TEA1104 [NXP]
Cost effective battery monitor and fast charge IC for NiCd and NiMH chargers; 高性价比的电池监测和快速充电IC，适用于镍镉电池和镍氢电池充电器
| 型号： | TEA1104 |
| 厂家： | 
NXP |
| 描述： | Cost effective battery monitor and fast charge IC for NiCd and NiMH chargers |
| 文件： | 总16页 (文件大小：123K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
DATA SHEET
TEA1104; TEA1104T
Cost effective battery monitor and
fast charge IC for NiCd and NiMH
chargers
1996 Feb 26
Objective specification
File under Integrated Circuits, IC03
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
FEATURES
APPLICATIONS
• Accurate detection of fully charged batteries by
currentless peak voltage sensing
• Portable telephone
• Portable computer
• Portable audio
• Switch-over from fast to safe trickle charge current at
battery full detection
• Portable video.
• Fast charge termination back-up by maximum time and
maximum temperature detection
GENERAL DESCRIPTION
• Several trickle charge drive possibilities for mains
isolated and non-mains isolated systems
The TEA1104 is manufactured in a BiCMOS process
intended to be used as a battery monitor circuit in charge
systems for NiCd and NiMH batteries. It is especially
designed for cost effective compact consumer
applications.
• Battery checking to protect against short-circuited and
open batteries
• Battery monitor allows recharging of different battery
packs in the same charger
The circuit is able to detect fully charged batteries by
currentless battery voltage sensing. Several output drive
functions are available to control the (reduced) trickle
charge current to keep the batteries full with maximum life
expectations.
• Dual LED indicator provision
• External regulator not required because of large input
voltage range
• Few low cost external components required.
The battery full detection is backed up by two independent
mechanisms to make the system fail safe; maximum time
and maximum temperature.
QUICK REFERENCE DATA
SYMBOL
VP
PARAMETER
supply voltage
CONDITIONS
MIN.
5.45
TYP.
MAX.
11.5
UNIT
−
−
−
V
IP
supply current
outputs off
−
3
mA
V
Vbat
voltage range of battery full detection
0.81
−
3.6
−
∆Vbat/Vbat
voltage peak detection level with
respect to top value
0.25
%
Ibat
battery monitor input current
battery voltage protection low
battery voltage protection high
oscillator frequency
−
−
1
nA
V
Vbat(l)
Vbat(h)
fosc
−
0.81
3.6
−
0.91
−
3.5
10
V
100
kHz
ORDERING INFORMATION
TYPE
PACKAGE
NUMBER
NAME
DESCRIPTION
VERSION
TEA1104
DIP8
SO8
plastic dual in-line package; 8 leads (300 mil)
SOT97-1
SOT96-1
TEA1104T
plastic small outline package; 8 leads; body width 3.9 mm
1996 Feb 26
2
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
BLOCK DIAGRAM
R
V
ref
S
5
3
6
V
P
SUPPLY
POR
battery high
protection
OR
8
fast
LED
trickle
FILTER
MODE
LATCH
CONTROL
4
1
V
bat
GND
BATTERY
FULL
DETECTOR
SAMPLE-
AND-HOLD
battery low
protection
TO
trickle
OR
T
max
TIMER
T
TEA1104
TEA1104T
min
T
OSCILLATOR
cut-off
2
7
MGE354
NTC
OSC
Fig.1 Block diagram.
3
1996 Feb 26
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
PINNING
SYMBOL
PIN
DESCRIPTION
GND
NTC
1
2
ground
handbook, halfpage
GND
NTC
1
2
3
4
8
7
6
5
LED
negative temperature coefficient
resistor input
OSC
TEA1104
VS
3
4
5
6
7
8
stabilized supply voltage
battery voltage sensing
reference resistor
positive supply voltage
oscillator input
V
P
V
s
Vbat
Rref
VP
R
V
ref
bat
MGE353
OSC
LED
Fig.2 Pin configuration.
