Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsPMICsPMIC - gate drivers PWM Low side SOIC 8

This is information on a product in full production.

July 2013 DocID15086 Rev 3 1/20

PM8834

4 A dual low-side MOSFET driver

Datasheet

production data

Features

• Dual independent low-side MOSFET driver

with 4 A sink and source capability

• Independent enable for each driver

• Driver output parallelability to support higher

driving capability

• Matched propagation delays

• CMOS/TTL-compatible input levels

• Wide input supply voltage range: 5 V to 18 V

• Embedded drivers with anti cross-conduction

protection

• Low bias switching current

• Short propagation delays

• Wide operative temperature range: -40 °C to

105 °C

• Industry standard SO8 package and MSOP8

with exposed pad

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.

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.

The PM8834 provides two enable pins which can

be used to enable the operation of one or both of

the output lines.

The PM8834 works with a CMOS/TTL-compatible

PWM signal.

The device is available in an SO8 package or an

MSOP8 with exposed pad.

Table 1. Device summary

Order code Temp range Package Packing

PM8834

-40 °C - 105 °C

SO8

Tube

PM8834TR Tape and reel

PM8834M

MSOP 8L-EP

Tube

PM8834MTR Tape and reel

www.st.com

Summary of content (20 pages)

PAGE 1
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 Features • Dual independent low-side MOSFET driver with 4 A sink and source capability • Independent enable for each driver • Driver output parallelability to support higher driving capability • Matched propagation delays • CMOS/TTL-compatible input levels • Wide input supply voltage range: 5 V to 18 V • Embedded drivers wit
PAGE 2
Contents PM8834 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Pin description and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 4 2.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical specifications . . . . .
PAGE 3
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. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
Block diagram 1 PM8834 Block diagram Figure 1. Block diagram 9&& 9&& 30 (1$%/(B /RJLF 3:0B 'ULYHU 287B *1' 9&& 9&& 89/2 (1$%/(B 3:0B /RJLF 'ULYHU 287B ".
PAGE 5
PM8834 2 Pin description and connections Pin description and connections Figure 2. Pin connections (top view) (1$%/(B 3:0B *1' 3:0B 30 (1$%/(B 287B 9&& 287B $0 9 2.1 Pin description Table 2. Pin description Pin # Name Function 1 ENABLE_1 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.
PAGE 6
Pin description and connections 2.2 PM8834 Thermal data Table 3.
PAGE 7
PM8834 Electrical specifications 3 Electrical specifications 3.1 Absolute maximum ratings Table 4. Absolute maximum ratings Symbol Parameter All pins to GND IOUTx DC output current VHBM ESD capability, human body model 3.2 Value Unit -0.3 to 19 V 500 mA 2 kV Electrical characteristics Table 5. Electrical characteristics (VCC = 5 V to 18 V, Tj = -40 °C to 105 °C unless otherwise specified (1) ). Symbol Parameter Test conditions Min. Typ. Max.
PAGE 8
Electrical specifications PM8834 Table 5. Electrical characteristics (continued)(VCC = 5 V to 18 V, Tj = -40 °C to 105 °C unless otherwise specified (1)). Symbol Parameter Test conditions Min. Typ. Max. Unit 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.
PAGE 9
PM8834 4 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.
PAGE 10
Device description and operation PM8834 Figure 3. Timing diagram 9,+ 3:0B[ 9,/ 9&& 287B[ *1' W5 W'B/+ W) W'B+/ $0 9 4.1.2 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 kΩ resistance and are active high.
PAGE 11
PM8834 4.3 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.
PAGE 12
Design guidelines PM8834 5 Design guidelines 5.1 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 5.2. For applications with supply voltages (VCC) greater than 15 V, with low capacitive loads (CG<10 nF), exercise caution when designing with PM8834.
PAGE 13
PM8834 Design guidelines Equation 1 P DC = V CC ⋅ I CC • The power of the driver is defined as the power needed by the driver to continuously switch ON and OFF the external MOSFETs; it is a function of the switching frequency and total gate charge of the selected MOSFETs. It can be quantified considering that the total power PSW dissipated to switch the MOSFETs is dissipated by three main factors: external gate resistance (when present), intrinsic MOSFET resistance and intrinsic driver resistance.
PAGE 14
Design guidelines PM8834 Figure 6. Equivalent circuit for MOSFET driver 5KL 9&& 5*$7( 5, 5OR 287[ &* *1' /6 '5,9(5 026)(7 $0 9 Figure 7. Power dissipation for capacitive Figure 8. Power dissipation for capacitive load of 10 nF load of 10 nF with 4.
PAGE 15
PM8834 Design guidelines 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 9&& &*' 5*$7( 5, 287[ &*6 *1' '5,9(5 &'6 H[WHUQDO 026)(7 $0 9 Figure 10. Example of placement of external components - SO8 package 30 (1$%/(B 3:0B *1' 3:0B (1$%/(B 287B 9&& 287B $0 9 Figure 11.
PAGE 16
Package mechanical data 6 PM8834 Package mechanical data 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. Table 6. SO-8 mechanical data mm Dim. Min. Typ. A Max. 1.75 A1 0.10 0.25 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.
PAGE 17
PM8834 Package mechanical data Table 7. MSOP-8L with exposed pad mechanical data mm Dim. Min. Typ. A Max. 1.10 A1 0 0.15 A2 0.75 b 0.22 0.40 c 0.08 0.23 D 2.90 0.85 3 D3 0.95 3.10 2.16 E 4.67 4.90 5.07 E1 2.90 3 3.10 E5 1.73 e 0.65 e1 1.95 L 0.40 0.80 L2 < 0.
PAGE 18
Package mechanical data PM8834 Figure 13.
PAGE 19
PM8834 7 Revision history Revision history Table 8. Document revision history Date Revision Changes 13-Oct-2008 1 Initial release. 21-Oct-2009 2 Updated Figure 1, Table 2, Table 5 and Section 4.1.2 30-Jul-2013 3 Modified Table 1, Table 4, Section 4 and Section 6: Package mechanical data. Minor textual changes.
PAGE 20
PM8834 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.