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| L6932 HIGH PERFORMANCE 2A ULDO LINEAR REGULATOR s s s s s s s s s s 2V TO 14V INPUT VOLTAGE RANGE 200m Rdson MAX. 200A QUIESCENT CURRENT AT ANY LOAD EXCELLENT LOAD AND LINE REGULATION 1.8V AND 2.5V FIXED VOLTAGE ADJUSTABLE FROM 1.2V TO 5V (L6932D1.2) 1% VOLTAGE REGULATION ACCURACY SHORT CIRCUIT PROTECTION THERMAL SHUT DOWN SO-8 (4+4) PACKAGE SO-8 (4+4) ORDERING NUMBERS: L6932D1.2 (SO-8) L6932D1.2TR (T&R) L6932D1.8 (SO-8) L6932D1.8TR (T&R) L6932D2.5 (SO-8) L6932D2.5TR (T&R) APPLICATIONS s MOTHERBOARDS s s s s s Mosfet, can be usefull for the DC-DC conversion between 2.5V and 1.8V at 2A in portable applications reducing the power dissipation. L6932 is available in 1.8V, 2.5V and adj version from 1.2V and ensure a voltage regulation accuracy of 1%. The current limit is fixed at 2.5A to control the current in short circuit condition within 8%. The current is sensed in the power mos in order to limit the power dissipation. The device is also provided of a thermal shut down that limits the internal temperature at 150C with an histeresys of 20C. L6932 provides the Enable and the Power good functions. MOBILE PC HAND-HELD INSTRUMENTS PCMCIA CARDS PROCESSORS I/O CHIPSET AND RAM SUPPLY DESCRIPTION The L6932 Ultra Low Drop Output linear regulator operates from 2V to 14V and is able to support 2A. Designed with an internal 50m N-channel TYPICAL OPERATING CIRCUIT IN VIN 2V to 14V 2 OUT 3 L6932D PGOOD 4 C1 5,6,7,8 GND EN 1 VOUT 1.8V or 2.5V C2 IN VIN 2V to 14V 2 4 OUT L6932D1.2 ADJ 3 C1 5,6,7,8 GND EN 1 VOUT 1.2V to 5V R1 C2 R2 February 2003 1/10 L6932 PIN CONNECTIONS EN IN ADJ OUT 1 2 3 4 8 7 6 5 GND GND GND GND EN IN OUT PGOOD 1 2 3 4 8 7 6 5 GND GND GND GND L6932D1.2 L6932D1.8 L6932D2.5 PIN FUNCTION N 1 2 ADJ 3 - OUT 4 - 5, 6, 7, 8 PGOOD GND Power good output. The pin is open drain and detects the output voltage. It is forced low if the output voltage is lower than 90% of the programmed voltage. Ground pin. OUT - Regulated output voltage. This pin is connected to the source of the internal N-mos. Connect this pin to a capacitor of 10F. Regulated output voltage. This pin is connected to the source of the internal N-mos. Connect this pin to a capacitor of 10F. L6232D 1.2 L6232D 1.8/2.5 Description Enables the device if connected to Vin and disables the device if forced to gnd. Supply voltage. This pin is connected to the drain of the internal N-mos. Connect this pin to a capacitor larger than 10F. - Connecting this pin to a voltage divider it is possible to programme the output voltage between 1.2V and 5V. EN IN ABSOLUTE MAXIMUM RATINGS Symbol Vin VIN and Pgood EN, OUT and ADJ Parameter Value 14.5 -0.3 to (Vin +0.3) Unit V V THERMAL DATA Symbol Rth J-amb Tmax Parameter Thermal Resistance Junction to Ambient Maximum Junction Temperature Storage Temperature Range Value 62 (*) 150 -65 to 150 Unit C/W C C Tstg (*) Measured on Demoboard with about 4 cm2 of dissipating area 2 Oz. 2/10 L6932 BLOCK DIAGRAM (Referred to the Fixed Voltage version) IN CHARGE PUMP VREF REFERENCE VREF=1.25V DRIVER CURRENT LIMIT + ERROR AMPL. OUT EN ENABLE THERMAL SENSOR 0.9 VREF + PG GND D99IN1100 ELECTRICAL CHARACTERISTCS (Tj = 25C, VIN = 5V unless otherwise specified) (*) Specification referred to Tj from -25C to 125C. Symbol Vin Vo Parameter Operating Supply Voltage