L6226Q DMOS dual full bridge driver Features ■ Operating supply voltage from 8 to 52 V ■ 2.8 A output peak current (1.4 A DC) ■ RDS(on) 0.73 Ω typ. value @ TJ = 25 °C ■ Operating frequency up to 100 kHz ■ Programmable high side overcurrent detection and protection ■ Diagnostic output ■ Paralleled operation ■ Cross conduction protection ■ Thermal shutdown ■ Under voltage lockout ■ Integrated fast free wheeling diodes The L6226Q is a DMOS dual full bridge designed for motor control applications, realized in BCDmultipower technology, which combines isolated DMOS power transistors with CMOS and bipolar circuits on the same chip. Available in QFN32 5x5 package, the L6226Q features thermal shutdown and a non-dissipative overcurrent detection on the high side power MOSFETs plus a diagnostic output that can be easily used to implement the overcurrent protection. Applications ■ Description Bipolar stepper motor ■ Dual or quad DC motor Figure 1. Block diagram VBOOT VBOOT VBOOT VCP VSA VBOOT CHARGE PUMP PROGCLA OCDA OCDA OVER CURRENT DETECTION OUT1A 10V THERMAL PROTECTION OUT2A 10V GATE LOGIC ENA IN1A SENSEA IN2A VOLTAGE REGULATOR 10V 5V BRIDGE A OCDB OCDB OVER CURRENT DETECTION VSB PROGCLB ENB OUT1B OUT2B GATE LOGIC SENSEB IN1B IN2B BRIDGE B D99IN1088A August 2010 Doc ID 14335 Rev 5 1/29 www.st.com 29 Contents L6226Q Contents 1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.1 Power stages and charge pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.2 Logic inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.3 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.4 Non-dissipative overcurrent detection and protection . . . . . . . . . . . . . . . 12 4.5 Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6 Paralleled operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7 Output current capability and IC power dissipation . . . . . . . . . . . . . . 23 8 Thermal management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 10 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2/29 Doc ID 14335 Rev 5 L6226Q Electrical data 1 Electrical data 1.1 Absolute maximum ratings Table 1. Absolute maximum ratings Symbol Parameter VS VOD OCDA,OCDB PROGCLA, PROGCLB VBOOT VIN,VEN Parameter VSA = VSB = VS 60 V Differential voltage between VSA, OUT1A, OUT2A, SENSEA and VSB, OUT1B, OUT2B, SENSEB VSA = VSB = VS = 60 V, VSENSEA = VSENSEB = GND 60 V OCD pins voltage range -0.3 to + 10 V PROGCL pins voltage range -0.3 to + 7 V VS + 10 V -0.3 to + 7 V -1 to + 4 V VSA = VSB = VS, tPULSE < 1 ms 3.55 A RMS supply current (for each VS pin) VSA = VSB = VS 1.4 A -40 to 150 °C Bootstrap peak voltage VSA = VSB = VS Input and enable voltage range Voltage range at pins SENSEA and SENSEB IS(peak) Pulsed supply current (for each VS pin), internally limited by the overcurrent protection Tstg, TOP Storage and operating temperature range 1.2 Recommended operating conditions Table 2. Recommended operating conditions Symbol VS Parameter Parameter Supply voltage VSA = VSB = VS VOD Differential voltage between VSA, OUT1A, OUT2A, SENSEA and VSB, OUT1B, OUT2B, SENSEB VSA = VSB = VS, VSENSEA = VSENSEB VSENSEA, VSENSEB Voltage range at pins SENSEA and SENSEB (pulsed tW < trr) (DC) IOUT Unit Supply voltage VSENSEA, VSENSEB IS Value Min Max Unit 8 52 V 52 V 6 1 V V 1.4 A +125 °C 100 kHz -6 -1 RMS output current TJ Operating junction temperature fsw Switching frequency Doc ID 14335 Rev 5 -25 3/29 Electrical data 1.3 L6226Q Thermal data Table 3. Symbol Rth(JA) Thermal data Parameter Thermal resistance junction-ambient max. (1) 2 Value Unit 42 °C/W 1. Mounted on a double-layer FR4 PCB with a dissipating copper surface of 0.5 cm on the top side plus 6 cm2 ground layer connected through 18 via holes (9 below the IC). 4/29 Doc ID 14335 Rev 5 L6226Q Pin connection 2 Pin connection Figure 2. Note: Pin connection (top view) 1 The pins 2 to 8 are connected to die PAD. 2 The die PAD must be connected to GND pin. Doc ID 14335 Rev 5 5/29 Pin connection Table 4. L6226Q Pin description N° Pin Type Function 1, 21 GND GND 9 OUT1B 11 OCDB Open drain output Bridge B overcurrent detection and thermal protection pin. An internal open drain transistor pulls to GND when overcurrent on bridge B is detected or in case of thermal protection. 