RT4801H RICHTEK | Alldatasheet
Document overview
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Technical content
Features
2.5V to 5.5V Supply Voltage Range Up to 90% Efficiency with Small Magnetics Support Up to 80mA Output Current Low 1A 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 I 2C Compatible Interface Available in the 15-Ball WL-CSP Package
Applications
TFT-LCD Smartphones TFT-LCD Tablets General Dual Power Supply Applications Simplified Application Circuit VOPVIN RT4801H LXP GND CIN PGND ENP VIN COP VOP CF1 CF2 CF1 VON CON VON SCL SDA ENN BST CBST
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS4801H-00 May 2016 Pin Configurations (TOP VIEW) VIN PGND CF1 BST VOP LXP VON GND BST ENN CF2 PGNDENP SCL SDA C1 C2 C3 D3D1 E1 E2 E3 A1 A2 A3 B3B1 B2 WL-CSP-15B 1.31x2.07 (BSC) Marking Information 49 : Product Code W : Date Code 49W 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. B3, E1 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.
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 www.richtek.com Function Block Diagram SCP1 RP2 RP1 VOP CF2 VIN ENP GND PGND LXP PWM Logic UVLO OCP1 RN2 RN1 SCP2 VON DAC+ Oscillator I2C VREF Bandgap Reference -1x Charge Pump CF1 Soft-StartENN SCL LDO GM VREF DAC SDA VREF Fast Discharge VOP VON BST OVP 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 posi tive and negative voltages can be programmed by a MCU through the dedicated I 2C 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 375s, the IC will be shut down with low input supply current less than 1A.
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS4801H-00 May 2016 Absolute Maximum Ratings (Note 1) Power Dissipation, PD @ TA = 25°C Package Thermal Resistance (Note 2) ESD Susceptibility (Note 3) Recommended Operating Conditions (Note 4)
Electrical Characteristics
(VIN = 3.7V, CIN = COP = CF1 = 4.7F , CBST = CON= 10F, L1 = 2.2H, TA = 25°C, unless otherwise specified.) Parameter Symbol Test Conditions Min Typ Max Unit Power Supply Input Voltage Range VIN 2.5 -- 5.5 V Under Voltage Lockout Threshold Voltage VUVLO_H VIN Rising -- -- 2.5 V 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 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. is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 www.richtek.com Parameter Symbol Test Conditions Min Typ Max Unit LDO Positive Output Voltage Range VOP 4 6 V Positive Output Voltage Setting Range VOP_SET 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 Charge Pump Negative Output Voltage Range VON 4 -- 6 V Negative Output Voltage Setting Range VON_SET per step -- 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 VIN = 2.5 to 5.5V, ION = 40mA -- 10 -- mV Load Regulation VLOAD_ON ION = 80mA -- 6 -- %/A Fast Discharge Resistance RDISN -- 20 -- Logic Input (ENP, ENN, SCL, SDA) Input Threshold Voltage Logic-High VIH VIN =2.5V to 5.5V 1.2 -- -- V Logic-Low VIL VIN =2.5V to 5.5V -- -- 0.4 ENP, ENN Pull-down Resistance REN -- 200 -- k SDA, SCL Sink Current IIH VSDA , VSCL = 3V -- 0.5 -- A SDA, SCL Logic Input Voltage Low-Level VSCL_L -- -- 0.4 V High-Level VSCL_H 1.2 -- -- SCL Clock Frequency fCLK -- -- 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. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS4801H-00 May 2016 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 n ot implied. Exposure to absolute maximum rating conditions may affect device reliability. Note 2. JA is measured at T A = 25C 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. is a registered trademark of Richtek Technology Corporation. Table 1. Component List of Evaluation Board
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS4801H-00 May 2016 I2C Interface SDA SCL VIH(MIN) VIL(MAX) VIH(MIN) VIL(MAX) tSU,DAT tLOW tHIGH tHD,STA S tF tHD,DAT tSU,STO tBUF P S
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 www.richtek.com 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 1 1 1 0 0 1 1 0 Slave ACK Slave Address Register Address R7 R6 R3R5 R4 R2 R1 R0 Slave ACK Data From Master Start Slave ACK StopD7 D6 D5 D4 D3 D2 D1 D0 (b) Write multiple bytes of data to Registers 1 1 1 0 0 1 1 0 Slave ACK Slave Address Register Address nth Slave ACK nth Data From Master Start D7 D6 D5 D4 D3 D2 D1 D0 Slave ACK Slave ACK Stop (n + 1)th Data From Master Last Data From Master R7 R6 R3R5 R4 R2 R1 R0 D7 D6 D5 D4 D3 D2 D1 D0 Slave ACKD7 D6 D5 D4 D3 D2 D1 D0 Read Command (a) Read single byte of data from Register 1 1 1 0 0 1 1 0 Slave ACK Slave Address Register Address 1 1 1 0 0 1 1 1 Slave ACK Slave Address Data From Master Re- start Start Slave ACKD7 D6 D5 D4 D3 D2 D1 D0 Master NACK StopD7 D6 D5 D4 D3 D2 D1 D0 (b) Read multiple bytes of data from Registers 1 1 1 0 0 1 1 0 Slave ACK 1 1 1 0 0 1 1 1 Slave ACK Slave Address nth Data From Master Master ACK Re- start Start Slave Address Register Address Master NACK Stop Last Data From Master D7 D6 D5 D4 D3 D2 D1 D0 Slave ACKD7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 Start : Start command R7 to R0 : Register Address. VOP : Register address = 0X00h VON : Register address = 0X01h 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) ACK : Acknowledge = L active D7 to D0 : Write data when WRITE command or read data when READ command Stop : Stop command
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Table 2. VOP Voltage Selection Table 3. VON Voltage Selection
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Table 4. VOP Active Discharge Table 5. VON Active Discharge Table 6. Application The Reserved bits are ignored when written and return either 0 or 1 when read.
