ST3S01

ST3S01LED STMICROELECTRONICS | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 17

Technical content

■ DEDICATED I.C. FOR 1 LI-ION CELL OR 3 NI-MH CELLS ■ 5 DIFFERENT OPERATING MODES ■ 150 mA PRECHARGE CURRENT ■ VERY LOW DROP CHARGE SWITCH (130mV @ 800mA) ■ VERY LOW DROP REVERSE SWITCH (130mV @ 800mA) ■ 5.7V OVER BATTERY OVER VOLTAGE PROTECTION ■ CHARGER DETECTION MODE ■ (VCHARGE -VBATT )D E T E C T I O NM O D E

DESCRIPTION

This specification describes a dedicated I.C. which allows to charge 1 Lilon cell or 3 Nimh cells. The principle used to charge the batteries is the pulsed current, the monitoring is operated by the micro-contoller of the application. This IC integrates one Power Switch and achieves the charge batteries in two different modes charge or precharge. One of this operating mode (charge or precharge) can be selected in a static or pulsed way by one I/ O from a micro-controller. The IC can supply power to accessories controlled by this I.C. in Reverse mode. The I.C. is available in the smaller and surface mounted SO-8 (exposed pad version) package. ST3S01LED BATTERY CHARGE I.C. SCHEMATIC DIAGRAM SO-8 exposed pad

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. (*) The I.C. is automatically turned OFF when VCHARGE reaches typically 14V (VCHARGE rising edge); typical hysteresis is 700mV (VCHARGE falling edge) THERMAL DATA ORDERING CODES CONNECTION DIAGRAM (top view) Symbol Parameter Value Unit VBATT Battery Voltage -0.3 to 6 V VCHARGE Charge Voltage (*) -12 to 16 V VFLAG (VCHARGE -V BATT ) Flag Control Voltage -0.3 to 12 V VCHARGER-OK Charger Flag Control Voltage -0.3 to 12 V VCMD-PWM PWM Command Voltage -0.3 to 5 V VCMD-MODE CMD Command Voltage -0.3 to 5 V VCMD-REVERSE Reverse Command Voltage -0.3 to 5 V ISWITCH Internal Switch Continuous Max Current TAMB = 85°C, Rthj-amb= 40°C/W 2A TAMB = 30°C, Rthj-amb= 40°C/W 3A Internal Switch Peak Current T<1ms Duty Cycle < 1% Rthj-amb= 40°C/W Tstg Storage Temperature Range -55 to +125 °C TJ Operating Junction Temperature Range -40 to +125 °C TAMB Operating Ambient Temperature Range (if an adeguate heatsink is provided) -40 to +85 °C Symbol Parameter SO-8 Unit Rthj-case Thermal Resistance Junction-case 10 °C/W TYPE SO-8 exposed pad SO-8 exposed pad (T&R) ST3S01LED ST3S01LED ST3S01LED-TR

Pin N° Symbol Name and Function 1V BATT BATTERY pin: input pin when reverse mode is selected; output pin when in charge or precharge mode

2 CMD-REVERSE Reverse Command pin: Enables the reverse mode when connected to a positive

voltage higher than 1.2V. Logic pin internally pulled down.

3 CMD-PWM PWM Command pin: allows to control the precharge or charge switch in PWM

mode (refer to the Table 1 for the different operating modes). Logic pin internally pulled down.

4 CMD-MODE Mode Command pin: allows to switch between precharge and charge mode (refer

to OPERATING MODES Table). Logic pin internally pulled down.

5 GND GND Pin

6 CHARGER-OK CHARGER-OK output pin; open drain N-channel MOSFET that is in high

CHARGE voltage drops below 2.5V and CMD-REVERSE is low. When the reverse function is activated, this open drain have the same information of the (VCHARGE -VBATT ) FLAG.

