RT4801HWSC

RT4801H Dual Output LCD Bias for Smartphones and Tablets General Description Features The RT4801H is a highly integrated Boost and LDO and inverting charge pump to generate positive and negative output voltage. The output voltages can be adjusted from 4V to 6V with 100mV steps by I2C interface protocols. With its input voltage range of 2.5V to 5.5V, RT4801H is optimized for products powered by single-cell batteries and symmetrical output currents up to 80mA. The RT4801H is available in the WL-CSP15B 1.31x2.07 (BSC) package.           Ordering Information  RT4801H  Package Type WSC : WL-CSP-15B 1.31x2.07 (BSC)  Note :  Richtek products are :  RoHS compliant and compatible with the current  requirements of IPC/JEDEC J-STD-020.  2.5V to 5.5V Supply Voltage Range Up to 90% Efficiency with Small Magnetics Support Up to 80mA Output Current Low 1A Shutdown Current Internal Soft-start Function Short Circuit Protection Function Over-Voltage Protection Function Over-Current Protection Function Over-Temperature Protection Function Elastic Positive and Negative Voltage On/Off Control by ENP/ENN Voltage Output from 4V to 6V per 0.1V Low Input Noise and EMI Output with Programmable Fast Discharge when IC Shutdown Adjustable Output Voltage by I2C Compatible Interface Available in the 15-Ball WL-CSP Package Applications Suitable for use in SnPb or Pb-free soldering processes.  TFT-LCD Smartphones TFT-LCD Tablets  General Dual Power Supply Applications  Simplified Application Circuit L1 VIN VIN RT4801H CIN LXP VOP COP ENP VON CON ENN SCL BST SDA CF1 VOP VON CBST CF1 PGND Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 May 2016 GND CF2 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT4801H Marking Information Pin Configurations (TOP VIEW) ENN A1 ENP B1 A2 A3 CF2 B3 PGND C3 CF1 D3 BST E3 VOP 49W 49 : Product Code W : Date Code VON B2 SCL VIN C1 C2 SDA LXP D1 D2 GND PGND E1 E2 BST WL-CSP-15B 1.31x2.07 (BSC) Functional Pin Description Pin No. Pin Name Pin Function A1 ENN Enable Control Input for VON. A2 VON Negative Terminal Output. A3 CF2 Negative Charge Pump Flying Capacitor Pin. B1 ENP Enable Control Input for VOP. B2 SCL Clock of I2C. PGND Power Ground. C1 VIN Power Input. C2 SDA Data of I2C. C3 CF1 Negative Charge Pump Flying Capacitor Pin. D1 LXP Switching Node of Boost Converter. D2 GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. D3, E2 BST Output Voltage of Boost Converter. E3 VOP Positive Terminal Output. B3, E1 Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H Function Block Diagram BST LXP VIN UVLO OVP Bandgap Reference SCP1 VREF LDO VOP -1x Charge Pump CF1 P1 PWM Logic N1 GM + DAC RP2 OCP1 VREF RP1 Oscillator ENP ENN 2 VON I C SCL RN2 SDA PGND CF2 Soft-Start SCP2 - Fast Discharge VOP VON + DAC RN1 GND VREF Operation The RT4801H is a highly integrated Boost, LDO and inverting charge pump to generate positive and negative output voltages for LCD panel bias or consumer products. It can support input voltage range from 2.5V to 5.5V and the output current up to 80mA. Both positive and negative voltages can be programmed by a MCU through the dedicated I2C Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 May 2016 interface. The RT4801H provides Over-Temperature Protection (OTP) and Short Circuit Protection (SCP) mechanisms to prevent the device from damage with abnormal operations. When the EN voltage is logic low for more than 375s, the IC will be shut down with low input supply current less than 1A. is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT4801H Absolute Maximum Ratings (Note 1)  Supply Input Voltage VIN Pin --------------------------------------------------------------------------------------- 0.3V to 6V  Output Voltage VOP Pins-------------------------------------------------------------------------------------------- 0.3V to 7V  Output Voltage VON Pins ------------------------------------------------------------------------------------------- 7V to 0.3V  Others Pin to GND ---------------------------------------------------------------------------------------------------- 0.3V to 6V  Power Dissipation, PD @ TA = 25°C  WL-CSP-15B 1.31x2.07 (BSC) ----------------------------------------------------------------------------------- 2.00W Package Thermal Resistance (Note 2) WL-CSP-15B 1.31x2.07 (BSC), JA ----------------------------------------------------------------------------- 49.8°C/W  Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260C  Junction Temperature ----------------------------------------------------------------------------------------------- 150C  Storage Temperature Range -------------------------------------------------------------------------------------- 65C to 150C  ESD Susceptibility (Note 3) HBM (Human Body Model) ---------------------------------------------------------------------------------------- 2kV MM (Machine Model) ----------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 4)  Supply Input Voltage ------------------------------------------------------------------------------------------------- 2.5V to 5.5V  Ambient Temperature Range--------------------------------------------------------------------------------------- 40C to 85C  Junction Temperature Range -------------------------------------------------------------------------------------- 40C to 125C Electrical Characteristics (VIN = 3.7V, CIN = COP = CF1 = 4.7F, CBST = CON= 10F, L1 = 2.2H, TA = 25°C, unless otherwise specified.) Parameter Symbol Test Conditions Min Typ Max Unit 2.5 -- 5.5 V Power Supply Input Voltage Range VIN Under Voltage Lockout Threshold Voltage VUVLO_H VIN Rising -- -- 2.5 VUVLO_L VIN Falling -- -- 2.3 Over-Temperature Protection TOTP (Note 5) -- 140 -- °C Over-Temperature Protection Hysteresis TOTP_HYST (Note 5) -- 15 -- °C Shutdown Current ISHDN ENP = ENN = 0V -- -- 1 A V Boost Converter Boost Voltage Range VBST 4.15 -- 6.2 V Peak Current Limit IOCP -- 1 -- A Boost Switching Frequency fOSC_P 0.8 1 1.2 MHz Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H Parameter Symbol Test Conditions Min Typ Max Unit 6 V LDO Positive Output Voltage Range VOP Positive Output Voltage Setting VOP_SET Range 4 per step -- 100 -- mV Positive Output Voltage Accuracy VOP_ACC 1 -- 1 % Positive Output Current Capability IOP_MAX -- -- 80 mA Dropout Voltage VOP_DROP VBST = 5.4V, VOP = 5.4V, IOP = 100mA -- -- 150 mV Line Regulation VLINE_OP VIN = 2.5 to 5.5V, IOP = 40mA -- 2 -- mV Load Regulation VLOAD_OP IOP = 80mA -- 3 -- %/A Fast Discharge Resistance RDISP -- 70 --  Negative Output Voltage Range VON 4 -- 6 V Negative Output Voltage Setting Range VON_SET -- 100 -- mV Negative Output Voltage Accuracy VON_ACC 1 -- 1 % Negative Output Current Capability ION_MAX -- -- 80 mA Negative Charge Pump Switching Frequency fOSC_N 0.8 1 1.2 MHz Line Regulation VLINE_ON -- 10 -- mV Load Regulation VLOAD_ON ION = 80mA -- 6 -- %/A Fast Discharge Resistance RDISN -- 20 --  Negative Charge Pump per step VIN = 2.5 to 5.5V, ION = 40mA Logic Input (ENP, ENN, SCL, SDA) Input Threshold Voltage Logic-High VIH VIN =2.5V to 5.5V 1.2 -- -- Logic-Low VIL VIN =2.5V to 5.5V -- -- 0.4 -- 200 -- k -- 0.5 -- A