INTEGRATED CIRCUITS DATA SHEET SAA1502ATS Safety IC for Li-ion Preliminary specification File under Integrated Circuits, IC11 1998 Jan 15 Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS FEATURES GENERAL DESCRIPTION • Integrated power switches The SAA1502ATS is manufactured in a Bipolar, CMOS and DMOS (BCD) Power Logic 70 process and is intended to be used as a protection circuit for single cell Li-ion battery packs. The current and voltage ratings are especially designed for use in battery packs for portable telephones such as GSM. The circuit monitors the battery voltage, current and temperature and will disconnect the battery in case of an overload situation: • Temperature protection • Zero voltage start-up • Discharge and charge overcurrent protection • Automatic release of current protection at removal of charger or load • Extremely low current consumption when battery voltage is lower than 2.3 V • Accurate voltage detection levels • Overdischarge protection prevents deep discharge of the cell; deep discharge of a Li-ion cell degrades the lifetime • Low resistance in current path • Overcharge protection for safety reasons • Able to accommodate 17.5 V charge voltage • Overcurrent protection on charge as well as discharge current rate • Low current consumption in normal operation mode • Read out of charge disable status • Temperature protection for preventing charge or discharge at high temperatures. • Small package (SSOP16) • Low external components count • Continuous monitoring of the battery voltage and (dis)charge current. It must be stated that the unit is a safety unit to be integrated inside a battery pack. It is not intended as an end of charge provision. ORDERING INFORMATION TYPE NUMBER SAA1502ATS 1998 Jan 15 PACKAGE NAME SSOP16 DESCRIPTION plastic shrink small outline package; 16 leads; body width 5.3 mm 2 VERSION SOT338-1 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... n.c. 3 15 VM VCC Vref 2 ESD VSS1 VSS2 SAA1502ATS LEVEL SHIFTER 1, 16 set temperature protection 4.18 V charge disable 3.95 V charge enable reset temperature protection CHARGE PUMP 6.8 V 3.6 V discharge enable 2.3 V discharge disable Vref Vcp LEVEL SHIFTER 14 5, 6 Vref Philips Semiconductors ST Safety IC for Li-ion BLOCK DIAGRAM dbook, full pagewidth 1998 Jan 15 Cext LOGIC 3 LF 4, 13 ESD Vref SW2 Vd CURRENT PROTECTION 7, 8, 9, 10 ESD ESD Vref Vref SW1 11, 12 Fig.1 Block diagram. SAA1502ATS MGM307 Preliminary specification VM Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS PINNING SYMBOL PIN DESCRIPTION n.c. 1, 16 VCC 2 positive battery sense input Cext 3 external delay capacitor LF 4, 13 leadframe connection control circuit VSS2 5, 6 negative battery input and power ground not connected Vd 7, 8, 9, 10 VM 11, 12 VSS1 14 ground for the control circuit ST 15 status output handbook, halfpage n.c. 1 16 n.c. VCC 2 15 ST Cext 3 14 VSS1 LF 4 VSS2 5 drain voltage of SW1 and SW2 negative sense input 13 LF SAA1502ATS 12 VM VSS2 6 11 VM Vd 7 10 Vd Vd 8 9 Vd MGM308 Fig.2 Pin configuration. unless the battery voltage exceeds the voltage restarting level of 3.6 V. FUNCTIONAL DESCRIPTION Figure 3 gives the connection diagram of a Li-ion battery pack. All that is contained within the solid perimeter is the safety IC SAA1502ATS. It is a Multichip Module (MCM), containing two separate but interconnected chips, one is the control IC and the other contains two vertical power NMOS transistors which are connected in anti series. Both transistors have their backgate connected to their source, resulting in two backgate diodes in anti series. The basic function of the SAA1502ATS is to protect a single Li-ion cell against overcharge and overdischarge for reasons of lifetime and safety. The voltage across the cell terminals is monitored continuously and compared to an accurate internal reference voltage. For battery voltages between 3.6 and 4.18 V and a (dis)charge current below the current protection level, the safety unit is in normal operating mode (see Fig.4). In this state both switches are driven with an elevated supply voltage (with a charge pump) which guarantees a low resistance in the main current path. This is important for fully utilizing the high energy density of Li-ion battery technology. When no charger is present in the discharge inhibit mode, the