S-8813

Rev.2.1_00 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) S-8813 Series The S-8813 Series is a PFM control charge pump DC-DC converter with a built-in constant-current circuit, and was developed using CMOS technology. Its constant current output makes this series ideal as a power supply for current drive LEDs. The S-8813 Series features three output channels and can drive three LEDs. This series is available in two types: a variable voltage type and a variable current setting resistance type. Moreover, since small ceramic capacitors can be used as external capacitors (pump capacitors, input capacitors, output capacitors), the S-8813 Series contributes to set miniaturization. Features • PFM control CMOS charge pump • Built-in constant-current circuit • Power supply voltage: 2.7 V to 4.5 V • Output current value: A current variable is possible between 5.0 mA and 18 mA (At VIOUT1,2,3≤4.0 V, VIN=3.0 V) Variable voltage type and Variable current setting resistance type are available. • Terminal output current matching: ±1% max. • Built-in soft start circuit: 1.5 ms typ. • Constant current output pins: 3 channels, ±5% accuracy • Oscillation frequency: 600 kHz typ. • ON/OFF function provided (During standby: 1 µA max.) • Ultra-small package: 10-Pin SON(B) • Lead-free products Applications • Power supply for white LED display backlights • Constant-current circuit • Cellular phones and PDAs using 1-cell lithium batteries • Power supply for flat panel displays Package Package Name 10-Pin SON(B) Package PE010-A Drawing Code Tape PE010-A Reel PE010-A Product Name List • S-881300CPE-IPATFG (Variable current setting resistance type) • S-881300BPE-IOQTFG (Variable voltage type) Seiko Instruments Inc. 1 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Block Diagrams 1. S-881300CPE V IN C IN =4.7 μF SW 1 Rs C+ C PUMP =0.22 μF SW 3 C− SW 2 P FM control oscillator (600 kHz) CPOUT C OUT =10 μF S witch control circuit + − Rf I OUT1 IOUT2 – SW 4 Soft Start circuit ON/OFF circuit O N/OFF R eference voltage + IOUT3 RISET R 1 *1 GND 2. S-881300BPE V IN C IN =4.7 μ F SW 1 CPOUT Rs C+ C PUMP =0.22 μ F SW 3 C− SW 2 P FM control oscillator (600 kHz) C OUT=10 μ F S witch control circuit + − Rf IOUT1 IOUT2 + SW 4 S oft Start circuit ON/OFF circuit ON/OFF R eference voltage − R 2 *2 IOUT3 VISET GND *1. Current setting resistance *2. Internal resistance Figure 1 Block Diagram 2 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Pin Configuration 10-Pin SON(B) Top View Table 1 Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 Symbol IOUT1 IOUT2 IOUT3 C+ C− GND VIN CPOUT Description Output pin (constant-current output) Output pin (constant-current output) Output pin (constant-current output) Pump capacitor connection pin (positive pin) Pump capacitor connection pin (negative pin) GND pin Voltage input pin Charge pump output pin (capacitor connection pin) Variable output current pins In the case of RISET, a resistor is connected to this pin and changing the resistance value can vary the output current. In the case of VISET, changing the voltage applied to this pin can vary the output current. Power-off pin High level: Normal operation (Step-up operation) Low level: Stepping-up halt (Whole circuit stopped) 1 2 3 4 5 10 9 8 7 6 Figure 2 Pin Assignment 9 RISET / VISET 10 ON/ OFF Seiko Instruments Inc. 3 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Absolute Maximum Ratings Table 2 Absolute Maximum Ratings (Unless otherwise specified, Ta = 25°C) Item IOUT 1, 2, 3 pin voltage C+ pin voltage C− pin voltage VIN pin voltage CPOUT pin voltage RISET/VISET pin voltage ON/ OFF pin voltage Symbol VIOUT1,2,3 VC+ VC− VIN VCPOUT VRISET/VVISET VON/ OFF Absolute Maximum Rating VSS−0.3 to VSS+7 VSS−0.3 to VSS+7.5 VSS−0.3 to VSS+7 VSS−0.3 to VSS+5 VSS−0.3 to VSS+7 VSS−0.3 to VSS+7 VSS−0.3 to VIN+0.3 290 (When not mounted on board) 700*1 Unit V V V V V V V mW mW °C °C Power dissipation Operating ambient temperature Storage temperature *1. PD Topr Tstg −40 to +85 −40 to +125 When mounted on board [Mounted