SA57608CD-G [NXP]
暂无描述;型号: | SA57608CD-G |
厂家: | NXP |
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INTEGRATED CIRCUITS
SA57608
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
Product data
2003 Oct 29
Supersedes data of 2001 Oct 03
Philips
Semiconductors
Philips Semiconductors
Product data
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
SA57608
GENERAL DESCRIPTION
The SA57608 is a single-cell Li-ion protection IC, and is an improved
version of the NE57600, with different pinout. Its over and under
voltage accuracies are trimmed to within ± 25 mV (5%) over the
entire battery pack operating temperature range. The SA57608 is
available in various over and undervoltage limits.
There is a discharge overcurrent protection circuit which can protect
the battery pack against an accidental short-circuit. The overcharge
trip point has a time delay which can be programmed externally. It is
packaged in a space-saving 6-lead small outline package and
requires two external N-channel MOSFETs and a minimum of
passive parts.
FEATURES
APPLICATIONS
• Trimmed overvoltage trip point to within ±25 mV
• Cellular phones
• Programmable overvoltage trip time delay
• Trimmed undervoltage trip point to within ±25 mV
• Very Low undervoltage quiescent sleep current 0.05 mA
• Discharge overcurrent cutoff
• Personal digital assistants
• Palmtop computers
• Low operating current (10 mA)
• 6-lead small outline package (SOP004)
SIMPLIFIED SYSTEM DIAGRAM
V+
100 Ω
V
CC
5
0.01 µF
0.1 µF
VM
2
C
DLY
4
6
SA57608
Li-ION CELL
GND
3
1
DF
CF
1 kΩ
0.1 µF
V–
DISCHARGE
FET
CHARGE
FET
SL01568
Figure 1. Simplified system diagram.
2
2003 Oct 29
Philips Semiconductors
Product data
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
SA57608
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
TEMPERATURE
RANGE
DESCRIPTION
VERSION
SA57608XD
Plastic small outline package; 6 leads; body width 1.8 mm
SOP004
–20 to +85 °C
NOTE:
The device has six protection parameter options, indicated by the X on the order code, and defined in the following table.
TYPICAL PROTECTION PARAMETERS
Overcharge
detection voltage (V)
Overcharge detection
hysteresis voltage (mV)
Over-discharge
detection voltage (V)
Overcurrent
detection voltage (mV)
Part Number
SA57608Y
SA57608B
SA57608C
SA57608D
SA57608E
SA57608G
4.350 ±0.050
4.280 ±0.025
4.295 ±0.025
4.350 ±0.050
4.275 ±0.025
4.280 ±0.025
180
180
150
180
200
200
2.30 ±0.070
2.30 ±0.058
2.30 ±0.058
2.30 ±0.070
2.30 ±0.058
2.30 ±0.058
150 ±30
75 ±30
200 ±30
200 ±30
100 ±30
100 ±30
Part number marking
PIN CONFIGURATION
Each device is marked with a four letter code. The first three letters
designate the product. The fourth letter, represented by ‘x’, is a date
tracking code.
DF
VM
CF
GND
6
5
1
2
V
CC
Part number
SA57608YD
SA57608BD
SA57608CD
SA57608DD
SA57608ED
SA57608GD
Marking
A G X x
A G Y x
A G Z x
A H A x
A H B x
A H D x
C
DLY
4
3
SL01569
Figure 2. Pin configuration.
PIN DESCRIPTION
PIN
1
SYMBOL DESCRIPTION
DF
VM
CF
Discharge detection pin. This drives the gate of the discharge N-ch FET.
Monitor pin. Detects overcurrent and the presence of a charger.
Charge FET pin. This drives the gate of the charge control N-ch FET.
2
3
4
C
Charge Time Delay pin. The capacitor connected to this pin sets the delay.
Positive supply voltage input pin. Connect to positive terminal of the cell.
Ground pin. Connect to negative terminal of the cell.
DLY
CC
5
V
6
GND
MAXIMUM RATINGS
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
V
V
V
V
Input voltage
CF pin voltage
VM pin voltage
–0.3
+12
IN
V
V
– 28
V
V
+ 0.3
V
CF(max)
VM(max)
CC
CC
CC
CC
– 28
+ 0.3
V
T
Operating ambient temperature range
Storage temperature
–40
+85
°C
°C
mW
opr
T
stg
–40
–
+125
150
P
Power dissipation
D
3
2003 Oct 29
Philips Semiconductors
Product data
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
SA57608
ELECTRICAL CHARACTERISTICS
Characteristics measured with T
= 25 °C, unless otherwise specified.
amb
SYMBOL
PARAMETER
CONDITIONS
MIN.
