IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER DESCRIPTION RECOMMENDED EQUIPMENT The IS31BL3233A is the ideal solution for high-power flash LEDs used in cell phone camera or digital still camera applications. It is a highly integrated step up DC-DC converter with a 2MHz switching frequency, enabling a small total space solution for portable photo flash. The IS31BL3233A has separate Flash Mode and Torch Mode enable pins for maximum flexibility. The Flash Mode and Torch Mode LED currents are programmed by external resistors respectively, making the flash LED solution simple to control. If both enable pins are at logic high, the LED current will be programmed by the Torch Mode setting resistor. The two LED output sinks can be shorted together externally for higher power single flash LEDs, up to 1.5A continuous LED current. Thermal regulation is integrated in Flash Mode to limit the IC’s temperature and continuously provide the maximum allowed output current. ABSOLUTE MAXIMUM RATINGS Input voltage range: 2.7V~5.5V Dual flash LED outputs Drive up to total 1.5A or 0.75A per channel 1s time out in Flash Mode to protect LED High efficiency up to 93% (1A, Flash Mode) Independent Flash Mode enable and Torch Mode enable pins Torch Mode dimming via PWM control Integrated thermal regulation control LED open/short protection Over-voltage protection Cycle-by-cycle inductor current limit Pb-free package: DFN-14 (2mm × 3mm) ≤ 5.5V power supply Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. PROCEDURE The IS31BL3233A evaluation board is fully assembled and tested. Follow the steps listed below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) FEATURES 2.7V~5.5V, 2A power supply 2) 3) Connect the ground terminal of the power supply to the GND and the positive terminal to the VCC. Or connect the DC power to the connector (DC IN). Turn on the power supply and pay attention to the supply current. If the current exceeds 2A, please check for circuit fault. Press Torch (K2) or Flash lamp (K1) button to enable the respective function. EVALUATION BOARD OPERATION The evaluation board is controlled by LPC922 (8051 core). IS31BL3233A evaluation board demonstrates the Flash and Torch modes by switching between modes when the corresponding buttons are pressed. 1) QUICK START Torch Mode: The “Bright+” (K3) and “Bright-” (K4) buttons are used to control the WLED brightness. There are five selectable levels, the LEDs on the left graphically show the brightness level. The default power on level is D1, the lowest level. The “Torch” button is used to Enable/Disable this mode. 2) Flash Mode: Once pressed the white LEDs will flash ON for one second. External Support: Jumper JP1 is closed (default). Remove the jumper on JP1 (on board LPC922 MCU disabled) if you want to use an external MCU control. Connect the external MCU I/O signals to the TP4 connector to directly control the IC’s ENF and ENM input pins. (VIL <0.4V, VIH >1.4V for ENF and ENM) SOFTWARE SUPPORT Figure 1: Photo of IS31BL3233A Evaluation Board Please refer to the integrated program. Please refer to the datasheet to get more information about IS31BL3233A. Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014 1 IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER ORDERING INFORMATION Part No. Temperature Range Package IS31BL3233A-DLS2-EB -40°C ~ +85°C (Industrial) DFN-14, Lead-free Table1: Ordering Information For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at [email protected] or (408) 969-6600. VCC U3 L1 1uH CON1 DC IN VCC 5 6 4 C11 C10 10uF C9 10uF C7 0.1uF LX LX VIN VOUT VOUT VOUT 9 8 C8 2.2uF C12 2.2uF 0.1uF D7 D6 ENM 11 ENF 10 VCC D1 D2 D3 D4 D2 D1 D5 7 13 3 R1 2.4K R2 2.4K R3 2.4K RSETF RSETM 2 1 RSETF 13K RSETM 68K IS31BL3233A LED5 JP1 OPEN=EXT CTRL VCC PGND AGND AGND VOUT VCCLDO VOUT 2 C3 1uF C4 0.1uF 3V ENF 4 1 2 GND 3 LDO 3V 6 7 R6 4.7K K2 Bright- K3 R9 4.7K KEY4 Torch R8 4.7K KEY3 K1 KEY2 KEY1 Flash lamp R7 4.7K VCC U2 C2 10nF BP TP3 5 SD VOUT 2 1 3V VDD 3 D9 D8 14 12 U1 1 C1 1uF R5 2.4K LED4 LED3 LED2 LED1 VCCLDO R4 2.4K ENM ENF Bright+ 10 KEY1 9 KEY2 8 KEY3 19 ENM 20 K4 P0.0 VDD P1.7 P1.5 P1.6 P0.3 P3.1 P0.4 P3.0 P0.5 P1.2 P0.6 P1.3 P0.7 P1.4 P1.0 P0.2 P1.1 P0.1 VSS 15 R10 NC 4 RST R11 NC TP4 18 KEY4 2 1 17 ENM ENF 16 LED1 R15 100K 14 LED2 R14 100K 13 LED3 12 LED4 11 LED5 5 3V P0.5 P0.4 RST GND 5 4 3 2 1 ICP LPC922 Figure 2: IS31BL3233A Application Schematic Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014 2 IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER BILL OF MATERIALS Name Symbol Description Qty Supplier Part No. LED Driver U3 Torch and Flash LED driver 1 ISSI IS31BL3233A CPU U2 Microcontroller 1 NXP LPC922 LDO U1 Low-dropout regulator 1 PAM PAM3101 Inductor L1 1.0uH,DCR48mohm,Isat3.6A 1 Sunlord WPN252012H1R0MT Diode D1~D5 Diode, LED Blue, SMD 5 Everlight EHP-C04/UT01-P01/TR Diode D7, D9 Diode, LED White, peek current 3A 2 Everlight EHP-C04/NT01A-P01/ TR Bin3235 Capacitor C1, C3,C11 CAP,1µF,50V,±10%,SMD 2 Yageo CC0805KRX7R9BB105 Capacitor C2 CAP,10nF,50V,±10%,SMD 1 Yageo CC0603KRX7R9BB103 Capacitor C6, C7,C10 CAP,0.1µF,50V,±10%,SMD 2 Yageo CC0603KRX7R9BB104 Capacitor C8 CAP,4.7µF,10V,±10%,SMD 1 Yageo CC0805KRX7R6BB475 Capacitor C9 CAP,10µF,10V,±10%,SMD 1 Yageo CC0805KRX7R6BB106 Resistor R1~R5 RES,2.4k,1/16W,±5%,SMD 5 Yageo RC0603JR-072.4KL Resistor R6~R9 RES,4.7k,1/16W,±5%,SMD 4 Yageo RC0603JR-074.7KL Resistor R14,R15 RES,100k,1/16W,±5%,SMD 2 Yageo RC0603JR-07100KL Resistor RSETM RES,68k,1/16W,±1%,SMD 1 Yageo RC0603FR-0768KL Resistor RSETF RES,13k,1/16W,±1%,SMD 1 Yageo RC0603FR-0713KL Resistor R10,R11,D6,D8 Not connect 4 Connector CON1 2.5mm DC connector 1 Button Flash lamp, Torch, Bright-, Bright+ Button SMD 4 Bill of materials, refer to Figure 2 above. Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014 3 IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER 0 0 2 1 2 1 2 3 1 1 2 0 1 2 1 2 1 2 0 0 Figure 3: Board Component Placement Guide - Top Layer Figure 4: Board PCB Layout - Top Layer Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014 4 IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER 0 0 2 1 2 1 2 3 1 1 2 0 1 2 1 2 1 2 0 0 Figure 5: Board Component Placement Guide - Bottom Layer Figure 6: Board PCB Layout - Bottom Layer Copyright © 2014 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014 5