board] (1) Board size: 114.3 mm × 76.2 mm × t1.6 mm (2) Board name: JEDEC STANDARD51-7 Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. (1) When mounted on board 800 Power Dissipation PD (mW) 700 600 500 400 300 200 100 0 0 50 100 150 (2) When not mounted on board 400 Power Dissipation PD (mW) 300 200 100 0 0 50 100 150 Ambient Temperature Ta (°C) Ambient Temperature Ta (°C) Figure 3 Power Dissipation of Package 4 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Electrical Characteristics 1. S-881300CPE Table 3 Electrical Characteristics (Unless otherwise specified, VIN = 3.0 V, current setting resistance = 5.6 kΩ, Ta = 25°C) Test Symbol Conditions Min. Typ. Max. Unit Circuit VIN IOUT ⎯ VIN = 3.0 V to 4.5 V VIOUT1,2,3*1 ≤ 3.6 V VIN = 3.0 V to 4.5 V VI OUT1,2,3*1 ≤ 4.0 V VIN = 2.7 V to 3.0 V VI OUT1,2,3*1 ≤ 3.6 V VIN = 3.0 V, VIOUT= 3.0 V to 4.0 V VIN = 3.0 V to 4.5 V VIOUT ≤ 3.6 V IOUT1,2,3 = 17.8 mA VIOUT = 3.6 V VIN = 2.7 V to 4.5 V IOUT1,2,3 = 18 mA VCPOUT = 4.75 V Measure waveform at C− pin VIN = 3.0 V, IOUT1,2,3 = 18 mA VIN = 2.7 V to 4.5 V VCPOUT = 4.75 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V 2.7 23 18 14 ⎯ ⎯ −5.0 −1.0 ⎯ 540 ⎯ ⎯ ⎯ 2.0 ⎯ −0.1 −0.1 0.3 0.98 ⎯ ⎯ ⎯ ⎯ 0.5 0.5 ⎯ ⎯ ⎯ 600 82 1 0.3 ⎯ ⎯ ⎯ ⎯ 1.5 1 4.5 ⎯ ⎯ ⎯ 1 1 +5.0 +1.0 100 660 ⎯ 1.5 1 ⎯ 0.3 0.1 0.1 3 1.02 ms V 2 μA mVp-p kHz % mA μA V 1 2 1 % V mA 2 Item Operation input voltage Stabilized output current Output current VIOUT characteristics Output current input stability Output current accuracy Inter-pin output current variation Ripple voltage Maximum oscillation frequency Efficiency*2 Operation consumption current Standby consumption current Power-off pin input voltage (high level) Power-off pin input voltage (low level) Power-off pin input current (high level) Power-off pin input current (low level) Soft start time RISET pin voltage ΔIOUT1 ΔIOUT2 ΔIOUT1 IOUT ΔIM VRIP fosc η ISS1 ISSS VSH VSL ISH ISL tSS VRISET *1. VIOUT1, 2, 3 are the voltages of the IOUT pin. *2. “Efficiency” in the electrical characteristics means the efficiency of the charge pump circuit block. The ideal efficiency is indicated by the following expression. Efficiency =[ VCPOUT × (IOUT1 +IOUT2 +IOUT3) ] / [ 2.0 × VIN × (IOUT1 +IOUT2 +IOUT3) ] The ideal efficiency including the constant current circuit is expressed as following expression. Efficiency =[ (VIOUT1 ×IOUT1) + (VIOUT2 ×IOUT2) + (VIOUT3 ×IOUT3) ] / [ 2.0 ×VIN × (IOUT1 +IOUT2 +IOUT3) ] Remark The numbers in the "test circuit" column correspond to the circuit numbers in the “Measurement Circuits” section. Seiko Instruments Inc. 5 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series 2. S-881300BPE Table 4 Electrical Characteristics (Unless otherwise specified, VIN = 3.0 V, current setting voltage = 1.8 V, Ta = 25°C) Test Symbol Conditions Min. Typ. Max. Unit Circuit VIN IOUT ⎯ VIN = 3.0 V to 4.5 V VIOUT1,2,3*1 ≤ 3.6 V VIN = 3.0 V to 4.5 V VI OUT1,2,3*1 ≤ 4.0 V VIN = 2.7 V to 3.0 V VI OUT1,2,3*1 ≤ 3.6 V VIN = 3.0 V, VIOUT = 3.0 V to 4.0 V VIN = 3.0 V to 4.5 V VIOUT ≤ 3.6 V IOUT1,2,3 = 18 mA VIOUT = 3.6 V VIN=2.7 V to 4.5 V VCPOUT = 4.75 V Measure waveform at C- pin VIN = 3.0 V VIN = 2.7 V to 4.5 V VCPOUT = 4.75 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V VIN = 2.7 V to 4.5 V 2.7 23 18 14 ⎯ ⎯ −5.0 −1.0 ⎯ 540 ⎯ ⎯ ⎯ 2.0 ⎯ −0.1 −0.1 0.3 0.5 ⎯ ⎯ ⎯ ⎯ 0.5 0.5 ⎯ ⎯ ⎯ 600 82 1 0.3 ⎯ ⎯ ⎯ ⎯ 1.5 ⎯ 4.5 ⎯ ⎯ ⎯ 1 1 +5.0 +1.0 100 660 ⎯ 1.5 1 ⎯ 0.3 0.1 0.1 3 1.8 ms V 2 μA mVp-p kHz % mA μA V 1 2 1 % V mA 2 Item Operation input voltage Stabilized output current Output current VIOUT characteristics Output current input stability Output current accuracy Inter-pin output current variation Ripple voltage Maximum oscillation frequency Efficiency*2 Operation consumption current Standby consumption current Power-off pin input voltage (high level) Power-off pin input voltage (low level) Power-off pin input current (high level) Power-off pin input current (low level) Soft start time VISET pin voltage ΔIOUT1 ΔIOUT2 ΔIOUT1 IOUT ΔIM VRIP fosc η ISS1 ISSS VSH VSL ISH ISL tSS VVISET *1. VIOUT1, 2, 3 are the voltages of the IOUT pin. *2. “Efficiency” in the electrical characteristics means the efficiency of the charge pump circuit block. The ideal efficiency is indicated by the following expression. Efficiency =[ VCPOUT × (IOUT1 +IOUT2 +IOUT3) ] / [ 2.0 × VIN × (IOUT1 +IOUT2 +IOUT3) ] The ideal efficiency including the constant current circuit is expressed as following expression. Efficiency =[ (VIOUT1 ×IOUT1) + (VIOUT2 ×IOUT2) + (VIOUT3 ×IOUT3) ] / [ 2.0 ×VIN × (IOUT1 +IOUT2 +IOUT3) ] Remark The numbers in the "test circuit" column correspond to the circuit numbers in the “Measurement Circuits” section. 6 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Measurement Circuits 1. IOUT1 IOUT2 ON/OFF RISET/ VISET IOUT3 CPOUT C+ C− VIN GND 4.7 μF 5.6 kΩ A A A A A A A A A 2. ON/OFF RISET/ VISET CPOUT VIN GND 4.7 μF 5.6 kΩ IOUT1 IOUT2 IOUT3 C+ 0.22 μF C− A 10 μF A A A A Figure 4 Measurement Circuits Seiko Instruments Inc. 7 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Operation 1. Basic Operation The S-8813 series controls by using the pulse frequency modulation (PFM) method. The SW1 to SW4 switching transistors are switched ON/OFF with the clock generated by the internal oscillator (OSC), and operates the step-up charge pump. The output voltage is feed back and the voltage split by feedback resistances Rs and Rf and reference voltage (Vref) are compared by a comparator. This comparator signal is used to modulate the oscillation pulse frequency in order to keep the output voltage constant. Using this constant output voltage as the voltage source, a constant current is created using Vref and the external resistance value applied to the RISET pin, and this constant current is supplied as the current output to the three channels of output pins (IOUT1 to IOUT3). Therefore, even if the white LED VF (forward voltage) varies between 3 V and 4 V, a constant current can be supplied, making it possible to reduce fluctuations in brightness and keep white LEDs shining at a constant brightness. 8 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series S-881300CPE V IN C IN =4.7 μF SW 1 Rs C+ C PUMP =0.22 μF SW 3 C− SW 2 P FM control oscillator (600 kHz) CPOUT C OUT =10 μF S witch control circuit + − Rf I OUT1 IOUT2 – SW 4 Soft Start circuit ON/OFF circuit O N/OFF R eference voltage + IOUT3 RISET R 1 *1 GND S-881300BPE V IN C IN =4.7 μF SW 1 Rs C+ C PUMP =0.22 μF SW 3 C− SW 2 P FM control oscillator (600 kHz) CPOUT C OUT =10 μF S witch control circuit + − Rf I OUT1 IOUT2 + SW 4 Soft Start circuit ON/OFF circuit ON/OFF R eference voltage − R2 *2 IOUT3 VISET GND *1. Current setting resistance *2. Internal resistance Figure 5 Block Diagram Seiko Instruments Inc. 9 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series 2. Step-up Charge Pump The step-up charge pump steps up the voltage by switching ON/OFF the SW1 to SW4 switching transistors. First, in order to charge the pump capacitance (CPUMP), set SW1 to OFF, SW2 to ON, SW3 to OFF, and SW4 to ON (charge cycle). Following charging the electricity, in order to discharge the charged electricity to the output capacitance (COUT), SW1 set the switches as to ON, SW2 to OFF, SW3 to ON, and SW4 to OFF (discharge cycle). The input voltage can be stepped up to a constant voltage value by repeating this charge cycle and discharge cycle. In the S-8813 Series, the VIN voltage range of 2.7 V to 4.5 V is stepped up to VCPOUT = 5 V. SW2: ON SW1: OFF VIN Current flow CPUMP=0.22 μF COUT=10 μF SW4: ON SW3: OFF Figure 6 Charge Cycle SW2: OFF SW1: ON VIN CPUMP=0.22 μF Current flow COUT=10 μF SW4: OFF SW3: ON Figure 7 Discharge Cycle 10 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series 3. Constant current output circuit The S-8813 Series features a three-channel constant current output circuit and enables driving of white LEDs in the current mode. In the case of the S-8813 Series, the constant current value can be controlled using one of the two following methods according to the product. In the case of the S-881300CPE, the desired constant current can be obtained with an external resistance value. Since a reference voltage of 1 V ±2% is output to the RISET pin, application of resistance R1 of 20 kΩ to 5.6 kΩ between the RISET pin and GND results in the flow of a constant current of 50 μA to 178 μA in the current setting resistance (R1) due to the I = V/R relationship. Amplifying this constant current 100 times and outputting it to IOUT1, IOUT2, and IOUT3 can obtain a constant current of between 5 mA to 17.8 mA/channel. 