1.5
–
TYP.
–
MAX.
10
UNIT
V
V
DD1
Operating input voltage
Supply current
V
V
V
V
– GND; Voltage defined as V to VM
CC
CC
CC
CC
DD
I
I
= 3.9 V; VM = 0 V
= 2.0 V
3.0
0.3
–
8.0
mA
mA
V
DD
SLP
Sleep current
–
0.6
V
Minimum operating voltage for 0 V
charging
– GND
–
1.2
DD(min)
OV1(th)
SA57608Y
SA57608B
4.30
4.255
4.27
4.30
4.25
4.255
–
4.35
4.280
4.295
4.350
4.275
4.280
180
180
150
180
200
200
2.30
2.30
2.30
2.30
2.30
2.30
150
75
4.40
4.305
4.32
4.40
4.3
V
V
SA57608C
SA57608D
SA57608E
SA57608G
SA57608Y
SA57608B
SA57608C
SA57608D
SA57608E
SA57608G
SA57608Y
SA57608B
SA57608C
SA57608D
SA57608E
SA57608G
SA57608Y
SA57608B
SA57608C
SA57608D
SA57608E
SA57608G
V
T
= 0 °C 50 °C;
amb
V
Over-charge voltage threshold
V
BATT
: L → H
V
V
4.305
–
V
mV
mV
mV
mV
mV
mV
V
–
–
–
–
V
Over-charge hysteresis
V
CC
V
CC
V
VM
: H → L
: H → L
: L → H
OV1(hyst)
–
–
–
–
–
–
2.23
2.242
2.242
2.23
2.242
2.242
120
45
2.37
2.358
2.358
2.37
2.358
2.358
180
105
230
230
130
130
4.22
93
V
V
V
UV(th)
Over-discharge threshold voltage
V
V
V
mV
mV
mV
mV
mV
mV
V
170
170
70
200
200
100
100
4.17
77
V
V
Overcurrent threshold
OC1(th)
70
Release voltage for over-discharge
Over-charge delay time
4.12
61
OV(rel)
OV(DLY)
OV
t
t
t
C
= 0.01 µF; V = 4.0 V to 4.4 V
ms
ms
ms
V
TD
CC
Over-discharge delay time
Over-current delay time
Short protection voltage
Short detect delay time
V
CC
= 3.6 V to 2.2 V
5
8
11
VM : 0 V → 0.5 V
9
13
17
OC(DLY)
V
OC2
V
CC
V
CC
V
CC
= 3.0 V
V
–1.2
V
–0.9
V
CC
–0.6
CC
CC
t
= 3.0 V
–
5
50
ms
kW
DLY(SC)
R
Reset resistance for excess current
protection
= 3.6 V; VM = 1.0 V
50
100
150
SC
V
V
V
V
Nch ON voltage of CFET
Pch ON voltage of CFET
Nch ON voltage of DFET
Pch ON voltage of DFET
I
I
I
I
= 50 mA; V = 4.4 V
–
0.35
3.7
0.2
3.7
0.5
–
V
V
V
V
CFET(off)
CFET(on)
DFET(off)
DFET(on)
OL
OH
OL
OH
CC
= 50 mA; V = 3.9 V
3.4
–
CC
= 50 mA; V = 2.2 V
0.5
–
CC
= 50 mA; V = 3.9 V
3.4
CC
4
2003 Oct 29
Philips Semiconductors
Product data
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
SA57608
as that provided by the SA57611. This provides two levels of
TECHNICAL DISCUSSION
overcharge protection, with the primary protection of the external
charge control circuit and the backup protection from the battery
pack’s protection circuit. The charge termination circuit will be set to
stop charging at a level around 50 mV less than the overvoltage
threshold voltage of the battery pack’s own protection circuit.
Lithium cell safety
Lithium-ion and lithium-polymer cells have a higher energy density
than that of nickel-cadmium or nickel metal hydride cells and have a
much lighter weight. This makes the lithium cells attractive for use in
portable products. However, lithium cells require a protection circuit
within the battery pack because certain operating conditions can be
hazardous to the battery or the operator, if allowed to continue.
