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Technical content
Features
Input Voltage Range : 2.5V to 5.5V Adjustable Output Voltage : 2.1V to 5.2V by External Divided Resistors Up to 3A Maximum Load Capability for V IN = 3V, VOUT = 3.5V Up to 96% Efficiency OCP, OVP, OTP Protected Function 2MHz Switching Frequency 5μμμμμA Non-Switching Low Quiescent Maximizes Light Load Efficiency Forced PWM and Automatic PFM/PWM Mode Selection Output Fast Discharge Function Automatic / Seamless Step Up and Step Down Mode Transitions 25-Ball WL-CSP Package Marking Information 0K : Product Code YMDNN : Date Code Pin Configuration (TOP VIEW) WL-CSP-25B 2.07x2.33 (BSC) AVINPVINPVIN PVIN LX1 ENLX1 LX1 PGNDPGND PGND AGND LX2 LX2 AGND LX2 VOUT VOUT FBVOUT PVIN LX1 MODE LX2 VOUT RT6158H Package Type WSC : WL-CSP-25B 2.07x2.33 (BSC) 0K YM DNN
DS6158H-00 March 2017www.richtek.com ©Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. Typical Application Circuit Functional Pin Description Pin No. Pin Name Pin Function A1, A2, A3, A4 PVIN Power input supply. A5 AVIN Analog input supply. B1, B2, B3, B4 LX1 Phase 1. Switching node 1. Connect to inductor. B5 EN Chip enable. This input must not be left floating and must be terminated. C1, C2, C3 PGND Power ground. C4 MODE High for PFM mode, low for FCCM mode. This pin also can be used to synchronous switching frequency with 2.2MHz to 2.6MHz. This input must not be left floating and must be terminated. C5, D5 AGND Analog ground. D1, D2, D3, D4 LX2 Phase 2. Switching node 2. Connect to inductor. E1, E2, E3, E4 VOUT Output power. E5 FB Voltage feedback. BOM List Reference Description Manufacturer Package Parameter Typ Unit CIN 10 F/6.3V/X5R Murata – GRJ155R60J106ME11D 0402 C 10 F COUT 22 F/6.3V/X5R Murata – GRM188R60J226ME15D 0603 C 22 F CFF 56pF/50V/X5R Murata – GRM0335C1H560JA01D 0201 C 56 pF L1 1 H, ±20% DFE252010F – 1R0M = P02 2520 L 1 H DCR (Series R) 48 m Pull high voltage (For PFM operation) VOUT AGND VIN 2.5V to 5.5V PVIN CIN1 10µF x 2 RT6158H 1µH LX2 VOUT 2.1V to 5.2V EN PGND LX1 AVIN MODE FB A1, A2, A3, A4 B1, B2, B3, B4 C1, C2, C3C5, D5 D1, D2, D3, D4 E1, E2, E3, E4 100k CFF COUT 22µF x 21M 294k 56pF
DS6158H-00 March 2017 www.richtek.com ©Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. Functional Block Diagram Gate DRV VOUT AGND PWM Control VREF Digital Control LX2 PGND PVIN UVLO OCP FB EN LX1 MODE Rd DIS AVIN OVP OTPOSC DIS SCP -AMP A B C D Operation The RT6158H is a synchronous current mode constant on/off time (CMCOT) switching Buck-Boost converter designed to an adjustable output voltage from an input supply that can be above, equal, or below the output voltage. The inductor current is regulated by a fast current regulator which is controlled by a voltage control loop. The voltage error amplifier gets its feedback input from the FB pin. The output voltage of the RT6158H is adjustable, and can be set by the external divider resistor value. When VIN is greater than VOUT , the device operates in Buck mode. When VIN is lower than VOUT , the device operates in Boost mode. When VIN is close to VOUT, the RT6158H automatically enters Buck or Boost mode. In that case, the converter will maintain the regulation for output voltage and keep a minimum current ripple in the inductor to guarantee good performance.
DS6158H-00 March 2017www.richtek.com ©Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation.
