Very low dropout voltage/quiescent
current adjustable voltage regulator
Product specification
Supersedes data of 2000 Dec 08
File under Integrated Circuits, IC01
2000 Dec 13
Page 2
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
TDA3661
adjustable voltage regulator
FEATURES
• Output adjustable from 1.5 V to VP, 100 mA regulator
• Supply voltage range up to 45 V
• 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: 100 nFat 200 µA ≤ I
REG
≤ 100 mA.
• Pin compatible family TDA3662 to TDA3666
• Protections:
QUICK REFERENCE DATA
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX.UNIT
– Reverse polarity safe (down to −25 V without high
reverse current)
– Negative transient of 50 V (RS=10Ω, 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 (at Tj> 150 °C).
GENERAL DESCRIPTION
The TDA3661 is an adjustable voltage regulator with very
lowdropout voltage andquiescentcurrent, which operates
over a wide supply voltage range.
Supply
V
P
I
q
supply voltageregulator on314.445V
quiescent supply currentVP= 14.4 V; I
=0mA−1530µA
REG
Regulator; k = 4.01929 (note 1)
V
REG
V
ref
V
REG(drop)
output voltage8 V ≤ VP≤ 22 V; I
6V≤V
V
P
0.5 mA ≤ I
≤45 V; I
P
= 14.4 V;
REG
≤ 100 mA
reference voltageVP= 14.4 V1.1811.2441.306V
dropout voltageVP= 4.5 V; I
T
amb
REG
≤ 85 °C
= 0.5 mA4.85.05.2V
REG
= 0.5 mA4.755.05.25V
REG
4.755.05.25V
= 50 mA;
−0.180.3V
Note
1.
V
REG
V
k×=
ref
ORDERING INFORMATION
TYPE
NUMBER
NAMEDESCRIPTIONVERSION
PACKAGE
TDA3661ATSO8plastic small outline package; 8 leads; body width 3.9 mmSOT96-1
2000 Dec 132
Page 3
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
adjustable voltage regulator
BLOCK DIAGRAM
handbook, halfpage
8
V
P
REGULATOR
BAND GAP
TDA3661
PROTECTION
2, 3, 6, 7
GND
THERMAL
MGS579
TDA3661
1
REG
5
ADJ
Fig.1 Block diagram.
PINNING
SYMBOLPINDESCRIPTION
REG1regulator output
GND2, 3, 6 and 7 ground; note 1
n.c.4not connected
ADJ5feedback input
V
P
8supply voltage
Note
1. All GND pins are connected to thelead frameand can
also be used to reduce the total thermal resistance
by soldering these pins to a ground plane.
R
th(j-a)
The ground plane on the top side of the PCB acts like
a heat spreader.
handbook, halfpage
REG
1
2
TDA3661
3
GND
4
n.c.
MGS580
Fig.2 Pin configuration.
V
8
P
GNDGND
7
GND
6
ADJ
5
2000 Dec 133
Page 4
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
TDA3661
adjustable voltage regulator
FUNCTIONAL DESCRIPTION
The TDA3661 is an adjustable voltage regulator with an
output voltage that can be fixed by means of an external
resistor divider. The regulator can deliver output currents
up to 100 mA. The regulator is available in an SO8
package. The regulator is intended for portable, mains,
telephone and automotive applications. To increase the
lifetime of batteries, aspecially built-in clamp circuit keeps
the quiescent current of this regulator very low, in dropout
and full load conditions.
The device remains operational down to very low supply
voltages (typical 2 V) and belowthis voltageit switchesoff.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134).
SYMBOLPARAMETERCONDITIONSMIN.MAX.UNIT
V
V
P
T
T
T
P
P(rp)
tot
stg
amb
j
supply voltage−45V
reverse polarity supply voltagenon-operating−−25V
total power dissipationtemperature of copper area
Atemperatureprotection is includedwhich switchesoff the
regulator output at a junction temperature above 150 °C.
A new output circuit guarantees the stability of the
regulator for a capacitor output circuit with an ESR
(worst-case) up to22 Ω, seeFigs 4 and 5. If only a 100 nF
capacitor is used, the regulator is fully stable when
I
> 200 µA. This is very attractive as the ESR of an
REG
electrolytic capacitor increases strongly at low
temperatures (no expensive tantalum capacitor is
required).
