Philips TEA1102TS, TEA1102T, TEA1102 Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TEA1102; TEA1102T;
TEA1102TS

Fast charge ICs for NiCd, NiMH,
SLA and LiIon

Preliminary specification
Supersedes data of 1997 Oct 09
File under Integrated Circuits, IC03

1999 Jan 27

Philips Semiconductors Preliminary specification

Fast charge ICs for NiCd, NiMH, SLA and
LiIon

FEATURES

• Safe and fast charging of Nickel Cadmium (NiCd),
Nickel Metal Hydride (NiMH), Lithium Ion (LiIon), and
Sealed Lead Acid (SLA) batteries

• Three charge states for NiCd or NiMH; fast, top-off and
trickle or voltage regulation (optional)

• Two charge states for LiIon or SLA; current and voltage
limited

• Adjustable fast charge current [0.5CA to 5CA nominal
(CA = Capacity Amperes)]

• DC top-off and pulsating trickle charge current (NiCd
and NiMH)

• Temperature dependent ∆T/∆t battery full detection

• Automatic switch-over to accurate peak voltage
detection (−

• Possibility to use both ∆T/∆t and peak voltage detection

as main fast charge termination

• Support of inhibit during all charging states

• Manual refresh with regulated adjustable discharge

current (NiCd and NiMH)

• Voltage regulation in the event of no battery

• Support of battery voltage based charge indication and

buzzer signalling at battery insertion, end of refresh and
at full detection

• Single, dual and separate LED outputs for indication of
charge status state

• Minimum and maximum temperature protection

• Time-out protection

• Short-circuit battery voltage protection

• Can be applied with few low-cost external components.

1

⁄4%) if no NTC is applied

TEA1102; TEA1102T;

TEA1102TS

GENERAL DESCRIPTION

The TEA1102x are fast charge ICs which are able fast
charge NiCd and NiMH, SLA and Lilon batteries.

The main fast charge termination for NiCd and NiMH
batteries are ∆T/∆t and peak voltage detection, both of
which are well proven techniques. The TEA1102x
automatically switches over from ∆T/∆t to peak voltage
detection if the thermistor fails or is not present. The ∆T/∆t
detection sensitivity is temperature dependent, thus
avoiding false charge termination. Three charge states
can be distinguished; fast, top-off and trickle.

Charging Lilon and SLA batteries is completely different.
When the batteries reach their maximum voltage
(adjustable), the TEA1102x switches over from current
regulation to voltage regulation. After a defined time
period, which is dependent on battery capacity and charge
current, charge is terminated. Due to small self discharge
rates of Lilon and SLA batteries, trickle charge can be
omitted.

Several LEDs, as well as a buzzer, can be connected to
the TEA1102x for indicating battery insertion, charge
states, battery full condition and protection mode.

The TEA1102x are contained in a 20-pin package and are
manufactured in a BiCMOS process, essentially for
integrating the complex mix of requirements in a single
chip solution. Only a few external low cost components are
required in order to build a state of the art charger.

ORDERING INFORMATION

TYPE

NUMBER

TEA1102 DIP20 plastic dual in-line package; 20 leads (300 mil) SOT 146-1
TEA1102T SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
TEA1102TS SSOP20 plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1

1999 Jan 27 2

NAME DESCRIPTION VERSION

PACKAGE

Philips Semiconductors Preliminary specification

Fast charge ICs for NiCd, NiMH, SLA and
LiIon

TEA1102; TEA1102T;

TEA1102TS

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

P

I

P

∆V

NTC/VNTC

∆V

bat/Vbat

I

Vbat

V

bat(l)

supply voltage 5.5 − 11.5 V
supply current outputs off − 4 − mA
temperature rate dependent

(∆T/∆t) detection level
voltage peak detection level with

respect to top value
input current battery monitor V
voltage at pin 19 for detecting low

V

NTC

=2V;

−−0.25 − %

Tj= 0 to 50 °C
V

bat

=2V;

−−0.25 − %

Tj= 0 to 50 °C

= 0.3 to 1.9 V − 1 − nA

bat

− 0.30 − V

battery voltage

I

IB

battery charge current fast charge 10 − 100 µA

top-off mode − 3 −µA

I

IB(max)

maximum battery charge current voltage regulation full

− 10 −µA

NiCd and NiMH battery

I

IB(Lmax)

f

osc

V

reg

maximum load current no battery − 40 −µA
oscillator frequency 10 − 200 kHz
regulating voltage LiIon − 1.37 − V

