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INTEGRATED CIRCUITS
NE57606 2 to 4 cell redundant Lithium-ion overcharge monitor
Product data
2002 Oct 10
Philips Semiconductors
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
GENERAL DESCRIPTION
The NE57606 is a redundant overcharge detection IC for use within 2-4 cell Li-ion battery packs. It detects the voltage of each Li-ion cell and issues an overcharge signal which then can be used to alert the portable host or be used to turn-off a series charge MOSFET within the battery pack. Its purpose is to act as a back-up protection circuit to a primary Li-ion protection circuits such as the NE57605 and NE57607. The overcharge signal is an open collector output which can be wire-ORed with other safety functions.
FEATURES
* Consumption current (VCEL = 3.8 V) 3.0 A typical * Consumption current (VCEL = 2.3 V) 0.3 A typical * Input current between cell pins (VCEL = 3.8 V) 0.3 A max * Overcharge detection voltage = threshold voltage 50 mV * Overcharge detection delay time (CT = 0.22 F) 1.5 s typical * Four voltage ranges available
SIMPLIFIED DEVICE DIAGRAM
APPLICATIONS
* Li-ion Battery pack protection
VC4 OV REF VCC VC3 OV REF VC2 OV REF OUT VC1 OV REF 0.7 V GND
CT
SL01558
Voltage options
The device has 4 voltage options. Part Number NE57606Y NE57606C NE57606D NE57606E Detection voltage 4.350 V 4.225 V 4.130 V 4.450 V Hysteresis 250 mV None None 100 mV
2002 Oct 10
2
853-2296 27198
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
ORDERING INFORMATION
TYPE NUMBER NE57606YD NE57606CD NE57606DD NE57606ED PACKAGE NAME SO8 SO8 SO8 SO8 DESCRIPTION Small outline plastic, surface mount 8-pin Small outline plastic, surface mount 8-pin Small outline plastic, surface mount 8-pin Small outline plastic, surface mount 8-pin TEMPERATURE RANGE -20 to +80 C -20 to +80 C -20 to +80 C -20 to +80 C
PIN CONFIGURATION
PIN DESCRIPTION
Pin No Pin Name OUT CT GND VC1 VC2 VC3 VC4 VCC Reset output pin Delay capacitance pin Ground pin Cell 1 power supply Cell 2 power supply Cell 3 power supply Cell 4 power supply Voltage supply to IC Function
OUT CT GND VC1
1 2 3 4
8 7
VCC VC4 VC3 VC2
1 2 3 4 5 6
SL01559
6 5
7 8
MAXIMUM RATINGS
Symbol VCC VC2 VC3 VC4 VC1 VCT VOUT TSTG Tamb Pd VCC input voltage V4 input voltage (Note1) V3 input voltage (Note1) V2 input voltage (Note1) V1 input voltage (Note1) CT pin voltage VOUT pin voltage Storage Temperature Operating temperature Power dissipation Parameter Min -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -40 -20 Max +24 +24 +24 +24 +24 +24 +24 +125 +80 300 C C mW Unit V V V V V
NOTES: 1. VCC = >V4 = > V3 = > V2 = > V1 = > -0.3 2. A current no greater than 100 A should be passed through pin Ct.