system will switch to the Power-down mode. The current consumption of the unit (SAA1502ATS and the Li-ion cell) is then reduced to a typical value of 0.1 µA for minimizing the discharge of the battery pack. Connecting a charger in the Power-down mode is detected by a voltage difference between VCC and VM of more than 3 V. The system will then return to the discharge inhibit mode. After a short transition phase characterized by conduction of the backgate diode between the drain and source leads of SW2, the system goes to the normal operating mode and SW2 is powered again. At zero voltage start-up, the system will start at the reset mode. A special circuit keeps the charge transistor SW1 on as much as possible. When the battery is charged to a voltage level of 4.18 V it will enter the charge inhibit mode and the charge PowerMOS transistor SW1 is switched off, disabling charging. Connecting a load is then detected by the reversal of the voltage across SW1 (Idch > 1.5 mA) and will immediately reactivate SW1, entering the discharge enable state. The discharge PowerMOS transistor SW2 is disabled to block further discharge, when the battery is discharged below 2.3 V. The battery voltage will increase stepwise, because of the sudden disconnection of the load. The unit will not re-enter the normal operation mode at this event 1998 Jan 15 4 Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS A short time is needed to charge the gate of SW1. During this time the backgate diode between drain and source of SW1 conducts. is charged at a voltage below 2.3 V, an extra condition of Vbat > 2.3 V is included going from the discharge inhibit to the normal operation mode. The system will remain in the discharge enable mode unless: Power-down mode At low battery voltage the supply current is reduced to 100 nA for minimizing the discharge of the battery by the SAA1502ATS. • The battery voltage drops below 3.95 V, which results in re-entering normal operation. This transition is not externally noticeable, because both switches remain low ohmic. At the Power-down mode all analog circuitry, except circuitry for detecting a charger present (VCC − VVM > 3 V), is disabled. The Power-down mode is entered when the system is in the discharge inhibit mode and no charger is present. The discharge inhibit mode will be entered again as soon as a charger is connected. • A charger is connected which will immediately deactivate SW1 if Ich > 280 mA. As an additional safety precaution also VCC > 4.18 V yields the same reaction, because a small current of a charger may be undetected with the condition of Ich > 280 mA, leading to overcharging the Li-ion cell. The detection of a charger is accomplished by detecting a voltage difference of 3 V between VCC and VM. In this mode the voltage difference (see Fig.5) is: VCC − VVM = Vbat − VR1 + Vj(DO) + Vds(CO) ≈ Vbat + 0.6 V. Current protection will deactivate both switches and is detected by a voltage drop or rise of VVM when both switches are activated. A release of this state can only be achieved by removing the load (or charger). So in the application the battery has to be charged in the Power-down mode until such a voltage that VCC − VVM = 3 V. The temperature protection overrules all other states and yields deactivation of both switches. This situation is activated at a junction temperature of 130 °C and released at a junction temperature of 60 °C. The temperature protection is followed by a return to its preceding mode. Reset mode If the battery voltage is below 1.9 V, the system will be in the reset mode. Because in this mode the charge pump is disabled and battery charging should be possible, the charge FET is switched on with a reduced Vgs voltage. Normal mode In case of correct temperature, battery voltage and (dis)charge current, the system will be in the normal operation mode. Both the charge and discharge output will be active high, so both switches are conducting (SW1 = SW2 = 1). As soon as the battery voltage exceeds 2.25 V the system will switch to the discharge inhibit mode and the charge pump will be activated again. Zero voltage start-up Discharge inhibit mode The system has to be able to charge the battery at ‘0 Volt’. This means that when connecting a charger in case of a complete empty battery, the charge FET