−4.1W
is 25 °C
THERMAL CHARACTERISTICS
SYMBOL PARAMETERCONDITIONSVALUE UNIT
R
R
th(j-c)
th(j-a)
thermal resistance from junction to caseto centre pins; soldered30K/W
thermal resistance from junction to ambientin free air; soldered125K/W
QUALITY SPECIFICATION
In accordance with
“SNW-FQ-611E”
.
2000 Dec 134
Page 5
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
TDA3661
adjustable voltage regulator
CHARACTERISTICS
VP= 14.4 V; T
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX.UNIT
Supply voltage: pin V
V
P
I
q
Regulator output: pin REG
V
REG
V
REG(drop)
V
REG(stab)
V
REG(adj)
∆V
REG(line)
∆V
REG(load)
SVRRsupply voltage ripple rejectionf
V
ref
I
REG(crl)
I
LO(rp)
=25°C; k = 4.01929 (note 1); measured with test circuit of Fig.3; unless otherwise specified.
output voltage long-term stability−20−mV/1000 h
output voltage adjust range1.5−V
line input regulation voltage7 V ≤ VP≤ 22 V; I
7V≤V
load output regulation voltage0.5 mA ≤ I
= 120 Hz;
i
V
i(ripple)
I
REG
≤45 V; I
P
REG
= 1 V (RMS);
= 0.5 mA
≤ 50 mA−1050mV
= 0.5 mA−130mV
REG
= 0.5 mA−150mV
REG
5060−dB
V
P
reference voltageVP= 14.4 V1.181 1.244 1.306 V
output current limitV
output leakage currentat reverse
> 4 V0.170.3−A
REG
VP= −15 V; V
= ≤ 0.3 V−1500µA
REG
polarity
Notes
1. The output voltage can be calculated using the following formula: where and
V
REG
V
ref
k×=k
R1 R2+
=
---------------------R2
R1 + R2 ≤ 100 kΩ.
2. The regulator output will follow V
if VP<V
P
REG+VREG(drop)
.
2000 Dec 135
Page 6
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
adjustable voltage regulator
TEST AND APPLICATION INFORMATION
andbook, halfpage
V
P
(1)
C1
1 µF
(1) C1 is optional (to minimize supply noise only).
81
5
MGS581
R1
75.1 kΩ
R2
24.9 kΩ
TDA3661
2, 3, 6, 7
Fig.3 Test circuit.
C2
10 µF
V
REG
= 5 V
TDA3661
2
10
handbook, halfpage
ESR
(Ω)
10
1
−1
10
−1
10
(1) Maximum ESR at 200 µA ≤ I
(2) Minimum ESR only when I
(1)
stable region
(2)
11010
≤ 100 mA.
REG
≤ 200 µA.
REG
Fig.4Graph for selecting the value of the output
capacitor.
MDA961
C2 (µF)
2
Noise
The output noise is determined by the value of the output
capacitor. The noise figure is measured at a bandwidth of
10 Hz to 100 kHz (see Table 1).
Table 1 Noise figures
OUTPUT
NOISE FIGURE (µV)
CURRENT
I
REG
(mA)
C2 = 10 µFC2=47µFC2 = 100 µF
0.5550320300
50650400400
Stability
The regulator is stabilized with an external capacitor
connectedto theoutput. The valueof this capacitorcan be
selected using the diagrams shown in Figs 4 and 5.
The following three examples show the effects of the
stabilization circuit using different values for the output
capacitor.
3
10
handbook, halfpage
ESR
(Ω)
2
10
22
10
1
−1
10
11010
stable region
Fig.5ESR as a function of I
value of the output capacitor.
MDA962
2
10
I
(mA)
REG
for selecting the
REG
3
2000 Dec 136
Page 7
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
adjustable voltage regulator
EXAMPLE 1
The regulator is stabilized with an electrolytic capacitor of
68 µF (ESR = 0.5 Ω). At T
value is decreased to 22 µF and the ESR is increased
to 3.5 Ω. The regulator will remain stable at a temperature
of T
amb
= −40 °C.