Lithium cell operating characteristics
The internal resistance of lithium cells is in the 100 mΩ range,
compared to the 5–20 mΩ of the nickel-based batteries. This makes
the Lithium-ion and polymer cells better for lower battery current
applications (less than 1 ampere) as found in cellular and wireless
telephones, palmtop and laptop computers, etc.
Lithium cells have a porous carbon or graphite anode where lithium
ions can lodge themselves in the pores. The lithium ions are
separated, which avoids the hazards of metallic lithium.
If the lithium cell is allowed to become overcharged, metallic lithium
plates out onto the surface of the anode and volatile gas is
generated within the cell. This creates a rapid-disassembly hazard
The average operating voltage of a lithium-ion or polymer cell is
3.6 V as compared to the 1.2 V of NiCd and NiMH cells. The typical
discharge curve for Lithium cell is shown in Figure 3.
(the battery ruptures). If the cell is allowed to over-discharge (V
less than approximately 2.3 V), then the copper metal from the
cell
cathode goes into the electrolyte solution. This shortens the cycle
life of the cell, but presents no safety hazard. If the cell experiences
excessive charge or discharge currents, as happens if the wrong
charger is used, or if the terminals short circuit, the internal series
resistance of the cell creates heating and generates the volatile gas
which could rupture the battery.
V
OV
4.0
3.0
2.0
The protection circuit continuously monitors the cell voltage for an
overcharged condition or an overdischarged condition. It also
continuously monitors the output for an overcurrent condition. If
any of these conditions are encountered, the protection circuit opens
a series MOSFET switch to terminate the abnormal condition. The
lithium cell protection circuit is placed within the battery pack very
close to the cell.
V
UV
50
100
Charging control versus battery protection
NORMALIZED CELL CAPACITY (%)
The battery pack industry does not recommend using the pack’s
internal protection circuit to end the charging process. The external
battery charger should have a charge termination circuit in it, such
SL01553
Figure 3. Lithium discharge curve.
5
2003 Oct 29
Philips Semiconductors
Product data
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
SA57608
Charging Lithium cells
SA57608 OPERATION
The lithium cells must be charged with a dedicated charging IC such
as the NE57600. These dedicated charging ICs perform a
current-limited, constant-voltage charge, as shown in Figure 4.
The SA57608 continuously monitors the terminal voltage and battery
pack current of a single Li-ion battery pack. Li-ion cells must be
maintained within a set of a very defined operating conditions to
operate safely and with with a long life. If the cell voltage exceeds
the cell’s full-charge voltage, the charge current is interrupted. If the
cell voltage falls below the overdischarge rating of the cell, the
discharge current is interrupted. Also, whenever the discharge
The charger IC begins charging with a current that is typically the
rating of the cell (1C) or the milliampere rating of the cell. As the cell
approaches its full-charge voltage rating (V ), the current entering
the cell decreases, and the charger IC provides a constant voltage.
When the charge current falls below a preset amount, 50 mA for
example, the charge is discontinued.
OV
current exceeds the threshold voltage across the R
two MOSFETs, the short-circuit current is interrupted.
of the
DS(on)
If charging is begun below the overdischarged voltage rating of the
cell, it is important to slowly raise the cell voltage up to this
overdischarged voltage level. This is done by a reconditioning
charge. A small amount of current is provided to the cell (50 mA for
example), and the cell voltage is allowed a period of time to rise to
the overdischarged voltage. If the cell voltage recovers, then a
normal charging sequence can begin. If the cell does not reach the
overdischarged voltage level, then the cell is too damaged to charge
and the charge is discontinued.
V
CC
V
CC
OV
DELAY
CONTROL
CF
OV
UV
C
DLY
V
REF
To take advantage of the larger energy density of lithium cells it is
important to allow enough time to completely charge the cell . When
the charger switches from constant current to constant voltage
charge (Point B, Figure 4) the cell only contains about 80 percent of
its full capacity. When the cell is 100 mV less than its full rated
charge voltage the capacity contained within the cell is 95 percent.
Hence, allowing the cell to slowly complete its charge takes
advantage of the larger capacity of the lithium cells.
GND
V–
CHARGER
DETECTOR
V
CC
UV
DELAY
CONTROL
DF
OC REF
SL01579
Figure 5. SA57608 block diagram.