2002 Oct 10
3
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
ELECTRICAL CHARACTERISTICS
Tamb = 25C, VCEL = V4-V3 = V3-V2 = V2-V1 = V1-GND, VCC = 4VCEL, except where noted otherwise Symbol I1 I2 I3 VS Parameter Consumption current 1 Consumption current 2 Pin I/O current between cells Overcharge detection voltage VCEL = 3.8 V VCEL = 2.3 V VCEL = 3.8 V (V4, V3, V2, V1 side) VCEL = LH, Ta = -20~+70 C NE57606Y NE57606C NE57606D NE57606E HSY TPLH VOL ILEAK Hysteresis voltage Overcharge detection delay time Output voltage L Output leakage current VCEL = L H L CT = 0.22 F IL = 100 A VCEL = 3.8 V, VOUT = 24 V 4.30 4.175 4.080 4.400 0.20 1.0 4.350 4.225 4.130 4.450 0.25 1.5 4.40 4.174 4.180 4.500 0.30 2.0 0.4 0.1 V S V A V Conditions Min Typ 3.0 0.3 0.0 Max 6.0 0.5 0.3 Units A A A
2002 Oct 10
4
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
TECHNICAL DISCUSSION
The NE57606 is typically used in conjunction with a Li-ion protection IC as redundant protection for a 2, 3, or 4-cell lithium-ion battery pack. Lithium-ion cells can present a safety hazard if they become overcharged, therefore careful monitoring of each cell's operating point is necessary. For very safety-sensitive applications, a back-up protection circuit using a device such as the NE57606 is advisable. The NE57606 monitors each cell within a 2-4 Li-ion cell battery pack. If any cell within the battery pack exceeds the full-charge threshold voltage, the overvoltage fault status output assumes a low state. This output signal should be used to alert other parts of the system that an overcharged state has been reached. This output could also be used to open a MOSFET placed in series with the positive battery terminal to interrupt the charging current from the battery charger. During normal operation of the Li-ion system, the battery charger should be the circuit that terminates the charge. The Lithium-ion protection circuit should never be used for routine termination of the charging function. It should be viewed as a back-up protection system in the event of a charger failure. The redundant overcharge detection IC should disconnect the pack from the charger in the event that both other systems have failed. Setting the trip-point voltages are key to the system's operation. First, the trip point tolerances should not overlap, or the systems will not become active in the proper order over large production. The trip points should be typically set in the following fashion: 1. The battery charger should be set to terminate its charge at a point just below the cell's full charge voltage (-1%) 2. The Li-ion protection circuit is set to open the series charge MOSFET switch at the rated full charge voltage of any of the cell(s). (1%) 3. The redundant overcharge detector is set to issue an alert and/or disconnect a series charge MOSFET switch when any cell voltage exceeds the rated full charge voltage (+1%) With trip-points set as described above, the charger will taper its charging current until the charging current falls below a certain current level, after which the charger turns off. Only if the charger does not or cannot terminate the charging, the protection IC will open a series MOSFET switch, thus cutting off any charge current. Lastly, if both the charger and the protection IC were to fail, the NE57606 will open another series MOSFET.
Redundant Protection of a Lithium-ion Battery Pack
Within a typical Li-ion battery system, there are two or three major circuits responsible for the monitoring and maintenance of the Li-ion cells: the Li-ion battery charger, the Li-ion protection circuit, and sometimes the redundant Li-ion overcharge detector. This type of system is called a triple-redundant protected system. If any one of the protection circuits fail, then there will be two other independent systems to assume the protection function. If the product is designed properly, that is, component de-rating, non-cascading failure modes, ESD, packaging, etc, having two or more simultaneous failures within the protection system is virtually impossible.
2002 Oct 10
5
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
APPLICATION INFORMATION
The NE57606 can be used within 2, 3, or 4-cell battery packs. This can be done by electrically creating a short-circuit across the pins that would have been connected to the ends of the cells. For a 3-cell pack pin VC1 should be connected to ground (pins 3 to 4). All of the combinations are shown in Table 1.
100 0.1 F V+ 8 VCC 7 VC4 0.1 F 1 K
Table 1.
Cells 4-cell 3-cell 2-cell VC1 VC1 VC1 VC1 VC2 VC2 VC1 VC1 VC3 VC3 VC2 VC1 VC4 VC4 VC3 VC2
1 OUT
C4 10 K
VC3
6 0.1 F
C3 10 K
NE57606
VC2 5 0.1 F
The schematics for a 3-cell and a 4-cell monitoring circuit are shown in Figures 1 and 2 respectively.
100 0.1 F V+ 8 VCC 7 VC4 0.1 F
C2
VC1 CDLY GND
4 0.1 F
10 K
1 k 0.22 F C3
C1
2
3
NE57606
VC3 1 OUT 6 0.1 F
V- 10 k OVERVOLTAGE FAULT (OPEN COLLECTOR)
C2 10 k
SL01561
VC2 VC1 4 CDLY GND 2 0.22 F V- OVERVOLTAGE FAULT (OPEN COLLECTOR) 3 5 0.1 F
Figure 2. 4-cell monitoring circuit
C1
SL01560
Figure 1. 3-cell monitoring circuit
2002 Oct 10
6
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
Using the NE57606 within a Li-ion battery system
A Li-ion and Li-polymer 4-cell battery system using the NE57605 and the NE57606 is shown in Figures 3 and 4.
