PM8834
4 A dual low-side MOSFET driver
Datasheet - production data
Applications
SMPS
DC-DC converters
Motor controllers
Line drivers
Class-D switching amplifiers
Description
The PM8834 is a flexible, high-frequency dual
low-side driver specifically designed to work with
high capacitive MOSFETs and IGBTs.
Features
Dual independent low-side MOSFET driver
with 4 A sink and source capability
Both PM8834 outputs can sink and source 4 A
independently. A higher driving current can be
obtained by connecting the two PWM outputs in
parallel.
Independent enable for each driver
Driver output parallelability to support higher
driving capability
The PM8834 provides two enable pins which can
be used to enable the operation of one or both of
the output lines.
Matched propagation delays
CMOS/TTL-compatible input levels
Wide input supply voltage range: 5 V to 18 V
The PM8834 works with a CMOS/TTL-compatible
PWM signal.
Embedded drivers with anti cross conduction
protection
The device is available in an SO8 or an MSOP8
package with an exposed pad.
Low bias switching current
Short propagation delays
Rated for a wide operative temperature range:
-40 °C to 125 °C
Industry standard SO8 package and MSOP8
with exposed pad
Table 1. Device summary
Order code
PM8834
PM8834TR
PM8834M
PM8834MTR
January 2019
This is information on a product in full production.
Package
SO8
MSOP 8L-EP
DS5945 Rev 6
Packing
Tube
Tape and reel
Tube
Tape and reel
1/22
www.st.com
Contents
PM8834
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2
Pin description and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1
6
Device description and operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1
7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1.1
PWM inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1.2
Enable pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.2
Output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.3
Parallel output operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.4
Gate driver voltage flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Design guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1
Output series resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.2
Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.3
Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22
DS5945 Rev 6
PM8834
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Single high-current (up to 8 A) low-side driver configuration . . . . . . . . . . . . . . . . . . . . . . . 11
Minimal output series resistance for safe operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Equivalent circuit for MOSFET driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Power dissipation with load of 10 nF and 2.2 gate resistor. . . . . . . . . . . . . . . . . . . . . . . 14
Power dissipation for capacitive load of 10 nF with 4.7 gate resistor . . . . . . . . . . . . . . . 14
Driver turn-on and turn-off paths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Example of placement of external components - SO8 package . . . . . . . . . . . . . . . . . . . . . 16
Example of placement of external components - MSOP8 package . . . . . . . . . . . . . . . . . . 16
SO-8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
MSOP-8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
MSOP-8L recommended footprint (dimensions are in mm) . . . . . . . . . . . . . . . . . . . . . . . . 20
DS5945 Rev 6
3/22
22
Block diagram
1
PM8834
Block diagram
Figure 1. Block diagram
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DS5945 Rev 6
PM8834
2
Pin description and connections
Pin description and connections
Figure 2. Pin connections (top view)
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2.1
Pin description
Table 2. Pin description
Pin no.
1
Name
Function
Enable input for Driver 1. Pull low to disable Driver 1 (OUT1 will be low, PWM1 will be
ignored). Even though internally pulled up to VCC with a typ. 100 k internal resistor, it is
ENABLE_1 recommended to pull high up directly to VCC externally to enable the section.
Enable pin is a device state control pin and must be set before to apply the PWM signal.
The pin features TTL/CMOS-compatible thresholds.
PWM input signal for Driver 1 featuring TTL/CMOS-compatible threshold and hysteresis.
Even though internally pulled down to GND with a 10 μA current generator, it is
recommended to pull-down to GND with an external 100 kΩ resistor.
2
PWM_1
3
GND
4
PWM_2
PWM input signal for Driver 2 featuring TTL/CMOS-compatible threshold and hysteresis.
Even though internally pulled down to GND with a 10 μA current generator, it is
recommended to pull-down to GND with an external 100 kΩ resistor.
5
OUT_2
Driver 2 output. The output stage is capable of providing up to 4 A drive current to the gate
of a power MOSFET. IGBTs are supported as well. A low ohmic value series resistor can be
useful to reduce dissipated power.
6
VCC
7
OUT_1
8
All internal references, logic and drivers are referenced to this pin. Connect to the PCB
ground plane.
