PT2467
1A Low-Voltage H-Bridge Driver
DESCRIPTION
The PT2467 provides an integrated motor driver for
cameras, consumer products, toys and other
application with low-voltage or battery-powered
motion control.
The PT2467 can supply up to 1A of output DC current.
It operates on a motor power supply(VM) from 0 to 12V
and a device power supply voltage (VCC) of 1.8V to
6V.
The PT2467 has a PWM (IN1-IN2) input interface Full
protections are integrated with over-current protection,
under-voltage
lockout
and
over-temperature
shutdown.
FEATURE
H-Bridge Motor Driver
- DC Motor or Other Loads
- Low On-Resistance : HS+LS 1Ω
1-A Maximum DC Drive Current
Separate Motor and Logic Supply
- Motor VM : 0 to 12V
- Logic VCC : 1.8V to 6V
Low-Power Sleep Mode
-
10nA with I
VM
and I
VCC
Small Package and Footprint
- 8-Pin DFN with Thermal PAD(2.0 X 2.0 mm)
- 8-Pin SOP
Protection Features
- VCC Under-Voltage Lockout
- Over-Current Protection
- Thermal Shutdown
APPLICATION
Cameras
DSLR Lenses
Consumer Products
Toys
Robotics
BLOCK DIAGRAM
VM
(0V to 12V)
VM
VM
VCC
(1.8V to 6V)
VCC
Gate
Driver
UVLO
OCP
OUT1
IN1
Logic
VM
M
IN2
Gate
Driver
nSLEEP
OCP
OUT2
Over
Temp
GND
Figure 1. Function Block Diagram
Tel: 886-2-66296288
‧
Fax: 886-2-29174598
‧
http://www.princeton.com.tw
‧
2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan
PT2467
APPLICATION CIRCUIT
VM
VCC
*C3
0.1uF
C1
2
OUT1
3
Thermal
Pad
1
VM
VCC
8
0.1uF
7
nSLEEP
6
C2
M
4
OUT2
IN1
GND
IN2
5
Figure 2. Schematic of Application
The recommended C3 is 10uF above. Details are referred to at the chapter
“Power Supply Recommendations”.
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PT2467
ORDER INFORMATION
Valid Part Number
PT2467-S
PT2467
Package Type
SOP 8
DFN 8
Top Code
PT2467-S
PT2467
PIN DESCRIPTION
Top View
VM
1
8
VCC
OUT1
2
Thermal
Pad
7
nSLEEP
OUT2
3
6
IN1
GND
4
5
IN2
Pin Name
VM
OUT1
OUT2
GND
IN2
IN1
nSLEEP
VCC
I/O
Power
Output
Output
Power
Input
Input
Input
Power
Description
Motor power supply
Motor output 1
Motor output 2
Ground
Input 2
Input 1
Sleep mode input
Logic power supply
Pin No.
1
2
3
4
5
6
7
8
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PT2467
FUNCTION DESCRIPTION
BRIDGE CONTROL
The PT2467 is controlled using a PWM input interface, also called an IN-IN interface. Each output is controlled by a
corresponding input pin.
nsleep
IN1
IN2
Out1
Out2
Function (DC Motor)
0
X
X
Z
Z
Coast
1
1
1
1
0
0
1
1
0
1
0
1
Z
Z
Coast
Reverse
Forward
Brake
L
H
H
L
L
L
Table 1. Control Logic
PROTECTION MANAGEMENT
The PT2467 is fully protected against VCC under-voltage, overcurrent, and over-temperature events
Fault
Condition
H-Bridge
Recovery
VCC Under-Voltage
VCC < 1.6V
Disable
VCC>1.8V
Over-Current
IOUT > 1.9A (MIN)
Disable
tRETRY
TJ < 150℃
Thermal Shutdown TJ > 150℃ (MIN)
Disable
Table 2. Fault Behavior
FUNCTIONAL MODES
The PT2467 is active unless the nSLEEP pin is brought logic low. In sleep mode, the H-bridge FETs are disabled Hi-Z.
The PT2467 is brought out of sleep mode automatically if nSLEEP is brought logic high.
Mode
Condition
H-Bridge
Operating
nSLEEP pin=1
Operating
Sleep Mode
nSLEEP pin=0
Disabled
Fault Encountered Any fault condition met
Disabled
Table 3. Operation Modes
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PT2467
POWER SUPPLY RECOMMENDATIONS
Having appropriate local bulk capacitance is an important factor in motor-drive system design. It is generally beneficial
to have more bulk capacitance.
The amount of local bulk capacitor needed depends on the following factors,
The highest current required by the motor system.
The power-supply capacitance and ability to source current
The amount of parasitic inductance between the power supply and motor system
The acceptable voltage ripple
The type of motor used (brushed dc, brushless dc, stepper)
The motor braking method.
The inductance between the power supply and motor drive system limits the rate at which current can change from the
power supply. If the local bulk capacitance is too small, the system responds to excessive current demands or dumps
from the motor with a change in voltage. When adequate bulk capacitance is used, the motor voltage remains stable
and high current can be quickly supplied.
The voltage rating for bulk capacitors should be higher than the operating voltage, to provide margin for cases when
the motor transfers energy to supply. The recommended C3 is 10uF above.
Parasitic Wire
Inductance
Power Supply
Motor Driver System
VM
C3
C1
Motor
Driver
GND
Local Bulk
Capacitor
IC Bypass
Capacitor
Figure 3. Motor Driver System with External Power Supply
PCB LAYOUT
The VM and VCC should be bypassed to GND using low-ESR ceramic capacitors with recommended value of 0.1uF.
These capacitors should be placed as close to the VM and VCC as possible with a thick trace or ground plane
connection to GND.
C1 0.1uF
C3 10uF
VM
1
C2 0.1uF
8
VCC
OUT1
2
7
nSLEEP
OUT2
3
4
6
IN1
GND
5
IN2
Figure 4. Simplified Layout Example
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March 2018
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