SLA − 1.63 − V
NiCd and NiMH

(pin V

open-circuit)

stb

− 1.325 or
V

stb

− V

open battery − 1.9 − V

1999 Jan 27 3

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1999 Jan 27 4

BLOCK DIAGRAM

Fast charge ICs for NiCd, NiMH, SLA and

LiIon

Philips Semiconductors Preliminary specification

MTV

NTC

V

bat

19 1 20 14

PROTECTION

NTC

3.3 V

2.8 V

4.25 V

156
kΩ

1 V

9

12
kΩ

0.75 V
36

kΩ

8

present

0.3 V

T

min

T

max

1.9 V

T

cut-off

DA/AD

CONVERTER

1 V

battery
low

end
refresh

no­battery

V

bat

V

stb

CHARGE CONTROL

AND

OUTPUT DRIVERS

1.325 V/V

stb

NiCd

NIMH

CONTROL LOGIC

R

1.37 V
Llion

SUPPLY

BLOCK

ref

V
V

bat
reg

1.63 V
SLA

charge

1.25/R

1.9 V
no­battery

TEA1102

fast

OSC

top

standby

current

10 µA

load

current

40 µA

A1

4.25 V

100 mV

off

3 µA

ref

LS

OSC

PWM

SET

A2

A3

4×

A4

TIMER

AND

CHARGE

STATUS

INDICATION

RSQ

refresh

15

PWM

17

LS

18

AO

10

RFSH

2

IB

4

PSD

5

LED

TEA1102; TEA1102T;

6

POD

7

PTD

12 13 16 113

V

V

P

V

sl

Fig.1 Block diagram.

handbook, full pagewidth

S

GND FCT

MGC818

TEA1102TS

Philips Semiconductors Preliminary specification

Fast charge ICs for NiCd, NiMH, SLA and
LiIon

PINNING

SYMBOL PIN DESCRIPTION

V

stb

IB 2 charge current setting
GND 3 ground
PSD 4 program pin sample divider
LED 5 LED output
POD 6 program pin oscillator divider
PTD 7 program pin time-out divider
NTC 8 temperature sensing input
MTV 9 maximum temperature voltage
RFSH 10 refresh input/output
FCT 11 fast charge termination and

V

P

V

sl

OSC 14 oscillator input
PWM 15 pulse width modulator output
V

S

LS 17 loop stability pin
AO 18 analog output
V

bat

R

ref

1 standby regulation voltage input

(NiCd and NiMH)

battery chemistry identification
12 positive supply voltage
13 switched reference voltage output

16 stabilized reference voltage

19 single-cell battery voltage input
20 reference resistor pin

handbook, halfpage

TEA1102; TEA1102T;

V

1

stb

IB

2
3

GND

4

PSD

5

LED

POD

PTD
NTC

MTV

RFSH

TEA1102

6
7
8
9

10

MBH067

Fig.2 Pin configuration.

TEA1102TS

R

20

ref

V

19

bat

18

AO
LS

17

V

16

S

PWM

15

OSC

14

V

13

sl

V

12

P

11

FCT

1999 Jan 27 5

Philips Semiconductors Preliminary specification

Fast charge ICs for NiCd, NiMH, SLA and
LiIon

INTRODUCTION

All battery types are initially fast charged with an
adjustable high current. Fast charge termination depends
upon the battery type. With NiCd and NiMH batteries the
main fast charge termination will be the∆T/∆t (temperature
detection) and/or peak voltage detection and with SLA and
LiIon batteries when the battery voltage reaches

2.45 or 4.1 V respectively.
The fast charge period is followed by a top-off period for

NiCd and NiMH batteries and by a fill-up period for SLA
and LiIon batteries. During the top-off period the NiCd and
NiMH batteries are charged to maximum capacity by
reduced adjustable charge current.

During the fill-up period the SLA and LiIon batteries are
charged to maximum capacity by a constant voltage and a
gradually decreasing current. The fill-up and top-off period
ends after time-out or one hour respectively.

After the fill-up or top-off period, the TEA1102x switches
over to the standby mode. For NiCd and NiMH batteries
either the voltage regulation or trickle charge mode can be
selected. The voltage regulation mode is selected when
the battery includes a fixed load. Trickle charge prevents a
discharge of the battery over a long period of time.
For SLA and LiIon batteries the charge current is disabled
during standby. The fast charge mode is entered again
when the battery voltage reaches 1.5 V (SLA) or 3 V
(LiIon).