PM8834 supply voltage. Bypass with low ESR MLCC capacitor to GND.
Driver 1 output. The output stage is capable of providing up to 4 A drive current to the gate
of a power MOSFET. IGBTs are supported as well. A low ohmic value series resistor can be
useful to reduce dissipated power.
Enable input for Driver 2. Pull low to disable Driver 2 (OUT2 will be low, PWM2 will be
ignored). Even though internally pulled up to VCC with a typ. 100 kinternal resistor, it is
ENABLE_2 recommended to pull high up directly to VCC externally to enable the section.
Enable pin is a device state control pin and must be set before to apply the PWM signal.
The pin features TTL/CMOS compatible thresholds.
PM8834M only
EXP PAD
The thermal pad connects the silicon substrate and makes good thermal contact with the
PCB. Use multiple vias to connect it to the GND plane.
DS5945 Rev 6
5/22
22
Thermal data
3
PM8834
Thermal data
Table 3. Thermal data
Symbol
Parameter
Value
Unit
TJop
Recommended Operating junction temperature range
-40 to 125
°C
TAmb
Recommended Operating ambient temperature range
-40 to 105
°C
SO8
RTHJA
Thermal resistance junction to ambient (device soldered
on 2s2p PC board - 67 mm x 67 mm)
85
°C/W
RTHJC
Thermal resistance junction to case
40
°C/W
PTOT
Maximum power dissipation at 70 °C (device soldered on
2s2p PC board - 67 mm x 67 mm)
0.65
W
Derating factor above 70 °C
12
mW/°C
RTHJA
Thermal resistance junction to ambient (device soldered
on 2s2p PC board - 67 mm x 67 mm)
50
°C/W
RTHJC
Thermal resistance junction to case
10
°C/W
PTOT
Maximum power dissipation at 70 °C (device soldered on
2s2p PC board - 67 mm x 67 mm)
1.1
W
Derating factor above 70 °C
20
mW/°C
DF
MSOP8
DF
Note:
Maximum power dissipation and derating factor are estimated assuming 125 °C as
maximum operating junction temperature.
Data in the table are for reference only and are highly influenced by specific application
factors like pcb layout, Cu thickness and airflow; take adequate and safe margin when using
them.
6/22
DS5945 Rev 6
PM8834
4
Absolute maximum ratings
Absolute maximum ratings
Table 4. Absolute maximum ratings
Symbol
All pins
Parameter
to GND
Value
Unit
-0.3 to 19
V
500
mA
IOUTx
DC output current
TJmax
Max Junction temperature range
-40 to 150
°C
Storage temperature range
-40 to 150
°C
2
kV
Tstg
VHBM
Note:
ESD capability, human body model
Device stresses above those listed in table may cause permanent damages.
Exposure to maximum rating conditions for extended periods may affect the device
reliability.
DS5945 Rev 6
7/22
22
Electrical specifications
PM8834
5
Electrical specifications
5.1
Electrical characteristics
Table 5. Electrical characteristics [VCC = 5 V to 18 V, Tj = -40 to 125 °C unless otherwise specified(1)]
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
Supply current and power-on
ICC
UVLOVCC
VCC supply current
OUT_1, OUT_2 = OPEN
VCC = 10 V; TJ = 25 °C
3.5
VCC turn-ON
VCC rising
4.4
VCC turn-OFF
VCC falling
3.6
mA
4.6
3.8
V
V
Input threshold
PWM_x,
ENABLE_x
Input high - VIH
Rising threshold
Input low - VIL
Falling threshold
2.2
0.8
2.5
1.1
V
V
Drivers (OUT_1, OUT_2)
RDSON_H
ISOURCE
ISINK
RDSON_L
Source resistance
Source
Sink
current(2)
current(2)
Sink resistance
VCC = 10 V; IOUT = 100 mA; TJ = 25 °C
1
VCC = 10 V; IOUT = 100 mA; full temp. range
1.3
1.5
VCC = 10 V; COUT to GND = 10 nF
4
A
VCC = 10 V; COUT to GND = 10 nF
5
A
VCC = 10 V; IOUT = 100 mA; TJ = 25 °C
0.7
VCC = 10 V; IOUT = 100 mA; full temp. range
Max OUT_x in OFF state VCC rising with slope > 2 V/ms
1
1.3
1.5
V
Switching time (PWM_1,PWM_2)