LED output
• Trickle charge is active if:
– battery full is detected
INTRODUCTION
The operation of the TEA1104; TEA1104T is explained
with the aid of the application diagram illustrated in Fig.7.
– maximum time is exceeded
– maximum cut-off temperature is exceeded after the
initial phase.
An application note (AN95085) is available describing the
versatility of the TEA1104; TEA1104T.
An external power current source charges the batteries via
an electronic switch which is controlled by the TEA1104.
The TEA1104 monitors the battery voltage. Fully charged
batteries are detected when the battery voltage peaks. In
fact, a voltage drop of 0.25% with respect to the top value
is detected. Fast charging is initiated at ‘power on’ or at
‘replaced batteries’. The switch is continuously on,
providing that all protection levels are met. At battery full
detection, the charge current is duty cycled to reduce the
average charge current to a lower level, keeping the
batteries fully charged but at he same time assuring long
battery life. In Fig.3 the battery voltage during fast charge
is plotted.
Supply block
For correct start-up, the IC supply current is limited to
35 µA (typ.) until the start-up voltage of 6.4 V is reached
(standby mode). Thereafter, the operating supply voltage
VP has to be within the window of 5.45 to 11.5 V, meaning
that there is no need for an external voltage regulator to
supply the IC.
The supply block delivers the following outputs:
• With the help of an external resistor (pin Rref), a
reference current is obtained which defines the
accuracy of all IC timing characteristics
• Externally available 4.25 V stabilized voltage source
(Vsource). This source is used internally to supply a large
part of the circuit and can be used to set the NTC biasing
and to supply other external circuitry with a maximum
current of 1 mA. Protection information is provided via
VS, to design a dual LED indicator
FUNCTIONAL DESCRIPTION
A block diagram of the TEA1104; TEA1104T is illustrated
in Fig.1
Mode latch
• Power-on reset pulse resets all digital circuitry after a
start or restart, due to an interrupted VS.
The Mode latch determines if the system is in the fast or in
the slow charge mode.
• Fast charge is active at:
– power switch-on and battery connected
– temperature between minimum and maximum value
– battery insert
1996 Feb 26
4
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
• The battery voltage is sensed each ‘cycle time’. The
Open battery protection
cycle time is defined as:
When the rechargeable battery is removed, the output
voltage Vbat will rise to a high level. The ‘open battery
protection’ block will detect this voltage and the charge
current will be switched off. A digital filter prevents false
open battery protection. The open battery signal
(Vbat > 3.6 V) must be present for a duration of at least
4 clock pulses.
– Tcycle = 2 exp16 × tosc
• The ‘inhibit time’ is the time that the charger current is
disabled, after which the battery voltage is sensed in a
currentless way.
– tinhibit = 10 × tosc
Battery sampling takes one oscillator period for each
cycle interval.
Battery monitor
– tsample = tosc
One or two cell packs can be connected directly to Vbat
(battery connection) without an external resistor divider. At
larger cell packs the battery voltage must be scaled down
to a voltage range of 0.81 to 3.6 V. It is also possible to
take a tap on the chain of batteries. Battery full is
recognized by voltage peak detection (Vpeak), meaning a
decrease of 0.25% (typ.) with respect to the top value.
Keeping in mind a battery voltage range of 0.81 to 3.6 V
and an accuracy of 10% at Vbat = 2.4 V for battery full
detection, means that the internal ADC has to be 13 bits.
Several filters are included to prevent false full detection.
The series resistance of the battery and battery connection
can cause battery voltage fluctuations and therefore it is
necessary to stop the charging before sensing; this is
called the ‘inhibit time’. This will be performed
• The ‘disable time’ is present to correct start-up with flat
or polarized batteries. During the disable time, the
battery full detection is not active.
– tdisable = 2 exp −5 × time-out
The timer is reset by battery full detection, but is on hold
during the temperature and battery-low protection modes.