1.0
Overvoltage condition
When the cell’s terminal voltage exceeds the value of V
,
OV1
measured from V (pin 5) to GND (pin 6), the overvoltage time
CC
0.5
CONSTANT
CURRENT
CONSTANT
VOLTAGE
delay is initiated. After this time has elapsed, the gate of the charge
MOSFET (CF, pin 3) is driven LOW and the charge current is
interrupted. The terminal voltage of the cell may immediately fall due
to the amount of the charge current times the series resistance of
the Li-ion cell (I
again until the cell voltage has fallen below V
is detected across the battery pack terminals. A load is detected
when the VM pin (pin 2) is drawn 0.7 V above the cell’s negative
terminal (GND, pin 6).
× R
). The charge MOSFET will not turn on
ESR
chg
1.0
2.0
, or when a load
OV(rel)
TIME (HOURS)
Vov
The timing capacitor C
the overvoltage threshold (V
(pin 4) provides a time period between
DLY
4.0
) being exceeded and when the
OV1
charge MOSFET is turned off. Its timing period is approximately:
= C (V – 0.7 V) / 0.43 µA (Equation 1)
The variation in timing is approximately ±16 percent.
Point B
t
DLY
DLY
CC
3.0
1.0
2.0
TIME (HOURS)
SL01554
Figure 4. Lithium Cell charging Curves
6
2003 Oct 29
Philips Semiconductors
Product data
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
SA57608
If the battery pack is being charged, and the cell’s voltage exceeds
the overvoltage threshold, then the charge MOSFET is turned OFF
(FET towards the pack’s external terminal). The cell’s voltage must
Undervoltage condition
When the cell voltage falls below the overdischarge threshold,
(V
UV1
), as measured between V (pin 5) and GND (pin 6), the gate
CC
fall lower than the overvoltage hysteresis voltage (V ) before
OV(Hyst)
the charge MOSFET is again turned ON.
of the discharge MOSFET (DF, pin 1) is brought LOW (OFF) after an
internal time delay. The SA57608 then assumes a sleep condition
where its I assumes a very low state (I
) The gate is then
CC
CC(SLP)
If the battery pack is being discharged and the undervoltage
threshold (V ) is exceeded, then the discharge MOSFET is
turned OFF. It will not run back ON until a charger is applied to the
brought HIGH (ON) when a charge current is detected, or when the
VM pin (pin 2) is brought to 0.7 V higher than the negative terminal
of the cell (GND, pin 6) or when the cell voltage is higher than the
UV(Th)
pack’s external terminals and the cell’s voltage rises above the
hysteresis voltage (V
).
UV2
undervoltage hysteresis voltage (V
).
UV(Hyst)
When the battery pack is being discharged, the load current causes
the voltage across the discharge MOSFET to increase past the
Discharge overcurrent condition
If a discharge overcurrent condition is experienced as seen when a
short-circuit is experienced across the battery terminals, the
overcurrent threshold voltage (V
), then the discharge
OC(TH)
MOSFET is turned OFF after a fixed 7–18 ms delay. If short-circuit
is placed across the pack’s terminals, then the discharge MOSFET
is turned OFF after a 100–300 µs time delay to avoid damaging the
MOSFETs.
SA57608 views a high voltage across the MOSFET’s R
. If this
DS(on)
voltage exceeds the threshold voltage (V ), the discharge gate is
SC
brought to a LOW condition (OFF) after an internally set of time
delays are exceeded. If the overcurrent is LOW, then the t
is
SC1
enacted. If the the overcurrent is higher, as experienced in a hard
short-circuit, the time delay is less than 400 ns. This prevents the
MOSFETs from failing from an FBSOA failure.
The R-C filter on the V pin
CC
One needs to place an R-C filters on the V pin. It is to primarily
CC
shield the IC from electrostatic occurrences and spikes on the
terminals of the battery pack. A secondary need is during the
occurrence of a short-circuit across the battery pack terminals. Here,
the Li-ion cell voltage could collapse and cause the IC to enter an
unpowered state. The R-Cs then provide power during the first
instant of the short circuit and allow the IC to turn OFF the discharge
MOSFET. The IC can then enter an unpowered state. Lastly, the
R-C filter filters any noise voltage caused by noisy load current.
The gate of the discharge MOSFET is turned on again only when
the voltage of the VM pin is allowed to fall within the 0.7 volts of the
negative terminal of the cell (GND, Pin 6). If the short-circuit
persists, the gate of the discharge MOSFET is immediately brought
LOW (OFF) again until the short-circuit condition is again removed.
APPLICATION INFORMATION
The typical single-cell lithium-ion or polymer protection circuit based
upon the SA57608 is seen in Figure 6.