7 FLAG FLAG pin (V CHARGE -VBATT ): open drain N-channel MOSFET that sinks current

when the VCHARGE voltage is higher than the VBATT. 8V CHARGE CHARGER SUPPLY pin: input pin when charge or precharge mode is selected; output pin when in reverse mode. CMD-PWM CMD-MODE Operating Function Selected 0 0 PRECHARGE MODE (Default state) 0 1 CHARGE MODE 1 0 CHARGE and PRECHARGE switches are open 1 1 CHARGE and PRECHARGE switches are open

I.C. BLOCK DIAGRAM POSSIBLE OPERATING MODES Five different operating modes are allowed: charge, precharge, reverse, charge+reverse and precharge+reverse. These operating modes can be achieved by properly selection of the CMD-REVERSE CMD-PWM and CMD-MODE (See POSSIBLE OPERATING MODE Table). PRECHARGE MODE The PRECHARGE function is composed by a switch and a 100mA current source which fully works for V CHARGE higher than 2.5V. When the CMD-MODE and the CMD-PWM are not leaded the switch is ON, being the input states held by an internal pull down resistor. This is used when the battery is strongly discharged. In this case V BATT can be null (battery empty) and all the input pins are not held by any level (because the micro-controller is down), except the V CHARGE pin which is a main supply. The source of current supplies a constant current into the battery till its voltage level reaches the required level allowing to start the micro-controller (typically 3V). The current direction is from V CHARGE to VBATT .T h e reverse leakage current when the swich is ON must be null; this is obtained thanks to an internal circuitry that switch OFF the internal P-MOS when the V BATT is higher than VCHARGE ,w h a t e v e rt h e status of the CMD-MODE. The precharge function is also used to adjust the mean current. When the

battery is fully charged the current into the battery has not to be more than C/25 (Nimh battery). In order to perform finely this, the CMD-PWM pin must be driven with PWM function (in the same time, the CMD-MODE must be kept low). The duty cycle allows to adjust the mean current needed. CHARGE MODE T h eC M D - M O D Ep i n ,w h e nh i g h( a n dC M D - P W M low), handles the switch in charge mode. This switch allows the battery charge with a strong current. The drop of this internal P-Channel MOS is very low (200mV @ 800mA) in order to optimize the efficiency of the charge. The switch is not internally protected against short circuit or overcurrent condition. When the switch is ON (CMD-MODE high and CMD-PWM low), the current direction into the chip is from V CHARGE to VBATT . The reverse current when the switch is ON must be null; this is obtained by mean of an internal circuitry that switch OFF the internal P-MOS when the V BATT is higher than VCHARGE , whatever the status of the CMD-MODE. When the CMD-MODE pin is low or in high impedance the switch is OFF, while it is ON when the signal on that pin is high. REVERSE MODE When the reverse function is selected by CDM-REVERSE pin, the switch allows to supply the accessories with a strong current. The drop of the internal P-Channel MOS is very low (200mV @ 800mA) and the switch properly work for V BATT higher than 2.5V. This allows to supply energy on the V CHARGE pin. When the switch is ON (CMD-REVERSE high) the current direction into t h ec h i pi sf r o mV BATT to VCHARGE . The reverse current (from VCHARGE to VBATT ) when the switch is ON must be null; this is obtained by mean of an internal circuitry that switch OFF the internal P-MOS when the V CHARGE is higher than VBATT , whatever the status of the CMD-REVERSE. When the level of CMD-REVERSE pin is low or in high impedance, the switch is OFF, while it is ON when the signal on CMD-REVERSE pin is high. OVERVOLTAGE PROTECTION This function allows to held the switches OFF when the voltage level on V BATT is higher than a maximum voltage whatever are the values of CMD-PWM, CMD-MODE and CMD-REVERSE. This maximum voltage is shown in the electrical characteristic (typical threshold 5.7V). From the moment in which the o.v.protection is activated, it will be possible to turm ON again the switch only when the V CHARGE value decreases down to 2.5V typically, it doesn't matter which operation mode is selected. The protection works only when the battery is in charge or precharge mode, i.e. V CHARGE >V BATT . This represents, in fact, the typical application condition where the battery could increase its value, i.e. When charge or precharge mode are used. CHARGER DETECTION MODE This function allows to generate a digital signal (CHARGER-OK) to indicate if the V CHARGE voltage is higher than 2.5V and the reverse function is inactive. This functionality allows to determine if the charger is present or not; if the V CHARGE is lower than the 2.5V, the CHARGER-OK goes into high impedance (open drain). When the reverse function is active, this open drain have the V CHARGE -VBATT information. This circuitry is directly supplied from VCHARGE pin and works only for VCHARGE higher than 2.2V. VCHARGE -VBATT DETECTION MODE This function allows to generate a digital signal (VCHARGE -VBATT )f l a gt oi n d i c a t ei ft h eVCHARGE voltage is higher than VBATT ;i ft h eVCHARGE is lower than the VBATT , this open drain goes into high impedance state. This circuitry is directly supplied from V CHARGE pin and works only for VCHARGE higher than 2.2V. THERMAL PROTECTION An internal thermal shutdown circuitry will switch OFF the P_MOS, only in precharge or in charge mode, when the junction temperature reaches typically 180°C. This has been implemented in order to protect the device from overburning. 20°C of thermal hysteresis will avoid a thermal oscillation. This circuitry is supplied from V CHARGE and, so, acts only on the precharge and charge switches. ESD PROTECTION Both VCHARGE and V BATT pins are protected against electrostatic discharge up to ±4KV (HBM, MIL STD 833D. CHARGE VOLTAGE V CHARGE functional operating range is from 2.5V t o1 2 V .A tVCHARGE =14V typically the I.C. is automatically turned OFF and remains OFF up to 16V. A VCHARGE voltage higher than 16V can damage the IC.

