RAA211803 RENESAS
Document overview
- Manufacturer or author: Provided By www.digicamel.com(free datasheet download site)
- PDF pages: 25
Technical content
Datasheet sections
- 1.1 Block Diagram
- 1.2 Typical Applications
- 2.1 Pin Assignments
- 2.2 Pin Descriptions
- 3.1 Absolute Maximum Ratin gs
- 3.2 Recommended Operating Con ditions
- 3.3 Thermal Specifications
- 3.4 Electrical Specifications
- 5.1 Peak Current and Propagation Delay
- 5.2 Soft-Start
- 5.3 Undervoltage Lockout
- 5.4 Enable Control
- 5.5 Overcurrent Protection (OCP)
- 5.6 Short Circuit
- 5.7 V OUT Overvoltage Protection (OVP)
- 5.8 Pre-Baised Output Voltage
- 5.9 Over-Temperature Protection (OTP)
- 5.10 Switching Frequency
- 5.11 Fault Summary
- 6.1 Input Capacitor
- 6.2 Output Capacitor
- 6.3 Inductor
- 6.4 Diode
Features
▪ 7V to 80V input supply range ▪ Up to 300mA output current Q = 5.5µA at 80V, at no load conditions, switching ▪I Q = 4.5µA at 80V at no load and no switching conditions ▪ RAA211803 is fixed 3.3V VOUT, RAA211805 is fixed 5V VOUT ▪ Minimum on-time of 75ns ▪ Variable frequency operation, frequency programmed by external inductor (10µH to 33µH) ▪ Pre-bias, monotonic, and smooth start-up ▪ Protections: Overcurrent (OC) Limit, input Undervoltage Lockout (UVLO), Over-Temperature Protection (OTP), output Overvoltage Protection (OVP) ▪ Accurate EN threshold ▪ Package: TSOT23-5 (2.9mm×1.63mm) Programmable Features ▪ Inductor: Change switching frequency ▪ Enable: Turn on/off with external logic or connect EN to V IN Figure 1. Typical Application Circuit
1.1 Block Diagram
Figure 2. Block Diagram
1.2 Typical Applications
Figure 3. Typical Application Circuit (RAA211803) Table 1. Typical BOM for RAA211803
Figure 4. Typical Application Circuit (RAA211805) Table 2. Typical BOM for RAA211805
R16DS0339EU0100 Rev.1.00 Page 6 Oct 2, 2023 RAA211803, RAA211805 Datasheet 2. Pin Information
2.1 Pin Assignments
2.2 Pin Descriptions
Pin Number Pin Name Description 1V O U T Connect this pin to the output voltage of the regulator. This pin is also the bias supply for the IC after the device starts up and is in regulation. 2 GND Ground connection pin. 3E N The enable pin: It is high voltage tolerant; therefore, it can be directly connected to VIN or a logic voltage for enable and disable. Do not leave this pin floating. 4V I N Voltage input for the IC. The VIN pin is connected to the integrated MOSFET source and to a suitable voltage source within the IC operation range to this pin. 5S W Switch node pin. This pin is the phase node of the regulator and is connected to the drain of the integrated MOSFET. Connect this pin to the inductor and diode. SW EN VOUT VIN GND
R16DS0339EU0100 Rev.1.00 Page 7 Oct 2, 2023 RAA211803, RAA211805 Datasheet 3. Specifications
3.1 Absolute Maximum Ratings
Caution: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely impact product reliability and result in failures not covered by warranty.
3.2 Recommended Operating Conditions
3.3 Thermal Specifications
Parameter Minimum Maximum Unit VIN -0.3 84 V EN -0.3 V IN + 0.3 V SW -0.3 V IN + 0.3 V VOUT -0.3 7 V SW, 20ns Transient -6 V IN + 0.3 V Maximum Operating Junction Temperature -40 150 °C Maximum Storage Temperature Range -65 150 °C Human Body Model (Tested per JS-001-2017) - 2 kV Charged Device Model (Tested per JS-002-2018) - 1 kV Latch-Up (Tested per JESD78E; Class 2, Level A) - 100 mA Parameter Minimum Maximum Unit Input Voltage, V IN 78 0 V Output Current, IOUT 00 . 3 A Junction Temperature, TJ -40 +125 °C Parameter Package Symbol Conditions Typical Value Unit Thermal Resistance TSOT23-5 θJA[1] 1. θ JA is measured in free air with the component mounted on RTKA211803DE0000BU/RTKA211805DE0000BU evaluation board. Junction to ambient 85 °C/W θJA[2] 2. θ JA is measured in free air with the component mounted on a high-effective thermal conductivity test board. See TB379. Junction to ambient 155 °C/W θJC[3] 3. For θ JC, the case temperature location is the center of the package top surface. Junction to case 58 °C/W
R16DS0339EU0100 Rev.1.00 Page 8 Oct 2, 2023 RAA211803, RAA211805 Datasheet
3.4 Electrical Specifications