1 : 100 CPOUT VCPOUT= 5.0 V COUT=10 μF IOUT1 (IOUT1=5.0 mA to 17.8 mA) IOUT2 (IOUT2=5.0 mA to 17.8 mA) IOUT3 (IOUT3=5.0 mA to 17.8 mA) − + 1 V ±2% RISET R1=5.6 kΩ to 20 kΩ reference voltage Figure 8 Constant Current Circuit (S-881300CPE) On the other hand, a constant current of the desired value can also be obtained for the S-881300BPE by supplying the reference voltage to the VISET pin externally. Within the IC, a resistance of 10 kΩ is applied between the VISET pin and GND. The application of a reference voltage of between 0.5 V and 1.8 V to the VISET pin results in the flow of a current between 50 μA and 180 μA in the internal resistor (R2) due to the I = V/R relationship. Amplifying this constant current 100 times and outputting it to IOUT1, IOUT2, and IOUT3 can obtain a constant current of between 5 mA to 18 mA/channel. 1 : 100 CPOUT VCPOUT=5.0 V COUT=10 μF IOUT1 (IOUT1=5.0 mA to 17.8 mA) IOUT1 (IOUT1=5.0 mA to 17.8 mA) IOUT1 (IOUT1=5.0 mA to 17.8 mA) + − R2=10 kΩ VISET (VVISET=0.5 V to 1.8 V) Figure 9 Constant Current Circuit (S-881300BPE) Seiko Instruments Inc. 11 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series 4. ON/OFF Pin (Power Off Pin) Setting the ON/OFF pin to the Low level ("L") causes the voltage of the CPOUT pin to change to the GND potential and simultaneously the operation of all the internal circuit to stop. At this time, the consumption current is largely reduced, to a level of approximately 0.3 μA. VIN VIN ON/OFF ON/OFF Pin Oscillator Operating Stopped VCPOUT 5.0 V VSS Output Current Setting value 0 mA High level ("H") Low level ("L") VSS Figure 10 Equivalent Circuit of ON/OFF Pin 5. Soft Start Function The S-8813 Series features a built-in soft start circuit. Upon power application or when the ON/OFF pin is switched from "L" to "H", the output voltage gradually rises over the soft start time, and the output current is gradually output as a result. This soft start function reduces the input current rush. 6. External Capacitor Selection 6.1 Input and Output Capacitors (CIN, COUT) The input capacitor (CIN) lowers the power supply impedance and averages the input current, resulting in improved efficiency. The CIN value is selected according to the impedance of the power supply that is used. Select a ceramic capacitor with a small equivalent series resistance (ESR). Although this figure varies according to the impedance of the power supply that is used as well as the load current value, it is generally in the range of 4.7 μF to 10 μF. For the output capacitor (COUT), select a ceramic capacitor with a small ESR for smoothing the ripple voltage. A value of 10 μF is recommended for the capacitance value. Use of a capacitor with a capacitance lower than 10 μF results in a larger ripple voltage as well as a larger ripple current for the output current. Conversely, use of a capacitor with a capacitance greater than 10 μF results in the output voltage not being able to rise up to 5.0 V and the impossibility to obtain the desired output current. 6.2 Pump Capacitor (CPUMP) The pump capacitor (CPUMP) is required for stepping up the voltage. Select a ceramic capacitor with a small ESR. A capacitance value of 0.22 μF is recommended. Use of a capacitor with a capacitance greater than 0.22 μF results in a larger ripple voltage as well as a larger ripple current for the output current. Conversely, use of a capacitor with a capacitance lower than 0.22 μF results in the output voltage not being able to raise up to 5.0 V and the impossibility to obtain the desired output current. 