Siemens TLE4261-2GL, TLE4261-2G, TLE4261-2 Datasheet
5-V Low-Drop Voltage Regulator TLE 4261-2
Features
• High accuracy 5 V ± 2%
• Very low-drop voltage
• Very low quiescent current
• Low starting-current consumption
• Proof against reverse polarity
• Input voltage up to 42 V
• Overvoltage protection up to 65 V (
≤ 400 ms)
• Short-circuit-proof
• External setting of reset delay
• Integrated watchdog circuit
• Wide temperature range
• Overtemperature protection
• Suitable for automotive use
• EMC proofed (100 V/m)
Type Ordering Code Package
▼ TLE 4261-2 Q67000-A9110 P-TO220-7-1
P-TO220-7-1
P-DSO-20-6
TLE 4261-2 G Q67000-A9140 P-DSO-20-6
▼
(SMD)
TLE 4261-2 GL Q67006-A9193 P-TO220-7-8
▼
(SMD)
▼ Please also refer to the new pin compatible device
TLE 4271
P-TO220-7-8
Functional Description
TLE 4261-2 is a high accuracy 5-V low-drop voltage regulator in a P-TO220-7 or in a PDSO package. The maximum input voltage is 42 V (65 V/≤ 400 ms). The device can
produce an output current of more than 500 mA. It is short-circuit-proof and incorporates
temperature protection that disables the circuit at impermissibly high temperatures.
Semiconductor Group 1 1998-11-01
TLE 4261-2
Application Description
V
The IC regulates an input voltage
reset signal is genera ted for an outpu t voltage
in the range 6V<V
I
V
of < 4.75 V. The reset delay c an be
O
set with an external capacitor. A connected microprocessor is monitored by the
integrated watchdog circui t; if pulses are missing, the reset ou tpu t is set low. The pulse
repetition rate can be set within wide limits with the capacitor for reset delay. If this input
is connected to a voltage of > 6 V, the watchdog function is deactivated. The device also
features an inhibit input, which is activated by a voltage of > 6 V
input through internal hysteresis up to approx. 3 V. A voltage of < 2 V on the inhibit input
turns off the regulator, current drain then dropping to max. 50
Design Notes for External Components
C
The input capacitor
causes a low-resistant p owerline and limi ts the rise t imes of the
I
input voltage. The IC is protected against rise times up to 100 V/
the tuned circuit consisting of supply inductance and input capacitance with a resistor of
approx. 1
Ω in series to C
.
I
The output capacitor maintains the stability of the regulating loop. Stability is guaranteed
with a rating of 22
µF min. at an ESR of 3 Ω max. in the operating temperature range.
<40V to V
I
Qrated
=5.0V. A
and then works on this
µA.
µs. It is possible to damp
Circuit Description
The control amplifier compares a reference voltage, which is kept highly accurate by
resistance adjustment, to a voltage that is proportional to the output voltage and controls
the base of the series PNP transistor via a buffer. Saturation control as a function of the
load current prevents any over-saturation of the power element. If the output voltage
drops below 95.5% of its typical value for more than 2
µs, a reset signal is triggered on
pin 3 and an e xternal capacitor discharged on pin 5. The reset signal is not cancelled
V
until the voltage on the ca pacitor has exceeded the upper switching thres hold
DT
. A
positive-edge-triggered watchdog circuit monitors the connected microprocessor and
will likewise trigger a reset if puls es are missing . The IC can be disa bled by a low le vel
on the inhibit input and the current consumption drops to
< 50 µA.
The IC also incorporates a number of circuits for protection against:
• Overload
• Overvoltage
• Overtemperature
• Reverse polarity
Semiconductor Group 2 1998-11-01
Pin Configuration
(top view)
TLE 4261-2 TLE 4261-2 GL
TLE 4261-2
4321567
INH
GND
Watch
V
QRES
Ι
DRES
V
Q
AEP00592
Pin Definitions and Functions
Pin No. Symbol Function
1
V
I
Input voltage; block a capacitor directly to ground on the IC. The
capacitor rating will depend on the vihicle electric system.
Oscillation of the output voltage can be damped by a resistor of
approx. 1 Ω in series with the input capacitor.
2INHInhibit; switches off the IC when low.
3QRESReset output; open collector output controlled by the reset delay.
4GNDGround
5 DRES Reset delay; wired to ground using a capacitor.
6WatchWatchdog; monitors the microprocessor when active.
7
V
Q
5-V output; block to ground using a capacitor of ≥ 22-µF. ESR is
≤ 3 Ω in the operating temperature range.
Semiconductor Group 3 1998-11-01
TLE 4261-2 G
TLE 4261-2
Pin No. Symbol Function
18
V
I
Input voltage; block a capacitor directly to ground on the IC. The
capacitor rating will depend on the vihicle electric system.
Oscillation of the output voltage can be damped by a resistor of
approx. 1 Ω in series with the input capacitor.
N.C.
N.C.
QRES
GND
GND 5
GND
N.C.
DRES
N.C.
1
2
3
4
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
AEP01182
INH
N.C.
V
Ι
GND
GND
GNDGND
GND
N.C.
V
Q
Watch
20 INH Inhibit; switches off the IC when low.
3QRESReset output; open collector output controlled by the reset delay.
4 -7,
GND Ground
14 - 17
9DRESReset delay; wired to ground using a capacitor.
11 Watch Watchdog; monitors the microprocessor when active.
12
V
Q
5-V output; block to ground using a capacitor of ≥ 22-µF. ESR is
≤ 3 Ω in the operating temperature range.
1, 2, 8,
N.C. Not connected
10, 13,
19
Semiconductor Group 4 1998-11-01
TLE 4261-2
Input
1
(18)
Overvoltage
Monitoring
Adjustment
Temperature
Sensor
Saturation
Control and
Protection
Control
Amplifier
BANDGAP
Reference
Inhibit
Buffer
+
-
RESET
Generator
Watchdog
(4-7)
2(20)
(11) 64(14-17)
Inhibit GND Watchdog
7
(12)
5
(9)
3
(3)
AEB00002
Output
RESET
Delay
RESET
Output
Block Diagram
Semiconductor Group 5 1998-11-01
TLE 4261-2
Absolute Maximum Ratings
T
= – 40 to 150 °C
J
Parameter Symbol Limit Values Unit Remarks
min. max.
Input
Input voltage
Input current
Inhibit
Voltage
Current
Reset Output
Voltage
Current
Ground
Current
V
V
I
I
V
I
2
V
I
R
I
GND
I
I
– 42 42 V –
–65 Vt ≤ 400 ms
–1.6 A–
2
– 0.3 42 V –
–5 mA–
R
– 0.3 42 V –
– – – internally limited
–0.5 A–
Reset Delay
Voltage
Current
V
I
D
D
– 0.3 42 V –
– – – internally limited
Output
Differential voltage
Current
Semiconductor Group 6 1998-11-01
V
I
Q
I
– V
–5.25 V
Q
I
–1.4 A–
V–
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