tR
Rise time
tF
Fall time
VCC = 10 V; COUT to GND = 2.5 nF
10
20
ns
VCC = 10 V; COUT to GND = 14 nF
45
75
ns
VCC = 10 V; COUT to GND = 2.5 nF
10
20
ns
VCC = 10 V; COUT to GND = 14 nF
35
75
ns
Propagation delay
tD_LH
Delay - low to high
COUT to GND = 2.5 nF
15
25
35
ns
tD_HL
Delay - high to low
COUT to GND = 2.5 nF
20
30
40
ns
5
ns
Matching between
propagation delays
-5
1. Limits guaranteed by design and statistical analysis, not production tested. Production test is done at T = 25 °C.
2. Parameter guaranteed by designed, not fully tested in production.
8/22
DS5945 Rev 6
PM8834
6
Device description and operation
Device description and operation
The 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. The PM8834
can sink and source 4 A on both low-side driver branches but a higher driving current can be
obtained by paralleling its outputs.
Even though this device has been designed to function 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 Section 7.2 on page 13.
For enhanced control of operations the PM8834 has been designed with dual independent
active-high enable pins (ENABLE_1 and ENABLE_2). Connecting these pins to the GND
pin will disable the corresponding low-side driver.
The PM8834 uses the VCC pin for supply and the GND pin for return.
The dual low-side driver has been designed to work with supply voltage in the range of 5 to
18 V.
For VCC voltages greater than the UVLO threshold (UVLOVCC), 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.
The PM8834, during VCC startup, keeps both low-side MOSFETs in an OFF state until the
UVLO threshold is reached.
The input pins (PWM_1, PWM_2, ENABLE_1 and ENABLE_2) are CMOS/TTL-compatible
and can also operate with voltages up to VCC.
The voltage level of the input pins is not allowed to be higher than VCC under any operating
condition.
6.1
Input stage
6.1.1
PWM inputs
The inputs of the PM8834 dual low-side driver are compatible to CMOS/TTL levels with the
capability to be pulled up to VCC.
The relationship between the input pins (PWM_1, PWM_2) and the corresponding PWM
output pins (OUT_1, OUT_2) is depicted in Figure 3. In the worst case, input levels above
2.5 V are recognized as high voltage and values below 0.8 V are recognized as low logic
values. Propagation delays for high-low (tD_HL) and low-high (tD_LH) and rise (tR) and fall
(tR) times have been designed to ensure operation in a fast-switching environment.
Matched propagation delay in the two branches of the PM8834 ensures symmetry in
operation and allows parallel output functionality.
Each PWM input features a 10 μA pull-down to turn off (default state) the external MOSFET
/ IGBT.
DS5945 Rev 6
9/22
22
Device description and operation
PM8834
Figure 3. Timing diagram
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6.1.2
Enable pins
The PM8834 features two independent enable signals, ENABLE_1 and ENABLE_2, to
control the operation of each low-side driver. Both enable pins are internally pulled up to
VCC with a typ. 100 k resistance and are active high. In applications where ENABLE_1
and ENABLE_2 are not in use, it is strongly recommended to connect these pins to VCC
directly or with a pull-up resistor. ENABLE_1 and ENABLE_2 are compatible to CMOS/TTL
levels and can be directly pulled up to VCC. By default, because of the internal pull-up, both
drivers are enabled. It is possible to disable one or both low-side drivers, connecting the
corresponding enable signal to GND.
The enable pins cannot be used as input driving pins, but only as device control pins; they
must be set before to apply the PWM signals; high to low transition on enable pins cannot
be simultaneous with transition edges on the PWM inputs.
The enable pins are not designed and tested in terms of matched propagation delay time
and maximum operating frequency.
