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L6205
DMOS DUAL FULL BRIDGE DRIVER
s s s s s s s s s s
OPERATING SUPPLY VOLTAGE FROM 8 TO 52V 5.6A OUTPUT PEAK CURRENT (2.8A DC) RDS(ON) 0.3 TYP. VALUE @ Tj = 25 C OPERATING FREQUENCY UP TO 100KHz NON DISSIPATIVE OVERCURRENT PROTECTION PARALLELED OPERATION CROSS CONDUCTION PROTECTION THERMAL SHUTDOWN UNDER VOLTAGE LOCKOUT INTEGRATED FAST FREE WHEELING DIODES
PowerDIP20 (16+2+2)
PowerSO20
SO20 (16+2+2)
ORDERING NUMBERS: L6205N (PowerDIP20) L6205PD (PowerSO20) L6205D (SO20)
TYPICAL APPLICATIONS s BIPOLAR STEPPER MOTOR s DUAL OR QUAD DC MOTOR DESCRIPTION The L6205 is a DMOS Dual Full Bridge designed for motor control applications, realized in MultiPowerBLOCK DIAGRAM
BCD technology, which combines isolated DMOS Power Transistors with CMOS and bipolar circuits on the same chip. Available in PowerDIP20 (16+2+2), PowerSO20 and SO20(16+2+2) packages, the L6205 features a non-dissipative protection of the high side PowerMOSFETs and thermal shutdown.
VBOOT
VBOOT VBOOT VBOOT CHARGE PUMP OVER CURRENT DETECTION 10V 10V
VSA
VCP
OCDA
OUT1A OUT2A
THERMAL PROTECTION ENA IN1A IN2A VOLTAGE REGULATOR 10V 5V GATE LOGIC
SENSEA
BRIDGE A OVER CURRENT DETECTION
OCDB
VSB
OUT1B ENB IN1B IN2B BRIDGE B GATE LOGIC OUT2B SENSEB
D99IN1091A
March 2003
1/21
L6205
ABSOLUTE MAXIMUM RATINGS
Symbol VS VOD Parameter Supply Voltage Differential Voltage between VSA, OUT1A, OUT2A, SENSEA and VSB, OUT1B, OUT2B, SENSEB Bootstrap Peak Voltage Input and Enable Voltage Range Voltage Range at pins SENSEA and SENSEB Pulsed Supply Current (for each VS pin), internally limited by the overcurrent protection RMS Supply Current (for each VS pin) Storage and Operating Temperature Range VSA = VSB = VS; tPULSE < 1ms VSA = VSB = VS Test conditions VSA = VSB = VS VSA = VSB = VS = 60V; VSENSEA = VSENSEB = GND VSA = VSB = VS Value 60 60 Unit V V
VBOOT VIN,VEN VSENSEA, VSENSEB IS(peak)
VS + 10 -0.3 to +7 -1 to +4 7.1
V V V A
IS Tstg, TOP
2.8 -40 to 150
A C
RECOMMENDED OPERATING CONDITIONS
Symbol VS VOD Parameter Supply Voltage Differential Voltage Between VSA, OUT1A, OUT2A, SENSEA and VSB, OUT1B, OUT2B, SENSEB Voltage Range at pins SENSEA and SENSEB RMS Output Current Operating Junction Temperature Switching Frequency -25 Test Conditions VSA = VSB = VS VSA = VSB = VS; VSENSEA = VSENSEB (pulsed tW < trr) (DC) -6 -1 MIN 8 MAX 52 52 Unit V V
VSENSEA, VSENSEB IOUT Tj fsw
6 1 2.8 +125 100
V V A C KHz
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L6205
THERMAL DATA
Symbol Rth-j-pins Rth-j-case Rth-j-amb1 Rth-j-amb1 Rth-j-amb1 Rth-j-amb2
(1) (2) (3) (4)
Description MaximumThermal Resistance Junction-Pins Maximum Thermal Resistance Junction-Case MaximumThermal Resistance Junction-Ambient
1
PowerDIP20 12 40 56
SO20 14 51 77
PowerSO20 1 35 15 62
Unit C/W C/W C/W C/W C/W C/W
Maximum Thermal Resistance Junction-Ambient 2 MaximumThermal Resistance Junction-Ambient 3 Maximum Thermal Resistance Junction-Ambient 4
Mounted on a multi-layer FR4 PCB with a dissipating copper surface on the bottom side of 6cm2 (with a thickness of 35m). Mounted on a multi-layer FR4 PCB with a dissipating copper surface on the top side of 6cm2 (with a thickness of 35m). Mounted on a multi-layer FR4 PCB with a dissipating copper surface on the top side of 6cm2 (with a thickness of 35m), 16 via holes and a ground layer. Mounted on a multi-layer FR4 PCB without any heat sinking surface on the board.