Temperature protection block
Temperature sensing is achieved by using a cheap
thermistor. Two temperature windows are built in:
• If the temperature at power-on reset is above the
maximum temperature protection level, the trickle
charge current is active. The same applies for
temperatures below the minimum temperature. Fast
charging starts when the temperature is in between the
minimum and the maximum temperature levels.
automatically via the regulation output pin LED. The
charging is stopped for ten oscillator periods at the end of
which sampling is performed. The battery voltage will now
be sensed in a currentless way.
• If the temperature is between the maximum and
minimum temperature at power-on reset, the fast charge
current level is active. If the temperature sinks below the
minimum temperature level, again the trickle charge
level is active. At rising temperature, the fast charge
current is latched off at the ‘cut off’ temperature level.
Timer/oscillator
The oscillator has a sawtooth shape.
The period time is defined by: tosc = K × Rref × Cosc
The oscillator frequency is used in the timer block. In this
block several important signals are created.
To avoid switching on and off with temperature, a
hysteresis is built in for low temperature level. If the
temperature protection is not necessary, pin ‘Negative
Temperature Coefficient resistor’ (NTC) must be
connected to pin Rref.
• Time-out for protecting the fast charge process in time.
Time-out is normally chosen to be 25% longer than the
associated fast charge time. So for a one hour charge
time, time-out = 1.25 hours. The relationship with the
oscillator period time is:
Battery low protections
– Time-out = 2 exp28 × tosc
When the battery voltage is less than 0.81 V, the circuit
assumes that there are short circuited batteries and the
charge current is reduced to the trickle charge level. If the
batteries are flat, the trickle charge current is able to raise
the battery voltage within an acceptable period of time,
after which fast charging starts.
• The duty factor in the trickle charge mode: The duty
factor is fixed to 1⁄40, meaning that the average:
– Itrickle = 1⁄40 × Ifast
– ton = 3⁄4 × 2 exp9 × tosc
– toff = 2 exp14 × tosc
.
1996 Feb 26
5
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
In non mains isolated systems, the current source can be
switched via the auxiliary winding (see Fig.6) using the
TEA140X power plugs.
Output drivers
Several output drive possibilities are supported by the
TEA1104, to limit the fast charge current and to indicate
the mode that the charge is in.
In the application section, an example is shown driving two
LEDs that are indicating fast charging, protection during
fast charging, full status and removed batteries. It is also
possible to output the same information via one LED only.
In mains isolated systems, output drive current is available
for a bipolar or MOS switching device. Moreover, current
regulators can be driven (see Fig.4).
MGE355
V
bat
full
detection
t
I
charge
fast charge (I
)
trickle charge (I
/40)
fast
fast
Fig.3 NiCd battery characteristics during a 1.25C charge cycle.
output
output
output
LM317
LED
LED
LED
TEA1104
TEA1104
TEA1104
MGE356
Fig.4 Output drivers.
1996 Feb 26
6
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
START
no
no
V
> 11.5 V
6.2 V < V < 11.5 V
V < 5.25 V
s
s
s
yes
yes
yes
total reset logic
clamp at 11.5 V
circuit non-active
≤ 45 µA
set TIME OUT (e.g. 111 min)
I
= 25 mA
DDmax
I
o
DD
set T
T
(e.g. 48 C)
o
max
circuit active
(e.g. 20 C)
min
circuit active
V
< 0.81 V
< T
bat
or T
no
bat
min
or T
> T
bat
max
(note 1)
yes
trickle charge
I
/ 40
fast
yes
FAST
dual LED
indication
(note 2)
no
blinks
yes
FULL
OFF
FAST
blinks
0.81 V < V
< 3.6 V
no
bat
(note 3)
and
< T
T
< T
max
min
bat
(note 5)
yes
FAST charge
stop charge
total reset
open battery
o
set T
(e.g. 55 C)
cut-off
yes
FAST
ON
FAST
no
no
dual LED
indication
dual LED
indication
OFF
yes
yes
FULL
FAST
FULL
OFF
FAST
ON
OFF
OFF
-∆V
≥ 0.25%
and
> 3% TO
o
≥ 55 C
bat
no
no
no
T
TIME OUT > 111 min
bat
(TCO)
(TO)
t
dis
MGE359
battery is FULL
trickle charge
I
/ 40
fast
(note 4)
(1) Vbat < 0.81 V due to empty or flat battery.
yes
(2) For single LED application see Fig.7, for dual LED
application see Fig.6.