12 SENSEB Power supply Bridge B source pin. This pin must be connected to power ground directly or through a sensing power resistor. 13 IN1B Logic input Bridge B input 1 14 IN2B Logic input Bridge B input 2 Signal ground terminals. Power output Bridge B output 1. Bridge B overcurrent level programming. A resistor connected between this pin and ground sets the programmable current limiting value for the bridge B. By connecting this pin to ground the maximum current is set. This pin cannot be left non-connected. 15 PROGCLB R pin 16 ENB Logic input Bridge B enable. LOW logic level switches OFF all power MOSFETs of bridge B. If not used, it has to be connected to +5 V. 17 VBOOT Supply voltage Bootstrap voltage needed for driving the upper power MOSFETs of both bridge A and bridge B. 19 OUT2B 20 VSB Power supply Bridge B power supply voltage. It must be connected to the supply voltage together with pin VSA. 22 VSA Power supply Bridge A power supply voltage. It must be connected to the supply voltage together with pin VSB. 23 OUT2A 24 VCP Output 25 ENA Logic input Power output Bridge B output 2. Power output Bridge A output 2. Charge pump oscillator output. Bridge A enable. LOW logic level switches OFF all power MOSFETs of bridge A. If not used, it has to be connected to +5 V. Bridge A overcurrent level programming. A resistor connected between this pin and ground sets the programmable current limiting value for the bridge A. By connecting this pin to ground the maximum current is set. This pin cannot be left non-connected. 26 PROGCLA R pin 27 IN1A Logic input Bridge A logic input 1. 28 IN2A Logic input Bridge A logic input 2. 29 SENSEA Power supply Bridge A source pin. This pin must be connected to power ground directly or through a sensing power resistor. 30 OCDA Open drain output Bridge A overcurrent detection and thermal protection pin. An internal open drain transistor pulls to GND when overcurrent on bridge A is detected or in case of thermal protection. 31 OUT1A 6/29 Power output Bridge A output 1. Doc ID 14335 Rev 5 L6226Q 3 Electrical characteristics Electrical characteristics TA = 25 °C, Vs = 48 V, unless otherwise specified Table 5. Electrical characteristics Symbol Parameter Test condition Min Typ Max Unit VSth(ON) Turn-on threshold 5.8 6.3 6.8 V VSth(OFF) Turn-off threshold 5 5.5 6 V 5 10 mA IS TJ(OFF) All bridges OFF; TJ = -25 °C to 125 °C (1) Quiescent supply current Thermal shutdown temperature °C 165 Output DMOS transistors RDS(on) IDSS TJ = 25 °C High-side + low-side switch ON resistance TJ = 125 °C (1) 1.47 1.69 Ω 2.35 2.70 Ω 2 mA EN = Low; OUT = VS Leakage current EN = Low; OUT = GND -0.3 mA Source drain diodes VSD Forward ON voltage ISD = 2.8 A, EN = LOW 1.15 1.3 V trr Reverse recovery time If = 1.4 A 300 ns tfr Forward recovery time 200 ns Logic input VIL Low level logic input voltage -0.3 0.8 V VIH High level logic input voltage 2 7 V IIL Low level logic input current GND logic input voltage IIH High level logic input current 7 V logic input voltage -10 µA 1.8 10 µA 2.0 V Vth(ON) Turn-on input threshold Vth(OFF) Turn-off input threshold 0.8 1.3 V Vth(HYS) Input threshold hysteresis 0.25 0.5 V Switching characteristics tD(on)EN Enable to out turn ON delay time (2) ILOAD =1.4 A, resistive load tD(on)IN Input to out turn ON delay time ILOAD =1.4 A, resistive load (dead time included) tRISE Output rise time (2) (2) 500 1.9 ILOAD =1.4 A, resistive load 40 ILOAD =1.4 A, resistive load 500 tD(off)EN Enable to out turn OFF delay time tD(off)IN Input to out turn OFF delay time ILOAD =1.4 A, resistive load 500 Output fall time (2) ILOAD =1.4 A, resistive load 40 tFALL Doc ID 14335 Rev 5 800 ns µs 250 ns 800 1000 ns 800 1000 ns 250 ns 7/29 Electrical characteristics Table 5. L6226Q Electrical characteristics (continued) Symbol Parameter tdt Dead time protection fCP Charge pump frequency Test condition Min Typ 0.5 1 Max Unit µs -25 °C < TJ < 125 °C 0.6 1 MHz 0.29 2.21 2.8 +10% +10% +30% A A A 60 Ω Over current detection Is over Input supply over current detection threshold -25 °C<TJ<125 °C;RCL=39 kΩ -10% -25 °C<TJ<125 °C;RCL= 5 kΩ -10% -25 °C<TJ<125 °C;RCL= GND -30% ROPDR Open drain ON resistance I = 4 mA 40 I = 4 mA; CEN < 100 pF 200 ns I = 4 mA; CEN < 100 pF 100 ns tOCD(ON) tOCD(OFF) OCD turn-on delay time OCD turn-off delay time (3) (3) 1. Tested at 25 °C in a restricted range and guaranteed by characterization. 