Electrical Characteristics
(VIN = 3.6V, TA = 25°C, unless otherwise specified) 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) Parameter Symbol Test Conditions Min Typ Max Unit Input Power Source Input Voltage Range 2.5 -- 5.5 V Logic Input High Threshold V IH 1.2 -- -- V Logic Input Low Threshold V IL -- -- 0.4 V Under-Voltage Lockout V UVLO 2.05 -- 2.25 V Under-Voltage Lockout Hysteresis VUVLO_H -- 0.1 -- V Shutdown Current I SHDN V IN = 3.5V, EN = L -- -- 1 A Input Quiescent Current I QVIN Non-switching. VIN = 4.2V, VOUT = 3.5V, EN = VIN, Mode = VIN -- 5 7 A Switching Quiescent Current I QSW ILOAD = 0A. VIN = 4.2V, VOUT = 3.5V, EN = VIN, Mode = VIN -- 8 10 A Switching Frequency f SWCOT MODE = H, |V IN - VOUT| > 1V -- 2 -- MHz Switching Frequency f SWCCM MODE = L -- 2 -- MHz Synchronous Switching Frequency Range fSWSYNC MODE = square wave, 10% < duty
DS6158H-00 March 2017 www.richtek.com ©Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. 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. θ JA is measured under natural convection (still air) at T A = 25 °C with the component mounted on a high effective- thermal-conductivity four-layer test board on a JEDEC 51-7 thermal measurement standard. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Parameter Symbol Test Conditions Min Typ Max Unit Soft-Start Time tSS_EN Time from EN goes H to VOUT starts ramp up -- 1 -- ms tSS VIN = 4V, VOUT = 3.5V, ILOAD = 200mA -- 1 -- ms tSS VIN = 2.5V, VOUT = 3.5V, ILOAD = 200mA -- 2 -- ms Minimum Off Time t OFF_MIN -- 40 -- ns Minimum On Time t ON_MIN -- 40 -- ns FB Voltage CCM operation 0.792 0.8 0.808 V High Side Switch RDS(ON) R DS(ON)_A, D V OUT = 5V 12 20 30 m Low Side Switch RDS(ON) R DS(ON)_B, C V OUT = 5V 12 20 30 m Output Over-Voltage Protection VOVP 5.3 5.6 5.9 V Load Current Threshold, PFM to PWM ITH_PWM V IN = 3.6V, VOUT = 3.3V -- 200 -- mA Load Current Threshold, PWM to PFM ITH_PFM V IN = 3.6V, VOUT = 3.3V -- 200 -- mA FAULT Time T FAULT -- 40 -- ms Thermal Shutdown -- 160 -- °C Over-Temperature Protection Hysteresis TOTP_HYS -- 20 -- °C Inductor Peak Current Limit I CL 6 6.5 7 A Line Regulation VIN = 2.5V to 5.5V, V OUT = 3.5V, CCM, ILOAD = 1.5A -- 0.6 -- % Load Regulation VIN = 2.5V to 5.5V, VOUT = 3.5V, CCM operation, ILOAD < 3A -- 0.6 -- % Output Voltage Ripple V OUTp-to-p V IN = 2.5V to 5.5V, ILOAD > 1A -- 20 -- mV Line Transient V OUTp-to-p VIN = 3V to 3.6V at 10s, VOUT = 3.5V, ILOAD = 1A -- 100 -- mV Load Transient VIN = 3.4V, VOUT = 3.5V, Loading = 0.5A to 1A at 1s -- ±60 -- mV
DS6158H-00 March 2017www.richtek.com ©Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. Efficiency 100 Load Current (A) Efficiency (%) Typical Operating Characteristics Load Regulation -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 1 10 100 1000 10000 Output Current (mA) Regulation (%) Line Regulation 3.50V 3.52V 3.54V 3.56V 3.58V 3.60V 3.62V 3.64V Input Voltage (V) OutputVoltage (V) VOUT = 3.5V VOUT = 3.5V VOUT = 3.5V VIN = 4.2V VIN = 3.8V VIN = 3.5V VIN = 3.0V 4.2V 3.8V 3.5V 3.0V 0.1A 0.5A 1.5A 3.0A 0.0A Load Transient Time (75 μs/Div) VOUT Ripple Voltage Time (4ms/Div) VOUT (50mV/Div) VIN = 3V, VOUT = 3.5V, IOUT = 0A to 3A X = IOUT, Y = VOUT (50mV/Div) VOUT Ripple Voltage Time (4ms/Div) VIN = 4.5V, VOUT = 3.5V, IOUT = 0A to 3A VIN = 3.6V, VOUT = 3.5V, tR = tF = 1μs, IOUT = 0A to 3A LX1 (4V/Div) LX2 (5V/Div) IOUT (500mA/Div) VOUT (50mV/Div) LX1 (4V/Div) X = IOUT, Y = VOUT (50mV/Div) LX2 (5V/Div) IOUT (500mA/Div) VOUT (430mV/Div) IOUT (1A/Div)
DS6158H-00 March 2017 www.richtek.com ©Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. Switching Quiescent Current Input Voltage (V) Quiescent ( A) Maximum Output Current 2.6 2.9 3.2 3.5 3.8 4.1 4.4 Input Voltage (V) Maximum Output Ccrrent (A) VOUT = 3.5V VOUT = 3.5V Shutdown Current 0.0 0.2 0.4 0.6 0.8 1.0 Input Voltage (V) Quiescent ( A) VOUT = 3.5V, EN = 0 TC = 85°C TC = 25°C TC = −40°C μ Line Transient Time (200 μs/Div) Power Off Time (40 μs/Div) Power On Time (200 μs/Div) VIN = 3V to 3.6V, VOUT = 3.5V, IOUT = 1A VIN = 3.6V, VOUT = 3.5V, IOUT = 3A VIN = 3.6V, VOUT = 3.5V, IOUT = 3A VOUT (50mV/Div) VIN (500mV/Div) VOUT (1V/Div) VEN (2V/Div) ILX (1V/Div) VOUT (1V/Div) VEN (2V/Div) ILX (1V/Div)