FAST
no
dual LED
indication
(3) Vbat > 3.6 V due to system occurrence or an external
blinks
inhibit via pin Vbat
.
yes
(4) Release via reset.
FULL
ON
FAST
(5) Tmin = VNTC ≥ 2 V; Tmax = VNTC ≤ 1 V;
Tcut-off = VNTC ≤ 0.81 V.
OFF
Fig.5 Flow chart of the TEA1104.
7
1996 Feb 26
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134); note 1.
SYMBOL
VP
PARAMETER
supply voltage
CONDITIONS
MIN.
−0.5
MAX.
+13.2
UNIT
V
V
V
VoLED
ViNTC
LED output voltage (pin 8)
−0.5
−0.5
VP
+5
negative temperature coefficient resistor
input voltage (pin 2)
Vi(OSC)
Vi(bat)
VRref
Isource
IoLED
IRref
oscillator input voltage (pin 7)
battery input voltage (pin 4)
reference resistor voltage (pin 5)
output source current
LED output current
−0.5
−0.5
−0.5
−3
+5
V
+5
V
+5
V
+0.01
25
mA
mA
mA
mA
mA
−
reference resistor current
battery current
−1
+0.01
+1
Ibat
−1
VP
supply current
−
25
Ptot
total power dissipation
Tamb = 70 °C
TEA1104
−
0.5
W
TEA1104T
−
0.35
+70
W
Tamb
Tj(max)
Tstg
operating ambient temperature
maximum operating junction temperature
storage temperature
−20
−
°C
°C
°C
+150
+150
−55
Note
1. All voltages are measured with respect to ground; positive currents flow into the IC. The voltage ratings are valid
provided that other ratings are not violated; current ratings are valid provided that the power rating is not violated.
QUALITY SPECIFICATION
In accordance with “SNW-FQ-611 part E”. The numbers of the quality specification can be found in the “Quality
Reference Handbook”. The handbook can be ordered using the code 9397 750 00192.
1996 Feb 26
8
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
CHARACTERISTICS
VP = 10 V; Tamb = 25 °C; Rref = 33 kΩ; COSC = 1 nF; unless otherwise specified.
SYMBOL
Supply
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VP
supply voltage
5.45
−
−
−
11.5
V
∆VP/∆t
Vclamp
Vstart
Vpd
supply voltage start rate
clamping voltage
start-up voltage
−
0.5
V/µs
V
Iclamp = 25 mA
11.5
6.1
4.65
−
12.8
6.7
6.4
5.05
−
V
power-down voltage level
supply current
5.45
3
V
IP
outputs off
VP = 4 V
mA
µA
V
Istart
VS
start-up current
−
45
50
stabilized voltage
IS = 1 mA
4.03
1.18
−
4.25
1.25
±60
4.46
1.31
±120
VRref
TCVref
voltage range at reference resistor IRref = 20 µA
V
temperature coefficient of the
reference voltage
Tamb = 0 to 45 °C
ppm/K
IRref
current range of the reference
resistor
10
−
100
µA
Temperature related input; NTC
Vi(co)
input voltage level for detecting
temperature cut-off
0.75
0.92
1.85
−5
0.81
1.0
2.0
−
0.87
1.08
2.15
+5
V
Vi(co; max)
Vi(co; min)
INTC
maximum input voltage level for
detecting temperature cut-off
V
minimum input voltage level for
detecting temperature cut-off
V
input current
VNTC = 1.5 V
µA
Output drivers
δLED
LED pulse duty factor
2.4
−
2.5
−
2.6
600
5
%
VLED(sat)
ILI(LED)
LED saturation voltage
ILED(sat) = 15 mA
VLED = 15 V
mV
µA
LED input leakage current
−
−
Battery monitor
Ii(bat)
input battery current
voltage range for peak detection
Vbat = 2.4 V
−
1
−
nA
V
Vbat
0.81
−
−
3.6
−
∆Vbat/Vbat
peak detection level with respect to Vbat = 2 V
top level
0.25
%
Tj
temperature range of peak
detection
0
−
50
°C
Protections; BAT
Vbat(l)
low level battery protection voltage
−
0.81
3.6
0.91
4.5
V
V
Vbat(h)
high level battery protection voltage
3.5
Oscillator
k
correction factor
frequency range
0.84
10
0.93
1.02
100
fosc
−
kHz
1996 Feb 26
9
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
In the trickle charge mode the LED output will pulsate with
APPLICATION INFORMATION
a repetition time; ttrickle = 2 exp14 × tosc = 0.28 s.