2. See Figure 3 3. See Figure 4 Figure 3. Switching characteristic definition (1 9WK21 9WK2)) W ,287 W ',1 W'2))(1 8/29 W5,6( W)$// Doc ID 14335 Rev 5 W'21(1 L6226Q Electrical characteristics Figure 4. Overcurrent detection timing definition ,287 2&' 7KUHVKROG W 92&' W2&'21 W2&'2)) Doc ID 14335 Rev 5 ',1 W 9/29 Circuit description L6226Q 4 Circuit description 4.1 Power stages and charge pump The L6226Q integrates two independent power MOS full bridges. Each power MOS has an RDS(on) = 0.73 Ω (typical value @ 25 °C), with intrinsic fast freewheeling diode. Cross conduction protection is achieved using a dead time (td = 1 μs typical) between the switch off and switch on of two power MOS in one leg of a bridge. Using N-channel power MOS for the upper transistors in the bridge requires a gate drive voltage above the power supply voltage. The bootstrapped (VBOOT) supply is obtained through an internal oscillator and few external components to realize a charge pump circuit as shown in Figure 5. The oscillator output (VCP) is a square wave at 600 kHz (typical) with 10 V amplitude. Recommended values/part numbers for the charge pump circuit are shown in Table 6. Table 6. Charge pump external components values Component Value CBOOT 220 nF CP 10 nF D1 1N4148 D2 1N4148 Figure 5. Charge pump circuit 96 ' &%227 ' &3 9&3 10/29 9%227 96$ 96% Doc ID 14335 Rev 5 ',1 L6226Q 4.2 Circuit description Logic inputs Pins IN1A, IN2A, IN1B, IN2B, ENA and ENB are TTL/CMOS and microcontroller compatible logic inputs. The internal structure is shown in Figure 6. Typical value for turn-on and turn-off thresholds are respectively Vthon = 1.8 V and Vthoff = 1.3 V. Pins ENA and ENB are commonly used to implement overcurrent and thermal protection by connecting them respectively to the outputs OCDA and OCDB, which are open-drain outputs. If that type of connection is chosen, some care needs to be taken in driving these pins. Two configurations are shown in Figure 7 and Figure 8. If driven by an open drain (collector) structure, a pull-up resistor REN and a capacitor CEN are connected as shown in Figure 7. If the driver is a standard push-pull structure the resistor REN and the capacitor CEN are connected as shown in Figure 8. The resistor REN should be chosen in the range from 2.2 kΩ to 180 kΩ. Recommended values for REN and CEN are respectively 100 kΩ and 5.6 nF. More information on selecting the values is found in the overcurrent protection section. Figure 6. Logic inputs internal structure 9 (6' 3527(&7,21 ',1 Figure 7. ENA and ENB pins open collector driving Figure 8. ENA and ENB pins push-pull driving Doc ID 14335 Rev 5 11/29 Circuit description 4.3 L6226Q Truth table Table 7. Truth table Inputs Outputs EN IN1 IN2 OUT1 OUT2 L X (1) X High Z (2) High Z H L L GND GND H H L Vs GND H L H GND Vs H H H Vs Vs 1. X = Don't care 2. High Z = High impedance output 4.4 Non-dissipative overcurrent detection and protection An overcurrent detection circuit (OCD) is integrated. This circuit can be used to provides protection against a short circuit to ground or between two phases of the bridge as well as a roughly regulation of the load current. With this internal over current detection, the external current sense resistor normally used and its associated power dissipation are eliminated. Figure 9 shows a simplified schematic of the overcurrent detection circuit for the bridge A. bridge B is provided of an analogous circuit. To implement the over current detection, a sensing element that delivers a small but precise fraction of the output current is implemented with each high side power MOS. Since this current