Charging principles

TEA1102; TEA1102T;

TEA1102TS

voltage peak detection, fast charging is also protected by
temperature cut-off and time-out.

To avoid false fast charge termination by peak voltage
detection or ∆T/∆t, full detection is disabled during a short
hold-off period at the start of a fast charge session. After
fast charge termination, the battery is extra charged by a
top-off period. During this period of approximately one
hour, the charge current is lowered thus allowing the
battery to be charged to nearly 100% before the system
switches over to standby.

After the battery has been charged to nearly 100% by the
top-off period, discharge of the battery (caused by a load
or by the self-discharge) can be avoided by voltage
regulation or by trickle charge.

If batteries are charged in combination with a load, the
TEA1102x can be programmed to apply voltage regulation
during the standby mode. In this way, discharge of the
battery caused by self-discharge or by an eventual load is
avoided. The regulating voltage is adjustable to the
voltage characteristic of the battery. For battery safety the
charge current is limited and the temperature is monitored
during voltage regulation. If a trickle charge is applied, the
self-discharge of the battery will be compensated by a
pulsating charge current.

To avoid the so called ‘memory effect’ in NiCd batteries, a
refresh can be manually activated.The discharge current is
regulated by the IC in combination with an external power
transistor. After discharging the battery to 1 V per cell, the
system automatically switches over to fast charge.

HARGING NiCd/NiMH BATTERIES

C
Fast charging of the battery begins when the power supply

voltage is applied and at battery insertion.
During fast charge of NiCd and NiMH batteries, the battery

temperature and voltage are monitored. Outside the
initialized temperature and voltage window, the system
switches over to the top-off charge current.

The TEA1102x supports detection of fully charged NiCd
and NiMH batteries by either of the following criteria:

•∆T/∆t

• Voltage peak detection.

If the system is programmed with ∆T/∆t and V
or V
automatically switches to voltage peak detection if the
battery pack is not provided with a temperature sensing
input (NTC). In this way both packages, with and without
temperature sensor, can be used randomly independent of
the applied full detection method. Besides ∆T/∆t and/or

1999 Jan 27 6

as the main fast charge termination, it

peak

peak

or,∆T/∆t

CHARGING LiION/SLA BATTERIES
Charging these types of batteries differs considerably from

charging NiCd and NiMH batteries. The batteries will be
charged with a charge current of 0.15 CA if their cell
voltage is below the minimum voltage of 0.9 V for Lilon or

0.45 V for SLA. With batteries in good condition the battery
voltage will rise above 0.9 V in a short period of time.
When the batteries are short-circuited the voltage will not
rise above 0.9 V within one hour and the system will
change over to cut-off, which means that the output drivers
AO and PWM are fixed to zero and that battery charge can
only be started again after a power-on reset. If the battery
voltage of a good condition battery is above the minimum
level of 0.9 V the battery will be charged with the
programmed fast charge current.

If Lilon or SLA batteries are used, ‘full’ is detected when
the battery voltage reaches 4.1 and 2.45 V respectively.
At this point the TEA1102x switches from current
regulation to voltage regulation (fill-up mode).

Philips Semiconductors Preliminary specification

Fast charge ICs for NiCd, NiMH, SLA and
LiIon

After the ‘fill-up’ period the charge current is not regulated,
which means that the output drivers AO and PWM are
fixed to zero. When the battery voltage becomes less than
3 V for Lilon and 1.5 V for SLA, the IC enters the fast
charge mode again.

FUNCTIONAL DESCRIPTION
Control logic

The main function of the control logic is to support the
communication between several blocks. It also controls
the charge method, initialization and battery full detection.
The block diagram of the TEA1102x is illustrated in Fig.1.

Conditioning charge method and initializations

At system switch-on, or at battery insertion, the control
logic sets the initialization mode in the timer block. After
the initialization time the timer program pins can be used
to indicate the charging state using several LEDs.
The charge method is defined at the same time by the
following methods:

• If the FCT pin is 0 or 1.25 V, indicating that SLA or LiIon
batteries have to be charged, the battery will be charged
by limit current and limit voltage regulation. Without
identification (FCT pin floating), the system will charge
the battery according to the charge characteristic of
NiCd and NiMH batteries.

TEA1102; TEA1102T;

TEA1102TS

• The standby charge method (NiCd and NiMH), trickle
charge or voltage regulation, is defined by the input pin
V

. By biasing this voltage with a set voltage, the output

stb

voltage will be regulated to the V
is connected to VS, or no NTC is connected the system
applies trickle charge.