ENP, ENN Pull-down Resistance REN SDA, SCL Sink Current IIH SDA, SCL Logic Input Voltage VSDA , VSCL = 3V Low-Level VSCL_L -- -- 0.4 High-Level VSCL_H 1.2 -- -- V V SCL Clock Frequency f CLK -- -- 400 kHz Output Fall Time tFL2COUT -- -- 250 ns Bus Free Time Between Stop/Start tBUF 1.3 -- -- s Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 May 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT4801H Parameter Symbol Test Conditions Min Typ Max Unit Hold Time Start Condition tHD,STA 0.6 -- -- s Setup Time for Start Condition tSU,STA 0.6 -- -- s SCL Low Time tLOW 1.3 -- -- s SCL High Time tHIGH 0.6 -- -- s Data Setup Time tSU,DAT 100 -- -- ns Data Hold Time tHD,DAT 0 -- 900 ns Setup Time for Stop Condition tSU,STO 0.6 -- -- s Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability. Note 2. JA is measured at TA = 25C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. JC is measured at the exposed pad of the package. Note 3. Devices are ESD sensitive. Handling precaution recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. TOTP, TOTP_HYST are guaranteed by design. Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H Typical Application Circuit L1 2.2μH VIN 2.5V to 5.5V CIN 4.7μF VIN RT4801H LXP VOP VON ENP COP 4.7μF CON 10μF VOP 4V to 6V VON -4V to -6V ENN BST SCL CF1 SDA CBST 10μF CF1 4.7μF CF2 PGND GND Table 1. Component List of Evaluation Board Reference Qty. Part Number Description Package Supplier CIN, COP, CF1 1 GRM188R61C475KAAJ 4.7F/16V/X5R 0603 Murata CBST, CON 1 GRM188R61C106KAAL 10F/16V/X5R 0603 Murata L1 1 1269AS-H-4R7N = P2 2.2H/130m 2.5mm x 2.0mm x 1.0mm Toko Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 May 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT4801H I2C Interface SDA VIH(MIN) VIL(MAX) tSU,DAT tLOW tHD,DAT tSU,STO tBUF tHIGH SCL VIH(MIN) VIL(MAX) tHD,STA tF S Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 P S is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H I2C Command Slave Address Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 = LSB 1 1 1 0 0 1 1 R/W Write Command (a) Write single byte of data to Register Slave Address Start 1 1 1 0 0 1 1 0 Register Address Data From Master Slave R7 R6 R5 R4 R3 R2 R1 R0 Slave D7 D6 D5 D4 D3 D2 D1 D0 Slave Stop ACK ACK ACK (b) Write multiple bytes of data to Registers Slave Address Start 1 1 1 0 0 1 Register Address nth nth Data From Master Slave Slave 0 R7 R6 R5 R4 R3 R2 R1 R0 D7 D6 D5 D4 D3 D2 D1 D0 Slave ACK ACK ACK 1 Last Data From Master (n + 1)th Data From Master D7 D6 D5 D4 D3 D2 D1 D0 Slave ACK D7 D6 D5 D4 D3 D2 D1 D0 Slave Stop ACK Read Command (a) Read single byte of data from Register Slave Address Start 1 1 1 0 0 Register Address 1 1 0 Slave D7 D6 D5 D4 D3 D2 D1 D0 Slave ACK ACK 1 1 Slave D7 D6 D5 D4 D3 D2 D1 D0 Master Stop ACK NACK Slave Address Restart 1 1 1 0 0 Data From Master 1 (b) Read multiple bytes of data from Registers Slave Address Start 1 1 1 0 0 1 Register Address 1 0 Slave D7 D6 D5 D4 D3 D2 D1 D0 Slave ACK ACK 1 Slave D7 D6 D5 D4 D3 D2 D1 D0 Master ACK ACK Slave Address Restart 1 1 1 0 0 1 nth Data From Master 1 Last Data From Master D7 D6 D5 D4 D3 D2 D1 D0 Master Stop NACK Start : Start command ACK : Acknowledge = L active R7 to R0 : Register Address. D7 to D0 : Write data when WRITE command or read VOP : Register address = 0X00h data when READ command VON : Register address = 0X01h Stop : Stop command DISP : Register address = 0x03h DISN : Register address = 0x03h APPS : Register address = 0x03h R/W : Read active (R/W = H) or Write active (R/W = L) Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 May 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT4801H Registers Map Table 2. VOP Voltage Selection Name Register DATA Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 VOP(V) VOP 00h 00h Reserved Reserved Reserved 0 0 0 0 0 4 VOP 00h 01h Reserved Reserved Reserved 0 0 0 0 1 4.1 VOP 00h 02h Reserved Reserved Reserved 0 0 0 1 0 4.2 VOP 00h 03h Reserved Reserved Reserved 0 0 0 1 1 4.3 VOP 00h 04h Reserved Reserved Reserved 0 0 1 0 0 4.4 VOP 00h 05h Reserved Reserved Reserved 0 0 1 0 1 4.5 VOP 00h 06h Reserved Reserved Reserved 0 0 1 1 0 4.6 VOP 00h 07h Reserved Reserved Reserved 0 0 1 1 1 4.7 VOP 00h 08h Reserved Reserved Reserved 0 1 0 0 0 4.8 VOP 00h 09h Reserved Reserved Reserved 0 1 0 0 1 4.9 VOP 00h 0Ah Reserved Reserved Reserved 0 1 0 1 0 5 VOP 00h 0Bh Reserved Reserved Reserved 0 1 0 1 1 5.1 VOP 00h 0Ch Reserved Reserved Reserved 0 1 1 0 0 5.2 VOP 00h 0Dh Reserved Reserved Reserved 0 1 1 0 1 5.3 VOP 00h 0Eh Reserved Reserved Reserved 0 1 1 1 0 5.4 VOP 00h 0Fh Reserved Reserved Reserved 0 1 1 1 1 5.5 VOP 00h 10h Reserved Reserved Reserved 1 0 0 0 0 5.6 VOP 00h 11h Reserved Reserved Reserved 1 0 0 0 1 5.7 VOP 00h 12h Reserved Reserved Reserved 1 0 0 1 0 5.8 VOP 00h 13h Reserved Reserved Reserved 1 0 0 1 1 5.9 VOP 00h 14h Reserved Reserved Reserved 1 0 1 0 0 6 Table 3. VON Voltage Selection Name Register DATA Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 VON(V) VON 01h 00h Reserved Reserved Reserved 0 0 0 0 0 -4 VON 01h 01h Reserved Reserved Reserved 0 0 0 0 1 -4.1 VON 01h 02h Reserved Reserved Reserved 0 0 0 1 0 -4.2 VON 01h 03h Reserved Reserved Reserved 0 0 0 1 1 -4.3 VON 01h 04h Reserved Reserved Reserved 0 0 1 0 0 -4.4 VON 01h 05h Reserved Reserved Reserved 0 0 1 0 1 -4.5 VON 01h 06h Reserved Reserved Reserved 0 0 1 1 0 -4.6 VON 01h 07h Reserved Reserved Reserved 0 0 1 1 1 -4.7 VON 01h 08h Reserved Reserved Reserved 0 1 0 0 0 -4.8 VON 01h 09h Reserved Reserved Reserved 0 1 0 0 1 -4.9 VON 01h 0Ah Reserved Reserved Reserved 0 1 0 1 0 -5 VON 01h 0Bh Reserved Reserved Reserved 0 1 0 1 1 -5.1 VON 01h 0Ch Reserved Reserved Reserved 0 1 1 0 0 -5.2 Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H Name Register DATA Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 VON(V) VON 01h 0Dh Reserved Reserved Reserved 0 1 1 0 1 -5.3 VON 01h 0Eh Reserved Reserved Reserved 0 1 1 1 0 -5.4 VON 01h 0Fh Reserved Reserved Reserved 0 1 1 1 1 -5.5 VON 01h 10h Reserved Reserved Reserved 1 0 0 0 0 -5.6 VON 01h 11h Reserved Reserved Reserved 1 0 0 0 1 -5.7 VON 01h 12h Reserved Reserved Reserved 1 0 0 1 0 -5.8 VON 01h 13h Reserved Reserved Reserved 1 0 0 1 1 -5.9 VON 01h 14h Reserved Reserved Reserved 1 0 1 0 0 -6 Table 4. VOP Active Discharge Name Register DATA Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 VOP Discharge DISP 03h 00h Reserved APPS Reserved Reserved Reserved Reserved 0 DISN W/O DISP 03h 02h Reserved APPS Reserved Reserved Reserved Reserved 1 DISN W Table 5. VON Active Discharge Name Register DATA Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 VON Discharge DISN 03h 00h Reserved APPS Reserved Reserved Reserved Reserved DISP 0 W/O DISN 03h 01h Reserved APPS Reserved Reserved Reserved Reserved DISP 1 W Table 6. Application Name Register DATA Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Application APPS 03h 00h Reserved 0 Reserved Reserved Reserved Reserved DISP DISN Tablet APPS 03h 40h Reserved 1 Reserved Reserved Reserved Reserved DISP DISN Smartphone The Reserved bits are ignored when written and return either 0 or 1 when read. Factory