Document
TLE4287G
5-V Voltage Regulator
Data Sheet
Rev. 1.41, 2012-01-30
Automotive Power
5-V Voltage Regulator
TLE4287G
Features
• Output voltage tolerance ≤ ±2% • Very low standby current consumption • Input voltage up to 42 V • Reset function down to 1 V output voltage • Adjustable reset time • On/Off logic • Overtemperature protection • Reverse polarity protection • Short-circuit proof • Very wide temperature range • Very small output capacitor • Green Product (RoHS compliant) • AEC Qualified
Functional Description
The TLE4287G is a monolithic integrated 5 V voltage regulator in PG-DSO-14 package. It supplies an output current IQ > 250 mA. The IC is short circuit proof and incorporates temperature protection which turns off the device at overtemperature.
The input voltage VI is regulated in the range of 7.5 V < VI < 40 V to VQ,nom = 5 V. Therefore a reference voltage, which is kept highly accurate by resistance adjustment, is compared via a control amplifier to a voltage that is proportional to the output voltage. The control amplifier drives the base of the series transistor by a buffer.
A comparator in the reset-generator block compares a reference voltage that is independent of the input voltage to the scaled-down output voltage. In the case of an output voltage VQ < 4.5 V the reset delay capacitor is discharged and a reset signal is generated by setting the reset output LOW. The reset delay time can be set by choosing the external capacitor over a wide range. When the output voltage rises above VQ ≥ 4.5 V the reset delay capacitor is charged again. As soon as the delay capacitor voltage reaches the upper switching threshold the reset output pin is set HIGH again.
Type TLE4287G
Data Sheet
Package PG-DSO-14
2
Rev. 1.41, 2012-01-30
TLE4287G
The device has two logic inputs, EN and H. It is turned ON by a voltage > 4 V at EN, for example by the ignition and remains active in case H is set LOW, even if the voltage at EN goes LOW. This makes it possible to implement a self-holding circuit without external components. When the device is turned OFF, the output voltage drops to 0 V and current consumption tends towards 0 μA (see Table 1).
Design Notes for External Components
The input capacitor CI is necessary for compensation line influences. The resonant circuit consisting of lead inductance and input capacitance can be damped by a resistor of approx. 1 Ω in series with CI. The output capacitor is necessary for the stability of the regulating circuit. Stability is guaranteed for CQ ≥ 100 nF within the operating temperature range.
Table 1 Enable EN L H
H
X
L
L
State Table for Turn-On/Turn-Off Logic
Hold H X
VQ Remarks 0 V Initial state
X 5 V Regulator switched on via pin 6, by ignition for example
L 5 V Pin 9 clamped active to GND by controller while pin 6 is still HIGH
L 5 V Previous state remains, even ignition is shut off: self-holding state
L 5 V Ignition shut off while regulator is in self-holding state
H 0 V Regulator shut down by releasing of pin 9 while pin 6 remains LOW, final state. No active clamping required by external self-holding circuit (μC) to keep regulator shut off
Data Sheet
3 Rev. 1.41, 2012-01-30
TLE4287G
I N.C. GND GND GND
EN RO
1 14 GND 2 13 Q 3 12 GND 4 11 GND 5 10 GND 6 9H 7 8D
AEP02240
Figure 1 Pin Configuration (top view)
Table 2 Pin No. 1
2 3, 4, 5, 10, 11, 12, 14 6
7
8
9
13
Pin Definitions and Functions
Symbol Function
I Input; block to ground directly at the IC by a ceramic capacitor
N.C.
Not connected
GND
Ground
EN Enable; active high, device is turned ON by HIGH signal at this pin, internally connected to GND via pull-down resistor of 100 kΩ
RO Reset Output; open-collector output, internally connected to Q via a pull-up resistor of 30 kΩ
D Reset Delay; connect to GND via external delay capacitor for setting delay time
H Hold and release; active low, see Table 1 for function, connected to Q via a pull-up resistor of 50 kΩ
Q Output; block to GND with a capacitor CQ ≥ 100 nF
Data Sheet
4 Rev. 1.41, 2012-01-30
TLE4287G
Input 1 Adjustment
Temperature Sensor
Saturation Control and Protection Circuit
Bandgap Reference
Control Amplifier
Buffer
13 5V Output
Reset Generator
7 Reset Output
8 Reset Delay
Turn-ON /
Turn-OFF Logic
6 Enable
9 Hold
3,4,5,10,11,12,14 GND
AEB02241
Figure 2 Block Diagram
Data Sheet
5 Rev. 1.41, 2012-01-30
TLE4287G
Table 3
Absolute Maximum Ratings
Parameter
Symbol Limit Values Unit Remarks
Min. Max.
Input I
Voltage Current Output Q
VI
-0.5 42
V
–
II – – mA internally limited
Voltage Current Reset Output RO
VQ -0.3 7 V – IQ – – – internally limited
Voltage Current Reset Delay D
VR -0.3 7 V – IR – – – internally limited
Voltage Current Enable EN
VD
-0.3 42
V
–
ID – – – –
Voltage Current Hold H
VEN
-42 42
V
–
IEN -5 5 mA t ≤ 400 ms
Voltage Current Ground GND
VH -2 7 V – IH – – – internally limited
Current Temperatures
IGND
-0.5 –
A–
Junction temperature
Tj -40 150 °C
Storage temperatu.