12 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Application Circuit Examples 1. Variable Current Setting Resistance Type IOUT1 IOUT2 ON/ OFF Control signal White LED RISET S-881300 CPE CPOUT IOUT3 C+ VIN 1 0 μF 4.7 μF R1*1= 5.6 kΩ to 20 kΩ 0.22 μF C− GND Figure 11 Application Circuit 1 (S-881300CPE) VIN=3.0 V, Ta=25°C 30 25 IOUT [mA] R1=5.6 kΩ, VIN=3.0 V, Ta=25°C 19.0 18.5 IOUT [mA] VIOUT=3.0 V VIOUT =3.5 V 20 15 10 5 0 0 5 R1*1 10 [kΩ ] 15 20 VIOUT=4.0 V 18.0 17.5 17.0 16.5 16.0 3.00 3.25 3.50 VIOUT [V] 3.75 4.00 Figure 12 R1*1 Dependence (S-881300CPE) *1. Current setting resistance Figure 13 VIOUT Dependence (S-881300CPE) Seiko Instruments Inc. 13 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series 2. Variable Voltage Type IOUT1 IOUT2 ON/OFF Control signal White LED VISET S-881300 BPE CPOUT IOUT3 C+ VIN 10 μF 4.7 μF 0.5 to 1.8 V 0.22 μF C− GND Figure 14 Application Circuit 2 (S-881300BPE) VIN=3.0 V, Ta=25°C 25 20 IOUT [mA] VVISET=1.8 V, VIN=3.0 V, Ta=25°C, IOUT1 19.0 18.5 IOUT [mA] 18.0 17.5 17.0 16.5 16.0 VIOUT=3.0 V VIOUT=3.5 V VIOUT=4.0 V 15 10 5 0 0.0 0.5 1.0 1.5 2.0 2.5 3.00 3.25 3.50 VIOUT [V] 3.75 4.00 VVISET [V] Figure 15 VVISET Dependence (S-881300BPE) Figure 16 VIOUT Dependence (S-881300BPE) 14 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series 3. Regulating Luminance Circuit via PWM control signal (It corresponds only to S-881300CPE.) IOUT1 IOUT2 ON/ OFF Control signal R1 =5.6 kΩ to 20 kΩ *1 White LED RISET S-881300 CPE CPOUT IOUT3 C+ VIN PWM control signal 10 μF 4.7 μF 0.22 μF C− GND Figure 17 Application Circuit 3 (S-881300CPE) (1) When fPWM=1.0 kHz VIH=2.0 V, VIN=3.0 V, fPWM=1.0 kHz, Ta=25°C 20 16 IOUT [mA] R1*1=5.6 kΩ, RZ*2=0 Ω R1*1=20 kΩ, RZ*2=0 Ω VIH=2.0 V, R1*1=5.6 kΩ , RZ*2=0 Ω , fPWM=1.0 kHz, Ta=25°C 20 16 IOUT [mA] VIN=3.0 V VIN=3.5 V 12 12 8 4 0 0 20 40 60 80 100 0 0 20 40 PWM Duty Ratio [%] 8 4 VIN=4.5 V 60 80 100 PWM Duty Ratio [%] Figure 18 IOUT-PWM Duty Ratio Dependence 1 (R1*1 Dependence) Figure 19 IOUT-PWM Duty Ratio Dependence 1 (VIN Dependence) VIH=2.0 V, R1 =5.6 kΩ, RZ =0 Ω, VIN=3.0 V, fPWM=1.0 kHz *1 *2 VIH=2.0 V, R1*1=5.6 kΩ , RZ*2=0 Ω , VIN=3.0 V, Ta=25°C 20 16 IOUT [mA] fPWM=100 Hz fPWM=1.0 kHz 20 16 IOUT [mA] Temp.=−40°C Temp.=25°C Temp.=85°C 12 8 4 0 0 20 40 60 80 100 PWM Duty Ratio [%] 12 8 4 0 0 20 40 60 80 100 PWM Duty Ratio [%] Figure 20 IOUT-PWM Duty Ratio Dependence 1 (fPWM Dependence) Figure 21 IOUT-PWM Duty Ratio Dependence 1 (Temp. Dependence) *1. Current setting resistance *2. The output impedance of the PWM output control signal source when the PWM control signal is “L” Seiko Instruments Inc. 15 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series (2) When fPWM=20 kHz VIH=2.0 V, VIN=3.0 V, fPWM=20 kHz, Ta=25°C 20 16 IOUT [mA] 12 8 4 0 0 20 40 60 80 100 PWM Duty Ratio [%] R1 =5.6 kΩ, *1 20 RZ*2=0 Ω VIH=2.0 V, R1 =5.6 kΩ, RZ =0 Ω, fPWM=20 kHz, Ta=25°C *1 *2 16 IOUT [mA] 12 8 4 0 0 20 VIN=3.0 V VIN=3.5 V VIN=4.5 V R1*1=20 kΩ, RZ*2=0 Ω 40 60 80 100 PWM Duty Ratio [%] Figure 22 IOUT-PWM Duty Ratio Dependence 2 (R1*1 Dependence) VIH=2.0 V, R1 =5.6 kΩ, RZ =0 Ω, VIN=3.0 V, Ta=25°C *1 *2 Figure 23 IOUT-PWM Duty Ratio Dependence 2 (VIN Dependence) VIH=2.0 V, R1 =5.6 kΩ, RZ =0 Ω, VIN=3.0 V, fPWM=20 kHz *1 *2 20 fPWM=20 kHz 20 16 fPWM=10 kHz 16 IOUT [mA] IOUT [mA] Temp.=−40°C Temp.=25°C Temp.=85°C 12 8 4 0 0 20 40 60 80 100 PWM Duty Ratio [%] 12 8 4 0 0 20 40 60 80 100 PWM Duty Ratio [%] Figure 24 IOUT-PWM Duty Ratio Dependence 2 (fPWM Dependence) Figure 25 IOUT-PWM Duty Ratio Dependence 2 (Temp. Dependence) *1. Current setting resistance *2. The output impedance of the PWM output control signal source when the PWM control signal is “L” 16 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series VIH VIL TOFF T TON PWM Duty Ratio= TOFF T Figure 26 Wave Form Example of PWM Control signal PWM Control Signal Conditions: fPWM VP-P VIH VIL fPWM: VP-P: VIH: VIL: Min. 100 Hz 2.0 V 2.0 V 0V Typ. ⎯ ⎯ ⎯ ⎯ Max. 20 kHz 4.5 V 4.5 V 0V Pulse frequency Pulse amplitude Pulse input voltage (“H”) Pulse input voltage (“L”) Output Impedance of the PWM Output