Default Register Value Name Register Address DATA VOP 00h 0Ah VON 01h 0Ah DISP 03h 43h DISN 03h 43h APPS 03h 43h Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 May 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RT4801H Typical Operating Characteristics Efficiency vs. Output Current VOP vs. Output Current 5.02 100 80 VIN = 4.5V 70 VIN = 3.7V 60 VIN = 2.9V 5.01 VOP (V) Efficiency (%) 90 50 40 5.00 VIN = 4.5V VIN = 3.7V 4.99 VIN = 2.9V 30 4.98 20 10 VOP = 5V, VON = 5V VOP = 5V 4.97 0 0 0.02 0.04 0.06 0 0.08 0.01 0.02 0.04 0.05 0.06 0.07 0.08 Output Current (A) Output Current (A) VON vs. Output Current VOP vs. Input Voltage -4.97 5.02 -4.98 5.01 -4.99 5.00 VOP (V) VON (V) 0.03 -5.00 IOP = 0A IOP = 40mA 4.99 IOP = 80mA VIN = 4.5V -5.01 4.98 VIN = 3.7V VIN = 2.9V VON = 5V -5.02 VOP = 5V 4.97 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 2.5 3 3.5 Output Current (A) 4.5 5 5.5 Input Voltage (V) VON vs. Input Voltage Shutdown Current vs. Temperature -4.97 0.20 VIN = 3.7V, EN = 0V 0.18 Shutdown Current (μA) -4.98 VON (V) 4 -4.99 -5.00 ION = 80mA -5.01 ION = 40mA ION = 0A VON = 5V -5.02 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 2.5 3 3.5 4 4.5 5 Input Voltage (V) Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 5.5 -40 -20 0 20 40 60 80 100 Temperature (°C) is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H Quiescent Current vs. Temperature Input Voltage vs. Temperature 2.30 1.2 2.28 2.26 1.0 Input Voltage (V) Quiescent Current (mA) 1.1 0.9 0.8 0.7 0.6 UVLO Rising 2.24 2.22 2.20 2.18 2.16 UVLO Falling 2.14 0.5 2.12 VIN = 3.7V 0.4 -40 -20 0 20 40 60 80 100 2.10 -40 0 20 40 60 Temperature (°C) Temperature (°C) VOP Ripple Voltage VOP Ripple Voltage 80 100 VOP (10mV/Div) VOP (10mV/Div) VIN = 3.7V, VOP = 5V, IOP = 0mA VIN = 3.7V, VOP = 5V, IOP = 20mA Time (1ms/Div) Time (1ms/Div) VOP Ripple Voltage VOP Ripple Voltage VOP (10mV/Div) VOP (10mV/Div) VIN = 3.7V, VOP = 5V, IOP = 40mA VIN = 3.7V, VOP = 5V, IOP = 80mA Time (1ms/Div) Time (1ms/Div) Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 -20 May 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 13 RT4801H VON Ripple Voltage VON (20mV/Div) VON Ripple Voltage VON (20mV/Div) VIN = 3.7V, VON = 5V, ION = 0mA Time (1ms/Div) Time (10s/Div) VON Ripple Voltage VON Ripple Voltage VON (20mV/Div) VOP (50mV/Div) VIN = 3.7V, VON = 5V, ION = 20mA VON (20mV/Div) VIN = 3.7V, VON = 5V, ION = 40mA VIN = 3.7V, VON = 5V, ION = 80mA Time (10s/Div) Time (10s/Div) Load Transient Load Transient VIN = 2.9V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 5m to 35mA VOP (50mV/Div) VON (50mV/Div) VON (50mV/Div) IOP (20mA/Div) IOP (50mA/Div) Time (100s/Div) Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 14 VIN = 2.9V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 10m to 70mA Time (100s/Div) is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H Load Transient VOP (50mV/Div) VIN = 3.7V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 5m to 35mA VON (50mV/Div) Load Transient VOP (50mV/Div) VIN = 3.7V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 10m to 70mA VON (50mV/Div) IOP (20mA/Div) IOP (50mA/Div) VOP (50mV/Div) Time (100s/Div) Time (100s/Div) Load Transient Load Transient VIN = 4.5V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 5m to 35mA VOP (50mV/Div) VON (50mV/Div) VON (50mV/Div) IOP (20mA/Div) IOP (50mA/Div) VIN = 4.5V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 10m to 70mA Time (100s/Div) Time (100s/Div) Line Transient Line Transient VIN = 2.9V to 3.4V, VOP = 5V, VON = 5V, IOPN = 5mA VIN VIN = 3.7V to 