has to be active. In the reset mode the charge FET (SW1) is connected via a diode to VCC, so that the charge FET will be active when the VVM voltage is negative. The discharge inhibit mode will be entered as soon as a battery voltage exceeds 2.25 V. If the battery drops below 2.3 V, the system will switch to the discharge inhibit mode. In this mode only charging of the battery is allowed (SW1 = 1, SW2 = 0). The system will return to the normal operation mode as soon as the battery voltage will exceed 3.6 V, or by detection of a charge current. The overdischarge detection of 2.3 V has a delay of 40 ms typical. The voltage detection level 3.6 V has a delay of 50 ms typical. Because a charge current is necessary to increase the battery voltage, the system will normally switch to the normal operation mode at VCC = 2.3 V by detecting a charge current. But if the charge current is too small to detect, the 3.6 V detection is a backup. Charge inhibit mode If the battery voltage exceeds 4.18 V, the charge inhibit mode will be entered. At this mode the battery can only be discharged (SW1 = 0, SW2 = 1). The overcharge detection has a delay of 40 ms. This delay can be increased by an external capacitor. The delay time is then To prevent an instable situation between the normal operation and the discharge inhibit mode when the battery 1998 Jan 15 5 Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS defined as: td = 40 + (37 × Cext) [ms], with Cext in nF. Temperature protection Internally the system will switch between the different modes as given in the state diagram, independent of the temperature. As the junction temperature exceeds 130 °C, the output signals will be overruled and switched to zero (SW1 = SW2 = 0). The system will return to the normal operation mode from the charge inhibit mode when the battery voltage drops below 3.95 V. From the discharge enable mode the charge inhibit mode will also be entered as soon as a charge current is detected. The supply current will be reduced to approximately 100 nA when the Power-down or reset mode is activated. In these modes the temperature protection is deactivated. Discharge enable mode When the junction temperature drops below 60 °C, the output signals will not be overruled any more. When the system is in the charge inhibit mode, charging of the battery is disabled because switch SW1 is turned off. Discharge of the battery will then occur via the backgate diode of SW1. So the output voltage will be approximately 0.6 V lower and also dissipation of the backgate diode of SW1 occurs. It would be preferable to turn both switches on at that time without allowing charging of the battery until the battery voltage has dropped to 3.95 V. Overcurrent protection When the (dis)charge current exceeds the specified maximum value, the current protection mode is entered. An extra condition of SW1 = SW2 = 1 is necessary because of the next situation: If a discharge current larger than 1.5 mA is detected in the charge inhibit mode, the system will activate the discharge enable mode, activating both switches. From the discharge enable mode the charge inhibit mode will be re-entered as soon as a charge current is detected larger than 280 mA or the battery voltage exceeds 4.18 V. If the system is in the discharge inhibit and a charge current is detected (e.g. VVM = −0.6 V) the normal operation mode will be entered. Because of a minimum time in which the gate capacitors have to be charged, the VVM voltage will be −0.6 V for a short period, when the system is already in the normal operation mode. A VVM voltage of −0.6 V could also occur when the system is charged with current exceeding the maximum charge current. To prevent that a maximum charge current is detected when coming from the discharge inhibit state, the system waits until both SW1 and SW2 are fully charged before a maximum (dis)charge current is detected. The detection of a higher voltage than 4.18 V is a backup. If the battery is charged with a lower charge current than 280 mA, the system will not switch from the discharge enable mode to the charge inhibit mode. Eventually, if the battery is overcharged because of a small charge current, the battery voltage will exceed 4.18 V and the system will switch to the charge inhibit mode. So the voltages at