STEVAL-ISB002V1

STEVAL-ISB002V1 High efficiency step-down controller demonstration board with embedded 2 A LDO regulator based on the ST72F324L Data brief Features ■ 1 % measurement accuracy ■ Firmware easily upgradeable ■ Li-ion battery or 2-cell NiMH batteries ■ 5 V supply ■ RoHS compliant ) s ( ct u d o r P e Description The STEVAL-ISB002V1 is a universal battery charger (UBC) demonstration board based on the ST72F324L microcontroller. The charger used in this demonstration board uses a modified form of a non-inverting buckboost converter to support the charging voltage requirement for single-cell Li-ion batteries. ) (s s b O t e l o STEVAL-ISB002V1 The board includes a 3.3 V power supply generated from a KF33 regulator and a precision reference voltage generated from the TL1431, bearing in mind the accuracy requirement for charging. A status LED is used to show the charging status. t c u d o r P e t e l o This demonstration board is capable of charging single cell Li-ion batteries with in-built NTC or a 2cell NiMH battery from a 5 V supply. The firmware is easily upgradeable and can be modified for other ST7 microcontrollers depending on application requirements. s b O November 2010 Doc ID 18257 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 1 2 3 1 2 E C C R5 470 STT818B B C C Q3 D1 1N5821 2STR1215 Q1 R2 100 3 2 1 330 R1 PWM-1 R6 1k 2 4 5 6 VDD Q2 2STR1215 R4 100 Vsupply 75uH/1000mA L1 Vsupply 3 1 FUSE2 PWM-2 Vout Vin GND GND GND GND NC INHIBIT R13 68 Doc ID 18257 Rev 1 C1 470uF/16V AIN0 4.7k (1%) R18 D4 24 23 22 21 20 19 18 17 AIN14 AIN8 AIN1 AIN0 VDD OSC1 OSC2 GND RESET ICCSEL LED4 LED3 LED2 OSC2 1k R7 V- V+ 3 th Q5 R27 470 AIN8 S1 C5 4.7k R21 33pF C4 33pF Y1 16MHz C3 100nF C10 100nF 100nF C9 100nF C8 C7 10nF 4.7k/NTC RT1 VDD 2STR2215 1 Vin R26 470 BT1 Li-ION BATTERY C2 100nF (Not To Be Mounted) VAREF C6 2.2 uF/16V OSC_EXT V- BT2 Ni-MH BATT ERY R20 5k (0.5%) R19 5k (0.5%) VAREF OSC1 VSS OSC2 AIN8/PF0 VSS PF1 RESET ICCSEL AIN10/PF4 PF6 P A7 ST72F324LK2T6 PF7 P A6 PC0 P A4 U2 1N5821 D2 R17 15k (0.1%) 3 TL1431AIZ R16 4.7k (0.1%) 3PA 7PC 6PC 5PC 4PC 3PC 2PC 1PC VDD 1 2 3 4 5 6 7 8 R15 10k 100 (1%) V DD 0PE 1PE 0PB 3PB 4 PB O PD 1PD PWM-2 R3 V DD 52 PWM-1 VAREF 10k (1%) GND AIN8 Q4 2STF1360 8 7 6 5 Vin k1 R14 1 KF33BDTR VDD 1 2 3 4 U1 IN4148 D3 2 3 F1 8R 32 AIN1 31 AIN0 30 29 28 27 26 TFRON_E (HS)/ 1 2 X1 Q6 AIN14 2 E_FRONT 1 2 3 4 LM258AD 8 7 6 5 J1 Vin OSC_EXT O1 VCC 1O2 1+ 2GND 2+ U3 AIN1 R24 13.32k (0.5%) 2STR1215 0.5,1W(0.5%) R23 R22 3.3k (0.5%) s b O 9 10 11 ICCDAT A 12 AIN14 13 ICCCLK 14 15 16 2 2/4 3 s b O t e l o P e d o r t c u ) (s t R10 R11 R12 LED2 LED3 LED4 r P e u d o 2 4 6 8 10 HEADER 5X2 1 3 5 7 9 CON1 D8 D7 D6 D5 UNIVERSAL_BATT_CHARGER 10k ICCDATA ICCCLK RESET R25 ICCSEL LED LED LED LED 1 Ni-MH BATTERY 2 J3 1 2 Li-ION BATTERY 3 J2 ICC 470 470 470 470 STMicroelectronics Pvt Ltd Plot no. 1, Knowledge Park III, Greater Noida -201308, UP INDIA VDD GND R9 LED1 V+ V- V+ AIN8 V- Circuit schematic 1 Figure 1. 1 2 3 Circuit schematic OSC1 1 LED1 Circuit schematic STEVAL-ISB002V1 ) s ( ct t e l o STEVAL-ISB002V1 2 Revision history Revision history Table 1. Document revision history Date Revision 19-Nov-2010 1 Changes Initial release. ) s ( ct u d o r P e t e l o ) (s s b O t c u d o r P e t e l o s b O Doc ID 18257 Rev 1 3/4 STEVAL-ISB002V1 ) s ( ct Please Read Carefully: u d o Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. r P e All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. t e l o No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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