DS6158H-00 March 2017www.richtek.com ©Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation.
Application Information
The RT6158H Buck-Boost DC-DC converter can operate with wide input voltage such as battery which is higher or lower than the output voltage and it can supply the load current up to 3A. The maximum peak current in the switches is limited to a typical value of 6.5A. The typical operating input voltage is between 2.5V and 5.5V. The RT6158H output voltage can be set from 2.1V to 5.2V by changing the external divider resistor on the FB pin. The converter feedback loop is internally compensated for both Buck and Boost operation and it provides seamless transition between Buck and Boost modes operation. Enable The device can be enabled or by the EN pin. When the EN pin is higher than the threshold of logic high, the device starts operation with soft-start. Once the EN pin is set at low, the device will be shut down. In shutdown mode, the converter stops switching, internal control circuitry is turned off, and the load is disconnected from the input. This also means that the output voltage can drop below the input voltage during shutdown. This input must not be left floating and must be terminated. Output Voltage Setting The RT6158H output voltage can be set from 2.1V to 5.2V by changing the external divider resistor on the FB pin. The resistor divider must be connected between VOUT, FB and GND. The typical value of the voltage at the FB pin is 800mV. For decrease the leakage current on FB pin, it is recommended to keep the resistor R2 large value. For example, it can be R1 = 1M Ω and R2 = 294k Ω for V OUT = 3.5V application, the following Equation is as below : OUT FB VR1 = R2 1 V MODE states and Synchronization The MODE pin can be used to select different operation modes. When MODE is set high, it means the RT6158H will operate at PFM mode for used to improve efficiency. At this point the converter operates with reduced switching frequency and with a minimum quiescent current to maintain high efficiency. When the load increases, the device will automatically switch to PWM mode. The PFM mode can be disabled by programming the MODE pin low. Connecting a clock signal at MODE pin can force the RT6158H switching frequency to synchronize to the connected clock frequency. The MODE pin input supports standard logic thresholds and the frequency range is between 2.2MHz to 2.6MHz. This input must not be left floating and must be terminated. Under-Voltage Lockout The under-voltage lockout circuit prevents the device from operating incorrectly at low input voltages. It prevents the converter from turning on the power switches under undefined conditions and prevents the battery from deep discharge. VIN voltage must be greater than 2.5V to enable the converter. During operation, if VIN voltage drops below 1.8V, the converter is disabled until the supply exceeds the UVLO rising threshold. The RT6158H automatically restarts if the input voltage recovers to the input voltage UVLO high level. Short Circuit Protection When the output is shorted to ground, the inductor current decays very slowly rate during a single switching cycle. A current runaway detector is used to monitor inductor current. As current increasing beyond the control of current loop, switching cycles will be skipped to prevent current runaway form occurring. Over-Temperature Protection The device has a built-in temperature sensor which monitors the internal junction temperature. If the temperature exceeds a threshold, the device stops operating. As soon as the IC temperature decreases below the threshold with a hysteresis, it starts operating again. Over-Voltage Protection When the VOUTS pin is floating, the device will trigger the over-voltage protection to avoid the output voltage exceeding critical values for device. In case it reaches the OVP threshold, the device will regulate the output voltage to this value.