If pin RFSH is connected to ground by depressing the
switch, the TEA1102x discharges the battery via an
external transistor connected to pin RFSH. The discharge
current is regulated with respect to the external (charge)
sense resistor (R

). End-of-discharge is reached when

sense

the battery is discharged to 1 V per cell. Refreshing the
battery can only be activated during charging of NiCd and
NiMH batteries. When charging LiIon and SLA batteries,
discharge before charge is disabled.

The inhibit mode has the main priority. This mode is
activated when the V

input pin is connected to ground.

stb

Inhibit can be activated at any charge/discharge state,
whereby the output control signals will be zero, all LEDs
will be disabled and the charger timings will be set on hold.
Table 1 gives an operational summary.

set voltage. If this pin

stb

Table 1 Functionality of program pins

FUNCTION FCT NTC RFSH V

Inhibit X

(1)

LiIon and SLA detection low X
Refresh (NiCd and NiMH) not low

(2)

(1)

X

(1)
(1)

X

(1)

X

(1)

X
low not low

stb

low
X

(1)

∆T/∆t detection floating note 3 not low not low
∆T/∆t and voltage peak detection high note 3 not low not low

Voltage peak detection not low note 4 not low not low
Trickle charge at standby not low X

(1)

not low high

not low note 4 not low not low

Voltage regulation at standby not low note 3 not low floating

Notes

1. Where X = don’t care.

2. Not low means floating or high.

3. The NTC voltage has been to be less than 3.3 V, which indicates the presence of an NTC.

4. The NTC voltage is outside the window for NTC detection.

5. V

has to be floating or set to a battery regulating voltage in accordance with the specification.

stb

1999 Jan 27 7

(5)

Philips Semiconductors Preliminary specification

Fast charge ICs for NiCd, NiMH, SLA and
LiIon

Supply block

The supply block delivers the following outputs:

• A power-on reset pulse to reset all digital circuitry at
battery insertion or supply switch-on. After a general
reset the system will start fast charging the battery.

• A 4.25 V stabilized voltage source (VS) is externally
available. This source can be used to set the thermistor
biasing, to initialize the programs, to supply the external
circuitry for battery voltage based charge indication and
to supply other external circuitry.

• A 4.25 V bias voltage (V
indication LEDs. This output pin will be zero during the
initialization period at start-up, thus avoiding any
interference of the extra LEDs when initializing.

Charge control

The charge current is sensed via a low-ohmic resistor
(R

), see Fig.4. A positive voltage is created across

sense

resistor Rb by means of a current source I
R

in the event of fast charge and by an internal bias

ref

current source in the event of top-off and trickle charge
(IIB), see Fig.1. The positive node of Rb will be regulated to
zero via error amplifier A1, which means that the voltage
across Rb and R

sense

current is defined by the following equation:

I

× RbI

fastRsense

×=

The output of amplifier A1 is available at the loop stability
pin LS, consequently the time constant of the current loop
can be set. When V

peak

current sensing for the battery voltage will be reduced,
implying that the charge current will be regulated to zero
during:

t

sense

210POD× t

Actually battery voltage sensing takes place in the last
oscillator cycle of this period.

To avoid modulation on the output voltage, the top-off
charge current is DC regulated, defined by the following
equation:

I

top off–

R

× Rb310

sense

where:

t

top off–

227TOD× t

The top-off charge current will be approximately 0.15 CA,
which maximizes the charge in the battery under safe and
slow charging conditions. The top-off charge period will be
approximately one hour, so the battery will be extra

) is available for use for more

sl

which is set by

ref

will be the same. The fast charge

ref

(NiCD and NiMH) is applied, the

×=

osc

6–

××=

×=

osc

(1)

(2)

(3)

(4)

TEA1102; TEA1102T;

TEA1102TS

charged with approximately 0.15 Q. In this way the battery
is fully charged before the system switches over to
standby.

When pin 1 (V
connected the system compensates the (self) discharge of
the battery by trickle charge. The trickle charge current will
be pulsating, defined by the following equation:

I

× R

trickleRsense

During the non current periods at trickle charge the charge
current is regulated to zero, so that the current for a load
connected in series across the battery with the sense
resistor will be supplied by the power supply and not by the
battery.