ELECTRICAL CHARACTERISTICS OF REVERSE SWITCH (TA = -40 to 85°C, unless otherwise specified.) CMD-PWM CMD-MODE CMD-REVERSE Operating Function Selected 0 0 0 PRECHARGE 0 0 1 PRECHARGE + REVERSE 0 1 0 CHARGE 0 1 1 CHARGE + REVERSE 1 0 0 SWITCH OPEN 1 0 1 REVERSE 1 1 0 SWITCH OPEN 1 1 1 REVERSE Symbol Parameter Test Conditions Min. Typ. Max. Unit V BATT Reverse Block Operating Input Voltage 2.5 6 V VDROP Dropout Voltage V BATT =3 V I REVERSE =800mA VCMD-REVERSE =1.9V, VCMD-PWM =1.9V VCMD-MODE =1.9V 130 200 mV ILEAKAGE Reverse Leakage Current (from VCHARGE to VBATT, tested on VBATT pin) VBATT =0 V V CHARGE =9 V VCMD-REVERSE =1.9V, VCMD-PWM =1.9V VCMD-MODE =1.9V 01 µA VIH CMD-REVERSE Logic High (Switch ON) VBATT =3 V I REVERSE =10mA VCMD-PWM =1.9V V CMD-MODE =1.9V 1.2 V VIL CMD-REVERSE Logic Low (Switch OFF) VBATT =3 V I REVERSE =10mA VCMD-PWM =1.9V V CMD-MODE =1.9V 0.4 V VTH CMD-REVERSE Logic Typical Threshold VBATT =3 V I REVERSE =10mA VCMD-PWM =1.9V V CMD-MODE =1.9V 0.75 V ICMD-REV CMD-REV Input Current V BATT =3 V I REVERSE =10mA VCMD-REVERSE =1.9V, VCMD-PWM =1.9V VCMD-MODE =1.9V 1 1.9 3 µA VBATT =5 V I REVERSE =10mA VCMD-REVERSE =1.9V, VCMD-PWM =1.9V VCMD-MODE =1.9V 10 µA tON-OFF Response Time 100 µs