EXAMPLE 2
The regulator is stabilized with a 100 nF MKT capacitor
connected to the output. When the output current is larger
then 200 µA full stability is guaranteed. Because the
thermalinfluence on the capacitorvalueis almost zero, the
regulator will remain stable at a temperature of
T
= −40 °C.
amb
EXAMPLE 3
The regulator is stabilized with a 100 nF capacitor in
parallelwith an electrolytic capacitorof10 µF connected to
the output.
= −40 °C, the capacitor
amb
TDA3661
For successful operation of the IC (maximum output
current capability) special attention has to be given to the
copper area required as heatsink (connected to all
GND pins), the thermal capacity of the heatsink and its
ability to transfer heat to the external environment. It is
possible to reduce the total thermal resistance from
120 to 50 K/W.
APPLICATION CIRCUIT WITH BACKUP FUNCTION
Sometimes, a backup function is needed to supply, for
example, a microcontroller for a short period of time when
the supply voltage spikes to 0 V (or even −1 V).
Thisfunction can easily bebuiltwith the TDA3661byusing
an output capacitor with a large value. When the supply
voltage is 0 V (or −1 V), only a small current will flow into
pin REG from this output capacitor (a few µA).
The application circuit is given in Fig.6.
The regulator is now stable under all conditions and
independant 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:
Very low dropout voltage/quiescent current
adjustable voltage regulator
APPLICATION CIRCUIT WITH ENABLE FUNCTION
Anenable function caneasilybe built withthe TDA3661 by
connecting a diode to pin ADJ. When the voltage on
pin ADJ is forced above 1.3 V, the output will switch off.
Thestandby current is equaltothe quiescent currentofthe
TDA3661.
The application circuit is given in Fig.7.
ndbook, halfpage
V
P
(1)
C1
1 µF
(1) C1 is optional (to minimize supply noiseonly).
81
TDA3661
5
2, 3, 6, 7
MGS583
R1
75.1 kΩ
R2
24.9 kΩ
Fig.7 Application circuit with enable function.
TDA3661
V
= 5 V
C2
10 µF
enable
D1
REG
Additional application information
This section gives typical curves for various parameters measured on the TDA3661AT. Standard test conditions are:
VP= 14.4 V, T
25
handbook, halfpage
I
q
(µA)
20
15
10
5
0
010
=25°C and k = 4.01929.
amb
MDA947
2030
V
(V)
P
handbook, halfpage
4
I
q
(mA)
3
2
1
0
01050
2030
40
MDA949
VP (V)
I
= 0 mA.
REG
Fig.8Quiescent current as a function of the
supply voltage.
2000 Dec 138
Fig.9Quiescent current increase as a function of
high supply voltage.
Page 9
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
adjustable voltage regulator
120
MDA951
160
Tj (°C)
handbook, halfpage
2
I
q
(mA)
1.5
1
0.5
0
−400
(1) Iq at 50 mA load.
(2) Iq at 10 mA load.
(1)
(2)
4080
0.48
handbook, halfpage
I
q
(mA)
0.44
0.40
0.36
5
I
= 10 mA.
REG
1015
TDA3661
MDA948
2520
VP (V)
Fig.10 Quiescent current as a function of the
junction temperature.
I
q
(mA)
1.8
1.6
1.4
2
5
1015
handbook, halfpage
MDA950
VP (V)
Fig.11 Quiescent current as a function of the
supply voltage.
80
I
REG
MDA952
(mA)
handbook, halfpage
2520
4
I
q
(mA)
3
2
1
0
020100
4060
I
= 50 mA.
REG
Fig.12 Quiescent current as a function of the
supply voltage.
2000 Dec 139
Fig.13 Quiescent current as a function of the
output current.
Page 10
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
adjustable voltage regulator
5.10
handbook, halfpage
V
REG
(V)
5.05
5.00
4.95
−50200
050
100150
MDA953
T
(°C)
j
handbook, halfpage
6
V
REG
(V)
4
2
0
−50200
050
100150
TDA3661
MDA955
T
(°C)
j
I
= 0 mA.
REG
Fig.14 Output voltage as a function of the junction
temperature.
500
handbook, halfpage
V
REG(drop)
(mV)
400
300
200
100
040
80120
MDA957
I
(mA)
REG
I
= 0 mA.
