AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER General Description Features • • • • • • • • • • • • • • • • • Up to 88% Max power efficiency Wide input voltage range: 2.7V ~ 5.5V 1x, 1.5x, and 2x charge-pump modes Drive up to 4 white LEDs 120mA maximum output current through 4 channels Programmable switching frequency, default 1.2MHz Up Spread Spectrum Control with 10% frequency deviation 1-wire Serial Digital Interface (SDI) or PWM for dimming control Soft-start during power-up and mode switching Soft-stop during shutdown Short-circuit protection Over-voltage protection and under-voltage lockout Low quiescent current < 1µA Industry-leading low profile package Lead Free package: DFN3030-12 DFN3030-12: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish / RoHS Compliant (Note 1) The AP3152 is a high efficiency charge-pump white LED driver with 1x, 1.5x, 2x operating modes. The AP3152 operates on power supplies from 2.7v to 5.5v. It drives up to four channels of white LEDs while the intensity of each channel is configured by varying the respective current levels. Each channel can supply up to 30mA current. Up to four channels can be ganged together to provide maximum load current of 120mA. The Serial Digital Interface (SDI) provides the capability to configure the current for each LED channel. Some of other key features, such as Up Spread Spectrum Control, different charge-pump switching frequencies (0.6MHz/1.2MHz/1.8MHz), and PWM dimming control, can also be programmed through the interface. The AP3152 has built-in soft-start circuit to minimize the inrush current during power-up and mode switching. Various protections such as short-circuit, over-voltage, under-voltage, and thermal shutdown are integrated to ensure system reliability. The quiescent current of AP3152 during shutdown is less than 1µA. Applications • • • • • • Mobile Phone PDA (Personal Digital Assistant) White LED Backlighting Camera Flash LED Lighting LCD Modules Portable Devices Ordering Information AP 3152 X X X Package F : DFN3030-12 Note: Note: Lead Free G : Green Packing -7 : Taping 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7. Device Package Code AP3152F F Packaging (Note 2) DFN3030-12 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. AP3152 Rev. 1 1 of 11 www.diodes.com SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER Pin Assignment ( Top View ) D4 1 12 D3 SDI 2 11 D2 C1P 3 10 D1 C1N 4 9 GND 5 8 VIN 6 7 C2N VOUT C2P Exposed Pad DFN3030-12 Pin Descriptions Symbol Pin # Description D4 1 Current Sink Input #4. Connect to VOUT when un-used. SDI 2 1-wire Serial Digital Interface Input / PWM input C1P 3 Positive Terminal of Flying Capacitor. Connect a 1µF capacitor between C1P and C1N. C1N 4 Negative Terminal of Flying Capacitor. VOUT 5 C2P 6 C2N 7 The charge pump output voltage to drive load circuit. Connect a 1µF capacitor between this pin and ground. Positive Terminal of Flying Capacitor. Connect a 1µF capacitor between C2P and C2N. Negative Terminal of Flying Capacitor. VIN 8 Input Power Source. Connect a 1µF capacitor between this pin and ground. GND 9 Ground. D1 10 Current Sink Input #1. Connect to VOUT when un-used. D2 11 Current Sink Input #2. Connect to VOUT when un-used. D3 12 Current Sink Input #3. Connect to VOUT when un-used. GND EP PAD AP3152 Rev. 1 Exposed Pad (bottom). Connect to ground underneath the package. 2 of 11 www.diodes.com SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER Block Diagram C2P C2N C1P C1N VOUT VIN SDI SHORT CIRCUIT PROTECTION CHARGE PUMP SWITCHES SERIAL DIGITAL INTERFACE OVER VOLTAGE PROTECTION OUTPUT VOLTAGE REGULATION & LED SHORT CIRCUIT DETECTION DIGITAL CONTROL BLOCK D1 BANDGAP D2 OSCILLATOR D3 OVER TEMPERATURE PROTECTION CURRENT CONTROL D4 UNDER VOLTAGE LOCKOUT GND Typical Application Circuit VIN 8 VIN C2P 1μF CIN C2 N C1 P C1 N 6 7 3 4 1μF C2 1μF C1 AP3152 VOUT D4 LED SDI 2 SDI GND 1μF Cout 5 D3 LED D2 LED D1 LED D4 1 12 D3 D2 11 10 D1 9 AP3152 Rev. 1 3 of 11 www.diodes.com SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER Absolute Maximum Ratings Symbol VIN VSDI Note: Description Input Voltage SDI to GND Voltage IOUT Maximum DC Output Current TJ HBM Operating Junction Temperature Range Value Units -0.3 to 6 V -0.3 to VIN + 0.3 150 Human Body Model ESD Protection V mA -40 to 150 °C 2 KV 3. Exceeding Absolute Maximum Ratings will cause permanent damage to the device. Recommended Operating Conditions Symbol VIN TA AP3152 Rev. 1 Parameter Input Voltage Operating Ambient Temperature 4 of 11 www.diodes.com Min Max Units 2.7 -40 5.5 85 V °C SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER Electrical Characteristics CIN = COUT = C1 = C2 = 1.0µF; TA = 25°C, VIN = 3.5V. Unless otherwise stated. Symbol IQ ISHDN IDX ID-Match TSS FCLK FSSP VSDI(L) VSDI(H) TSLO