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS4801H-00 May 2016 Typical Operating Characteristics Efficiency vs. Output Current 100 0 0.02 0.04 0.06 0.08 Output Current (A) Efficiency (%) VOP = 5V, VON = 5V VIN = 4.5V VIN = 3.7V VIN = 2.9V VOP vs. Output Current 4.97 4.98 4.99 5.00 5.01 5.02 Output Current (A) VOP (V) VOP = 5V VIN = 4.5V VIN = 3.7V VIN = 2.9V VON vs. Output Current -5.02 -5.01 -5.00 -4.99 -4.98 -4.97 Output Current (A) VON (V) VON = 5V VIN = 4.5V VIN = 3.7V VIN = 2.9V VOP vs. Input Voltage 4.97 4.98 4.99 5.00 5.01 5.02 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) VOP (V) VOP = 5V IOP = 0A IOP = 40mA IOP = 80mA VON vs. Input Voltage -5.02 -5.01 -5.00 -4.99 -4.98 -4.97 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) VON (V) VON = 5V ION = 80mA ION = 40mA ION = 0A Shutdown Current vs. Temperature 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 -40 -20 0 20 40 60 80 100 Temperature (°C) Shutdown Current (μA) VIN = 3.7V, EN = 0V
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 www.richtek.com Quiescent Current vs. Temperature 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 -40 -20 0 20 40 60 80 100 Temperature (°C) Quiescent Current (mA) VIN = 3.7V Input Voltage vs. Temperature 2.10 2.12 2.14 2.16 2.18 2.20 2.22 2.24 2.26 2.28 2.30 -40 -20 0 20 40 60 80 100 Temperature (°C) Input Voltage (V) UVLO Rising UVLO Falling VIN = 3.7V, VOP = 5V, IOP = 0mA VOP (10mV/Div) Time (1ms/Div) VOP Ripple Voltage VOP (10mV/Div) Time (1ms/Div) VOP Ripple Voltage VIN = 3.7V, VOP = 5V, IOP = 20mA VOP (10mV/Div) Time (1ms/Div) VOP Ripple Voltage VIN = 3.7V, VOP = 5V, IOP = 40mA VOP (10mV/Div) Time (1ms/Div) VOP Ripple Voltage VIN = 3.7V, VOP = 5V, IOP = 80mA
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS4801H-00 May 2016 VON (20mV/Div) Time (1ms/Div) VON Ripple Voltage VIN = 3.7V, VON = 5V, ION = 0mA VON (20mV/Div) Time (10s/Div) VON Ripple Voltage VIN = 3.7V, VON = 5V, ION = 20mA VON (20mV/Div) Time (10s/Div) VON Ripple Voltage VIN = 3.7V, VON = 5V, ION = 40mA VON (20mV/Div) Time (10s/Div) VON Ripple Voltage VIN = 3.7V, VON = 5V, ION = 80mA VIN = 2.9V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 5m to 35mA VOP (50mV/Div) VON (50mV/Div) IOP (20mA/Div) Time (100s/Div) Load Transient VIN = 2.9V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 10m to 70mA VOP (50mV/Div) VON (50mV/Div) IOP (50mA/Div) Time (100s/Div) Load Transient
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 www.richtek.com VIN = 3.7V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 5m to 35mA VOP (50mV/Div) VON (50mV/Div) IOP (20mA/Div) Time (100s/Div) Load Transient VIN = 3.7V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 10m to 70mA VOP (50mV/Div) VON (50mV/Div) IOP (50mA/Div) Time (100s/Div) Load Transient VIN = 4.5V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 5m to 35mA VOP (50mV/Div) VON (50mV/Div) IOP (20mA/Div) Time (100s/Div) Load Transient VIN = 4.5V, VOP = 5V, VON = 5V, TR = TF = 10s, IOPN = 10m to 70mA VOP (50mV/Div) VON (50mV/Div) IOP (50mA/Div) Time (100s/Div) Load Transient VIN = 2.9V to 3.4V, VOP = 5V, VON = 5V, IOPN = 5mA VIN (1V/Div) VOP (50mV/Div) VON (50mV/Div) Time (500s/Div) Line Transient VIN VIN = 3.7V to 4.2V, VOP = 5V, VON = 5V, IOPN = 5mA VOP (50mV/Div) VIN (1V/Div) VON (50mV/Div) Time (500s/Div) Line Transient VIN