PIN CONNECTIONS (Top View)
IN1A IN2A SENSEA OUT1A GND GND OUT1B SENSEB IN1B IN2B
1 2 3 4 5 6 7 8 9 10
D99IN1093A
20 19 18 17 16 15 14 13 12 11
ENA VCP OUT2A VSA GND GND VSB OUT2B VBOOT ENB
GND VSA OUT2A VCP ENA IN1A IN2A SENSEA OUT1A GND
1 2 3 4 5 6 7 8 9 10
D99IN1092A
20 19 18 17 16 15 14 13 12 11
GND VSB OUT2B VBOOT ENB IN2B IN1B SENSEB OUT1B GND
PowerDIP20/SO20
PowerSO20 (5)
(5)
The slug is internally connected to pins 1,10,11 and 20 (GND pins).
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L6205
PIN DESCRIPTION
PACKAGE SO20/ PowerDIP20 PIN # 1 2 3 4 5, 6, 15, 16 PowerSO20 PIN # 6 7 8 9 1, 10, 11, 20 12 13 14 15 16 IN1A IN2A SENSEA OUT1A GND Logic Input Logic Input Power Supply Power Output GND Bridge A Logic Input 1. Bridge A Logic Input 2. Bridge A Source Pin. This pin must be connected to Power Ground directly or through a sensing power resistor. Bridge A Output 1. Signal Ground terminals. In PowerDIP and SO packages, these pins are also used for heat dissipation toward the PCB. Bridge B Output 1. Bridge B Source Pin. This pin must be connected to Power Ground directly or through a sensing power resistor. Bridge B Logic Input 1. Bridge B Logic Input 2. Bridge B Enable. LOW logic level switches OFF all Power MOSFETs of Bridge B. This pin is also connected to the collector of the Overcurrent and Thermal Protection transistor to implement over current protection. If not used, it has to be connected to +5V through a resistor. Bootstrap Voltage needed for driving the upper PowerMOSFETs of both Bridge A and Bridge B. Bridge B Output 2. Bridge B Power Supply Voltage. It must be connected to the supply voltage together with pin VSA. Bridge A Power Supply Voltage. It must be connected to the supply voltage together with pin VSB. Bridge A Output 2. Charge Pump Oscillator Output. Bridge A Enable. LOW logic level switches OFF all Power MOSFETs of Bridge A. This pin is also connected to the collector of the Overcurrent and Thermal Protection transistor to implement over current protection. If not used, it has to be connected to +5V through a resistor. Name Type Function
7 8 9 10 11
OUT1B SENSEB IN1B IN2B ENB
Power Output Power Supply Logic Input Logic Input Logic Input (6)
12 13 14 17 18 19 20
17 18 19 2 3 4 5
VBOOT OUT2B VSB VSA OUT2A VCP ENA
Supply Voltage Power Output Power Supply Power Supply Power Output Output Logic Input (6)
