Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsVoltage RegulatorsL6932D1.2TR

1/11

L6932

December 2005

■ 2V TO 14V INPUT VOLTAGE RANGE

■ 200mΩ Rdson MAX.

■ 200µA QUIESCENT CURRENT AT ANY LOAD

■ EXCELLENT LOAD AND LINE REGULATION

■ 1.5V, 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

operates from 2V to 14V and is able to support 2A.

Designed with an internal 50mΩ N-channel

Mosfet, can be usefull for the DC-DC conversion

between 2.5V and 1.5V at 2A in portable applica-

tions reducing the power dissipation.

L6932 is available in 1.5V, 1.8V, 2.5V and adj ver-

sion from 1.2V and ensure a voltage regulation ac-

curacy of 1%.

The current limit is fixed at 2.5A to control the cur-

rent in short circuit condition within ±8%. The cur-

rent 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)

L6932D1.5 (SO-8) L6932D1.5TR (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

L6932D

PGOOD

GND

2V to 14V

OUT

1.5V-1.8V-2.5V

5,6,7,8

L6932D

ADJ

GND

2V to 14V

OUT

1.2V to 5V

5,6,7,8

OUT

Rev. 9

Summary of content (11 pages)

PAGE 1
L6932 HIGH PERFORMANCE 2A ULDO LINEAR REGULATOR ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 2V TO 14V INPUT VOLTAGE RANGE 200mΩ Rdson MAX. 200µA QUIESCENT CURRENT AT ANY LOAD EXCELLENT LOAD AND LINE REGULATION 1.5V, 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 SO-8 (4+4) ORDERING NUMBERS: L6932D1.2 (SO-8) L6932D1.2TR (T&R) L6932D1.5 (SO-8) L6932D1.5TR (T&R) L6932D1.8 (SO-8) L6932D1.
PAGE 2
L6932 PIN CONNECTIONS EN 1 8 GND EN 1 8 GND IN 2 7 GND IN 2 7 GND ADJ 3 6 GND OUT 3 6 GND OUT 4 5 GND PGOOD 4 5 GND L6932D1.2 L6932D1.5 L6932D1.8 L6932D2.5 PIN FUNCTION N° L6232D 1.5/1.8/ 2.5 L6232D 1.2 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.
PAGE 3
L6932 BLOCK DIAGRAM (Referred to the Fixed Voltage version) IN CHARGE PUMP VREF REFERENCE VREF=1.25V EN ENABLE CURRENT LIMIT DRIVER + ERROR AMPL. OUT THERMAL SENSOR PG 0.9 VREF + GND D99IN1100 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. Max. Unit 14 V 1.2 1.212 V 1.485 1.5 1.515 V 1.782 1.8 1.818 V 2.475 2.5 2.525 V 5 mV Vin = 3.
PAGE 4
L6932 ELECTRICAL CHARACTERISTCS (continued) Symbol Parameter Iocc Test Condition Current limiting Iq Quiescent current Ish Shutdown current 2V < Vin < 14V Ripple Rejection f = 120Hz, Io = 1A Vin = 5V, ∆Vin = 2Vpp Ven Typ. Max. Unit 2.3 2.5 2.7 A 0.2 0.4 mA 25 µA * EN Input Threshold Pgood threshold Min. 60 75 0.5 0.65 Vo rise Pgood Hysteresis Ipgood =1mA Pgood saturation Figure 1. Output Voltage vs. Junction Temperature (L6932D1.2) dB 0.8 V 90 %Vo 10 %Vo 0.2 0.
PAGE 5
L6932 Figure 5. Shutdown Current vs. Junction TemperatureAPPLICATION INFORMATIONS 7.5 7 6.5 Ishdn Vin=5V 6 (uA) 5.5 5 4.5 4 -40 -20 0 20 40 60 80 100 120 140 Temp [°C ] APPLICATION CIRCUIT In figure 6 the schematic circuit of the demoboards are shown. Figure 6. Demoboards Schematic Circuit VIN VOUT OUT IN 2 EN 3 L6932D1.5 L6932D1.8 L6932D2.5 1 C1 6 5 7 4 PGOOD C2 8 GND VIN IN 4 2 VOUT OUT 1.2V to 5V EN R1 L6932D1.2 1 C1 3 6 5 7 ADJ C2 VOUT = 8 R2 GND 1.
PAGE 6
L6932 Figure 7. Demoboard Layout (Fixed Version) Adjustable version Reference Part Number Description Manufacturer C1 C34Y5U1E106Z 10uF, 25V TOKIN C2 C34Y5U1E106Z 10uF, 25V TOKIN R1 5.6K, 1%, 0.25W Neohm R2 3.3K, 1%, 0.25W 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.
PAGE 7
L6932 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.
PAGE 8
L6932 The thermal resistance junction to ambient of the demoboard is approximately 62°C/W. This mean that, considering an ambient temperature of 60°C and a maximum junction temperature of 150°C, 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.
PAGE 9
L6932 Figure 11. SO-8 Mechanical Data & Package Dimensions mm inch DIM. MIN. TYP. MAX. MIN. TYP. MAX. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.004 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D (1) 4.80 5.00 0.189 0.197 E 3.80 4.00 0.15 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd OUTLINE AND MECHANICAL DATA 0˚ (min.), 8˚ (max.) 0.10 0.
PAGE 10
L6932 Table 1. Revision History Date Revision February 2003 8 First Issue December 2005 9 Added new Ordering Numbers: L6932D1.5 & L6932D1.5TR.
PAGE 11
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.