Datasheet

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Type Package

TLE 4278 G PG-DSO-14-30 (RoHS compliant)

5-V Low Drop Fixed Voltage Regulator

TLE 4278 G

P-DSO-14-3, -8, -9, -11, 14

PG-DSO-14-30

Data Sheet 1 Rev. 1.4, 2007-02-19

Features

• Output voltage tolerance ≤ ±2%

• Very low current consumption

• Separated reset and watchdog output

• Low-drop voltage

• Watchdog

• Adjustable watchdog activating threshold

• Adjustable reset threshold

• Overtemperature protection

• Reverse polarity protection

• Short-circuit proof

• Suitable for use in automotive electronics

• Wide temperature range

•

AEC qualified

• Green Product (RoHS compliant) version of TLE 4278 G

Functional Description

The TLE 4278 is a monolithic integrated low-drop fixed output voltage regulator

supplying loads up to 200 mA. The IC is available in a PG-DSO-14-30 package. It is

designed to supply microprocessor systems under the severe conditions of automotive

applications and therefore equipped with additional protection functions against over-

load, short circuit and overtemperature. The TLE 4278 can also be used in other

applications where a stabilized voltage is required.

An input voltage

in the range of 5.5 V ≤ V

≤ 45 V is regulated to V

Q,nom

= 5 V with an

accuracy of ±2%.

The device operates in the wide temperature range of

= -40 to 150 °C.

Two additional features are implemented in the TLE 4278 a load dependent watchdog

function as well as a sophisticated reset function including power on reset, under voltage

reset, adjustable reset delay time and adjustable reset switching threshold.

Summary of content (20 pages)