(6) Also connected at the output drain of the Overcurrent and Thermal protection MOSFET. Therefore, it has to be driven putting in series a
resistor with a value in the range of 202k - 47K, recommended 33k
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L6205
ELECTRICAL CHARACTERISTICS (Tamb = 25 C, Vs = 48V, unless otherwise specified)
Symbol Parameter Test Conditions Min 6.6 5.6 All Bridges OFF; Tj = -25C to 125C (7) Typ 7 6 5 Max 7.4 6.4 10 Unit V V mA C
VSth(ON) Turn-on Threshold VSth(OFF) Turn-off Threshold IS Quiescent Supply Current
Tj(OFF)
Thermal Shutdown Temperature
165
Output DMOS Transistors RDS(ON) High-Side Switch ON Resistance Tj = 25 C Tj =125 C (7) Low-Side Switch ON Resistance Tj = 25 C Tj =125 C (7) IDSS Leakage Current EN = Low; OUT = VS EN = Low; OUT = GND Source Drain Diodes VSD trr tfr Forward ON Voltage Reverse Recovery Time Forward Recovery Time ISD = 2.8A, EN = LOW If = 2.8A 1.15 300 200 1.3 V ns ns -0.15 0.34 0.53 0.28 0.47 0.4 0.59 0.34 0.53 2 mA mA
Logic Input VIL VIH IIL IIH Vth(ON) Vth(OFF) Vth(HYS) Low level logic input voltage High level logic input voltage Low Level Logic Input Current High Level Logic Input Current Turn-on Input Threshold Turn-off Input Threshold Input Threshold Hysteresis 0.8 0.25 GND Logic Input Voltage 7V Logic Input Voltage 1.8 1.3 0.5 -0.3 2 -10 10 2.0 0.8 7 V V A A V V V
Switching Characteristics tD(on)EN tD(on)IN tRISE tD(off)EN Enable to out turn ON delay time (8) Input to out turn ON delay time Output rise time(8) ILOAD =2.8A, Resistive Load ILOAD =2.8A, Resistive Load (dead time included) ILOAD =2.8A, Resistive Load 40 300 550 100 250 1.6 250 800 400 ns s ns ns
Enable to out turn OFF delay time (8) ILOAD =2.8A, Resistive Load
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L6205
ELECTRICAL CHARACTERISTICS (continued) (Tamb = 25 C, Vs = 48V, unless otherwise specified)
Symbol tD(off)IN tFALL tdt fCP Parameter Input to out turn OFF delay time Output Fall Time (8) Dead Time Protection Charge pump frequency -25COver Current Protection ISOVER ROPDR Input Supply Overcurrent Protection Threshold Open Drain ON Resistance Tj = -25C to 125C (7) I = 4mA I = 4mA; CEN < 100pF I = 4mA; CEN < 100pF 4 5.6 40 200 100 7.1 60 A ns ns
tOCD(ON) OCD Turn-on Delay Time (9) tOCD(OFF) OCD Turn-off Delay Time (9)
(7) (8) (9)
Tested at 25C in a restricted range and guaranteed by characterization. See Fig. 1. See Fig. 2.