A guideline for the settings of TEA1104 and its external
components selection is given based on an example of a
1 hour charger for a 4 cell NiCd or NiMH battery pack. The
basic application diagram as illustrated in Fig.6 which is
based on the application diagram illustrated in Fig.7 with
some additional components; a 2 LED charge status
indication has been provided.
The duty factor of the pulse is 2.5% of ttrickle. This duty
factor also applies to the charge current as the charge
current switch is driven by the LED output. Therefore, the
average trickle charge current is Ifast /40. The Vbat input
can be adapted to the battery voltage via the resistor
dividers R1 and R2. When an NTC thermistor has been
incorporated into the battery, the minimum, maximum and
cut-off temperature levels can be set with the resistors R3
and R4. For an NTC with a common sensitivity of 3965
and adjustment resistor values R3 = 13 kΩ, R4 = 20 kΩ
the minimum, maximum and cut-off temperatures will be 5,
42 and 50 °C respectively.
For charging a battery within one hour the charge current
rating should be as follows:
Required minimum charge current = battery
capacity × 1.2/charge time.
Therefore, for a 1 Ah battery the external charge current
supply has to deliver at least 1.2 A.
The flow chart of the TEA1104; TEA1104A is given in
Fig.5. The load state of the batteries can be displayed by
one or two LEDs. The flow chart is not to be regarded as
sequential. Each mode of operation is a purely separate
continuous process.
TEA1104 settings
The fast charge back-up timer period, time-out, has to be
set in relation to the expected maximum charge time.
Normally, a safety back-up time is chosen approximately
25% longer than the maximum expected fast charge time.
For a one hour charger the time-out period can be set to
1.25 h.
Table 1 Dual LED indication
CHARGER
MODE
VLED
VS
LED 1 LED 2
Time-out relationship with the oscillator repetition time is
as follows;
Fast charging
low
high
high
on
off
off
Fast charging
protection
low/high
on/off
t
osc = time-out (h) × 3600/2 exp28
tosc = 17µs for time-out = 1.25 h
Full
low/high
high
low
off
off
on
off
(trickle charging)
tosc is set with the combination of Cosc and Rref;
Battery open
high
where tosc = 0.93 × Rref × Cosc
.
Rref can be chosen between 13 and 120 kΩ, but a 27 kΩ
resistor is recommended. The oscillator capacitor can be
calculated which is 668 pF; the nearest higher practical
value is 680 pF.
1996 Feb 26
10
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
+
V
= 6.5 to 12 V
P
+
+
BD434
1.2
kΩ
5.1
kΩ
R1
LED 2
FULL
LED1
FAST
270
Ω
BAW62
47
kΩ
100
kΩ
current
supply
4
cells
LED
V
V
V
bat
P
s
BC548
R3
R2
TEA1104
BC548
V
GND OSC
C
ref
NTC
osc
R
ref
R4
−θ
−
−
MGE357
Fig.6 Basic application diagram.