PAGE 1
5-V Low Drop Fixed Voltage Regulator TLE 4278 G Features • • • • • • • • • • • • • • Output voltage tolerance ≤ ±2% Very low current consumption Separated reset and watchdog output Low-drop voltage Watchdog Adjustable watchdog activating threshold Adjustable reset threshold Overtemperature protection Reverse polarity protection Short-circuit proof Suitable for use in automotive electronics Wide temperature range AEC qualified Green Product (RoHS compliant) version of TLE 4278 G PG-DSO-14-30 P-DSO-14-3,
PAGE 2
TLE 4278 G The watchdog function monitors the microcontroller, including time base failures. In case of a missing rising edge within a certain pulse repetition time the watchdog output is set to LOW. Programming of the max. repetition time can be done easily by an external reset delay capacitor. To prevent a reset in case of missing pulses, the watchdog output WO is separate from the reset output RO for the TLE 4278. The watchdog output can be used as an interrupt signal for the microcontroller.
PAGE 3
TLE 4278 G PG-DSO-14-30 WO WADJ GND GND GND D RADJ 1 2 3 4 5 6 7 14 13 12 11 10 9 8 RO VΙ GND GND GND VQ WΙ AEP02113 Figure 1 Pin Configuration (top view) Table 1 Pin Definitions and Functions Pin Symbol Function 1 WO Watchdog Output; the open collector output is connected to the 5 V output via an integrated resistor of 30 kΩ. 2 WADJ Watchdog Adjust; an external resistor to GND determines the watchdog activating threshold.
PAGE 4
TLE 4278 G VΙ 13 9 Temperature Sensor Protection Circuit 14 VQ RO Reset Generator + - Control Amplifier 7 1 Bandgap Reference Watchdog 2 3-5, 10-12 WADJ GND Figure 2 Data Sheet 6 RADJ WO D 8 WΙ AEB02114 Block Diagram 4 Rev. 1.
PAGE 5
TLE 4278 G Table 2 Absolute Maximum Ratings Tj = -40 to 150 °C Parameter Symbol Limit Values Unit Notes Min. Max. VI II -42 45 V – – – mA Internally limited VQ IQ -1 25 V – – – mA Internally limited VRO IRO -0.3 25 V – -5 5 mA – VD ID -0.3 7 V – -2 2 mA – Input Voltage I Voltage Current Output Voltage Q Voltage Current Reset Output RO Voltage Current Reset Delay D Voltage Current Reset Switching Threshold Adjust RADJ Voltage Current VRADJ IRADJ -0.
PAGE 6
TLE 4278 G Table 2 Absolute Maximum Ratings (cont’d) Tj = -40 to 150 °C Parameter Symbol Limit Values Unit Notes Min. Max. -50 150 °C – -50 150 °C – Temperatures Junction temperature Storage temperature Tj Tstg Note: ESD protection according to MIL Std. 883: ±2 kV. Maximum ratings are absolute ratings; exceeding any one of these values may cause irreversible damage to the integrated circuit.
PAGE 7
TLE 4278 G Table 4 Electrical Characteristics VI = 13.5 V; -40 °C ≤ Tj ≤ 125 °C (unless otherwise specified) Parameter Symbol Limit Values Min. Typ. Max. Unit Test Condition Output voltage VQ 4.90 5.00 5.10 V 0 mA ≤ IQ ≤ 150 mA; 6 V ≤ VI ≤ 28 V Output voltage VQ 4.8 5.0 5.
PAGE 8
TLE 4278 G Table 4 Electrical Characteristics (cont’d) VI = 13.5 V; -40 °C ≤ Tj ≤ 125 °C (unless otherwise specified) Parameter Symbol Upper timing threshold VDU Limit Values Unit Test Condition Min. Typ. Max. 1.5 1.9 2.3 V – Lower reset timing threshold VDRL 0.2 0.3 0.4 V – Delay time trd trr 12 20 28 ms 0.4 1.0 2.
PAGE 9
TLE 4278 G ΙΙ C Ι1 1000 µF Ι WO VΙ WO VΙ WΙ VWADJ 9 VQ ΙQ C Ι2 470 nF Ι WADJ WADJ VWO 13 VW VD CQ 10 µF TLE 4278 G 1 2 8 3-5, 10-12 GND 6 D CD 47 nF Ι GND RO 14 7 RADJ Ι RO VQ VRO VRE AES02115 VDR = VΙ -VO Outside the control range Figure 3 Data Sheet Test Circuit 9 Rev. 1.
PAGE 10
TLE 4278 G Application Information Input, Output The input capacitors CI1 and CI2 are necessary for compensating line influences. Using a resistor of approx. 1 Ω in series with CI1, the LC circuit of input inductance and input capacitance can be damped. To stabilize the regulation circuit the output capacitor CQ is necessary. Stability is guaranteed at values CQ ≥ 10 µF with an ESR ≤ 5 Ω within the operating temperature range.
PAGE 11
TLE 4278 G Reset Timing The power-on reset delay time is defined by the charging time of an external capacitor CD which can be calculated as follows: CD = (∆trd × ID,c)/∆V (1) Definitions: CD = delay capacitor ∆trd = delay time ID,c = charge current, typical 5 µA ∆V = VDU, typical 1.
PAGE 12
TLE 4278 G Reset Switching Threshold The present default value is 4.65 V. When using the TLE 4278 the reset threshold can be set to 3.5 V < VQ,rt < 4.6 V by connecting an external voltage divider to pin RADJ. The calculation can be easily done since the reset adjust input current can be neglected. If this feature is not needed, the pin has to be connected to GND. VQ,rt = Vref × (1 + R1/R2) (3) Definitions: • • VQ,rt = Reset threshold Vref = comparator reference voltage, typical 1.
PAGE 13
TLE 4278 G Watchdog Activating The calculation of the external resistor which adjusts the watchdog switch off threshold can be done by Equation (4): RWADJ = VWADJ,th × (IQ/IWADJ)/IQ,act (4) Definitions: • • • VWADJ,th = switch off threshold, typical 1.35 V IQ/IWADJ = current ratio, typical 720 IQ,act = switch off load current TLE 4278 G Ι Q Band-GapReference HIGH + - WADJ Watchdog active LOW Watchdog disabled R WADJ GND AES03072 Figure 7 Data Sheet 13 Rev. 1.
PAGE 14
TLE 4278 G Watchdog Timing The frequency of the watchdog pulses has to be higher than the minimum pulse sequence which is set by the external reset delay capacitor CD. Calculation can be done according to the formulas given in Figure 8. The watchdog output is internally connected to the output Q via a 30 kΩ pull-up resistor. To generate a watchdog created reset signal for the microcontroller the pin WO can be connected to the reset input of the microcontroller.
PAGE 15
TLE 4278 G Table 5 Hints for Unused Pins Symbol Function Connect to RO Reset output open D Reset delay open or to output Q RADJ Reset switching threshold adjust GND WI Watchdog input GND WO Watchdog output open WADJ Watchdog adjust 1) Data Sheet to output Q via a 270 kΩ resistor: Watchdog always active 2) to GND: Watchdog disabled 15 Rev. 1.
PAGE 16
TLE 4278 G Drop Voltage Vdr versus Output Current IQ Current Consumption Iq versus Output Current IQ TL E4 2 7 8 _ IQ -IQ .VSD AED01544 mV I q [mA] V dr 700 V I = 13.5V T j = 25°C 10 600 500 1 400 Tj = 125 C 300 Tj = 25 C 0.1 200 100 0 0 50 100 150 200 250 0.01 0.
PAGE 17
TLE 4278 G Charge Current ID,wc and Discharge Current ID,wd versus Temperature Tj Ι Switching Voltage VDU, VDWL and VDRL versus Temperature Tj AED03111 8 µA VD VΙ = 13.5 V VD = 1.0 V 7 V Ι = 13.5 V 2.4 6 Ι D, wc 5 2.0 4 1.6 3 1.2 2 Ι D, wd 1 0 -40 AED03055 3.2 V 2.8 0 40 80 120 V DU 0.8 V DWL 0.4 V DRL 0 -40 C 0 40 80 Tj Tj Output Voltage VQ versus Temperature Tj VQ Output Current Limit IQ versus Input Voltage VI AED03056 5.2 120 ˚C 160 AED03057 500 IQ V 5.
PAGE 18
TLE 4278 G Package Outlines -0.01 0.2 +0.05 1.27 0.41 +0.1 -0.06 0.2 14 M 0.1 A C 14x C 8˚ MAX. 4 -0.2 1) 1.75 MAX. 0.1 MIN. (1.5) 0.33 ±0.08 x 45˚ 0.64 ±0.25 6 ±0.2 8 1 7 1) 8.75 -0.2 A Index Marking 1) Does not include plastic or metal protrusion of 0.15 max.
PAGE 19
TLE 4278 G TLE 4278 G Revision History: 2007-02-19 Previous Version: 1.3 Rev. 1.4 Page Subjects (major changes since last revision) general Updated Infineon logo #1 Added “AEC” and “Green” logo #1 Added “Green Product” and “AEC qualified” to the feature list #1 Updated Package Names to “PG-DSO-14-30” #18 Added “Green Product” remark You can find all of our packages, sorts of packing and others in our Infineon Internet Page “Products”: http://www.infineon.com/products.
PAGE 20
Edition 2007-02-19 Published by Infineon Technologies AG, 81726 München, Germany © Infineon Technologies AG 2007. All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as a guarantee of characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein.