AP3156

AP3156 HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP FOR WHITE LED APPLICATIONS Features • • VIN Range: 2.7V to 5.5V Fully Programmable Current with Single Wire • 32-Step Logarithmic Scale • 20/25mA Max Current per Channel • Four Low Current Settings Down to 50µA • Low IQ (50µA) for Low Current Mode Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage Drives up to Six Channels of LEDs Individual Main/Sub-Group Control No Inductors, Low Noise Operation 0.5/1/2MHz Constant Switching Frequency Small Application Circuit Built-In Thermal Protection Built-In Auto-Disable For Open Circuit Automatic Soft Start IQ 1MHz data rate), the LED current drive of the AP3156 can be changed successively to brighten or dim LEDs in smooth transitions or in abrupt steps, giving the user complete programmability and real-time control of LED brightness. There are 32 current level settings separated from one another by approximately 0.5dB (see Constant Current Programming Level table). Code 1 is full-scale current, and Code 31 is full scale attenuated roughly 15dB. Code 32 is reserved as a “no current” setting. Constant Current Programming Levels (mA) 20mA Max 25mA Max Data IOUT (mA) IOUT (mA) 1 20 25 2 18.9 23.6 3 17.8 22.3 4 16.8 21.0 5 15.9 19.9 6 15.0 18.7 7 14.2 17.7 8 13.4 16.7 9 12.6 15.8 10 11.9 14.9 11 11.2 14.1 12 10.6 13.3 13 10.0 12.5 14 9.5 11.8 15 8.9 11.2 16 8.4 10.5 17 8.0 10.0 18 7.5 9.4 19 7.1 8.9 20 21 22 23 24 25 26 27 28 29 30 31 32 6.7 6.3 6.0 5.6 5.3 5.0 4.7 4.5 4.2 4.0 3.8 3.6 0 8.4 7.9 7.5 7.0 6.7 6.3 5.9 5.6 5.3 5.0 4.7 4.4 0 Low Current Output Level Setting The AP3156 has a distinct Low Current mode with ultra-low quiescent current. For drive currents of 2mA or less, the device operates with significantly reduced quiescent current. Low Current Programming Levels (mA) Data Current (mA) 1 2 2 1 3 0.5 4 0.05 5 0 Serial Digital Interface SDI is a general purpose 1-wire digital interface designed to transport digital controls for power management ICs such as AP3156. The current levels of the six channels can be configured either together, individually or specific grouping. Up to 32 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 Instruction & Data Table) separated by TSEP at the SDI pin is interpreted by the AP3156 as a channel configuration event. In future, the number of pulses can be extended to support additional commands. AP3156 Rev. 1 9 of 15 www.diodes.com SEPTEMBER 2009 © Diodes Incorporated AP3156 HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP FOR WHITE LED APPLICATIONS Functional Description Instruction & Data Table First Second Sequence Sequence 1~3 4~7 8 1~32 1 2 3 4~32 9 1 (Continued) 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 Soft-start is incorporated to prevent excessive inrush current during power-up, mode switching, and transitioning 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. Thermal Auto Shutdown When the die temperature exceeds the thermal limit, the device will be disabled and enter stand-by mode. The operation resumes whenever the die cools off sufficiently. Switching frequency By default, the AP3156 is working at 1MHz switching frequency. It can also work at 0.5MHz or 2MHz switching frequency which can be set through the Serial Digital Interface. An user can choose the appropriate switching frequency with consideration of noise immunity, input and output voltage ripple requirement, and capacitor selection. Description No Action Reserved Switching frequency selected to 0.5MHz Switching frequency selected to 1MHz (default) Switching frequency selected to 2MHz Reserved 20mA Constant Current Mode, 32 current level supported (default) Low Current Mode, 4 current level supported 25mA Constant Current Mode, 32 current level supported Reserved Set current level for all 6 Channels Set current level for CH1, CH2, CH3 Set current level for CH4, CH5, CH6 Set current level for CH1, CH2, CH3, CH4 Set current level for CH5, CH6 Set current level for CH1, CH2, CH3, CH4, CH5 Set current level for CH6 Set current level for CH5 Set current level for CH4 Set current level for CH3 Set current level for CH2 Set current level for CH1 Reserved Soft Reset 1) 1MHz switching frequency 2) 20mA Constant Current Mode 3) All Channels in Current Level Setting 32 (0mA) Null Sequence Reserved 2 3 4~32 10 11 12 13 14 15 16 17 18 19 20 21 22~32 33 1~32* 1~32* 1~32* 1~32* 1~32* 1~32* 1~32* 1~32* 1~32* 