DS6158H-00 March 2017 www.richtek.com ©Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. Protection Type Threshold Refer to Electrical spec. Protection Method Shut Down Delay Time Reset Method OCP I L > 6.5A Turn on B, D MOS CL will trigger right away. IL < 6.5A UVP V IN < 1.9V Shutdown 100 s V IN > 2.3V OTP TEMP > 160°C Shutdown No delay OTP Hysteresis = 20°C Output OVP V OUT > 5.6V Stop switching No delay V OUT < 5.3V SCP V OUT < 1.2V f SW become 1/4 No delay After FAULT 40ms Inductor Selection The recommended power inductor is 1μH with over 6.5A saturation current rating. In applications, need to select an inductor with the low DCR to provide good performance and efficiency. Input and Output Capacitor Selection The input and output capacitors should be ceramic X5R type with low ESL and ESR. The recommended input capacitor value is 2 x 10 μF. The recommended output capacitor value is 2 x 22μF. The output capacitor selection determines the output voltage ripple and transient response. It is recommended to use ceramic capacitors placed as close as possible to the VOUT and GND pins of the IC. If, for any reason, the application requires the use of large capacitors which cannot be placed close to the IC, using a small ceramic capacitor in parallel to the large one is recommended. This small capacitor should be placed as close as possible to the VOUT and GND pins of the IC. The output voltage ripple for a given output capacitor is expressed as follows: If the RT6158H operates in Buck mode, the worst-case voltage ripple occurs at the highest input voltage. When the Buck-boost operates in Boost mode, the worst-case voltage ripple occurs at the lowest input voltage. The maximum voltage of overshoot or undershoot, is inversely proportional to the value of the output capacitor. For surface mount applications, Taiyo Yuden or TDK ceramic capacitors, X7R series Multi-layer Ceramic Capacitor is recommended. A capacitor with a value in the range of the calculated minimum should be used. This is required to maintain control loop stability. There are no additional requirements regarding minimum ESR. Low ESR capacitors should be used to minimize output voltage ripple. Larger capacitors will cause lower output voltage ripple as well as lower output voltage drop during load transients. Thermal Considerations The junction temperature should never exceed the absolute maximum junction temperature T J(MAX), listed under Absolute Maximum Ratings, to avoid permanent damage to the device. The maximum allowable power dissipation depends on the thermal resistance of the IC package, the PCB layout, the rate of surrounding airflow, and the difference between the junction and ambient temperatures. The maximum power dissipation can be calculated using the following formula : P D(MAX) = (TJ(MAX) − TA) / θJA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. For continuous operation, the maximum operating junction temperature indicated under Recommended Operating Conditions is 125 °C. The junction-to-ambient thermal resistance, θ JA, is highly package dependent. For a WL- CSP-25B 2.07x2.33 (BSC) package, the thermal resistance, θ JA, is 35.7°C/W on a standard JEDEC 51-7 high effective-thermal-conductivity four-layer test board. The maximum power dissipation at T A = 25 °C can be calculated as below : PD(MAX) = (125°C − 25°C) / (35.7°C/W) = 2.8W for a WL- CSP-25B 2.07x2.33 (BSC) package. The maximum power dissipation depends on the operating ambient temperature for the fixed TJ(MAX) and the thermal resistance, θJA. The derating curves in Figure 1 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation.
DS6158H-00 March 2017 www.richtek.com ©Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. Outline Dimension 25B WL-CSP 2.07x2.33 Package (BSC) 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 2.280 2.380 0.090 0.094 E 2.020 2.120 0.080 0.083 e 1.600 0.063 0.400 0.016 Symbol Dimensions In Millimeters Dimensions In Inches 1.600 0.063
DS6158H-00 March 2017www.richtek.com 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 ci rcuitry entirely embodied in a Richtek product. Information furnish ed by Richtek is believed to be accurate and reliable. However, no respon sibility is assumed by Richtek or its subsidiaries for its use; nor for any infringeme nts 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 R ichtek or its subsidiaries. Footprint Information eAB NSMD 0.240 0.340 SMD 0.270 0.240 Tolerance Footprint Dimension (mm) Package Number of Pin Type