Output voltage L6932D1.2 Output voltage L6932D1.8 Output voltage L6932D2.5 L6932D1.2 Line Regulation Io = 0.1A; Vin = 3.3V Io = 0.1A; Vin = 3.3V Io = 0.1A; Vin = 3.3V Vin = 2.5V 10%; Io = 10mA Vin = 3.3V 10%; Io = 10mA Vin = 5V 10%; L6932D1.8 Line Regulation Io = 10mA Vin = 2.5V 10%; Io = 10mA Vin = 3.3V 10%; Io = 10mA Vin = 5V 10%; L6932D2.5 Line Regulation L6932D1.2 Load Regulation L6932D1.8 Load Regulation L6932D2.5 Load Regulation Rdson Iocc Iq Ish Drain Source ON resistance Current limiting Quiescent current Shutdown current Ripple Rejection Ven EN Input Threshold 2V < Vin < 14V f = 120Hz, Io = 1A Vin = 5V, Vin = 2Vpp * 60 0.5 75 0.65 0.8 2.3 2.5 0.2 Vin = 5V 10%; Io = 10mA Io = 10mA Vin = 3.3V 10%; Io = 10mA Vin = 3.3V; 0.1A < Io < 2A Vin = 3.3V; 0.1A < Io < 2A Vin = 3.3V; 0.1A < Io < 2A Test Condition Min. 2 1.188 1.782 2.475 1.2 1.8 2.5 Typ. Max. 14 1.212 1.818 2.525 5 5 5 5 5 5 5 5 15 15 15 200 2.7 0.4 25 Unit V V V V mV mV mV mV mV mV mV mV mV mV mV m A mA A dB V 3/10 L6932 ELECTRICAL CHARACTERISTCS (continued) Symbol Parameter Pgood threshold Pgood Hysteresis Pgood saturation Ipgood =1mA Vo rise Test Condition Min. Typ. 90 10 0.2 0.4 Max. Unit %Vo %Vo V Figure 1. Output Voltage vs. Junction Temperature (L6932D1.2) 1.213 1.212 Figure 4. Quiescent Current vs. Junction Temperature 310 300 1.212 290 Vin=5V 1.211 V 1.211 1.210 1.210 1.209 -60 -40 -20 0 20 40 60 80 Temp [C] 100 120 140 160 250 -40 -20 0 20 40 60 Temp [C ] 80 100 120 140 Iq 280 (uA) 270 260 Figure 2. Output Voltage vs. Junction Temperature (L6932D1.8) 1.808 Figure 5. Shutdown Current vs. Junction Temperature 7.5 1.804 7 6.5 1.800 V Ishdn (uA) 6 5.5 5 4.5 Vin=5V 1.796 1.792 1.788 -60 -40 -20 0 20 40 60 80 Temp [C] 100 120 140 160 4 -40 -20 0 20 40 Temp [C ] 60 80 100 120 140 Figure 3. Output Voltage vs. Junction Temperature (L6932D2.5) 2.520 2.515 2.510 V 2.505 2.500 2.495 -60 -40 -20 0 20 40 60 80 100 120 140 160 Temp [C] 4/10 L6932 APPLICATION INFORMATIONS APPLICATION CIRCUIT In figure 6 the schematic circuit of the demoboards are shown. Figure 6. Demoboards Schematic Circuit VIN IN OUT VOUT=2.5V/1.8V 2 L6932D2.5 L6932D1.8 6 GND 3 EN C1 1 5 7 4 8 PGOOD C2 VIN IN OUT VOUT=1.2V TO 5V 2 L6932D1.2 EN C1 4 R1 ADJ 1 5 GND 6 7 3 8 R2 C2 1.2 V OUT = ------- ( R1 + R 2 ) R2 COMPONENT LIST Fixed version Reference C1 C2 Part Number C34Y5U1E106Z C34Y5U1E106Z Description 10uF, 25V 10uF, 25V Manufacturer TOKIN TOKIN Figure 7. Demoboard Layout (Fixed Version) 5/10 L6932 Adjustable version Reference C1 C2 R1 R2 Part Number C34Y5U1E106Z C34Y5U1E106Z Description 10uF, 25V 10uF, 25V 5.6K, 1%, 0.25W 3.3K, 1%, 0.25W Manufacturer TOKIN TOKIN Neohm Neohm Figure 8. Demoboard Layout (Adjustable Version) COMPONENTS SELECTION Input Capacitor The input capacitor value depends on a lot of factors such as load transient requirements, input source (battery or DC/DC converter) and its distance from the input cap. Usually a 47F is enough for any application but a much lower value can be sufficient in many cases. Output Capacitor The output capacitor choice depends basically on the load transient requirements. Tantalum, Speciality Polimer, POSCAP and aluminum capacitors are good and offer very low ESR values. Multilayer ceramic caps have the lowest ESR and can be required for particular applications. Nevertheless in several applications