L6932 STMICROELECTRONICS | Alldatasheet

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Technical content

■ 2V TO 14V INPUT VOLTAGE RANGE ■ 200m Ω Rdson MAX. ■ 200µA 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

APPLICATIONS

■ MOTHERBOARDS ■ MOBILE PC ■ HAND-HELD INSTRUMENTS ■ PCMCIA CARDS ■ PROCESSORS I/O ■ CHIPSET AND RAM SUPPLY

DESCRIPTION

The L6932 Ultra Low Drop Output linear regulator op- erates from 2V to 14V and is able to support 2A. De- signed with an internal 50m Ω N-channel Mosfet, can be usefull for the DC-DC conversion be- tween 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 150°C with an histeresys of 20°C. L6932 provides the Enable and the Power good functions. 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) HIGH PERFORMANCE 2A ULDO LINEAR REGULATOR TYPICAL OPERATING CIRCUIT C1 C2 VOUT 1.8V or 2.5V VIN 2V to 14V IN GND OUT L6932D 5,6,7,8 PGOOD EN VOUT 1.2V to 5V VIN 2V to 14V IN GND OUT L6932D1.2 5,6,7,8 ADJ EN

(*) Measured on Demoboard with about 4 cm2 of dissipating area 2 Oz. N° L6232D 1.2 L6232D 1.8/2.5 Description 1 EN Enables the device if connected to Vin and disables the device if forced to gnd. 2 IN Supply voltage. This pin is connected to the drain of the internal N-mos. Connect this pin to a capacitor larger than 10µF. ADJ – Connecting this pin to a voltage divider it is possible to programme the output voltage between 1.2V and 5V. – OUT Regulated output voltage. This pin is connected to the source of the internal N-mos. Connect this pin to a capacitor of 10µF. OUT – Regulated output voltage. This pin is connected to the source of the internal N-mos. Connect this pin to a capacitor of 10µF. – PGOOD 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. 5, 6, 7, 8 GND Ground pin. Symbol Parameter Value Unit Vin VIN and Pgood 14.5 V EN, OUT and ADJ -0.3 to (V in +0.3) V Symbol Parameter Value Unit R th J-amb Thermal Resistance Junction to Ambient 62 (*) °C/W Tmax Maximum Junction Temperature 150 °C Tstg Storage Temperature Range -65 to 150 °C L6932D1.2 EN OUT 5 GND ADJ IN GND GND GND EN PGOOD 5 GND OUT IN GND GND GND L6932D1.8 L6932D2.5

BLOCK DIAGRAM (Referred to the Fixed Voltage version) ELECTRICAL CHARACTERISTCS (Tj = 25°C, VIN = 5V unless otherwise specified) (*) Specification referred to Tj from -25°C to 125°C. Symbol Parameter Test Condition Min. Typ. Max. Unit Vin Operating Supply Voltage 2 14 V L6932D1.2 Line Regulation Vin = 2.5V ±10%; Io = 10mA 5 mV Vin = 3.3V ±10%; Io = 10mA 5 mV Vin = 5V ±10%; Io = 10mA 5 mV L6932D1.8 Line Regulation Vin = 2.5V ±10%; Io = 10mA 5 mV Vin = 3.3V ±10%; Io = 10mA 5 mV Vin = 5V ±10%; Io = 10mA 5 mV L6932D2.5 Line Regulation Vin = 3.3V ±10%; Io = 10mA 5 mV Vin = 5V ±10%; Io = 10mA 5 mV L6932D1.2 Load Regulation V in = 3.3V; 0.1A < Io < 2A 15 mV L6932D1.8 Load Regulation V in = 3.3V; 0.1A < Io < 2A 15 mV L6932D2.5 Load Regulation V in = 3.3V; 0.1A < Io < 2A 15 mV R dson Drain Source ON resistance 200 m Ω Iocc Current limiting 2.3 2.5 2.7 A Iq Quiescent current 0.2 0.4 mA Ish Shutdown current 2V < V in < 14V * 25 µA Ripple Rejection f = 120Hz, I o = 1A Vin = 5V, ΔVin = 2Vpp 60 75 dB Ven EN Input Threshold 0.5 0.65 0.8 V REFERENCE VREF=1.25V CURRENT LIMIT THERMAL SENSORENABLEEN IN OUT PG GND CHARGE PUMP ERROR AMPL. DRIVERVREF

0.9 VREF

Figure 8. Demoboard Layout (Adjustable Version) much lower value can be sufficient in many cases. 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. 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.

The stability of the loop is affected by the zero introduced by the output capacitor. of nsec, depending also on the output voltage and current. high output voltages (adjustable version). the external divider, as shown in figure 9. Figure 9. Compensation Network 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. stant time of the board, the thermal impedance (not the thermal resistance) has to be considered.

Figure 10. Thermal Impedance thermal resistance (60°C/W to 70°C/W).

DIM. mm inch A 1.75 0.069 a1 0.1 0.25 0.004 0.010 a2 1.65 0.065 a3 0.65 0.85 0.026 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.020 c1 45 ° (typ.) D (1) 4.8 5.0 0.189 0.197 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F (1) 3.8 4.0 0.15 0.157 L 0.4 1.27 0.016 0.050 M 0.6 0.024 S8 ° (max.) (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). SO8 OUTLINE AND MECHANICAL DATA

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 L6932