TDA3664 ,Very low dropout voltage/quiescent current 5 V voltage regulatorINTEGRATED CIRCUITSDATA SHEETTDA3664Very low dropout voltage/quiescentcurrent 5 V voltage regulator ..
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TDA3664-TDA3664A
Very low dropout voltage/quiescent current 5 V voltage regulator
Philips Semiconductors Product specification
Very low dropout voltage/quiescent current
5 V voltage regulator TDA3664
FEATURES
General Fixed 5 V, 100 mA regulator Supply voltage range upto45V Very low quiescent current of 15 μA (typical value) Very low dropout voltage High ripple rejection Very high stability: Electrolytic capacitors: Equivalent Series Resistance
(ESR) <22 Ω at worst-case condition Other capacitors: 100nFat 200μA≤ IREG≤ 100 mA. Pin compatible family TDA3662 up to TDA3666.
Protections Reverse polarity safe (down to −25 V without high
reverse current) Negative transient of 50 V (RS =10 Ω and t< 100 ms) Able to withstand voltages up to 18 V at the output
(supply line may be short-circuited) ESD protection on all pins DC short-circuit safe to ground and VP of the regulator
output Temperature protection (Tj> 150 °C).
GENERAL DESCRIPTIONThe TDA3664isa fixed5V voltage regulator with very low
dropout voltage/quiescent current, which operates over wide supply voltage range.
The regulator is available as: TDA3664: SO4 package (automotive) TDA3664AT: SO8 package (automotive) TDA3664TT: TSSOP8 package (automotive).
Automotive: VP≤45 V and −40°C≤ Tamb≤ +125 °C.
QUICK REFERENCE DATA
Philips Semiconductors Product specification
Very low dropout voltage/quiescent current
5 V voltage regulator TDA3664
ORDERING INFORMATION
BLOCK DIAGRAM
Philips Semiconductors Product specification
Very low dropout voltage/quiescent current
5 V voltage regulator TDA3664
PINNING
FUNCTIONAL DESCRIPTIONThe TDA3664 is a fixed 5 V regulator which can deliver
output currentsupto 100 mA. The regulatoris availablein
SO8, TSSOP8 and SO4 packages. The regulator is
intended for portable, mains, telephone and automotive
applications. To increase the lifetime of batteries, specially built-in clamp circuit keeps the quiescent
current of this regulator very low, also in dropout and full
load conditions.
The regulator remains operational downto very low supply
voltages, below which it switches off.
A temperature protection is included, which switches the
regulator output off at IC temperatures above 150 °C.
A new output structure guarantees the stability of the
regulator with an ESR (worst-case) up to 22Ω,
see Figs5 and 6. This is very attractive as the ESR of an
electrolytic capacitor increases strongly at low
temperatures (no expensive tantalum capacitor required).
Philips Semiconductors Product specification
Very low dropout voltage/quiescent current
5 V voltage regulator TDA3664
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 60134).
THERMAL CHARACTERISTICS
QUALITY SPECIFICATIONIn accordance with “SNW-FQ-611E”.
Philips Semiconductors Product specification
Very low dropout voltage/quiescent current
5 V voltage regulator TDA3664
CHARACTERISTICS= 14.4 V; Tamb =25 °C; measured in test circuit (see Fig.4); unless otherwise specified.
Notes The regulator output will follow VPifVP
Philips Semiconductors Product specification
Very low dropout voltage/quiescent current
5 V voltage regulator TDA3664
TEST AND APPLICATION INFORMATION
Noise
The output noiseis determinedby the valueof the output
capacitor (see Table1).
Table 1 Noise figures
Note Measured at a bandwidth of 10 Hzto 100 kHz.
Stability
Theregulatoris stabilized withan external capacitoron the
output. The value of this capacitor can be selected using
the diagrams shownin Figs5 and 6.The four exampleson
the next page show the effects of the stabilization circuit
using different values for the output capacitor.
Philips Semiconductors Product specification
Very low dropout voltage/quiescent current
5 V voltage regulator TDA3664
EXAMPLE1
The regulator is stabilized with an electrolytic output
capacitorof68μF (ESR= 0.5 Ω).At −40 °C, the capacitor
value is decreased to 22 μF and the ESR is increased to
3.5Ω. The regulator will remain stableata temperatureof
−40 °C.
EXAMPLE2
The regulator is stabilized with an electrolytic output
capacitorof10μF (ESR= 3.3 Ω).At −40 °C, the capacitor
value is decreased to 3 μF and the ESR is increased toΩ. The regulator will remain stableata temperatureof
−40 °C.
EXAMPLE3
The regulatoris stabilized witha 100nF MKT capacitoron
the output. Full stability is guaranteed when the output
current is over 200 μA.
Because the thermal influence on this capacitor value is
almost zero, the regulator will remain stable at temperature of −40 °C.
EXAMPLE4
The regulator is stabilized with a 100 nF capacitor in
parallel witha electrolytic capacitorof10μFon the output.
The regulator is now stable under all conditions and
independent of: The ESR of the electrolytic capacitor The value of the electrolytic capacitor The output current.
Application circuits
The maximum output current of the regulator equals:
When Tamb =21 °C, the maximum output current equals
140 mA at VP =14V.
The total thermal resistance of the TDA3664 (SOT223-1
package) can be decreased to lower values when pin4
and bodyof the package are solderedto the printed-circuit
board.
Application circuit with backup function
Sometimes, a backup function is needed to supply, for
example,a microcontrollerfora short periodof time when
the supply voltage spikes to 0 V (or even−1 V).
This function canbe easily builtwith the TDA3664by using
a large output capacitor. When the supply voltage is 0V
(or−1 V), only a small current will flow into pin REG from
this large output capacitor (a few μA).
The application circuit is given in Fig.7. REG max()
150 Tamb–
Rth(j-a) VP VREG– ()× -------------------------------------------------------=
150 T amb–
100 VP5–()× -------------------------------------= (mA)
Philips Semiconductors Product specification
Very low dropout voltage/quiescent current
5 V voltage regulator TDA3664
Additional application information
This section gives typical curves for various parameters measured on the TDA3664AT. Standard test conditions are:= 14.4 V; Tamb =25 °C.
Philips Semiconductors Product specification
Very low dropout voltage/quiescent current
5 V voltage regulator TDA3664