ELECTRICAL CHARACTERISTICS OF PRECHARGE SWITCH (TA = -40 to 85°C, unless otherwise specified.) Symbol Parameter Test Conditions Min. Typ. Max. Unit VCHARGE Precharge Block Operating Input Voltage 2.5 12 V VDROP Dropout Voltage V CHARGE = 2.5V to 9V IPRECHARGE =100mA VCMD-REVERSE =0V or floating VCMD-PWM =0V or floating VCMD-MODE =0V or floating 0.13 1.2 V IPRECHARGE Precharge Current Limit (from VCHARGE to VBATT ) VCHARGE = 2.5V to 5VVBATT =0 V VCMD-REVERSE =0V or floating VCMD-PWM =0V or floating VCMD-MODE =0V or floating 100 170 mA VCHARGE = 2.5V to 9VVBATT =0 V VCMD-REVERSE =0V or floating VCMD-PWM =0V or floating VCMD-MODE =0V or floating 100 200 ILEAKAGE Precharge Leakage Current Limit (from VBATT to VCHARGE , tested on VCHARGE pin) VCHARGE =0 V V BATT = 5.5V VCMD-REVERSE =0V or floating VCMD-PWM =0V or floating VCMD-MODE =0V or floating 1 µA FMODE PRECHARGE Switch Minimum Frequency VCHARGE = 2.5V to 9V VBATT =0 Vt oVCHARGE VCMD-REVERSE =0V or floating VCMD-PWM =0V or floating VCMD-MODE =0V to 1.9V at FMODE 100 Hz tON-OFF Response Time 100 µs tOFF-ON Response Time 100 µs

ELECTRICAL CHARACTERISTICS OF CHARGE SWITCH (TA = -40 to 85°C, unless otherwise specified.) ELECTRICAL CHARACTERISTICS OF CMD-PWM LOGIC PIN (TA =- 4 0t o8 5 ° C ,VCHARGE = 2.5 to 9V unless otherwise specified.) Symbol Parameter Test Conditions Min. Typ. Max. Unit VCHARGE Charge Block Operating Input Voltage 2.5 12 V VDROP Dropout Voltage V CHARGE = 2.5V to 5V ICHARGE =800mA V CMD-REVERSE =0V VCMD-PWM =0V V CMD-MODE =1.9V 0.13 0.2 V ILEAKAGE Precharge Leakage Current Limit (from VBATT to VCHARGE , tested on VCHARGE pin) VCHARGE =0 V V BATT = 5.5V VCMD-REVERSE =0V V CMD-PWM =0V VCMD-MODE =1.9V 1 µA V IH CMD-MODE Logic High (CHARGE MODE ON) VCHARGE = 2.5V to 5V ICHARGE =10mA V CMD-REVERSE =0V VCMD-PWM =0V 1.2 V VIL CMD-MODE Logic Low (CHARGE MODE OFF) VCHARGE = 2.5V to 5V ICHARGE =10mA V CMD-REVERSE =0V VCMD-PWM =0V 0.4 V VTH CMD-MODE Logic Typical Threshold VCHARGE = 2.5V to 5V ICHARGE =10mA V CMD-REVERSE =0V VCMD-PWM =0V 0.75 V ICMD-REV CMD-MODE Input Current VCHARGE =3 Vt o5 V ICHARGE =10mA VCMD-REVERSE =0V V CMD-PWM =0V VCMD-MODE =1.9V 13 0 µA FMODE PRECHARGE Switch Minimum Frequency VCHARGE = 2.5V to 5V ICHARGE =10mA V CMD-REVERSE =0V VCMD-PWM =0V VCMD-MODE =0V to 1.9V at FMODE 100 Hz tON-OFF Response Time 100 µs Symbol Parameter Test Conditions Min. Typ. Max. Unit V IH CMD-PWM Logic High (SWITCH OFF) IPRECHARGE =10mA VCMD-REVERSE =0V V CMD-MODE =0V 1.2 V VIL CMD-PWM Logic High (SWITCH ON) IPRECHARGE =10mA VCMD-REVERSE =0V V CMD-MODE =0V 0.4 V VTH CMD-PWM Logic Typical Threshold IPRECHARGE =10mA VCMD-REVERSE =0V V CMD-MODE =0V 0.75 V ICMD-PWM CMD-PWM Input Current IPRECHARGE =10mA VCMD-REVERSE =0V V CMD-MODE =0V VCMD-MODE =1.9V 13 0 µA