they are ok, the loop stability issue has to be considered (see loop stability section). Below a list of some suggested capacitor manufacturers. Manufacturer PANASONIC TAYO YUDEN TDK TOKIN SANYO PANASONIC KEMET Type CERAMIC CERAMIC CERAMIC CERAMIC POSCAP SP TANTALUM Cap Value (F) 1 to 47 1 to 47 1 to 47 1 to 47 1 to 47 1 to 47 1 to 47 4 to 16 4 to 16 4 to 16 4 to 16 4 to 16 4 to 16 4 to 16 Rated Voltage (V) 6/10 L6932 Loop Stability The stability of the loop is affected by the zero introduced by the output capacitor. The time constant of the zero is given by: T = ESR C OUT 1 F ZERO = -------------------------------------------2 ESR C OUT This zero helps to increase the phase margin of the loop until the time constant is higher than some hundreds of nsec, depending also on the output voltage and current. So, using very low ESR ceramic capacitors could produce oscillations at the output, in particular when regulating high output voltages (adjustable version). To solve this issue is sufficient to add a small capacitor (e.g. 1nF to 10nF) in parallel to the high side resistor of the external divider, as shown in figure 9. Figure 9. Compensation Network VIN=2V TO 14V IN OUT VOUT=1.2V TO 5V UP to 2A 2 L6932D1.2 EN C1 4 R1 ADJ C3 1 5 GND 6 7 3 8 R2 C2 Thermal Considerations Since the device is housed in a small SO(4+2+2) package the thermal issue can be the bottleneck of many applications. The power dissipated by the device is given by: PDISS = (VIN - VOUT) * IOUT The thermal resistance junction to ambient of the demoboard is approximately 62C/W. This mean that, considering an ambient temperature of 60C and a maximum junction temperature of 150C, the maximum power that the device can handle is 1.5W. This means that the device is able to deliver a DC output current of 2A only with a very low dropout. In many applications, high output current pulses are required. If their duration is shorter than the thermal constant time of the board, the thermal impedance (not the thermal resistance) has to be considered. In figure 10 the thermal impedance versus the duration of the current pulse for the SO(4+2+2) mounted on board is shown. 7/10 L6932 Figure 10. Thermal Impedance Considering a pulse duration of 1sec, the thermal impedance is close to 20C/W, allowing much bigger power dissipated. Example: Vin = 3.3V Vout = 1.8V Iout = 2A Pulse Duration = 1sec The power dissipated by the device is: PDISS = (VIN - VOUT) * IOUT = 1.5 * 2 3W Considering a thermal impedance of 20C/W, the maximum junction temperature will be: TJ = TA + ZTHJA * PDISS = 60 + 60 = 120C Obviously, with pulse durations longer than approximately 10sec the thermal impedance is very close to the thermal resistance (60C/W to 70C/W). 8/10 L6932 DIM. MIN. A a1 a2 a3 b b1 C c1 D (1) E e e3 F (1) L M S 3.8 0.4 4.8 5.8 0.65 0.35 0.19 0.25 0.1 mm TYP. MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 0.026 0.014 0.007 0.010 0.004 MIN. inch TYP. MAX. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 OUTLINE AND MECHANICAL DATA 45 (typ.) 5.0 6.2 1.27 3.81 4.0 1.27 0.6 8 (max.) 0.15 0.016 0.189 0.228 0.050 0.150 0.157 0.050 0.024 0.197 0.244 SO8 (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). 9/10 L6932 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com 10/10 (R) |
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