REG
Fig.15 Output voltage thermal protection as a
function of the junction temperature.
V
REG
(V)
6
4
2
0
0
100
200300
I
(mA)
REG
handbook, halfpage
MDA954
Fig.16 Dropout voltage as a function of the output
current.
2000 Dec 1310
VP= 8 V and pulsed load.
Fig.17 Fold back protection mode.
Page 11
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
adjustable voltage regulator
−30
handbook, halfpage
SVRR
(dB)
−40
−50
(1)
−60
(2)
(3)
−70
10
I
= 10 mA; C2 = 10 µF.
REG
(1) SVRR at RL= 100 Ω.
(2) SVRR at RL= 500 Ω.
(3) SVRR at RL=10kΩ.
2
10
3
10
MDA956
(1)
(2)
(3)
4
10
f (Hz)
5
10
TDA3661
Fig.18 SVRR as a function of the ripple frequency.
2000 Dec 1311
Page 12
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
adjustable voltage regulator
PACKAGE OUTLINE
SO8: plastic small outline package; 8 leads; body width 3.9 mm
D
c
y
Z
8
5
TDA3661
SOT96-1
E
H
E
A
X
v M
A
A
pin 1 index
1
e
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
mm
A
max.
1.75
0.069
A1A2A
0.25
1.45
0.10
1.25
0.010
0.057
0.004
0.049
0.25
0.01
b
3
p
0.49
0.25
0.36
0.19
0.019
0.0100
0.014
0.0075
UNIT
inches
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
4
w M
b
p
02.55 mm
scale
(1)E(2)
cD
5.0
4.8
0.20
0.19
eHELLpQZywv θ
4.0
1.27
3.8
0.16
0.050
0.15
2
A
6.2
5.8
0.244
0.228
Q
3
A
θ
0.250.10.25
0.010.010.0410.004
(1)
0.7
0.3
0.028
0.012
o
8
o
0
L
p
L
0.7
0.6
0.028
0.024
(A )
1
detail X
1.0
1.05
0.4
0.039
0.016
OUTLINE
VERSION
SOT96-1
IEC JEDEC EIAJ
076E03 MS-012
REFERENCES
2000 Dec 1312
EUROPEAN
PROJECTION
ISSUE DATE
97-05-22
99-12-27
Page 13
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
adjustable voltage regulator
SOLDERING
Introduction to soldering surface mount packages
Thistext gives a verybriefinsight to acomplextechnology.
A more in-depth account of soldering ICs can be found in
our
“Data Handbook IC26; Integrated Circuit Packages”
(document order number 9398 652 90011).
There is no soldering method that is ideal for all surface
mount IC packages. Wave soldering can still be used for
certainsurface mount ICs, butitis not suitable forfinepitch
SMDs. In these situations reflow soldering is
recommended.
Reflow soldering
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
tothe printed-circuit boardby screen printing,stencillingor
pressure-syringe dispensing before package placement.
Several methods exist for reflowing; for example,
convection or convection/infrared heating in a conveyor
type oven. Throughput times (preheating, soldering and
cooling) vary between 100 and 200 seconds depending
on heating method.
Typical reflow peak temperatures range from
215 to 250 °C. The top-surface temperature of the
packages should preferable be kept below 220 °C for
thick/large packages, and below 235 °C for small/thin
packages.
Wave soldering
Conventional single wave soldering is not recommended
forsurface mount devices (SMDs)orprinted-circuit boards
with a high component density, as solder bridging and
non-wetting can present major problems.
To overcome these problems the double-wave soldering
method was specifically developed.
TDA3661
If wave soldering is used the following conditions must be
observed for optimal results:
• Use a double-wave soldering method comprising a
turbulent wave with high upward pressure followed by a
smooth laminar wave.
• For packages with leads on two sides and a pitch (e):
– larger than or equal to 1.27 mm, the footprint
longitudinal axis is preferred to be parallel to the
transport direction of the printed-circuit board;
– smaller than 1.27 mm, the footprint longitudinal axis
must be parallel to the transport direction of the
printed-circuit board.
The footprint must incorporate solder thieves at the
downstream end.
• Forpackages with leads onfoursides, the footprint must
be placed at a 45° angle to the transport direction of the
printed-circuit board. The footprint must incorporate
solder thieves downstream and at the side corners.