is a small fraction of the output current there is very little additional power dissipation. This current is compared with an internal reference current IREF. When the output current reaches the detection threshold Isover the OCD comparator signals a fault condition. When a fault condition is detected, an internal open drain MOS with a pull down capability of 4 mA connected to OCD pin is turned on. Figure 10 shows the OCD operation. This signal can be used to regulate the output current simply by connecting the OCD pin to EN pin and adding an external R-C as shown in Figure 9. The off time before recovering normal operation can be easily programmed by means of the accurate thresholds of the logic inputs. IREF and, therefore, the output current detection threshold are selectable by RCL value, following the equations: ● Isover = 2.8 A ± 30 % at -25 °C < TJ < 125 °C if RCL = 0 Ω (PROGCL connected to GND) ● Isover = 11050 ---------------R CL ±10 % at -25 °C < TJ < 125 °C if 5 kΩ < RCL < 40 kΩ Figure 11 shows the output current protection threshold versus RCL value in the range 5 kΩ to 40 kΩ. The disable time tDISABLE before recovering normal operation can be easily programmed by means of the accurate thresholds of the logic inputs. It is affected whether by CEN and REN 12/29 Doc ID 14335 Rev 5 L6226Q Circuit description values and its magnitude is reported in Figure 12. The delay time tDELAY before turning off the bridge when an overcurrent has been detected depends only by CEN value. Its magnitude is reported in Figure 13. CEN is also used for providing immunity to pin EN against fast transient noises. Therefore the value of CEN should be chosen as big as possible according to the maximum tolerable Delay Time and the REN value should be chosen according to the desired Disable Time. The resistor REN should be chosen in the range from 2.2 kΩ to 180 kΩ. Recommended values for REN and CEN are respectively 100 kΩ and 5.6 nF that allow obtaining 200 μs disable time. Figure 9. Overcurrent protection simplified schematic Doc ID 14335 Rev 5 13/29 Circuit description L6226Q Figure 10. Overcurrent protection waveforms IOUT ISOVER VEN VDD Vth(ON) Vth(OFF) VEN(LOW) ON OCD OFF ON tDELAY BRIDGE tDISABLE OFF tOCD(ON) tEN(FALL) tOCD(OFF) tEN(RISE) tD(ON)EN tD(OFF)EN D02IN1400 Figure 11. Output current protection threshold versus RCL value 2 .5 2 .2 5 2 1 .7 5 1 .5 1 .2 5 I SOVER [A ] 1 0 .7 5 0 .5 0 .2 5 0 14/29 5k 10k 15k 20k 25k R C L [Ω ] Doc ID 14335 Rev 5 30k 35k 40k L6226Q Circuit description Figure 12. tDISABLE versus CEN and REN (VDD = 5 V) 1 .10 R EN = 220 k Ω 3 R EN = 100 k Ω R EN = 47 k Ω R EN = 33 k Ω R EN = 10 k Ω tDISABLE [µs] 100 10 1 1 10 100 C E N [nF] Figure 13. tDELAY versus CEN (VDD = 5 V) tdelay [μs] 10 1 0.1 1 10 Cen [nF] Doc ID 14335 Rev 5 100 15/29 Circuit description 4.5 L6226Q Thermal protection In addition to the overcurrent detection, the L6226Q integrates a thermal protection for preventing the device destruction in case of junction over temperature. It works sensing the die temperature by means of a sensible element integrated in the die. The device switch-off when the junction temperature reaches 165 °C (typ. value) with 15 °C hysteresis (typ. value). 16/29 Doc ID 14335 Rev 5 L6226Q 5 Application information Application information A typical application using L6226Q is shown in Figure 14. Typical component values for the application are shown in Table 8. A high quality ceramic capacitor in the range of 100 to 200 nF should be placed between the power pins (VSA and VSB) and ground near the L6226Q to improve the high frequency filtering on the power supply and reduce high frequency transients generated by the switching. The capacitors connected from the ENA/OCDA and ENB/OCDB nodes to ground set the shut down time for the bridge A and bridge B respectively when an over current is detected (see overcurrent protection). The two current sources (SENSEA and SENSEB) should be connected to power ground with a trace length as short as possible in the layout. To increase noise immunity, unused logic pins are best connected