Control Signal Source (RZ): Max.500 Ω Calculation of IOUT According to PWM Duty Ratio: IOUT=1 V / (R1+RZ) × 100 × (1-Duty ratio) Ideally, when the duty ratio is 0%, IOUT value is the 100 times value of the RISET pin voltage (1 V) divided by the resistance of R1. However, the impedance from the RISET pin to the GND will serve as R1+RZ in actual operation. RZ means the output impedance of the PWM control signal source when the PWM control signal is low level. Therefore, the IOUT value varies depend on the RZ value. Caution 1. Fix the PWM output to low level during standby (when the ON/OFF pin is low level). If the PWM Output is set to high level, leak current will flow. 2. When the PWM duty is set to 100%, the current to the LED will be switched off. However, the IC will still keep operation. This is not the same as standby mode, and so the current consumption will be the same as in normal operation mode. 3. The duty ratio indicates the percentage of the high-level pulse width to one period. Seiko Instruments Inc. 17 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Precautions • Regarding the wiring to the VIN pin, CPOUT pin, C+ pin, C− pin and GND pin, be careful to perform pattern wiring so as to obtain low impedance. • Always connect a capacitor to the CPOUT pin, C+ pin, and C− pin. • Connect CIN and COUT in the vicinity of the IC and sufficiently strengthen the wiring for GND pin and VIN pin in order to lower the impedance of the wiring resistance, etc. High impedance may cause unstable operation. Moreover, in selecting CIN and COUT, perform a full evaluation of the actual usage conditions. • Connect CPUMP in the vicinity of the IC and sufficiently strengthen the wiring for the C+ pin and C− pin in order to lower the impedance of the wiring resistance, etc. High impedance may cause instable operation. Moreover, in selecting CPUMP, perform a full evaluation of the actual usage conditions. • The oscillation pulse width may be small with a light load; however, this causes problems in the IC operation. • The ON/OFF pin is configured as shown in Figure 10 and is neither pulled up or down internally, so do not use this pin in a floating state. When not using the ON/OFF pin, connect it to the VIN pin. Moreover, please do not impress voltage higher than VIN+0.3 V to an ON/OFF pin. Current flows for a VIN pin through the protection diode inside IC. • Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic protection circuit. • Be careful about the usage conditions for the input/output voltages and output current to make sure that dissipation within the IC does not exceed the allowable power dissipation of the package. For reference, the calculation of the power consumption in this IC is shown below. PD= (VIN ×2.0 −VIOUT1,2,3) × (IOUT1 +IOUT2 +IOUT3) Reference: VIN=4.2 V, VIOUT1,2,3=3.6 V, IOUT1,2,3=18 mA PD=(4.2 ×2.0 −3.6) ×0.054 =259 mW • The contents of this document are subject to change in order to reflect improvements made to the IC therein, so be sure to use the latest version of this document. • Seiko Instruments Inc. shall not be responsible for any patent infringements caused by products using the S-8813 Series in connection with the method in which the S-8813 Series is used in such products, the product specifications, or the country of destination. 18 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Major Temperature Characteristics Examples 1. Standby Consumption Current (ISSS) vs. Ambient Temperature (Ta) Characteristics 2. Power Off Pin Input Voltage "H" (VSH) vs. Ambient Temperature (Ta) Characteristics 1.0 0.8 ISSS [μA] VSH [V] 1.2 VIN= 4.5 V VIN= 4.5 V 1.0 0.8 0.6 VIN= 3.0 V 0.4 −40 −20 0 20 40 Ta [°C] 60 80 100 −40 −20 0 20 40 Ta [°C] 60 80 100 VIN= 3.0 V 0.6 0.4 0.2 0.0 3. Power Off Pin Input Voltage "L" (VSL) vs. Ambient Temperature (Ta) Characteristics 4. RISET Pin Voltage (VRISET) vs. Ambient Temperature (Ta) Characteristics 1.2 1.0 VRISET [V] VSL [V] 1.2 1.1 VIN= 4.5 V 1.0 0.9 0.8 −40 −20 0 20 40 Ta [°C] 60 80 100 −40 −20 0 20 40 Ta [°C] 60 80 100 VIN= 3.0 0.8 