6.2
Output stage
The output stage of the PM8834 makes use of ST’s proprietary lateral DMOS. Both
N-DMOS and P-DMOS have been sized to exhibit high driving peak current as well as low
ON-resistance. Typical peak current is 4 A while output resistances are 1 and 0.7 for
P-DMOS and N-DMOS resistance respectively. The device features adaptive anti cross
conduction protection. The PM8834 continuously monitors the status of the internal NDMOS and P-DMOS. During a PWM transition, before switching on the desired DMOS, the
device waits until the other DMOS is completely turned off. No static current will then flow
from VCC to GND. During VCC startup, the internal N-DMOS is kept in an OFF state: with
typical VCC rise time, with slope >2 V/ms, the OUT pins are maintained at low level under
any operating condition. For VCC startup with very smooth rising edge, with slope < 2 V/ms,
the OUT pins can track the VCC rising edge until the UVLO threshold is reached, but the
voltage reached is maintained under 1.5 V under any operating condition.
10/22
DS5945 Rev 6
PM8834
6.3
Device description and operation
Parallel output operation
For applications demanding high driving current capability (in excess of the 4 A provided by
the single section), the PM8834 allows paralleling the operation of the two drivers in order to
reach higher current, up to 8 A. This configuration is depicted in Figure 4 where both
PWM_1 and PWM_2 and OUT_1 and OUT_2 are tied together. The matching of internal
propagation delays guarantees that the two drivers are switched on and off simultaneously.
Figure 4. Single high-current (up to 8 A) low-side driver configuration
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6.4
Gate driver voltage flexibility
The PM8834 allows the user to freely select the gate drive voltage in order to optimize the
efficiency of the application. The low-side MOSFET driving voltage depends on the voltage
applied to VCC and can range between 5 V to 18 V; if above 15 V, precautions must be
taken according to the design guidelines related to the device supply voltage found in the
following section.
DS5945 Rev 6
11/22
22
Design guidelines
PM8834
7
Design guidelines
7.1
Output series resistance
An output resistance is generally introduced to allow high-frequency operation without
exceeding the maximum power dissipation of the driver package.
The value of the output resistance can be obtained as described in Section 7.2. For
applications with supply voltages (VCC) greater than 15 V, with low capacitive loads
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DS5945 Rev 6
PM8834
7.3
Design guidelines
Layout guidelines
The first priority when placing components for these applications has to be reserved to the
power section, minimizing the length of each connection and loop as much as possible. To
minimize noise and voltage spikes (also EMI and losses) power connections must be part of
a power plane and must consist of wide and thick copper traces: the loop must be
minimized.
Traces between the driver and the MOSFETs should be short and wide to minimize the
inductance of the traces, thus minimizing ringing in the driving signals. Moreover, the
number of vias needs to be minimized in order to reduce the related parasitic effect.
Small signal components and connections to critical nodes of the application as well as
bypass capacitors for the device supply are also important. Locate the bypass capacitor
(VCC capacitors) close to the device with the shortest possible loop and use wide copper
traces to minimize parasitic inductance.
To improve heat dissipation, place a copper area under the IC. This copper area may be
connected with other layers (if available) through vias to improve the thermal conductivity.
The combination of a copper pad, copper plane and vias under the driver allows the device
to reach its best thermal performance.
Figure 9. Driver turn-on and turn-off paths
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Traces between the driver and the MOSFETs should be short and wide to minimize the
inductance of the traces, thus minimizing ringing in the driving signals. Moreover, the
number of vias needs to be minimized in order to reduce the related parasitic effect.
As a general rule, place the driver no more than 1 inch away from its load (a rough
estimation for the inductance of a PCB trace 1” long is about 20 nH).
Small signal components and connections to critical nodes of the application as well as
bypass capacitors for the device supply are also important. Locate the bypass capacitor
close to the device with the shortest possible loop and use wide copper traces to minimize
the parasitic inductance. The use of low inductance SMD components such as ceramic chip
capacitors is recommended.
It is suggested to maintain separated power traces and signal traces (output and input
signals) in order to minimize the noise coupling and use star point grounding, with the
source of the MOSFET as a star point.
DS5945 Rev 6
15/22
22
Design guidelines
PM8834
Use (if available) a ground plane to provide noise shielding. Connect also the ground plane
to the source of the MOSFET with a single point: the ground plane cannot be used as a path
for any power loop.
In noisy environments, it is suggested to tie enable inputs of the driver to VCC in order to
ensure that the output is enabled and to prevent coupling noise from causing malfunction in
the output.