ELECTRICAL CHARACTERISTICS OF CHARGER DETECTION BLOCK (TA = -40 to 85°C, VCHARGE =2 . 2t o9 V ,VCMD-REVERSE = 0V or floating unless otherwise specified.) ELECTRICAL CHARACTERISTICS OF FLAG DETECTION BLOCK (TA =-40 to 85°C, VCHARGE =2 . 2 to 9V unless otherwise specified.) ELECTRICAL CHARACTERISTICS OF OVERLOAD PROTECTION (TA =-40 to 85°C, VCHARGE >3V, VCHARGE >V BATT ,VCMD-REVERSE =0V, VCMD-PWM =0V, VCMD-MODE =0V to 1.9V, unless otherwise specified.) Symbol Parameter Test Conditions Min. Typ. Max. Unit VCHARGE Charger Detection Block Operating Input Voltage 2.2 V VCHARGE-TH Low Voltage Threshold with falling edge 2.425 2.5 2.575 V VCHARGE-HYS Low Voltage Hysteresis with rising edge, TA=25°C 100 mV V CHARGER-OK CHARGER-OK Output Voltage Low VCHARGE =3 V I CHARGER-OK =1mA 0.2 0.4 V V CHARGER-OK CHARGER-OK Output Voltage Low VFLAG = 0.2V I CHARGER-OK =1mA VCMD-REVERSE =1.9V 0.2 0.4 V ICHARGER-OK CHARGER-OK Output Leakage Current VCHARGE = 2.2V V CHARGER-OK =10V 0 1 µA ICHARGER-OK CHARGER-OK Output Leakage Current VFLAG = 0.2V V CHARGER-OK =10V VCMD-REVERSE =1.9V 01 µA Symbol Parameter Test Conditions Min. Typ. Max. Unit VCHARGE FLAG Detection Block Operating Input Voltage 2.2 V VVCHARGE- VBATT FLAG (VCHARGE -V BATT ) Voltage Low VFLAG = 0.2V I FLAG =1mA 0.2 0.45 V IVCHARGE- VBATT FLAG (VCHARGE -V BATT ) Leakage Current VFLAG = 0.2V I FLAG =10mA 1 µA VVCHARGE- VBATT FLAG* (VCHARGE -VBATT ) Voltage Low ICHARGE =20mA I FLAG =1mA 0.2 0.45 V IVCHARGE- VBATT FLAG* (VCHARGE -VBATT ) Leakage Current VBATT =V CHARGE VFLAG = 10V 1 µA * Guaranteed by design Symbol Parameter Test Conditions Min. Typ. Max. Unit VBATT Battery Input Threshold with rising edge 5.4 5.6 5.9 V tON-OFF Response Time Switches ON to OFF, T A = 25°C 100 µs

Figure 21 :Dynamic Precharge Mode

DIM. mm. inch A 1.25 1.62 0.049 0.064 a1 0 0.10 0.000 0.004 a2 1.10 1.65 0.043 0.064 a3 0.65 0.85 0.025 0.033 b 0.33 0.51 0.013 0.020 b1 0.19 0.25 0.007 0.010 C 0.25 0.50 0.010 0.019 c1 45˚ (max.) D 4.80 5.00 0.189 0.196 E 5.80 6.20 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F 3.80 4.00 0.149 0.157 L 0.40 1.27 0.016 0.050 M 0.6 0.023 S ˚ (max.) SO-8 (exposed pad) MECHANICAL DATA BA A B0,10

DIM. mm. inch A 330 12.992 C 12.8 13.2 0.504 0.519 D 20.2 0.795 N 60 2.362 T 22.4 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 Tape & Reel SO-8 MECHANICAL DATA

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. © The ST logo is a registered trademark of STMicroelectronics © 2003 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. © http://www.st.com