The values shown in Figure 6 are good for these purposes.
Selecting the Optimum MOSFETs:
For a single-cell battery pack, a logic-level MOSFET should be
used. These MOSFETs have turn-on thresholds of 0.9 V and are
considered full-ON at 4.5 V VGS. Some problem may be
encountered in not having enough gate voltage to fully turn-ON the
series MOSFETs over the battery pack’s entire operating voltage. If
one deliberately selects an N-Channel MOSFET with a much
V+
100 Ω
5
V
C
CC
0.01 µF
SA57608
0.1 µF
4
6
2
greater current rating, a lower R
attained.
over the entire range can be
DS(on)
VM
DLY
Li-ION
CELL
The MOSFETs should have a voltage rating greater than 20 V and
should have a high avalanche rating to survive any spikes
generated across the battery pack terminals.
GND
DF
CF
3
1
The current rating of the MOSFETs should be greater than four
times the maximum “C-rating” of the cells. The current rating,
though, is more defined by the total series resistance of the battery
pack. The total resistance of the battery pack is given by Equation 2.
1 kΩ
0.1 µF
V–
R
= R
+ R
cell
(Equation 2)
bat(tot)
DS(on)
The total pack resistance is typically determined by the system
requirements. The total pack resistance directly determines how
much voltage droop will occur during pulses in load current.
DISCHARGE
FET
CHARGE
FET
SL01570
Figure 6. Typical protection circuit
Another consideration is the forward-biased safe operating area of
the MOSFET. During a short-circuit, the discharge current can easily
reach 10–15 times the “C-rating” of the cells. The MOSFET must
survive this current prior to the discharge MOSFET can be turned
OFF. So having an FBSOA envelope that exceeds 20 amperes for
5 ms would be safe.
The SA57608 drives the series N-Channel MOSFETs to states
determined by the cell’s voltage and the battery pack load current.
During normal periods of operation, both the discharge and charge
MOSFETs are in the ON state, thus allowing bidirectional current
flow.
7
2003 Oct 29
Philips Semiconductors
Product data
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
SA57608
PACKING METHOD
GUARD
BAND
TAPE
TAPE DETAIL
REEL
ASSEMBLY
COVER TAPE
CARRIER TAPE
BARCODE
LABEL
BOX
SL01305
8
2003 Oct 29
Philips Semiconductors
Product data
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
SA57608
Plastic small outline package; 6 leads; body width 1.8 mm
SOP004
9
2003 Oct 29
Philips Semiconductors
Product data
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
SA57608
REVISION HISTORY
Rev
Date
Description
_1
yyyymmdd
Product data (9397 750 12192). ECN 853-2298 30337 of 09 September 2003.
Supersedes data of 2001 Oct 03 (9397 750 08994).
Modifications:
• Change package outline version to SOP004 in Ordering information table and Package outline sections.
_1
20011003
Product data (9397 750 08994). ECN 853-2298 27198 of 03 October 2001.
Data sheet status
Product
status
Definitions
[1]
Level
Data sheet status
[2] [3]
I
Objective data
Development
This data sheet contains data from the objective specification for product development.
Philips Semiconductors reserves the right to change the specification in any manner without notice.
II
Preliminary data
Qualification
Production
This data sheet contains data from the preliminary specification. Supplementary data will be published
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.
III
Product data
This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).
[1] Please consult the most recently issued data sheet before initiating or completing a design.
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL
http://www.semiconductors.philips.com.
[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
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.
Limitingvaluesdefinition— Limiting values given are in 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 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 — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no
representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support — 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 Semiconductors customers using or selling these products 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 in the products—including circuits, standard cells, and/or software—described
or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated
viaaCustomerProduct/ProcessChangeNotification(CPCN).PhilipsSemiconductorsassumesnoresponsibilityorliabilityfortheuseofanyoftheseproducts,conveys
nolicenseortitleunderanypatent, copyright, ormaskworkrighttotheseproducts, andmakesnorepresentationsorwarrantiesthattheseproductsarefreefrompatent,
copyright, or mask work right infringement, unless otherwise specified.
Koninklijke Philips Electronics N.V. 2003
Contact information
All rights reserved. Printed in U.S.A.
For additional information please visit
http://www.semiconductors.philips.com.
Fax: +31 40 27 24825
Date of release: 10-03
9397 750 12192
For sales offices addresses send e-mail to:
sales.addresses@www.semiconductors.philips.com.
Document order number:
Philips
Semiconductors
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