Figure 1. Switching Characteristic Definition
EN
Vth(ON) Vth(OFF) t IOUT 90%
10%
D01IN1316
t tFALL tD(OFF)EN tD(ON)EN tRISE
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L6205
Figure 2. Overcurrent Detection Timing Definition
IOUT ISOVER
ON BRIDGE OFF VEN 90%
10% tOCD(ON) tOCD(OFF)
D02IN1399
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L6205
CIRCUIT DESCRIPTION POWER STAGES and CHARGE PUMP The L6205 integrates two independent Power MOS Full Bridges. Each Power MOS has an Rdson=0.3ohm (typical value @ 25C), with intrinsic fast freewheeling diode. Cross conduction protection is achieved using a dead time (td = 1s 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 3. The oscillator output (VCP) is a square wave at 600kHz (typical) with 10V amplitude. Recommended values/part numbers for the charge pump circuit are shown in Table1. Table 1. Charge Pump External Components Values
CBOOT CP RP D1 D2 220nF 10nF 100 1N4148 1N4148
OPEN COLLECTOR OUTPUT
(collector) structure, a pull-up resistor REN and a capacitor CEN are connected as shown in Fig. 5. If the driver is a standard Push-Pull structure the resistor REN and the capacitor CEN are connected as shown in Fig. 6. The resistor REN should be chosen in the range from 2.2k to 47K. Recommended values for REN and CEN are respectively 33K and 10nF. More information on selecting the values is found in the Overcurrent Protection section. Figure 4. Logic Inputs Internal Structure
5V
ESD PROTECTION
D01IN1329
Figure 5. ENA and ENB Pins Open Collector Driving
5V REN ENA or ENB CEN
D02IN1349
5V
Figure 3. Charge Pump Circuit
VS D1 D2 RP CP VCP VBOOT VSA VSB
D01IN1328
CBOOT
Figure 6. ENA and ENB Pins Push-Pull Driving
5V REN
PUSH-PULL OUTPUT
ENA or ENB CEN
D02IN1350
LOGIC INPUTS Pins IN1A, IN2A, IN1B and IN2B are TTL/CMOS and C compatible logic inputs. The internal structure is shown in Fig. 4. Typical value for turn-on and turn-off thresholds are respectively Vthon=1.8V and Vthoff=1.3V. Pins ENA and ENB have identical input structure with the exception that the drains of the Overcurrent and thermal protection MOSFETs (one for the Bridge A and one for the Bridge B) are also connected to these pins. Due to these connections some care needs to be taken in driving these pins. The ENA and ENB inputs may be driven in one of two configurations as shown in figures 5 or 6. If driven by an open drain
8/21
TRUTH TABLE
INPUTS EN L H H H H IN1 X L H L H IN2 X L L H H OUTPUTS OUT1 High Z GND Vs GND Vs OUT2 High Z GND GND Vs Vs
X
= Don't care
High Z = High Impedance Output
L6205
NON-DISSIPATIVE OVERCURRENT PROTECTION The L6205 integrates an Overcurrent Detection Circuit (OCD). This circuit provides protection against a short circuit to ground or between two phases of the bridge. With this internal over current detection, the external current sense resistor normally used and its associated power dissipation are eliminated. Figure 7 shows a simplified schematic of the overcurrent detection 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 in one bridge reaches the detection threshold (typically 5.6A) the relative OCD comparator signals a fault condition. When a fault condition is detected, the EN pin is pulled below the turn off threshold (1.3V typical) by an internal open drain MOS with a pull down capability of 4mA. By using an external R-C on the EN pin, the off time before recovering normal operation can be easily programmed by means of the accurate thresholds of the logic inputs. Figure 7. Overcurrent Protection Simplified Schematic
OUT1A POWER SENSE 1 cell I1A POWER DMOS n cells I2A POWER DMOS n cells POWER SENSE 1 cell VSA OUT2A HIGH SIDE DMOSs OF THE BRIDGE A
TO GATE LOGIC
C or LOGIC
+
OCD COMPARATOR I1A / n (I1A+I2A) / n I2A / n
+5V REN CEN ENA RDS(ON) 40 TYP.
INTERNAL OPEN-DRAIN
IREF
OVER TEMPERATURE
D02IN1353
Figure 8 shows the Overcurrent Detection operation. 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 values and its magnitude is reported in Figure 9. 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 10. 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 2.2K to 47K. Recommended values for REN and CEN are respectively 33K and 10nF that allow obtaining 100s Disable Time.
