown
Low Voltage DC Motor Driver
Package: 16-contact QFN (suffix ES)
Functional Block Diagram
A3918
Approximate size
3 × 3 mm
0.75 mm overall height
A3918-DS
OUTA
OUTB
VBB
IN1
IN2
GND PAD GND GND
FL
VBB
10 μF
10 V
+5 V
VCP
CP1
CP2
Charge
Pump
R
SENSE
SENSE
Control Logic
Sense
VCP
Sense
Regulator
0.1 μF
0.1 μF
CP3
CP4
0.1 μF
PWM Latch
and
Blanking
Comparator
Bridge
SLEEP
Low Voltage DC Motor Driver
A3918
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Load Supply Voltage V
BB
9.6 V
Logic Input Voltage Range V
IN
–0.3 to 7 V
Sense Voltage V
SENSE
Continuous 0.5 V
Pulsed, t
w
< 1 μs1V
Output Current I
OUT
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.
Continuous 1 A
Peak, DC < 30% 1.5 A
Operating Temperature Range T
A
Range S –20 to 85 °C
Junction Temperature T
J(max)
150 °C
Storage Temperature Range T
stg
–40 to 150 °C
Selection Guide
Part Number Packing Package
A3918SESTR-T 1500 pieces per 7-in. reel 16-pin QFN with exposed thermal pad
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic Symbol Test Conditions* Value Units
Package Thermal Resistance
R
θJA
4-layer PCB based on JEDEC standard 42 ºC/W
*Additional thermal information available on the Allegro website.
Terminal List Table
Name Number Function
CP1
15 Charge pump capacitor terminal 1
CP2
1 Charge pump capacitor terminal 2
CP3
14 Charge pump capacitor terminal 3
CP4
16 Charge pump capacitor terminal 4
FL
7 Current limit flag
GND
2, 6, 8 Ground
IN1
4 Control input 1
IN2
5 Control input 2
OUTA
12 DMOS full-bridge output A
OUTB
10 DMOS full-bridge output B
PAD
– Exposed thermal pad
SENSE
11 Current sense resistor terminal
¯
S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
3 Sleep logic input, active low
VBB
9 Supply Voltage
VCP
13 Reservoir capacitor terminal
Pin-out Diagram
PAD
12
11
10
9
1
2
3
4
5
6
7
8
16
15
14
13
CP4
CP1
CP3
VCP
IN2
GND
FL
GND
OUTA
SENSE
OUTB
VBB
CP2
GND
SLEEP
IN1
Low Voltage DC Motor Driver
A3918
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS
1,2
valid at T
A
= 25°C and V
BB
= 2.5 to 9 V, unless otherwise noted
Characteristics Symbol Test Conditions Min. Typ. Max. Units
Operating Voltage Range V
BB
2.5 – 9 V
VBB Supply Current I
BB
I
OUT
= 0 mA, PWM = 50 kHz, Duty Cycle = 50% – 5 – mA
I
OUT
= 0 mA, outputs disabled, V
BB
= 9.6 V – 3 – mA
Sleep mode, V
IN
< 0.4 V – 150 500 nA
Output Resistance R
DS(on)
Source driver, I
OUT
= 400 mA , V
BB
= 3 V, T
J
= 25°C – 0.52 0.60 Ω
Source driver, I
OUT
= 400 mA , V
BB
= 3 V, T
J
= 85°C – 0.78 – Ω
Sink driver, I
OUT
= 400 mA, V
BB
= 3 V, T
J
= 25°C – 0.62 0.74 Ω
Sink driver, I
OUT
= 400 mA, V
BB
= 3 V, T
J
= 85°C – 0.93 – Ω
Current Trip Sense Voltage V
SENSE
FL falling edge 160 200 240 mV
Clamp Diode Voltage V
f
I = 400 mA – – 1 V
Output Leakage Current I
DSS
Outputs, V
OUT
= 9 V –20 – 20 μA
Control Logic
Logic Input Voltage
V
IN(1)
2.0 – 5.5 V
V
IN(0)
– – 0.8 V
Logic Input Current
I
IN(1)
V
IN
= 5.5 V – <100 500 nA
I
IN(0)
V
IN
= 0.8 V – <–100 –500 nA
Input Hysteresis V
INhys
– 150 – mV
¯
S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
Input
V
SLEEP(0)
– – 0.4 V
V
SLEEP(1)
2 – – V
Fault Output V
FL
Flag asserted, I
FL
= 1 mA – – 200 mV
Fault Output Leakage Current I
FL
V
FL
= 5 V – – 1 μA
Fault Output Timer t
FL
Reset of PWM latch – 300 – μs
Blank Time t
BLANK
2.1 3 3.9 μs
Fixed Off-Time t
OFF
– 30 – μs
Propagation Delay Time
t
pd(on)
Input high to source on, input low to source off 100 235 350 ns
t
pd(off)
Input low to sink off, input high to sink on 50 100 200 ns
Protection Circuitry
Crossover Delay t
COD
200 425 650 ns
VBB Undervoltage Lockout Threshold V
BBUVLO
V
BB
rising 2.2 2.31 2.45 V
VBB Undervoltage Lockout Hysteresis V
BBUVHYS
200 300 400 mV
Thermal Shutdown Temperature T
JTSD
– 165 – °C
Thermal Shutdown Hysteresis T
JTSDHYS
– 15 – °C
1
For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.
2
Specifications over the operating temperature range are assured by design and characterization.
P1-P3P4-P6P7-P8

A3918SESTR-T

Mfr. #:
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Manufacturer:
Description:
IC MOTOR DRIVER 2.5V-9V 16QFN
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