TSHI fPWM Description Quiescent Current Shutdown Current ISINK Current Accuracy1 Current Matching2 Soft-start Time Switching Clock Frequency Spread Spectrum SDI Threshold Low SDI Threshold High SDI Low Time SDI High Time PWM Frequency (Range 1) PWM Frequency (Range 2) TPWM PWM Signal Period TPLO TPHI PWM Signal Low (LED off) PWM Signal High (LED on) TOFF Chip Disable (held low) TSEP Interval between SDI sequences (held high) ISDI PD θJA θJC Note: SDI Input Leakage Maximum Power Dissipation1 Thermal Resistance1 – Junction to Ambient Maximum Thermal Resistance1 – Junction to case Conditions 1X Mode Fosc=1.2MHz, SDI=HIGH, no load SDI = 0 ISINK = 20mA VF: D1=D2=D3=D4 Enabled VIN = 2.7V VIN = 5.5V Min Typ. Max Units 1.2 mA -1 -10 1 10 5 1 0.6/1.2/1.8 +10 0.4 1.6 0.05 0.05 0.2 20 1/ fPWM-Max 1 1 PWM No PWM PWM No PWM 65 512 65 512 -1 50 50 1.5 30 1/ fPWM-Min TPWM – 1 TPWM – 1 100 800 100 800 1 µA % % ms MHz % V V µs µs KHz KHz µs µs µs ms µs ms µs µA 0.85 W DFN3030-12 (Note 6) 160 °C/W DFN3030-12 (Note 6) 21 °C/W 4. Determined by the average current levels of all active channels. 5. Defined as the deviation of any sink current from the average of all active current channels 6. Device mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout. AP3152 Rev. 1 5 of 11 www.diodes.com SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER Typical Performance Characteristics Efficiency vs. Supply Voltage Turn-On to 1X Mode (VIN = 4.2V; 20mA Load) Turn-On from 1.5X Mode (VIN = 3.5V; 20mA Load) Turn-On to 2X Mode (VIN = 2.7V; 20mA Load) Turn-Off from 1.5X Mode (VIN = 3.5V; 20mA Load) Current Matching vs. Temperature AP3152 Rev. 1 6 of 11 www.diodes.com SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER Typical Performance Characteristics (Continued) Load Characteristics (VIN = 3.5V; 1.5X Mode; 14mA Load) Load Characteristics (VIN = 2.7V; 2X Mode; 14mA Load) Load Characteristics (VIN = 3.5V; 1.5X Mode; 20mA Load) Load Characteristics (VIN = 2.7V; 2X Mode; 20mA Load) Load Characteristics (VIN = 3.5V; 1.5X Mode; 30mA Load) Load Characteristics (VIN = 3.1V; 2X Mode; 30mA Load) AP3152 Rev. 1 7 of 11 www.diodes.com SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER Typical Performance Characteristics (Continued) Enable Threshold High vs. Input Voltage Enable Threshold Low vs. Input Voltage PWM Dimming Operation (VIN = 3.5V; 20mA Load; Duty=1:1; f=1KHz) PWM Dimming Operation (VIN = 3.5V; 20mA Load; Duty=11:1; f=1KHz) PWM Dimming Operation (VIN = 3.5V; 20mA Load; Duty=1:11; f=1KHz) AP3152 Rev. 1 8 of 11 www.diodes.com SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER Function Description General Functional Description The AP3152 is designed for white LED applications. An internal comparator circuit compares the voltage at each constant current sink input against a reference voltage. To ensure maximum power efficiency, the most appropriate switching mode (x1, x1.5, x2) is automatically selected. In applications, only four external components are required: two 1µF ceramic flying capacitors (C1 and C2), one 1µF ceramic capacitor each for input and output (CIN, COUT). 6 CH2, CH3 and CH4 in dimming control 7 CH1 and CH2 in dimming control 8 CH3 and CH4 in dimming control 9 CH1 in dimming control 10 CH2 in dimming control 11 CH3 in dimming control 12 CH4 in dimming control AP3152 drives up to four white LEDs with a maximum current of 30mA each. A total of 120mA is provided to the four channels. Through SDI, the current into each channel can be configured in accordance to specific protocol and pre-defined values. 13 Low-Current Mode (Maximum Current set to 2mA) 14 Maximum Current set to 14mA (All channels) 15 Maximum Current set to 20mA (All channels) Maximum output current can be set to one of the four possible scales: 2mA, 14mA, 20mA, 30mA. Among these, the ‘2mA’ setting is called “low current mode”. This would be useful for applications which require very low operating current, e.g. transmissive LCD panels. 16 Maximum Current set to 30mA (All channels) 17 10% Up Spread Spectrum Control Enable/Disable 18 Switching Frequency set to 0.6Mhz 19 Switching Frequency set to 1.2Mhz 20 Switching Frequency set to 1.8Mhz For each maximum output current scale, there are 16 current level settings separated from one another by approximately 1dB. While level-16 corresponds to maximum current output, level-1 corresponds to zero output current. As the current level varies logarithmically, intensity of the LED changes in a linear fashion. The current level at the individual channels is configured via SDI which supports data rate up to 10MHz. It allows the main controller in the system to be offloaded to perform more mission-critical functions. Serial Digital Interface SDI is a general purpose1-wire digital interface designed to transport