9/21
L6205
Figure 8. Overcurrent Protection Waveforms
IOUT ISOVER
VEN VDD Vth(ON) Vth(OFF) VEN(LOW)
ON OCD OFF ON BRIDGE OFF tOCD(ON) tEN(FALL) tD(OFF)EN tOCD(OFF) tEN(RISE) tD(ON)EN
D02IN1400
tDELAY
tDISABLE
10/21
L6205
Figure 9. tDISABLE versus CEN and REN (VDD = 5V).
1 .10
3
REN = 47k REN = 33k
100 tdisable [us]
REN = 10k
10
REN = 3.3k REN = 2.2k
1
1
10 Cen [nF]
100
Figure 10. tDELAY versus CEN (VDD = 5V).
10
tdelay [s]
1
0.1
1
10 Cen [nF]
100
THERMAL PROTECTION In addition to the Ovecurrent Protection, the L6205 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 165C (typ. value) with 15C hysteresis (typ. value).
11/21
L6205
APPLICATION INFORMATION A typical application using L6205 is shown in Fig. 11. Typical component values for the application are shown in Table 2. 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 L6205 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 and ENB inputs to ground set the shut down time for the Brgidge 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 (except ENA and ENB) are best connected to 5V (High Logic Level) or GND (Low Logic Level) (see pin description). It is recommended to keep Power Ground, Signal Ground and Charge Pump Ground (low side of CBOOT capacitor) separated on PCB. Table 2. Component Values for Typical Application
C1 C2 CBOOT CP CENA CENB 100uF 100nF 220nF 10nF 10nF 10nF D1 D2 RENA RENB RP 1N4148 1N4148 33k 33k 100
Figure 11. Typical Application
+ VS 8-52VDC VSA C1 C2 D1 VSB 17 14 ENA RENA ENABLEA CENA ENB RENB ENABLEB CENB 12 3 8 9 10 1 4 18 2 16 7 13 15 6 5 IN1B IN2B IN1A IN2A
20
POWER GROUND -
RP D2
VCP CP VBOOT SENSEA SENSEB
19
11
SIGNAL GROUND
CBOOT
IN1B IN2B IN1A IN2A
LOADA
OUT1A OUT2A
LOADB
OUT1B OUT2B
GND GND GND GND
D02IN1345
12/21
L6205
PARALLELED OPERATION The outputs of the L6205 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 12. 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. In this configuration the resulting Bridge has the following characteristics. - Equivalent Device: FULL BRIDGE - RDS(ON) 0.15 Typ. Value @ TJ = 25C - 5.6A max RMS Load Current - 11.2A OCD Threshold Figure 12. Parallel connection for higher current
+ VS 8-52VDC VSA C1 C2 D1 VSB 17 14 11 20 RP D2 CP VBOOT SENSEA SENSEB OUT1A OUT2A LOAD OUT1B OUT2B 12 3 8 4 18 7 13 1 2 9 10 16 15 6 5 IN1A IN2A IN1B IN2B GND GND GND GND
D02IN1359
ENB ENA REN EN CEN
POWER GROUND -
VCP
19
SIGNAL GROUND
CBOOT
IN1
IN2
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 13. 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. This configuration, the resulting bridge has the following characteristics. - Equivalent Device: FULL BRIDGE - RDS(ON) 0.15 Typ. Value @ TJ = 25C - 2.8A max RMS Load Current - 5.6A OCD Threshold
13/21
L6205
Figure 13. Parallel connection with lower Overcurrent Threshold
+ VS 8-52VDC VSA C1 C2 D1 VSB 17 14 20 ENA ENB REN EN CEN IN1A IN2A IN1B IN2B GND GND GND GND
D02IN1360
POWER GROUND -
RP D2 CP
VCP
19
11
SIGNAL GROUND
CBOOT
VBOOT SENSEA SENSEB OUT1A OUT2A
12 3 8 4 18 7 13
1 2 9 10 16 15 6 5
INA INB
LOAD
OUT1B OUT2B
It is also possible to parallel the four Half Bridges to obtain a simple Half Bridge as shown in Fig. 14 The resulting half bridge has the following characteristics. - Equivalent Device: HALF BRIDGE - RDS(ON) 0.075 Typ. Value @ TJ = 25C - 5.6A max RMS Load Current - 11.2A OCD Threshold Figure 14. Paralleling the four Half Bridges
+ VS 8-52VDC VSA C1 C2 D1 VSB 17 14 11 20 RP D2 CP VBOOT SENSEA SENSEB OUT1A OUT2A LOAD OUT1B OUT2B 12 3 8 4 18 1 2 VCP 19 IN1A IN2A IN1B IN2B GND GND GND GND
D02IN1366
ENB ENA REN EN CEN
POWER GROUND -
SIGNAL GROUND
CBOOT
IN
9 10 16 15
7 13
6 5
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L6205
OUTPUT CURRENT CAPABILITY AND IC POWER DISSIPATION In Fig. 15 and Fig. 16 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 (Fig. 15) in which only one load at a time is energized. - Two Full Bridges ON at the same time (Fig. 16) 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 (125C maximum). Figure 15. IC Power Dissipation versus Output Current with One Full Bridge ON at a time.