1~32* 1~32* 1~32* - 34 35~63 - * Only 1~5 are valid current settings at Low Current Mode. AP3156 Rev. 1 10 of 15 www.diodes.com SEPTEMBER 2009 © Diodes Incorporated AP3156 HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP FOR WHITE LED APPLICATIONS Serial Digital Interface SDI Command Timing Protocol For the SDI command to be successfully received by the AP3156, all SDI timing specifications must be satisfied. When no command is being sent, the SDI pin should be held High. If the SDI pin goes Low and stays Low for a time length between TSLO(min) and TSLO(max) and then goes High and stays High for the length between TSHI(min) and TSHI(max), one falling edge is registered by the AP3156. The total number of falling edges registered before the SDI pin is held High for longer than the maximum separation time TSEP(max) identifies the command that has been received by the AP3156. The next series of falling edges before another separation time of TSEP represents the next command. In other words, the AP3156 counts the number of consecutive falling edges on the SDI pin and a different number represents a different command. Each command is executed after it is successfully received. If at any time the SDI pin is held Low for longer than the maximum chip disable time TOFF(max), then the AP3156 will be turned off and enters the shutdown mode. Setting the SDI pin switching from Low to High will re-enable the AP3156 and leave the shutdown mode. If the SDI pin is held on for a time duration over TSEP, then an end of a sequence (EOS) occurs with a number of pulse conformed to specified timing. A valid dual-sequence command occurs when one valid sequence is defined as an instruction, and the other is defined as data. Both sequences have number of pulses less than 33. Also, a valid single-sequence command occurs when the sequence has number of pulses greater than 32. First Sequence TSHI TSLO TSEP Second Sequence TSEP SDI 1 2 8 9 10 1 2 Channel Selection Current Setting Channel 1 in dimming control Channel 2 in dimming control Channel 3 in dimming control Channel 4 in dimming control Channel 5 in dimming control Channel 6 in dimming control Set Channel 1 to current level 2. Set Channel 2 to current level 2. Set Channel 3 to current level 2. Set Channel 4 to current level 2. Set Channel 5 to current level 2. Set Channel 6 to current level 2. Channel D1 Channel D2 Channel D3 Channel D4 Channel D5 Channel D6 Figure 1: Dimming Control Selection (Dual-Sequence Command) AP3156 Rev. 1 11 of 15 www.diodes.com SEPTEMBER 2009 © Diodes Incorporated AP3156 HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP FOR WHITE LED APPLICATIONS Serial Digital Interface (Continued) First Sequence Second Sequence TSHI TSLO TSEP TSEP SDI 1 2 7 8 9 1 2 Current Mode Selection Select Low Current Mode Figure 2: Current Mode Selection (Dual-Sequence Command) First Sequence Second Sequence TSHI TSLO TSEP TSEP SDI 1 2 6 7 8 1 2 Switching Frequency Selection Select Switching Frequency to 1 MHZ Figure 3: Switching Frequency Selection (Dual-Sequence Command) First Sequence TSHI TSLO TSEP SDI 1 2 31 Soft Reset 32 33 Figure 4: Soft Reset (Single-Sequence Command) AP3156 Rev. 1 12 of 15 www.diodes.com SEPTEMBER 2009 © Diodes Incorporated AP3156 HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP FOR WHITE LED APPLICATIONS Marking Information (1) QFN4040-16 ( Top View ) XX YW X XX : F7 : AP3156 Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green Identification Code F7 Part Number AP3156FVG-7 Package QFN4040-16 Package Information (1) Package Type: QFN4040-16 (All Dimensions in mm) 0.10 C C L 16X- 0.08 C 0.55/0.65 0.05Max. 0.15Max. 0.25 A Seating Plane Side View C Land Pattern Recommendatrion 4 3.7 2X- B 3.90/4.10 A 10 4 2.3/2.5 2.3/2.5 3.7 (Pin #1 ID) 16 3.90/4.10 1 (Pin #1 ID) 0.55/0.65 4 2X- 0.25 B 0.65Typ. 0.28/0.38 0.10 CAB 12x-0.65 Bottom View Bottom View AP3156 Rev. 1 13 of 15 www.diodes.com SEPTEMBER 2009 © Diodes Incorporated 16x-1.0 AP3156 HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP FOR WHITE LED APPLICATIONS Taping Orientation (Note 8) Note: 8. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf AP3156 Rev. 1 14 of 15 www.diodes.com SEPTEMBER 2009 © Diodes Incorporated AP3156 HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP FOR WHITE LED APPLICATIONS IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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