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS4801H-00 May 2016 VIN = 2.9V to 3.4V, VOP = 5V, VON = 5V, IOPN = 40mA VOP (50mV/Div) VIN (1V/Div) VON (50mV/Div) Time (500s/Div) Line Transient VIN VIN = 3.7V to 4.2V, VOP = 5V, VON = 5V, IOPN = 40mA VOP (50mV/Div) VIN (1V/Div) VON (50mV/Div) Time (500s/Div) Line Transient VIN VIN = 2.9V to 3.4V, VOP = 5V, VON = 5V, IOPN = 80mA VOP (50mV/Div) VIN (1V/Div) VON (50mV/Div) Time (500s/Div) Line Transient VIN VIN = 3.7V to 4.2V, VOP = 5V, VON = 5V, IOPN = 80mA VOP (50mV/Div) VIN (1V/Div) VON (50mV/Div) Time (500s/Div) Line Transient VIN VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENP/ENN On simultaneously ENP (5V/Div) ENN (5V/Div) (5V/Div) IIN (200mA/Div) Time (1ms/Div) Power On VOP VON VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENP/ENN Off simultaneously ENP (5V/Div) ENN (5V/Div) (5V/Div) IIN (200mA/Div) Time (1ms/Div) Power Off VOP VON
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS4801H-00 May 2016 www.richtek.com VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENP prior ENN On ENP (5V/Div) ENN (5V/Div) (5V/Div) IIN (200mA/Div) Time (1ms/Div) Power On VOP VON VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENP prior ENN Off ENP (5V/Div) ENN (5V/Div) (5V/Div) IIN (200mA/Div) Time (1ms/Div) Power Off VOP VON VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENN prior ENP On ENP (5V/Div) ENN (5V/Div) (5V/Div) IIN (200mA/Div) Time (1ms/Div) Power On VOP VON VIN = 3.7V, VOP = 5V, VON = 5V, No Load, ENN prior ENP Off ENP (5V/Div) ENN (5V/Div) (5V/Div) IIN (200mA/Div) Time (1ms/Div) Power Off VOP VON
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS4801H-00 May 2016
Application Information
The RT 4801H 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 V OP 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 capacito r 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 : OUT OUT(MAX) IN(MAX) IN RIPPLE IN(MAX) VII = V I = 0.4 I 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 be obtained by adding the maximum input current with half of the i nductor 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 : IN OUT IN OUT OUT(MAX) OSC η V V VL
0.4 V I f
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 pro cess 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 : OUT OUT OUT1 SOC OUTOUT1 SOC OUT 1Q = I D = C Vf IDV = fC where fOSC 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 : OUTOUT ESR OUT1 SER OSC OUT IDV = V + V = V + fC where VESR = ICrms x RCESR The output capacitor, C OUT, should be selected accordingly.
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Figure 1. The Output Ripple Voltage without the than the specified threshold voltage. supply current for the IC is less than 1A. damage by unexpected applications. operation after triggering the ENP/ENN pin. difference between junction and ambient temperature.
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. standard JEDEC 51 -7 four -layer thermal test board. temperature on the maximum power dissipation. Figure 2. Derating Curve of Maximum Power PCB layout guidelines should be strictly followed. and short especially for the high current output loop. to the ground plane of the PCB. CF1/CF2 pin as possible to avoid noise injection. near LXP or high-current traces. connections between these separate ground planes.
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Figure 3. PCB Layout Guide
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS4801H-00 May 2016 Outline Dimension Symbol Dimensions In Millimeters 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 1.600 0.063 E 1.260 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 witho ut 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.