ONE FULL BRIDGE ON AT A TIME
10 8 6
IA IB
I OUT
PD [W]
4 2 0
I OUT Test Conditions: Supply Voltage = 24V No PW M fSW = 30 kHz (slow decay)
0
0.5
1
1.5
2
2.5
3
I OUT [A]
Figure 16. IC Power Dissipation versus Output Current with Two Full Bridges ON at the same time.
TWO FULL BRIDGES ON AT THE SAME TIME
10 8 6
IA
I OUT
IB I OUT
PD [W ]
4 2 0
Test Conditions: Supply Voltage = 24V
0 0.5 1 1.5 2 2.5 3
I OUT [A ]
No PWM f SW = 30 kHz (slow decay)
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. Figures 18, 19 and 20 show the Junction-toAmbient Thermal Resistance values for the PowerSO20, PowerDIP20 and SO20 packages. For instance, using a PowerSO package with copper slug soldered on a 1.5 mm copper thickness FR4 board with 6cm2 dissipating footprint (copper thickness of 35m), the Rth j-amb is about 35C/W. Fig. 17 shows mounting methods for this package. Using a multi-layer board with vias to a ground plane, thermal impedance can be reduced down to 15C/W.
15/21
L6205
Figure 17. Mounting the PowerSO package.
Slug soldered to PCB with dissipating area
Slug soldered to PCB with dissipating area plus ground layer
Slug soldered to PCB with dissipating area plus ground layer contacted through via holes
Figure 18. PowerSO20 Junction-Ambient thermal resistance versus on-board copper area.
C / W
43
38
33
W ith o ut G ro u nd La yer
28
W ith Gro un d La yer W ith Gro un d La yer+ 16 via H o le s
23
18
On-Board Copper Area
13 1 2 3 4 5 6 7 8 9 10 11 12 13
s q. cm
Figure 19. PowerDIP20 Junction-Ambient thermal resistance versus on-board copper area.
C / W
42 41
Copper Area is on Bottom Side
On-Board Copper Area
40 39 38 37 36 35 34 33 1 2 3 4 5 6 7 8 9 10 11 12
s q . cm
Copper Area is on Top Side
Figure 20. SO20 Junction-Ambient thermal resistance versus on-board copper area.