SW1 and SW2 are measured to be sure that the normal operation mode is stabilized before the current protection mode can be entered. The system will return to the normal operation mode from the discharge enable mode when the battery voltage drops below 3.95 V. The same applies when entering the discharge enable state from the charge inhibit state by detecting a discharge current. If the system is in the charge inhibit mode, it will mostly go to the normal mode via the discharge enable mode. But if the system is in the charge inhibit state and the system is stored for several years, the battery voltage can drop because of the battery discharge by the SAA1502ATS and the self-discharge of the battery. So a voltage drop of the battery is possible, without detecting a discharge current. Because of this, the normal operation mode should also be entered from the charge inhibit state when the battery voltage is below 3.95 V and not only from the discharge enable mode. In this way, charging a battery is always possible if the battery voltage is below 3.95 V. 1998 Jan 15 The delay of the current protection as function of the (dis)charge current is given in Fig.8. 6 Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS handbook, full pagewidth Cext 3 charger/load 1 kΩ VCC 0.22 µF 2 CONTROL CIRCUIT VSS1 14 DO Vbat CO VM SW1 SW2 VSS2 5, 6 SAA1502ATS 7, 8, 9, 10 11, 12 15 Vd VM ST charger/load MGM309 Fig.3 Connection diagram. handbook, full pagewidth current protection SW1, SW2 Idch or Ich > Iprot no charger/load VCC > 4.18 V or Ich > 280 mA discharge enable SW1, SW2 Idch > 1.5 mA charge inhibit SW1, SW2 VCC > 4.18 V VCC < 3.95 V VCC < 3.95 V current protection SW1, SW2 Idch or Ich > Iprot no charger/load normal operation SW1, SW2 VCC < 2.3 V VCC > 3.6 V or (Ich > 1.5 mA and VCC > 2.3 V) from all states (except from power down and reset) Tstart(prot) ≥ 130 °C Fig.4 Flow diagram. 7 power down SW1, SW2 charger present VCC > 2.25 V from all states temperature protection SW1, SW2 1998 Jan 15 discharge inhibit SW1, SW2 back to previous state Trel(prot) < 60 °C no charger present VCC < 1.9 V reset SW1, SW2 MGM310 Philips Semiconductors Preliminary specification Safety IC for Li-ion handbook, full pagewidth SAA1502ATS Vbat R1 + Vbat − CHARGER VCC C1 CONTROL CIRCUIT s + Vj(DO) g DO CO SW2 − d + Vds(CO) − d SW1 s g MGM311 VM Fig.5 Circuit diagram of charging a Li-ion pack. 1998 Jan 15 8 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... Philips Semiconductors Preliminary specification SAA1502ATS load present charger present load present no charger; no load no charger; no load no charger; no load charger present load present no charger; no load charger present Ich > Iprot charger present no charger; no load charger present no charger; no load Idch > Iprot load present load present no charger; no load MGM315 Safety IC for Li-ion 4.18 3.95 TIMING DIAGRAM normal operation discharge enable current protection discharge enable charge inhibit normal operation current protection via discharge inhibit to normal operation to power down dbook, full viapagewidth discharge inhibit normal operation discharge enable charge inhibit discharge enable SW2 on 9 Fig.6 Timing diagram. tec(rel) td tec(det) td ted(det) tec(rel) tec(det) charge inhibit normal operation reset discharge inhibit 1998 Jan 15 Vbat 3.6 2.3 2.25 SW1 on off off VM Vbat +Vdiode −Vdiode 0 Vbat − Vcharger Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134); voltages with respect to pin VSS2. SYMBOL PARAMETER CONDITIONS VCC positive battery sense input voltage DC constant t < 60 ms and ICC = 7 mA MIN. −0.3 MAX. UNIT +4.5 V VCC(clamp) VCC clamping voltage − 8.5 V ICC maximum current through the VCC clamp − 7 mA VVM negative sense input voltage VCC − 17.5 VCC V VST status output voltage VVM VCC V IRpath current through SW1 and SW2 − 27 A Tamb operating ambient temperature −25 +80 °C Tstg storage temperature −55 +150 °C IVSS−VM maximum body diode current (DC value) − 800 mA THERMAL CHARACTERISTICS SYMBOL PARAMETER Rth(j-a) thermal resistance from junction to ambient Rth(j-pin) thermal resistance from junction to pin 1998 Jan 15 CONDITIONS in free air 10 VALUE UNIT 165 K/W 22 K/W Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS CHARACTERISTICS Tj = 25 °C; all voltages with respect to VSS2; positive currents flow into the IC. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supply behaviour VCC positive battery sense input voltage 0 − 4.5 V ICC supply current VCC = 4.0 V; −13.5 V ≤ VVM ≤ 0 4.0 7.0 10 µA Iq quiescent current Power-down/reset mode (VCC = 2.0 V) 0.03 0.1 0.3 µA VCC−VVM minimum charge voltage at zero charge 1.8 2.4 3.0 V measured at terminals of the battery and Tj = 25 °C 4.15 4.18 4.20 V measured at terminals of the battery and Tj = −5 to +55 °C 4.145 4.18 4.21 V Cext not connected 20 40 60 ms Cext = 33 nF (±10%) 0.5 1.25 2 s Voltage detection Vec(det) tec(det) excess charge detection voltage excess charge delay time Vec(det) Vec(rel) excess charge release voltage 3.82 3.95 4.08 V tec(rel) excess charge delay time Vec(rel) 25 50 75 ms Ved(det) excess discharge detection voltage 2.2 2.3 2.4 V ted(det) excess discharge delay time Ved(det) 20 40 60 ms Ved(rel) excess discharge release voltage 3.3 3.6 3.9 V ted(rel) excess discharge delay time Ved(rel) IVSS−VM (dis)charge current detection VVM negative sense input voltage 25 50 75 ms charge inhibit state 0.05 1.5 37.5 mA discharge enable state 150 280 475 mA discharge inhibit state 0.05 1.5 37.5 mA discharge inhibit state; no charge current −7 −12 −20 mV current protection mode no load detection 70 90 120 mV no charger detection −7 −12 −20 mV VCC−VVM charge present detection voltage Power-down mode 2.4 3.0 3.6 V VCC positive battery sense input voltage start of reset mode 1.7 1.9 2.1 V excess of reset mode 2.05 2.25 2.45 V td(on) switch-on delay time SW1/SW2 VCC = 4.0 V − 100 − µs td(off) switch-off delay time SW1/SW2 VCC = 4.0 V − 100 − µs 1998 Jan 15 11 Philips Semiconductors Preliminary specification Safety IC for Li-ion SYMBOL SAA1502ATS PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Power transistors main current path resistance Rpath VCC = 2.5 V; IVSS−VM = 2 A 52 66 80 mΩ VCC = 4.0 V; IVSS−VM = 2 A 48 60 72 mΩ VCC = 2.5 V; IVSS−VM = 2 A 26 33 40 mΩ VCC = 4.0 V; IVSS−VM = 2 A 24 30 36 mΩ VCC = 2.5 V; IVSS−VM = 2 A 26 33 40 mΩ VCC = 4.0 V; IVSS−VM = 2 A 24 30 36 mΩ SW1 transistor Rpath(SW1) current path resistance SW2 transistor Rpath(SW2) current path resistance Temperature protection Tstart(prot) start of the temperature protection 120 130 140 °C Trel(prot) release of the temperature protection 50 60 70 °C 3.5 5 7 A Current detection at VCC = 4 V; see Fig.8 Iprot(min) minimum current protection level DC level td delay time at Iprot = 8 A 2 20 200 ms td(min) minimum delay time 190 − 430 µs ST = 1; VCC − VVM = 17.5 V; VST − VVM = 0.5 V 40 − 200 µA ST = 1; VCC − VVM = 4 V; VST − VVM = 0.5 V 10 − 100 µA ST = 1; IST = 40 µA; VCC − VVM = 17.5 V − − 0.5 V ST = 1; IST = 10 µA; VCC − VVM = 4 V − − 0.5 V Status; see Table 1 and Fig.7 IST output current VST Table 1 output voltage Functional table of the status output (ST); note 1 CONDITIONS Normal operation OUTPUT 0 Charge inhibit 1 Discharge enable 0 Discharge inhibit 0 Power-down 0 Current protection 1 Temperature protection 1 Note 1. At which: ‘0’ is active off, and ‘1’ is active on. 1998 Jan 15 12 Philips Semiconductors Preliminary specification Safety IC for Li-ion handbook, full pagewidth SAA1502ATS MGM313 VST − VVM (V) VCC − VVM = 4 V VCC − VVM = 17.5 V 0.5 10 40 IST (µA) Fig.7 Status output current at different charge voltages. MGM312 102 handbook, halfpage td (s) 10 1 10−1 max 10−2 10−3 typ 10−4 25 15 max min 5 min 0 Ich (A) 5 typ 15 25 Idch (A) Fig.8 Current protection delay. 1998 Jan 15 13 Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS APPLICATION INFORMATION handbook, full pagewidth (charger/load) + B+ R1 1 kΩ n.c. VCC VCC C1 1 µF Cext C2 33 nF Li-ion LF VSS2 VSS2 Vd Vd B− 1 16 2 15 3 14 4 13 SAA1502ATS 5 12 6 11 7 10 8 9 C4 100 nF R2 10 MΩ n.c. ST ST VSS1 C3 100 nF VSS1 LF VM VM Vd Vd B−' (sense) − VM (sense) (charger/load) MGM314 Fig.9 Connection diagram application board. 30 handbook, full pagewidth 1 PHILIPS C3 C4 R2 R1 6 C2 C1 B+ PHILIPS + ST VSS1 SAA1502 − VM B −' B− VCC MGM316 Dimensions in mm. Fig.10 Application printed-circuit board. 