4.2V, VOP = 5V, VON = 5V, IOPN = 5mA VIN VOP (50mV/Div) VIN (1V/Div) VOP (50mV/Div) VIN (1V/Div) VON (50mV/Div) VON (50mV/Div) Time (500s/Div) Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 May 2016 Time (500s/Div) is a registered trademark of Richtek Technology Corporation. www.richtek.com 15 RT4801H Line Transient Line Transient VIN = 2.9V to 3.4V, VOP = 5V, VON = 5V, IOPN = 40mA VIN VIN = 3.7V to 4.2V, VOP = 5V, VON = 5V, IOPN = 40mA VIN VOP (50mV/Div) VIN (1V/Div) VOP (50mV/Div) VIN (1V/Div) VON (50mV/Div) VON (50mV/Div) Time (500s/Div) Time (500s/Div) Line Transient Line Transient VIN = 2.9V to 3.4V, VOP = 5V, VON = 5V, IOPN = 80mA VIN VIN = 3.7V to 4.2V, VOP = 5V, VON = 5V, IOPN = 80mA VIN VOP (50mV/Div) VIN (1V/Div) VOP (50mV/Div) VIN (1V/Div) VON (50mV/Div) VON (50mV/Div) Time (500s/Div) Time (500s/Div) Power On Power Off ENP (5V/Div) ENP (5V/Div) ENN (5V/Div) (5V/Div) VOP VON ENN (5V/Div) (5V/Div) VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENP/ENN On simultaneously IIN (200mA/Div) Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 16 VON IIN (200mA/Div) Time (1ms/Div) VOP VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENP/ENN Off simultaneously Time (1ms/Div) is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H Power On Power Off ENP (5V/Div) ENP (5V/Div) ENN (5V/Div) VOP (5V/Div) VON ENN (5V/Div) (5V/Div) VON VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENP prior ENN On VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENP prior ENN Off IIN (200mA/Div) IIN (200mA/Div) Time (1ms/Div) Time (1ms/Div) Power On Power Off ENP (5V/Div) ENP (5V/Div) ENN (5V/Div) ENN (5V/Div) VOP (5V/Div) VON (5V/Div) IIN (200mA/Div) VOP VON VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENN prior ENP On VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENN prior ENP Off IIN (200mA/Div) Time (1ms/Div) Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 VOP May 2016 Time (1ms/Div) is a registered trademark of Richtek Technology Corporation. www.richtek.com 17 RT4801H Application Information The RT4801H is a highly integrated Boost, LDO and inverting charge pump to generate positive and negative output voltages for LCD panel bias or consumer products. It can support input voltage range from 2.5V to 5.5V and the output current up to 80mA. The VOP positive output voltage is generated from the LDO supplied from a synchronous Boost converter, and VOP is set at a typical value of 5V. The Boost converter output also drives an inverting charge pump controller to generate VON negative output voltage which is set at a typical value of 5V. Both positive and negative voltages can be programmed by a MCU through the dedicated I2C interface and the available voltage range is from 4V to 6V with 100mV per step. Input Capacitor Selection Input ceramic capacitor with 4.7F capacitance is suggested for applications. For better voltage filtering, select ceramic capacitors with low ESR, X5R and X7R types are suitable because of their wider voltage and temperature ranges. Boost Inductor Selection The inductance depends on the maximum input current. As a general rule, the inductor ripple current range is 20% to 40% of the maximum input current. If 40% is selected as an example, the inductor ripple current can be calculated according to the following equations : VOUT  IOUT(MAX)   VIN IRIPPLE = 0.4  IIN(MAX) IIN(MAX) = where η is the efficiency of the VOP Boost converter, IIN(MAX) is the maximum input current, and IL is the inductor ripple current. The input peak current can then η   VIN    VOUT  