The circuit in Figure 3 shares the charge MOSFET between the ICs. This is sometimes not acceptable since a failure of the charge MOSFET or its associated drive circuitry can disable protection provided by the second circuit.
DISCHARGE FET CHARGE FET V+
100 0.1 F 8 VCC VC4 0.1 F VC3 1 6 0.1 F 5 VC2 0.1 F 4 VC1 CDLY GND 2 0.22 F 3 10 0.1 F C4 10 k C3 1 k 7 1 k 330 330 0.1 F 0.1 F 18 11 VC4 SEL 17 VC3 0.1 F
10 k 47 k 10 k
20 5 VCC DF CS 3 1 CF 910 k
NE57606
OUT
10 k
1 k
16 0.1 F
VC2
NE57605
C2 10 k
1 k
15 0.1 F
VC1 CDLY(UV) CDLY(OV) GND CON CDLY(OC) 8 13 7 9
C1
V- SYSTEM GROUND
SL01562
Figure 3. Shared charge MOSFET
2002 Oct 10
7
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
DISCHARGE FET 100 0.1 F 8 VCC VC4 0.1 F VC3 1 6 0.1 F 5 VC2 0.1 F 4 VC1 CDLY GND 2 0.22 F 3 10 0.1 F C4 10 k C3 1 k 7 1 k 330 330 0.1 F 0.1 F 18 11 VC4 SEL 17 VC3 0.1 F 20 5 VCC DF CS 3 1 CF
CHARGE FET
REDUNDANT CHARGE FET V+ 10 k 10 k
47 k 10 k 10 k
NE57606
OUT
910 k
10 k
1 k
16 0.1 F
VC2
NE57605
910 k
C2 10 k
1 k
15 0.1 F
VC1 CDLY(UV) CDLY(OV) GND CON CDLY(OC) 8 13 7 9
C1
V- SYSTEM GROUND CHARGE SHUTDOWN
SL01862
Figure 4. Double-redundantly protected 4-cell Li-ion battery pack (completely redundant system) The circuit in Figure 4 shows how to implement a completely isolated design. None of the components are shared and a failure in any part of one circuit will not affect the operation of the other. By also not sharing input noise filter components, the failure of the IC due to an input failure or an open circuit will not affect the protection provided by the other circuit.
2002 Oct 10
8
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
PACKING METHOD
GUARD BAND TAPE REEL ASSEMBLY
TAPE DETAIL
COVER TAPE
CARRIER TAPE
BARCODE LABEL
BOX
SL01305
2002 Oct 10
9
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
SO8: plastic small outline package; 8 leads; body width 3.9 mm
pin 1 index
B2 1.73 0.068
4.95 4.80 0.189 0.195 0.51 0.33 0.013 0.020 4.95 4.80 1.27 0.38 0.050 0.015
0.076 0.003
SO8
2002 Oct 10
10
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
REVISION HISTORY
Rev _1 Date 20021010 Description Product data; initial version. Engineering Change Notice 853-2296 27198 (date: 20021003).
2002 Oct 10
11
Philips Semiconductors
Product data
2 to 4 cell redundant Lithium-ion overcharge monitor
NE57606
Purchase of Philips I2C components conveys a license under the Philips' I2C patent to use the components in the I2C system provided the system conforms to the I2C specifications defined by Philips. This specification can be ordered using the code 9398 393 40011.
Data sheet status
Level
I
Data sheet status [1]
Objective data
Product status [2] [3]
Development
Definitions
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. 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. 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).
II
Preliminary data
Qualification
III
Product data
Production
[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. Limiting values definition -- 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 via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
(c) Koninklijke Philips Electronics N.V. 2002 All rights reserved. Printed in U.S.A. Date of release: 10-02
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Document order number:
9397 750 08992
Philips Semiconductors
2002 Oct 10 12

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