6
1
8
7
4
3
2
TEA1104
5
−θ
MGE358
Fig.7 Application diagram.
11
1996 Feb 26
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
PACKAGE OUTLINES
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
D
E
A
X
c
y
H
v
M
A
E
Z
5
8
Q
A
2
A
(A )
3
A
1
pin 1 index
θ
L
p
L
1
4
e
w
M
detail X
b
p
0
2.5
5 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
A
(1)
(1)
(2)
UNIT
A
A
A
b
c
D
E
e
H
L
L
p
Q
v
w
y
Z
θ
1
2
3
p
E
max.
0.25
0.10
1.45
1.25
0.49
0.36
0.25
0.19
5.0
4.8
4.0
3.8
6.2
5.8
1.0
0.4
0.7
0.6
0.7
0.3
mm
1.27
0.050
1.05
0.041
1.75
0.25
0.01
0.25
0.01
0.25
0.1
8o
0o
0.010 0.057
0.004 0.049
0.019 0.0100 0.20
0.014 0.0075 0.19
0.16
0.15
0.244
0.228
0.039 0.028
0.016 0.024
0.028
0.012
inches 0.069
0.01 0.004
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.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
EIAJ
95-02-04
97-05-22
SOT96-1
076E03S
MS-012AA
1996 Feb 26
12
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
DIP8: plastic dual in-line package; 8 leads (300 mil)
SOT97-1
D
M
E
A
2
A
A
1
L
c
w M
Z
b
1
e
(e )
1
M
H
b
b
2
8
5
pin 1 index
E
1
4
0
5
10 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
(1)
A
A
A
2
(1)
(1)
Z
1
w
UNIT
mm
b
b
b
c
D
E
e
e
L
M
M
H
1
2
1
E
max.
min.
max.
max.
1.73
1.14
0.53
0.38
1.07
0.89
0.36
0.23
9.8
9.2
6.48
6.20
3.60
3.05
8.25
7.80
10.0
8.3
4.2
0.51
3.2
2.54
0.10
7.62
0.30
0.254
0.01
1.15
0.068 0.021 0.042 0.014
0.045 0.015 0.035 0.009
0.39
0.36
0.26
0.24
0.14
0.12
0.32
0.31
0.39
0.33
inches
0.17
0.020
0.13
0.045
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
EIAJ
92-11-17
95-02-04
SOT97-1
050G01
MO-001AN
1996 Feb 26
13
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250 °C.
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.
WAVE SOLDERING
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our “IC Package Databook” (order code 9398 652 90011).
Wave soldering techniques can be used for all SO
packages if the following conditions are observed:
• A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.
DIP
SOLDERING BY DIPPING OR BY WAVE
• The longitudinal axis of the package footprint must be
parallel to the solder flow.
The maximum permissible temperature of the solder is
260 °C; solder at this temperature must not be in contact
with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.
• The package footprint must incorporate solder thieves at
the downstream end.
During placement and before soldering, the package must
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.
The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (Tstg max). If the
printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.
Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150 °C within
6 seconds. Typical dwell time is 4 seconds at 250 °C.
REPAIRING SOLDERED JOINTS
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300 °C it may remain in
contact for up to 10 seconds. If the bit temperature is
between 300 and 400 °C, contact may be up to 5 seconds.
REPAIRING SOLDERED JOINTS
Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) 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.
SO
REFLOW SOLDERING
Reflow soldering techniques are suitable for all SO
packages.
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
1996 Feb 26
14
Philips Semiconductors
Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
DEFINITIONS
Data sheet status
Objective specification
Preliminary specification
Product specification
This data sheet contains target or goal specifications for product development.
This data sheet contains preliminary data; supplementary data may be published later.
This data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). 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 at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
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 expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
1996 Feb 26
15
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SCDS47
© Philips Electronics N.V. 1996
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417021/1100/02/pp16
Date of release: 1996 Feb 26
9397 750 00692
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