PM8834 STMicroelectronics, PM8834 Datasheet - Page 7

• Manufacturer Part Number: PM8834
• Description: IC MOSFET DVR 4A DUAL SOIC-8
• Manufacturer: STMicroelectronics
• Type: Low Side Mosfet Driverr

Specifications of PM8834

• Configuration: Low-Side
• Input Type: PWM
• Delay Time: 35ns
• Current - Peak: 4A
• Number Of Configurations: 2
• Number Of Outputs: 2
• Voltage - Supply: 5 V ~ 18 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Product: Driver ICs - Various
• Rise Time: 10 ns
• Fall Time: 10 ns
• Propagation Delay Time: 45 ns
• Supply Voltage (max): 18 V
• Supply Voltage (min): 4.5 V
• Supply Current: 3.5 mA
• Maximum Power Dissipation: 1.4 W
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Drivers: 2
• Output Current: 500 mA
• Output Voltage: 10 V
• Wide Input Supply Voltage Range: 5 V to 18 V
• Wide Operative Temperature Range: -40 °C to 105 °C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• High Side Voltage - Max (bootstrap): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PM8834
4
4.1
4.1.1
Device description and operation
PM8834 is a dual low side driver suitable for charging and discharging large capacitive
loads like MOSFETs or IGBTs used in power supplies and DC/DC modules. PM8834 can
sink and source 4 A on both low side driver branch but higher driving current can be
obtained by paralleling its outputs.
Even though this device has been designed to cope with loads requiring high peak current
and fast switching time, the ultimate driving capability depends on the power dissipation in
the device which must be kept below the power dissipation capability of the package. This
aspect will be discussed in
For enhanced control of operation PM8834 make provision of dual independent active high
enable pins (ENABLE_1 and ENABLE_2). Connecting those pin to GND pin, will disable the
corresponding low side driver.
PM8834 uses the VCC pin for supply and GND pin for return.
The dual low-side driver has been design to work with supply voltage in the range
of 5 to 18 V.
Before VCC overcome the UVLO threshold (
side MOSFETs then, after the UVLO has crossed, the PWM input keeps the control of the
driver operations provided that the corresponding enable pin is active. Both PWM_1 and
PWM_2 are internally pulled down so if left floating the corresponding output pins are
discharged.
Input pins (PWM_1, PWM_2, ENABLE_1 and ENABLE_2) are CMOS/TTL compatible with
capability to work also with voltages up to VCC.
Input stage
PWM inputs
The input of the PM8834 dual low side driver are compatible to CMOS/TTL levels with
capability to be pulled up to VCC.
The relation between the input pins (PWM_1, PWM_2) and the corresponding PWM output
is depicted in
voltage and value below 0.8 V are recognized as low logic value.
Propagation delays for high-low (t
have been designed to ensure operation in fast switching environment.
Matching between delays in the two branches of the PM8834 ensure symmetry in the
operations and allows parallel output functionality.
Each PWM input feature 10 μA pull-down to default OFF the status of the external MOSFET
/ IGBT.
Figure
3. In the worst case, input levels above 2.5 V are recognized as high
Section
Doc ID 15086 Rev 2
D_HL
5.2.
) and low-high (t
UVLO
VCC
), PM8834 keeps firmly-OFF both low-
D_LH
Device description and operation
) and rise (t
R
) and fall (t
R
) times
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