During placement and before soldering,the packagemust
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Typical dwell time is 4 seconds at 250 °C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Manual soldering
Fix the component by first soldering two
diagonally-opposite end leads. Use a low voltage (24 V or
less) soldering iron applied to the flat part of the lead.
Contact time must be limited to 10 seconds at up to
300 °C.
When using a dedicated tool, all other leads can be
soldered in one operation within 2 to 5 seconds between
270 and 320 °C.
2000 Dec 1313
Page 14
Philips SemiconductorsProduct specification
Very low dropout voltage/quiescent current
TDA3661
adjustable voltage regulator
Suitability of surface mount IC packages for wave and reflow soldering methods
1. All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the maximum
2. These packages are not suitable for wave soldering as a solder joint between the printed-circuit board and heatsink
3. If wave soldering is considered, then the package must be placed at a 45° angle to the solder wave direction.
4. Wave soldering is only suitable for LQFP, TQFP and QFP packages with a pitch (e) equal to or larger than 0.8 mm;
5. Wave soldering is only suitable forSSOP and TSSOP packages with a pitch (e) equalto or larger than 0.65 mm; it is
, SO, SOJsuitablesuitable
temperature (with respect to time) and body size of the package, there is a risk that internal or external package
cracks may occur due to vaporization of the moisture in them (the so called popcorn effect). For details, refer to the
Drypack information in the
(at bottom version) can not be achieved, and as solder may stick to the heatsink (on top version).
The package footprint must incorporate solder thieves downstream and at the side corners.
it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.
definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm.
Objective specificationDevelopmentThis data sheet contains the design target or goal specifications for
Preliminary specificationQualificationThis data sheet contains preliminary data, and supplementary data will be
Product specificationProductionThis data sheet contains final specifications. Philips Semiconductors
Note
1. Please consult the most recently issued data sheet before initiating or completing a design.
DEFINITIONS
Short-form specification The data in a short-form
specification is extracted from a full data sheet with the
same type number and title. For detailed information see
the relevant data sheet or data handbook.
Limiting values definition Limiting values given arein
accordance with the Absolute Maximum Rating System
(IEC 60134). Stress above one or more of the limiting
values may cause permanent damage to the device.
These are stress ratings only and operation of the device
atthese or atany otherconditionsabove those giveninthe
Characteristics sections of the specification is not implied.
Exposure to limiting values for extended periods may
affect device reliability.
Application information Applications that are
described herein for any of these products are for
illustrative purposes only. Philips Semiconductors make
norepresentationor warranty that suchapplicationswillbe
suitable for the specified use without further testing or
modification.
PRODUCT
STATUS
DEFINITIONS
product development. Specification may change in any manner without
notice.
published at a later date. Philips Semiconductors reserves the right to
make changes at any time without notice in order to improve design and
supply the best possible product.
reserves the right to make changes at any time without notice in order to
improve design and supply the best possible product.
DISCLAIMERS
Life support applications These products are not
designed for use in life support appliances, devices, or
systems where malfunction of these products can
reasonably be expectedto result in personal injury.Philips
Semiconductorscustomersusing or selling theseproducts
for use in such applications do so at their own risk and
agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Right to make changes Philips Semiconductors
reserves the right to make changes, without notice, in the
products, including circuits, standard cells, and/or
software, described or contained herein in order to
improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for
theuse of any ofthese products,conveysno licence or title
under any patent, copyright, or mask work right to these
products,and makes norepresentationsor warranties that
these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified.
(1)
2000 Dec 1315
Page 16
Philips Semiconductors – a w orldwide compan y
Argentina: see South America
Australia: 3 Figtree Drive, HOMEBUSH, NSW 2140,
United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409,
Tel. +1 800 234 7381, Fax. +1 800 943 0087
Uruguay: see South America
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Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD,
Tel. +381 11 3341 299, Fax.+381 11 3342 553
For all other countries apply to: Philips Semiconductors,
Marketing Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN,
The Netherlands, Fax. +31 40 27 24825
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.
2000
Internet: http://www.semiconductors.philips.com
70
Printed in The Netherlands753503/04/pp16 Date of release: 2000 Dec 13Document order number: 9397 750 07864
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