0.6 0.4 VIN= 4.5 V VIN= 3.0 V 5. Operation Consumption Current (ISS1) vs. Ambient Temperature (Ta) Characteristics 6. Ripple Voltage (VRIP) vs. Ambient Temperature (Ta) Characteristics R1=5.6 kΩ 1200 1100 1000 ISS1 [μA] 70 VIN= 4.5 V VRIP [mV] 60 50 40 30 20 10 0 −40 −20 8. VIN= 4.5 V 900 800 700 600 500 −40 −20 0 20 40 Ta [°C] 60 80 100 VIN= 3.0 V VIN= 3.0 V 0 20 40 60 80 100 Ta [°C] Soft Start Time (TSS) vs. Ambient Temperature (Ta) Characteristics 7. Maximum Oscillation Frequency (fOSC) vs. Ambient Temperature (Ta) Characteristics 700 650 fosc [kHz] 600 550 500 450 400 −40 −20 0 20 40 60 80 100 Ta [°C] VIN= 3.0 V VIN= 4.5 V TSS [ms] 2.5 2.0 1.5 1.0 0.5 0.0 −40 −20 0 20 40 VIN= 4.5 V VIN= 3.5 V R1=5.6 kΩ VIN= 2.7 V VIN= 3.0 V 60 80 100 Ta [°C] Seiko Instruments Inc. 19 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series 9. Stabilized Output Current (IOUT) vs. Ambient Temperature (Ta) Characteristics 10. Stabilized Output Current (IOUT) vs. Ambient Temperature (Ta) Characteristics 19.0 18.5 IOUT [mA] R1=5.6 kΩ, VIN=3.0 V 19.0 18.5 IOUT [mA] VISET=1.8 V, VIN=3.0 V 18.0 17.5 17.0 16.5 16.0 −40 −20 0 20 40 60 80 100 Ta [°C] VIOUT= 3.0 V VIOUT= 3.5 V VIOUT= 4.0 V 18.0 17.5 17.0 16.5 16.0 −40 −20 0 20 40 60 80 100 Ta [°C] VIOUT= 3.0 V VIOUT= 3.5 V VIOUT= 4.0 V 11. Inter-Pin Output Current Variation (ΔIM) vs. Ambient Temperature (Ta) Characteristics 1.0 0.8 ΔIM [%] VIOUT=3.5 V 0.6 0.4 0.2 0.0 −40 −20 0 20 40 Ta [°C] 60 80 100 VIN=3.0 V VIN=4.5 V 20 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Major Power Supply Dependence Characteristics Examples 1. Standby Consumption Current (ISSS) vs. Operation Input Voltage (VIN) Characteristics 2. Power-Off Pin Input Voltage "H" (VSH) vs. Operation Input Voltage (VIN) Characteristics 1.0 0.8 ISSS [μA] 1.2 Ta=−40°C Ta=25°C Ta=85°C 1.0 VSH [V] 0.6 0.4 0.2 0.0 2.0 2.5 0.8 0.6 0.4 2.0 Ta=−40°C Ta=25°C Ta=85°C 3.0 3.5 VIN [V] 4.0 4.5 5.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 3. Power-Off Pin Input Voltage "L" (VSL) vs. Operation Input Voltage (VIN) Characteristics 4. RISET Pin Voltage (VRISET) vs. Operation Input Voltage (VIN) Characteristics 1.2 1.1 1.2 1.0 VSL [V] VRISET [V] 0.8 0.6 Ta=−40°C Ta=25°C Ta=85°C Ta=−40°C Ta=25°C Ta=85°C 1.0 0.9 0.8 2.0 0.4 2.0 *1 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 5. Efficiency (η) vs. Operation Input Voltage (VIN) Characteristics 6. CPOUT Pin Voltage (VCPOUT) vs. Operation Input Voltage (VIN) Characteristics 100 80 Ta=25°C 6.0 5.5 VCPOUT [V] IOUT=18 mA/ch, Ta=25°C 5.0 4.5 4.0 3.5 3.0 2.0 2.5 3.0 Ta=−40°C Ta=25°C Ta=85°C η [%] 60 40 20 0 2.0 From the top IOUT=10 mA / ch IOUT=18 mA / ch IOUT=20 mA / ch 2.5 3.0 3.5 4.0 VIN [V] 4.5 5.0 3.5 4.0 VIN [V] 4.5 5.0 7. Operation Consumption Current (ISS1) vs. Operation Input Voltage (VIN) Characteristics 8. Ripple Voltage (VRIP) vs. Operation Input Voltage (VIN) Characteristics 1200 1100 1000 RISET=5.6 kΩ 70 60 50 VRIP [mV] ISS1 [μA] 900 800 700 600 Ta=−40°C Ta=25°C Ta=85°C 40 30 20 10 Ta=−40°C Ta=25°C Ta=85°C 500 2.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 0 2.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 Seiko Instruments Inc. 21 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series 9. Maximum Oscillation Frequency (fOSC) vs. Operation Input Voltage (VIN) Characteristics 10. Soft Start Time (tSS) vs. Operation Input Voltage (VIN) Characteristics 800 750 700 650 600 550 500 450 400 2.0 2.5 Ta=85°C Ta=25°C tSS [ms] 2.0 1.5 1.0 0.5 0.0 2.0 From the top Ta=85°C Ta=25°C Ta=−40°C 2.5 3.0 3.5 4.0 VIN [V] 4.5 5.0 Fosc [kHz] Ta=−40°C 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 11. Stabilized Output Current (IOUT) vs. Operation Input Voltage (VIN) Characteristics 12. Stabilized Output Current (IOUT) vs. Operation Input Voltage (VIN) Characteristics 20 19 IOUT [mA] R1=5.6 kΩ, Ta=25°C 20 19 IOUT [mA] VISET=1.8 V, Ta=25°C 18 17 16 15 2.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 VIOUT=3.0 V VIOUT=3.0 V VIOUT=4.0 V 18 17 16 15 2.