If at pin 1 (V
with the specification, and no NTC is connected the charge
mode will switch over from current to voltage regulation
after top-off. The reference regulating voltage can be
adjusted to the battery characteristic by external resistors
connected to pin V

This reference voltage has to be selected in such a way
that it equals the rest voltage of the battery. By using
voltage regulation, the battery will not be discharged at a
load occurrence. If the V
TEA1102x will apply voltage regulation at 1.325 V during
the standby mode (NiCd and NiMH). The current during
voltage regulation is limited to 0.5 CA. If the battery charge
current is maximized to 0.5 CA for more than 2 hours
charging will be stopped. Moreover, if the temperature
exceeds T
As voltage regulation is referred to one cell, the voltage on
the V

pin must be the battery voltage divided by the

bat

number of cells (NiCd and NiMH).
For LiIon or SLA batteries, the battery is extra charged

after full detection by constant voltage regulation during a
certain fill-up period. LiIon and SLA batteries have to
identify themselves by an extra pin on the battery pack to
ground, which is connected via a resistor to pin 11 (FCT).
As the battery voltage sense (V
a one cell voltage of NiCd and NiMH packages, the V
input pin will be regulated to 1.367 and 1.633 V during
fill-up for LiIon and SLA respectively. In this way this
system can accept a mixture of one LiIon, two SLA and
three NiCd or NiMH packages.

After fill-up, charging of LiIon or SLA batteries is disabled.
The battery charge is then fixed to zero, ensuring
maximum life-cycle of the battery.

Because of a fixed zero charge current, the battery will be
discharged if a load is applied.

) is connected to VS, or no NTC is

stb

15

× 10

------

b

16

) a reference voltage is set in accordance

stb

.

stb

stb

, charging will be stopped completely.

max

6–

×=

input pin is floating, the

) has to be normalized to

bat

(5)

bat

1999 Jan 27 8

Philips Semiconductors Preliminary specification

Fast charge ICs for NiCd, NiMH, SLA and
LiIon

To ensure an eventual load during all charging states, the
fast charge mode will be entered again if the battery
voltage drops below 15 V for SLA or 3 V for Lilon.

When charging, the standby mode (LiIon and SLA) can
only be entered after a certain period of time depending on
time-out. The same applies for charging NiCd or NiMH
batteries. To support full test of the TEA1102x at
application, the standby mode is also entered when
V

bat<Vbat(l)

Timer

The timing of the circuit is controlled by the oscillator
frequency.

The timer block defines the maximum charging time by
‘time-out’. At a fixed oscillator frequency, the time-out time
can be adapted by the Programmable Time-out Divider
(PTD) using the following equation.

time out–

at fill-up or top-off respectively.

226POD× PTD× t

×=

osc

(6)t

TEA1102; TEA1102T;

TEA1102TS

The time-out timer is put on hold by low voltage,
temperature protection and during the inhibit mode.
The Programmable Oscillator Divider (POD) enables the
oscillator frequency to be increased without affecting
the sampling time and time-out. Raising the oscillator
frequency will reduce the size of the inductive components
that are used.

At fast charging, after battery insertion, after refresh or
supply interruption, the full detector will be disabled for a
period of time to allow a proper start with flat or inverse
polarized batteries. This hold-off period is disabled at fast
charging by raising pin V
So for test options it is possible to slip the hold-off period.
The hold-off time is defined by the following equation:

t

hold off–

25–t

×=

time out–

Table 2 gives an overview of the settings of timing and
discharge/charge currents.

to above ±5 V (once).

stb

(7)

Table 2 Timing and current formulae

SYMBOL DESCRIPTION FORMULAE

t

osc

T
T
t

top-off 2

t

time-out 2

t

hold-off 2

t

LED

t

sense 2

t

switch 2

I

fast

I

top-off

I

trickle

I

load-max

I

RFSH

(∆T/∆t) NTC voltage sampling frequency

sampling

(V

sampling

) battery voltage sampling frequency

peak

timing see Fig.3

inhibit or protection

charge/discharge currents

17

× POD × PSD × t

2

16

× POD × t

2

27

× POD × t

26

× POD × PTD × t

−5

× t

time-out

14

× POD × t

2

10

× POD × t

21

× POD × PTD × t

V

R

b

×

----------------­R

sense

----------------­R

sense

----------------­R

sense

----------------­R

sense

100 mV

-------------------­R

R

b

R

b

R

b

sense

---------­R

3× 10

15

× 10

-----­16

40× 10

ref
ref

×

osc
osc
osc

osc

osc
osc

osc

6–

6–

×

6–

×

1999 Jan 27 9