VIN  2 L 0.4   VOUT   I OUT(MAX)fOSC 2 where f OSC is the switching frequency. For better system performance, a shielded inductor is preferred to avoid EMI problems. Boost Output Capacitor Selection The output ripple voltage is an important index for estimating IC performance. This portion consists of two parts. One is the product of ripple current with the ESR of the output capacitor, while the other part is formed by the charging and discharging process of the output capacitor. As shown in Figure 1, VOUT1 can be evaluated based on the ideal energy equalization. According to the definition of Q, the VOUT1 value can be calculated as the following equation : Q = IOUT  D  1 = COUT  VOUT1 fSOC IOUT  D VOUT1 = fSOC  COUT where f OSC is the switching frequency and D is the duty cycle. Finally, taking ESR into consideration, the overall output ripple voltage can be determined by the following equation : VOUT = VESR + VOUT1 = VSER + IOUT  D fOSC  COUT where VESR = ICrms x RCESR The output capacitor, COUT, should be selected accordingly. be obtained by adding the maximum input current with half of the inductor ripple current as shown in the following equation : IPEAK = 1.2 x IIN(MAX) Note that the saturated current of the inductor must be greater than IPEAK. The inductance can eventually be determined according to the following equation : Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 18 is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H Over Current Protection The RT4801H includes a cycle-by-cycle current limit function which monitors the inductor current during IL Input Current each ON period. The power switch will be forced off to avoid large current damage once the current is over the limit level. Inductor Current Short Circuit Protection Output Current Time DTs Output Ripple (ac) The RT4801H has an advanced output short-circuit protection mechanism which prevents the IC from damage by unexpected applications. VOP short to ground Time VOUT1 Figure 1. The Output Ripple Voltage without the Contribution of ESR Under Voltage Lockout To prevent abnormal operation of the IC in low voltage condition, an under voltage lockout is included which shuts down IC operation when input voltage is lower than the specified threshold voltage. Soft-Start The RT4801H employs an internal soft-start feature to avoid high inrush current during start-up. The soft-start function is achieved by clamping the output voltage of the internal error amplifier with another voltage source that is increased slowly from zero to near VIN during the soft-start period. When the output voltage is under the limit level with 1ms (typ.) duration, the LCD bias function enters shutdown mode and can only re-start to normal operation after triggering the ENP/ENN pin. VON short to ground The output will keep current limit status without shutdown and re-start to normal operation once short condition removed. Over Temperature Protection The RT4801H equips an over temperature protection circuitry to prevent overheating due to excessive power dissipation. The OTP will shut down LCD bias operation when ambient temperature exceeds 140°C. Once the ambient temperature cools down by approximately 15°C, IC will automatically resume normal operation. To maintain continuous operation, the maximum junction temperature should be prevented from rising above 125°C. Output Voltage Setting Thermal Considerations The output voltage of WL-CSP package can be programmed by a MCU through the dedicated I2C For continuous operation, do not exceed absolute maximum junction