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 VIOUT=3.0 V VOUT=3.5 V VOUT=4.0 V 13. Inter-Pin Output Current Variation (ΔIM) vs. Operation Input Voltage (VIN) Characteristics 1.0 0.8 [ %] ΔIM 0.6 0.4 0.2 0.0 Ta=85°C Ta=25°C Ta=−40°C 3.5 4.0 4.5 5.0 VIN [V] *1. “Efficiency” in the electrical characteristics means the efficiency of the charge pump circuit block. The ideal efficiency is indicated by the following expression. Efficiency =[ VCPOUT × (IOUT1 +IOUT2 +IOUT3) ] / [ 2.0 × VIN × (IOUT1 +IOUT2 +IOUT3) ] The ideal efficiency including the constant current circuit is expressed as following expression. Efficiency =[ (VIOUT1 ×IOUT1) + (VIOUT2 ×IOUT2) + (VIOUT3 ×IOUT3) ] / [ 2.0 ×VIN × (IOUT1 +IOUT2 +IOUT3) ] 2.0 2.5 3.0 22 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Major Load Characteristics Examples 1. Efficiency (η) vs. Stabilized Output Current (IOUT) Characteristics *1 2. CPOUT Pin Voltage (VCPOUT) vs. Stabilized Output Current (IOUT) Characteristics 100 VIN=2.7 V 80 60 40 20 0 1 10 IOUT [mA] VIN=3.0 V VIN=4.5 V Ta=25°C 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 0 10 20 30 VIN=3.0 V. Ta=25°C 100 VCPOUT [V] η [%] 40 50 60 70 IOUT [mA] *1. “Efficiency” in the electrical characteristics means the efficiency of the charge pump circuit block. The ideal efficiency is indicated by the following expression. Efficiency =[ VCPOUT × (IOUT1 +IOUT2 +IOUT3) ] / [ 2.0 × VIN ×(IOUT1 +IOUT2 +IOUT3) ] The ideal efficiency including the constant current circuit is expressed as following expression. Efficiency =[ (VIOUT1 ×IOUT1) +(VIOUT2 ×IOUT2) +(VIOUT3 ×IOUT3) ] / [ 2.0 ×VIN ×(IOUT1 +IOUT2 +IOUT3) ] Seiko Instruments Inc. 23 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Transient Response Characteristics Examples 1. Power-Off Pin Response VIN = 3.0 V Input Voltage [3 V / div] 0V VIOUT IOUT Pin Voltage [1 V / div] IOUT IOUT Pin Voltage [1 V / div] IOUT 3.0 V Input Voltage [3 V / div] 0V VIOUT 3.0 V 2. Power Supply Application VIN = 3.0 V Output Current [10 mA / div] t [500 μs / div] Output Current [10 mA / div] t [500 μs / div] 3. Power Supply Voltage Transition VIOUT = 3.5 V Input Voltage [1.5 V / div] Output Current [5 mA / div] 4.5 V 3.0 V 4. Power Supply Voltage Transition VIOUT = 3.5 V Input Voltage [1.5 V / div] Output Current [5 mA / div] 4.5 V 3.0 V t [200 μs / div] t [200 μs / div] 5. Current Setting Switching VIOUT = 3.5 V 10 kΩ R1 [5 kΩ / div] Output Current [5 mA / div] 5.1 kΩ 6. Current Setting Switching VIOUT = 3.5 V 10 kΩ R1 [5 kΩ / div] Output Current [5 mA / div] 5.1 kΩ t [200 μs / div] t [200 μs / div] 7. Ripple Characteristics (COUT 10 μF) 8. Ripple Characteristics (COUT 4.7 μF) 3.50 3.40 VIOUT [V] IOUT=10 mA/ch, VIN = 4.5 V 0.015 0.013 0.011 0.009 VIOUT [V] 3.50 3.40 IOUT = 10 mA/ch, VIN = 4.5 V 0.015 0.013 [A] 3.30 3.20 3.10 3.00 t [20 μs / div ] IOUT IOUT 3.30 3.20 3.10 3.00 0.011 0.009 [A] VIOUT 0.007 0.005 VIOUT 0.007 0.005 t [20 μs / div] 24 Seiko Instruments Inc. 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series 9. Ripple Characteristics (COUT 1.0 μF) 3.50 3.40 IOUT = 10 mA/ch, VIN = 4.5 V 0.015 0.013 IOUT VIOUT [V] [A] 3.30 3.20 3.10 3.00 t [20 μs / div] VIOUT 0.011 0.009 0.007 0.005 Seiko Instruments Inc. 25 10 6 1 5 (ø1.0) (2.3) No. PE010-A-P-SD-3.0 TITLE No. SCALE UNIT SON10B-A-PKG Dimensions PE010-A-P-SD-3.0 mm Seiko Instruments Inc. 4.0±0.1 2.0±0.05 ø1.55±0.05 1.5±0.1 0.2±0.05 3.3±0.1 4.0±0.1 ø1.05±0.05 5 1 6 10 Feed direction No. PE010-A-C-SD-1.1 TITLE No. SCALE UNIT SON10B-A-Carrier Tape PE010-A-C-SD-1.1 mm Seiko Instruments Inc. 11.4±1.0 (1.2) 3.0±0.2 9.0±0.3 Enlarged drawing in the central part No. PE010-A-R-SD-1.1 TITLE No. SCALE UNIT mm SON10B-A-Reel PE010-A-R-SD-1.1 QTY. 3000 Seiko Instruments Inc. • • • • • • The information described herein is subject to change without notice. Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. When the products described herein are regulated products subject to the Wassenaar Arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Seiko Instruments Inc. is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc. Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.