1998 Jan 15 14 Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS PACKAGE OUTLINE SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm D SOT338-1 E A X c y HE v M A Z 9 16 Q A2 A (A 3) A1 pin 1 index θ Lp L 8 1 detail X w M bp e 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y Z (1) θ mm 2.0 0.21 0.05 1.80 1.65 0.25 0.38 0.25 0.20 0.09 6.4 6.0 5.4 5.2 0.65 7.9 7.6 1.25 1.03 0.63 0.9 0.7 0.2 0.13 0.1 1.00 0.55 8 0o Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT338-1 1998 Jan 15 REFERENCES IEC JEDEC EIAJ EUROPEAN PROJECTION ISSUE DATE 94-01-14 95-02-04 MO-150AC 15 o Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS If wave soldering cannot be avoided, the following conditions must be observed: SOLDERING Introduction • A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. 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. • The longitudinal axis of the package footprint must be parallel to the solder flow and must incorporate solder thieves at the downstream end. Even with these conditions, only consider wave soldering SSOP packages that have a body width of 4.4 mm, that is SSOP16 (SOT369-1) or SSOP20 (SOT266-1). 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). 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. Reflow soldering Reflow soldering techniques are suitable for all SSOP 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. 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. 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. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. Repairing soldered joints Fix the component by first soldering two diagonallyopposite 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. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 °C. Wave soldering Wave soldering is not recommended for SSOP packages. This is because of the likelihood of solder bridging due to closely-spaced leads and the possibility of incomplete solder penetration in multi-lead devices. 1998 Jan 15 16 Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification 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. 1998 Jan 15 17 Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS NOTES 1998 Jan 15 18 Philips Semiconductors Preliminary specification Safety IC for Li-ion SAA1502ATS NOTES 1998 Jan 15 19 Philips Semiconductors – a worldwide company Argentina: see South America Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. +61 2 9805 4455, Fax. +61 2 9805 4466 Austria: Computerstr. 6, A-1101 WIEN, P.O. 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VB, Tel. +31 40 27 82785, Fax. +31 40 27 88399 New Zealand: 2 Wagener Place, C.P.O. Box 1041, AUCKLAND, Tel. +64 9 849 4160, Fax. +64 9 849 7811 Norway: Box 1, Manglerud 0612, OSLO, Tel. +47 22 74 8000, Fax. +47 22 74 8341 Philippines: Philips Semiconductors Philippines Inc., 106 Valero St. Salcedo Village, P.O. Box 2108 MCC, MAKATI, Metro MANILA, Tel. +63 2 816 6380, Fax. +63 2 817 3474 Poland: Ul. Lukiska 10, PL 04-123 WARSZAWA, Tel. +48 22 612 2831, Fax. +48 22 612 2327 Portugal: see Spain Romania: see Italy Russia: Philips Russia, Ul. Usatcheva 35A, 119048 MOSCOW, Tel. +7 095 755 6918, Fax. +7 095 755 6919 Singapore: Lorong 1, Toa Payoh, SINGAPORE 1231, Tel. +65 350 2538, Fax. +65 251 6500 Slovakia: see Austria Slovenia: see Italy South Africa: S.A. PHILIPS Pty Ltd., 195-215 Main Road Martindale, 2092 JOHANNESBURG, P.O. Box 7430 Johannesburg 2000, Tel. +27 11 470 5911, Fax. +27 11 470 5494 South America: Al. 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No. 5, 80640 GÜLTEPE/ISTANBUL, Tel. +90 212 279 2770, Fax. +90 212 282 6707 Ukraine: PHILIPS UKRAINE, 4 Patrice Lumumba str., Building B, Floor 7, 252042 KIEV, Tel. +380 44 264 2776, Fax. +380 44 268 0461 United Kingdom: Philips Semiconductors Ltd., 276 Bath Road, Hayes, MIDDLESEX UB3 5BX, Tel. +44 181 730 5000, Fax. +44 181 754 8421 United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409, Tel. +1 800 234 7381 Uruguay: see South America Vietnam: see Singapore Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD, Tel. +381 11 625 344, Fax.+381 11 635 777 For all other countries apply to: Philips Semiconductors, International Marketing & Sales Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825 Internet: http://www.semiconductors.philips.com © Philips Electronics N.V. 1998 SCA57 All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. 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. Printed in The Netherlands 297027/1200/01/pp20 Date of release: 1998 Jan 15 Document order number: 9397 750 02706