temperature. The maximum power interface according to the VOP/VON Voltage Selection Table. dissipation depends on the thermal resistance of the IC package, PCB layout, rate of surrounding airflow, and difference between junction and ambient temperature. The maximum power dissipation can be calculated by the following formula : Shutdown Delay and Discharge When the EN signal is logic low for more than 375s, the IC function will be shut down. The output VOP/VON can be actively discharged to GND via discharge selection bit enabled. In shutdown mode, the input supply current for the IC is less than 1A. PD(MAX) = (TJ(MAX)  TA) / JA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and JA is the junction to ambient thermal resistance. For recommended operating condition specifications, Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 May 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 19 RT4801H the maximum junction temperature is 125C. The junction to ambient thermal resistance, JA, is layout dependent. For WL-CSP-15B 1.31x2.07 (BSC) package, the thermal resistance, JA, is 49.8C/W on a standard JEDEC 51-7 four-layer thermal test board. The maximum power dissipation at TA = 25C can be calculated by the following formula : PD(MAX) = (125C  25C) / (49.8C/W) = 2W for WL-CSP-15B 1.31x2.07 (BSC) package The maximum power dissipation depends on the operating ambient temperature for fixed TJ(MAX) and thermal resistance, JA. The derating curve in Figure 2 allows the designer to see the effect of rising ambient Layout Considerations For the best performance of RT4801H, the following PCB layout guidelines should be strictly followed.  close to the IC as possible. The traces should be wide and short especially for the high current output loop.  The input and output bypass capacitor should be placed as close to the IC as possible and connected to the ground plane of the PCB.  The flying capacitor should be placed as close to the CF1/CF2 pin as possible to avoid noise injection.  temperature on the maximum power dissipation. For good regulation, place the power components as Minimize the size of the LXP node and keep the traces wide and short. Care should be taken to avoid Maximum Power Dissipation (W)1 3.0 running traces that carry any noise-sensitive signals Four-Layer PCB 2.5 near LXP or high-current traces.  2.0 Separate power ground (PGND) and analog ground (GND). Connect the GND and the PGND islands at a 1.5 single end. Make sure that there are no other 1.0 connections between these separate ground planes. 0.5 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 2. Derating Curve of Maximum Power Dissipation Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 20 is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 RT4801H ENN ENP SCL SDA VOP COP CIN ENN VBAT VON CF2 ENP SCL PGND VIN SDA LXP GND BST PGND BST VOP CF1 CF1 L1 CBST CON VON Figure 3. PCB Layout Guide Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS4801H-00 May 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 21 RT4801H Outline Dimension Dimensions In Millimeters Symbol Dimensions In Inches Min. Max. Min. Max. A 0.500 0.600 0.020 0.024 A1 0.170 0.230 0.007 0.009 b 0.240 0.300 0.009 0.012 D 2.020 2.120 0.080 0.083 D1 E 1.600 1.260 0.063 1.360 0.050 0.054 E1 0.800 0.031 e 0.400 0.016 WL-CSP-15B 1.31x2.07 (BSC) Richtek Technology Corporation 14F, No. 8, Tai Yuen 1st Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries. Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 22 is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016