digital controls for power management ICs such as AP3152. The current levels of the four channels can be configured either together or individually. Up to 16 current levels are allowed. A generic system controller can easily support the SDI protocol via bit-banging over its general purpose I/Os. The SDI protocol is simple yet flexible enough to accommodate different switching clock frequencies. Any sequence of negative-edged pulses of 63 or less (see table 1), separated by TSEP at the SDI pin is interpreted by AP3152 as a channel configuration event. In future, the number of pulses can be extended to support additional commands. In addition to the SDI protocol, dimming control can also be achieved by presenting a timing-specific PWM signaling at the SDI pin. Number of Falling Edges 1 Command Description Current level step up (1 up to level 16) 2 Current level step down (16 down to level 1) 3 Current level set to 16 (maximum current level) 4 Current level set to 1 (minimum current level) 5 All 4 Channels in dimming control AP3152 Rev. 1 21~62 63 Reserved PWM Dimming Control Enable/Disable Dimming Control Current Level Setting AP3152 supports four maximum output current scales including 30mA, 20mA, 14mA, and 2mA low-current scale. For each maximum current scale, there are 16 current level settings separated from one another by appromimately 1dB (see table 2). By default, maximum current scale is set to 20mA and dimming control current level is set to maximum (level 16). Through SDI, certain channels or all four channels can be selected, and dimming control level for these channels can be set to maximum (level 16), minimum(level1), up from minimum to maximum or down from maximum to minimum (see table 1). Dimming Control Current Levels 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 9 of 11 www.diodes.com Iout (20mA) Iout (30mA) Iout (14mA) Low-Current (2mA) 20.0 30.0 14.0 17.8 26.7 12.5 15.9 23.8 11.1 14.3 21.4 10.0 12.7 19.0 8.9 11.1 16.7 7.8 10.2 15.2 7.1 8.9 13.3 6.2 7.9 11.9 5.6 7.0 10.5 4.9 6.3 9.5 4.4 5.7 8.6 4.0 5.1 7.6 3.5 4.4 6.7 3.1 4.1 6.2 2.9 0.0 0.0 0.0 Table 2: Dimming Control Current Level 2.0 1.78 1.59 1.43 1.27 1.11 1.02 0.89 0.79 0.70 0.63 0.57 0.51 0.44 0.41 0.0 SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER Disabled Current Sinks Unused current channels must be disabled by connecting the sinks to VOUT with only a small sense current flowing through the disabled channel. Soft-Start and Soft-Stop Soft-start and Soft-stop function are incorporated to prevent excessive inrush current during power-up, mode switching, power-down, transition out of stand-by mode. Short-Circuit Protection Short-circuit protection function is incorporated to prevent excessive load current when either flying cap terminals or output pin electrically tied to a very lower voltage or ground. Over-Voltage Protection Over-voltage protection function is incorporated to limit the output voltage under a safe value to avoid on-chip device breakdown. Under-Voltage Lockout Under-voltage lockout feature disables the device when the input voltage drops below UVLO threshold. will be disabled and enter stand-by mode. The operation will be resumed whenever the die cools off sufficiently. Switching Frequency By default, AP3152 is working at 1.2Mhz switching frequency. It can also work at 0.6MHz or 1.8MHz switching frequency set through SDI. User can choose the appropriate switching frequency with consideration of noise immunity, input/output voltage ripple requirement, and capacitor selection etc. Up Spread Spectrum Control When this feature is enabled through SDI, the switching frequency periodically varies between 100% and 110% of nominal frequency. It flattens the peak energy on nominal frequency over a range of frequency band so that EMI effect is significantly reduced. PWM Dimming Control The AP3152 provides flexible dimming control with either 16-level SDI protocol control or PWM dimming control through SDI pin. When PWM dimming control is enabled, the sink current is adjusted by the duty cycle of the signal applied on SDI pin. Thermal Shutdown When the die temperature exceeds the thermal limit, the device Marking Information ( Top View ) XX YMX Part Number AP3152 AP3152 Rev. 1 XX : FH : AP3152 Y : Year 0~9 M : Month A~L X : G : Green Package DFN3030-12 10 of 11 www.diodes.com Identification Code FH SEPTEMBER 2007 © Diodes Incorporated AP3152 120mA HIGH EFFICIENCY WHITE LED DRIVER ( unit: mm ) 0.57/0.63 Package Information 0.15max. 0.10 C 2x 0/0.05 0.25 A 0.08 C A 2.3 / 2.5 3 0.25/0.55 1.5 / 1.7 R0 . 2.9 / 3.1 C 2.9 / 3.1 B 2x- Seating plane 0.25 B 0.45typ 0.18/0.28 0.10 M C A B Bottom View IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated. AP3152 Rev. 1 11 of 11 www.diodes.com SEPTEMBER 2007 © Diodes Incorporated