to 5 V (high logic level) or GND (low logic level) (see pin description). It is recommended to keep power ground and Signal Ground separated on PCB. Table 8. Component values for typical application Component Value C1 100 nF C2 100 µF CBOOT 220 nF CP 10 nF CENA 5.6 nF CENB 5.6 nF CREF 68 nF D1 1N4148 D2 1N4148 RCLA 5 kΩ RCLB 5 kΩ RENA 100 kΩ RENB 100 kΩ Doc ID 14335 Rev 5 17/29 Application information L6226Q Figure 14. Typical application Note: 18/29 To reduce the IC thermal resistance, therefore improve the dissipation path, the NC pins can be connected to GND. Doc ID 14335 Rev 5 L6226Q 6 Paralleled operation Paralleled operation The outputs of the L6226Q can be paralleled to increase the output current capability or reduce the power dissipation in the device at a given current level. It must be noted, however, that the internal wire bond connections from the die to the power or sense pins of the package must carry current in both of the associated half bridges. When the two halves of one full bridge (for example OUT1A and OUT2A) are connected in parallel, the peak current rating is not increased since the total current must still flow through one bond wire on the power supply or sense pin. In addition the over current detection senses the sum of the current in the upper devices of each bridge (A or B) so connecting the two halves of one bridge in parallel does not increase the over current detection threshold. For most applications the recommended configuration is half bridge 1 of bridge A paralleled with the half bridge 1 of the bridge B, and the same for the half bridges 2 as shown in Figure 15. The current in the two devices connected in parallel will share very well since the RDS(on) of the devices on the same die is well matched. When connected in this configuration the over current detection circuit, which senses the current in each bridge (A and B), will sense the current in upper devices connected in parallel independently and the sense circuit with the lowest threshold will trip first. With the enables connected in parallel, the first detection of an over current in either upper DMOS device will turn of both bridges. Assuming that the two DMOS devices share the current equally, the resulting over current detection threshold will be twice the minimum threshold set by the resistors RCLA or RCLB in Figure 15. It is recommended to use RCLA = RCLB. In this configuration the resulting bridge has the following characteristics. ● Equivalent device: full bridge ● RDS(on) 0.37 Ω typ. value @ TJ = 25 °C ● 2.8 A max RMS load current ● 5.6 A max OCD threshold Doc ID 14335 Rev 5 19/29 Paralleled operation L6226Q Figure 15. Parallel connection for higher current To operate the device in parallel and maintain a lower over current threshold, half bridge 1 and the half bridge 2 of the bridge A can be connected in parallel and the same done for the bridge B as shown in Figure 16. In this configuration, the peak current for each half bridge is still limited by the bond wires for the supply and sense pins so the dissipation in the device will be reduced, but the peak current rating is not increased. When connected in this configuration the over current detection circuit, senses the sum of the current in upper devices connected in parallel. With the enables connected in parallel, an over current will turn of both bridges. Since the circuit senses the total current in the upper devices, the over current threshold is equal to the threshold set the resistor RCLA or RCLB in Figure 16. RCLA sets the threshold when outputs OUT1A and OUT2A are high and resistor RCLB sets the threshold when outputs OUT1B and OUT2B are high. It is recommended to use RCLA = RCLB. In this configuration, the resulting bridge has the following characteristics. 