C / W 68 66 64 62 60 58 56 54 52 50 48 1 2 3 4 5 6 7 8 9 10 11 12 s q. cm
C o pp er A re a is o n T op S id e
On-Board Copper Area
16/21
L6205
Figure 21. Typical Quiescent Current vs. Supply Voltage
Iq [m A] 5.6
Figure 24. Typical High-Side RDS(ON) vs. Supply Voltage
RDS(ON) []
fsw = 1kHz
Tj = 25C Tj = 85C Tj = 125C
0.380 0.376 0.372 0.368 0.364 0.360 0.356 0.352 0.348 0.344 0.340 0.336
5.4
Tj = 25C
5.2
5.0
4.8
4.6 0 10 20 30 V S [V] 40 50 60
0
5
10
15
VS [V]
20
25
30
Figure 22. Normalized Typical Quiescent Current vs. Switching Frequency
Iq / (Iq @ 1 kHz)
Figure 25. Normalized RDS(ON) vs.Junction Temperature (typical value)
R DS(ON) / (R DS(ON) @ 25 C ) 1.8
1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0 20 40
fSW [kHz]
1.6
1.4
1.2
1.0
0.8
60
80
100
0
20
40
60
80
100
120
140
Tj [C]
Figure 23. Typical Low-Side RDS(ON) vs. Supply Voltage
R DS(ON) [] 0.300 0.296
Tj = 25C
Figure 26. Typical Drain-Source Diode Forward ON Characteristic
ISD [A]
3.0 Tj = 25C 2.5 2.0 1.5 1.0 0.5 0.0 700
0.292 0.288 0.284 0.280 0.276 0 5 10 15 V S [V] 20 25 30
800
900
1000
VSD [mV]
1100
1200
1300
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L6205
mm MIN. 0.1 0 0.4 0.23 15.8 9.4 13.9 1.27 11.43 10.9 5.8 0 15.5 0.8 11.1 2.9 6.2 0.1 15.9 1.1 1.1 0.031 8 (typ.) 8 (max.) 10 0.394 0.228 0.000 0.610 0.429 TYP. MAX. 3.6 0.3 3.3 0.1 0.53 0.32 16 9.8 14.5 0.000 0.016 0.009 0.622 0.370 0.547 0.050 0.450 0.437 0.114 0.244 0.004 0.626 0.043 0.043 JEDEC MO-166 0.004 MIN. inch TYP. MAX. 0.142 0.012 0.130 0.004 0.021 0.013 0.630 0.386 0.570
Weight: 1.9gr
DIM. A a1 a2 a3 b c D (1) D1 E e e3 E1 (1) E2 E3 G H h L N S T
OUTLINE AND MECHANICAL DATA
(1) "D and E1" do not include mold flash or protusions. - Mold flash or protusions shall not exceed 0.15mm (0.006") - Critical dimensions: "E", "G" and "a3".
PowerSO20
N
N a2 b e A
R
c DETAIL B a1 E DETAIL A
DETAIL A e3 H
lead
D a3 DETAIL B
20 11
Gage Plane 0.35
slug
-C-
S E2 T E1 BOTTOM VIEW
L
SEATING PLANE G C
(COPLANARITY)
E3
1 10
h x 45
PSO20MEC
D1
0056635
18/21
L6205
DIM. MIN. a1 B b b1 D E e e3 F I L Z 0.38 0.51 0.85
mm TYP. MAX. MIN. 0.020 1.40 0.50 0.50 24.80 8.80 2.54 22.86 7.10 5.10 3.30 1.27 0.015 0.033
inch TYP. MAX.
OUTLINE AND MECHANICAL DATA
0.055 0.020 0.020 0.976 0.346 0.100 0.900 0.280 0.201 0.130
Powerdip 20
0.050
19/21
L6205
mm DIM. MIN. A A1 B C D E e H h L K 10 0.25 0.4 2.35 0.1 0.33 0.23 12.6 7.4 1.27 10.65 0.75 1.27 0.394 0.010 0.016 TYP. MAX. 2.65 0.3 0.51 0.32 13 7.6 MIN. 0.093 0.004 0.013 0.009 0.496 0.291
inch TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0.050 0.419 0.030 0.050
OUTLINE AND MECHANICAL DATA
SO20
0 (min.)8 (max.)
L
h x 45
A B e K H D A1 C
20
11 E
1
0 1
SO20MEC
20/21
L6205
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(R)
21/21

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