To improve heat dissipation, place a copper area under the IC. This copper area may be
connected with other layers (if available) through vias to improve the thermal conductivity.
The combination of a copper pad, copper plane and vias under the driver allows the device
to reach its best thermal performance.
Figure 10. Example of placement of external components - SO8 package
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Figure 11. Example of placement of external components - MSOP8 package
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PM8834
8
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK is an ST trademark.
Figure 12. SO-8 package outline
Table 6. SO-8 package mechanical data
Dimensions (mm)
Symbol
Min.
Typ.
A
Max.
1.75
A1
0.10
A2
1.25
b
0.28
0.48
c
0.17
0.23
D
4.80
4.90
5.00
E
5.80
6.00
6.20
E1
3.80
3.90
4.00
e
0.25
1.27
h
0.25
0.50
L
0.40
1.27
L1
k
1.04
0°
ccc
8°
0.10
DS5945 Rev 6
17/22
22
Package information
PM8834
Figure 13. MSOP-8 package outline
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DS5945 Rev 6
PM8834
Package information
Table 7. MSOP-8L with exposed pad package mechanical data
Dimensions (mm)
Symbol
Min.
Typ.
Max.
Ɵ1
0°
3°
6°
Ɵ2
9°
12°
15°
Ɵ3
9°
12°
15°
A
1.10
A1
0.05
0.10
0.15
A2
0.78
0.86
0.94
D
2.9
3.00
3.10
D2
2.85
2.95
3.05
E
4.75
4.90
5.05
e
0.65BSC
S
0.525BSC
D3
2.08
2.18
2.28
E5
1.63
1.73
1.73
E1
2.9
3.0
3.10
E2
2.85
2.95
3.05
E3
0.38
0.51
0.64
E4
0.38
0.51
0.64
R
0.07
0.15
0.3
R1
0.07
0.15
0.3
t1
0.23
0.31
0.39
t2
0.33
0.41
0.49
b
0.25
0.33
0.7
b1
0.25
0.30
0.35
c
0.13
0.18
0.23
c1
0.13
0.15
0.18
L
0.4
0.55
0.7
aaa
0.10
bbb
0.08
ccc
0.25
1. Dimension “D” and “D2” does not include mold flash protrusion or gate burrs.
2. Dimension “E1” and “E2” does not include interlead flash or protrusion.
3. Package outline exclusive of metal burr dimensions.
4. Dimension for “D2” and “E2” are for top package and “D” and “E1” are for bottom package.
5. Cross section A-A to be determined at 0.13 to 0.25mm from the lead tip.
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Package information
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Figure 14. MSOP-8L recommended footprint (dimensions are in mm)
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Revision history
Revision history
Table 8. Document revision history
Date
Revision
13-Oct-2008
1
Initial release.
21-Oct-2009
2
Updated Figure 1, Table 2, Table 5 and Section 6.1.2
30-Jul-2013
3
Modified Table 1, Table 4, Section 6 and Section 8: Package
information.
Minor textual changes.
4
Updated Table 2 on page 5 (updated ENABLE_1, PWM_1, PWM_2,
and ENABLE_2 pin functions).
Updated Section 6.1.2: Enable pins on page 10.
Updated Section 7.1: Output series resistance on page 12 (updated
entire section and Figure 5 - updated title and replaced by new
figure).
Updated Section 7.2: Power dissipation on page 13 and Figure 7 on
page 14 (updated title and replaced by new figure, minor text
modifications).
Updated Section 7.3: Layout guidelines on page 15.
Updated Section 8: Package information on page 17 (updated titles,
reversed order of Figure 12 and Table 6, Figure 13 and Table 7,
updated titles and headers of Table 6 and Table 7).
Minor modifications throughout document.
24-Jul-2015
5
Updated Table 7: MSOP-8L with exposed pad package mechanical
data and corresponding package outline drawings in Figure 13.
Added Figure 14.
Minor text edits.
22-Jan-2019
6
Modified the Features area of cover page. Table 1 updated. Small
updates made to Section 3, Section 4, Section 5, and Section 6 and
title of Table 5.
21-Oct-2014
Changes
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