20/29 ● Equivalent device: FULL BRIDGE ● RDS(on) 0.37 Ω typ. value @ TJ = 25 °C ● 1.4 A max RMS load current ● 2.8 A max OCD threshold Doc ID 14335 Rev 5 L6226Q Paralleled operation Figure 16. Parallel connection with lower overcurrent threshold It is also possible to parallel the four half bridges to obtain a simple half bridge as shown in Figure 17. In this configuration the, the over current threshold is equal to twice the minimum threshold set by the resistors RCLA or RCLB in Figure 17. It is recommended to use RCLA = RCLB. The resulting half bridge has the following characteristics. ● Equivalent device: half bridge ● RDS(on) 0.18 Ω typ. value @ TJ = 25 °C ● 2.8 A max RMS load current ● 5.6 A max OCD threshold Doc ID 14335 Rev 5 21/29 Paralleled operation L6226Q Figure 17. Paralleling the four half bridges 22/29 Doc ID 14335 Rev 5 L6226Q 7 Output current capability and IC power dissipation Output current capability and IC power dissipation In Figure 18 and Figure 19 are shown the approximate relation between the output current and the IC power dissipation using PWM current control driving two loads, for two different driving types: ● One full bridge ON at a time (Figure 18) in which only one load at a time is energized. ● Two full bridges ON at the same time (Figure 19) in which two loads at the same time are energized. For a given output current and driving type the power dissipated by the IC can be easily evaluated, in order to establish which package should be used and how large must be the on-board copper dissipating area to guarantee a safe operating junction temperature (125 °C maximum). Figure 18. IC power dissipation vs output current with one full bridge ON at a time ONE FULL BRIDGE ON AT A TIME 10 IA I OUT 8 IB 6 PD [W] I OUT 4 Test Conditions: Supply Voltage = 24V 2 0 0 0.25 0.5 0.75 1 No PW M fSW = 3 0 kHz (slow decay) 1.25 1.5 I OUT [A] Figure 19. IC power dissipation vs output current with two full bridges ON at the same time TWO FULL BRIDGES ON AT THE SAME TIME IA 10 8 I OUT IB 6 I OUT PD [W ] 4 Test Conditions: Supply Volt age =24 V 2 0 0 0.25 0.5 0.75 1 1.25 1.5 I OUT [A ] Doc ID 14335 Rev 5 No PWM f SW = 30 kHz (slow decay) 23/29 Thermal management 8 L6226Q Thermal management In most applications the power dissipation in the IC is the main factor that sets the maximum current that can be deliver by the device in a safe operating condition. Therefore, it has to be taken into account very carefully. Besides the available space on the PCB, the right package should be chosen considering the power dissipation. Heat sinking can be achieved using copper on the PCB with proper area and thickness. For instance, using a VFQFPN32L 5x5 package the typical Rth(JA) is about 42 °C/W when mounted on a double-layer FR4 PCB with a dissipating copper surface of 0.5 cm2 on the top side plus 6 cm2 ground layer connected through 18 via holes (9 below the IC). 24/29 Doc ID 14335 Rev 5 L6226Q Package mechanical data 9 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 9. VFQFPN32 5x5x1.0 pitch 0.50 Databook (mm) Dim. Min Typ Max A 0.80 0.85 0.95 b 0.18 0.25 0.30 b1 0.165 0.175 0.185 D 4.85 5.00 5.15 D2 3.00 3.10 3.20 D3 1.10 1.20 1.30 E 4.85 5.00 5.15 E2 4.20 4.30 4.40 E3 0.60 0.70 0.80 e L 0.50 0.30 ddd Note: 0.40 0.50 0.08 1 VFQFPN stands for thermally enhanced very thin profile fine pitch quad flat package no lead. Very thin profile: 0.80 < A = 1.00 mm. 2 Details of terminal 1 are optional but must be located on the top surface of the package by using either a mold or marked features. Doc ID 14335 Rev 5 25/29 Package mechanical data L6226Q Figure 20. Package dimensions 26/29 Doc ID 14335 Rev 5 L6226Q 10 Order codes Order codes Table 10. Order code Order code Package L6226Q Packaging Tube VFQFPN32 5x5x1.0 L6226QTR Tape and reel Doc ID 14335 Rev 5 27/29 Revision history 11 L6226Q Revision history Table 11. 28/29 Document revision history Date Revision Changes 18-Jan-2008 1 First release 10-Jun-2008 2 Updated: Figure 14 on page 18, Figure 15 on page 20, Figure 16 on page 21 and Figure 17 on page 22 Added: Note 1 on page 4 28-Jan-2009 3 Updated value in Table 3: Thermal data on page 4 23-Sep-2009 4 Updated value in Table 1: Absolute maximum ratings on page 3 30-Aug-2010 5 Updated Table 10 Doc ID 14335 Rev 5 L6226Q 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. 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