Datasheet Max. 28.5V Output 2Strings(25mA/ch) White LED Driver BD65B60GWL General Description Key Specifications BD65B60 is a white LED driver IC that integrates PWM Input voltage range: 2.7V to 5.5V step-up DC/DC converter with boost-capability of up to Output voltage range: Max. 28.5V maximum 28.5V and current driver with drive capability of up Operational LED Channel: 2ch or 1ch to 25mA(Typ.) maximum setting. Precise brightness can be Switching frequency: 0.6MHz/1.1MHz(Typ.) controlled at wide ranges through the external PWM pulse LED Current per Channel: 25mA (Max.) input. LED current accuracy: 3.0% (Max.) This IC features highly accurate current drivers with low Quiescent current 0A (Typ.) differential current errors between channels, thus, reducing Operating temperature range: -40C to +85C brightness spots on the LCD panel. Moreover, its small package is suited for saving space. Package W(Typ.) x D(Typ.) x H(Max.) UCSP50L1 (12pin) 1.40mm x 1.80mm x 0.55mm Features High efficiency PWM step-up DC/DC converter f = 1.1MHz(Typ.), f = 0.60MHz(Typ.) SW1 SW2 High accuracy & good matching current drivers (2ch) Soft Start function Drives up to 8 LEDs in series per channel Lower input voltage range requirement (2.7V to 5.5V) Applications Backlight for smartphones, games, digital video cameras, digital single-lens reflexes, digital still cameras, digital photo frames, Portable DVD player, etc. Pin Configuration (Bottom View) Typical Application Circuit D SW VOUT LED2 10H 2.7V to 5.5V COUT C GND RESET LED1 CVBAT B VBAT PWM SCL VBAT SW VOUT A ISET VIO SDA 1.65V to 3.3V VIO CVIO 1 2 3 SCL BD65B60GWL LED1 SDA Controller LED2 RESET GND ISET PWM PWMIN RSET Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays . www.rohm.com TSZ02201-0G3G0C210420-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/47 TSZ2211114001 3.JUN.2013 Rev.001DatasheetDatasheet BD65B60GWL Pin Descriptions PIN PIN Terminal VBAT I/O Function No. Name diagram A1 ISET In Resistor Connection for LED Current setting A PIN VIO voltage Terminal. Connect a 1.65V to 3.3V A2 VIO In supply to VIO and bypass to GND with a 0.1F or B GND greater ceramic capacitor. 2 Serial Data input for I C Interface A This pin is needed to connect external pull-up A3 SDA In resistor to VIO pin. B Please refer to P.37 SDA, SCL Pull-up Resistor Selection. VBAT voltage Terminal. Connect a 2.7V to 5.5V PIN B1 VBAT In supply to VBAT and bypass to GND with a C 1.0F(Typ.) or greater ceramic capacitor. Input pin for controlling the current driver. GND B2 PWM In This pin has an internal pull-down resistor. B B Please refer to P.35 Brightness Control 2 Serial Clock input for I C Interface This pin is needed to connect external pull-up B3 SCL In resistor to VIO pin. B Please refer to P.37 SDA, SCL Pull-up Resistor Selection. VBAT C1 GND - Power Ground for internal switching transistor C Active-low reset. Pull this pin high to enable the IC. GND This pin is needed to connect external pull-down C2 RESET In B resistor. C Please refer to P.29 Functional Descriptions Input terminal to Internal Current Driver. C3 LED1 In B LED cathode connection. Switching terminal where an external inductor is connected. Internally connects to an NMOS switch. D1 SW Out Connect the inductor as close as possible to SW B terminal to reduce parasitic inductance and capacitance. Please refer to PCB layout of P.39. Terminal for monitoring the output voltage of switching regulator. Also, detects SBD open and OVP. Please refer to P.31. D2 VOUT In Connect VOUT to the positive terminal of the output B capacitor (COUT). Recommended COUT value is 1.0F(Typ.) for DC mode or 2.2F(Typ.) for PWM mode. Input terminal to Internal Current Driver. D3 LED2 In B LED cathode connection. www.rohm.com TSZ02201-0G3G0C210420-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/47 TSZ2211115001 3.JUN.2013 Rev.001