TJ = -40°C to +125°C, VIN = 7V to 80V, unless otherwise noted. Typical values are at TA = +25°C. Boldface limits apply across the junction temperature range, -40°C to +125°C. Parameter Symbol Test Conditions Min [1] 1. Parameters with MIN and/or MAX limits are 100% tested at +25° C, unless otherwise specified. Temperature limits established by characterization and are not production tested. Typ Max [1] Unit Supply Voltage VIN Voltage Range V IN - 7 18 80 V VIN Quiescent Current I Q EN = VIN = 80V, VOUT = 3.3V or 5V, no load operation, switching -5 . 5-µ A EN = VIN = 80V, VOUT > 3.3V or 5V, no load, no switching -4 . 5-µ A Shutdown Current (Typ/Max) I SH EN = 0V, VIN = 24, no switching - 0.3 2 µA VIN Undervoltage Lockout - V IN rising 6 6.5 7 V VIN Undervoltage Hysteresis - - 550 - mV Output Voltage VOUT Valley Comparator Threshold VOUT RAA211803, VIN = 12V, no load 3.18 3.3 3.42 V RAA211805, VIN = 12V, no load 4.75 4.95 5.15 V Overvoltage Protection OVP RAA211803 - 3.63 - V RAA211805 - 5.5 - V Enable Voltage EN High Level Input Voltage V ENH - 2.44 2.55 2.7 V EN Hysteresis - - - 110 - mV EN Leakage Current - EN = V IN = 80V - 0 - µA Timer Control Minimum On-Time t ON_MIN VIN = 20V - 75 - ns Internal Integrated MOSFETs On Resistance r DS(ON)_H VIN = 12V - 2.9 - Ω Current Limit and Protection Current Limit I LIM VIN = 12V - 0.75 - A Current Limit Prop Delay - - - 50 - ns Thermal Shutdown TSD - - 160 - °C Thermal Hysteresis ∆TSD - - 20 - °C
voltage range of 7V to 80V across the -40°C to 125°C junction temperature range. current reference to turn the MOSFET off and an output voltage valley threshold to turn the MOSFET back on. The following describes the operation of the regulators. When the MOSFET is on, the inductor current rises linearly depending on the inductor and input voltage values. The MOSFET is switched off when the inductor current reaches the fixed ILIM current threshold of 750mA (typical). cycle is fixed. Therefore, an increase in the load current is met by an increase in the switching frequency. The no-load switching quiescent current at input 80V is 5.5µA.
5.1 Peak Current and Propagation Delay
propagation delay, the peak current tends to be higher than 750mA. The propagation delay is typically 50ns. Use Equation 1 to approximately calculate the actual inductor peak current. for a few recommended inductors. Figure 35. Peak Inductor Current: RAA211803 Figure 36. Peak Inductor Current: RAA211805
5.2 Soft-Start
a longer VOUT ramp, and a startup with no load generates a faster ramp. Soft-start time is approximately defined by Equation 2. RTKA211805DE00BU) is given in Table 3, Table 4, and Figure 37 to Figure 42. Table 3. Approximate Soft-Start Times (RAA211803)
- Test conditions: V IN = 24V, COUT = 2x22µF (PN:GRM187R61A226ME15), L = 33µH (PN:74404054330), Power supply:
Table 4. Approximate Soft-Start Times (RAA211805)
- Test conditions: V IN = 24V, COUT = 2x22µF (PN:GRM219R61C226ME15), L = 22µH (PN:74404052220), Power supply:
Figure 37. Soft-Start (No Load): RAA211803 Figure 38. Soft-Start (No Load): RAA211805
5.3 Undervoltage Lockout
prevent jittering during VIN turn-off and turn-on. Figure 39. Soft-Start (VIN = 24V): RAA211803 Figure 40. Soft-Start (V IN = 24V): RAA211805 Figure 41. Soft-Start (Resistive Full Load): RAA211803 Figure 42. So ft-Start (Resistive Full Load): RAA211805
5.4 Enable Control
Figure 43. Typical Application Circuit Diagram with VIN UVLO Programming by ENABLE
5.5 Overcurrent Protection (OCP)
monitored to turn off the MOSFET at 750mA (typical) peak current.
5.6 Short Circuit
5.7 V OUT Overvoltage Protection (OVP)
VOUT valley threshold defined by the controller.
5.8 Pre-Baised Output Voltage
output voltage. The start-up is smooth, monotonic, and free from any glitches. a power-saving feature, as the typical IQ of the part is 4.5µA at no load and no switching conditions.
5.9 Over-Temperature Protection (OTP)
Figure 44. Timing Diagram with EN Turn-On and VIN UVLO Turn-Off
resume operation by stepping through soft-start.
5.10 Switching Frequency
maximum switching frequency is dependent on inductance and peak current. RTKA211803DE0000BU and RTKA211805DE0000BU is shown in Figure 45 and Figure 50. The switching frequency can be approximately given by Equation 6. Figure 45. Switching Frequency vs Load Current Figure 46. Switching Frequency vs Load Current Figure 47. Switching Frequency vs Load Current Figure 48. Switching Frequency vs Load Current
5.11 Fault Summary
next, the chip starts normally according to the EN state.
6.1 Input Capacitor
discontinuous switching current. input capacitor with a minimum voltage rating of 100V with a low leakage current is advised. Figure 49. Switching Frequency vs Input Voltage Figure 50. Switching Frequency vs Input Voltage reset state when UVLO is satisfied. is met, internal circuit monitor OT hysteresis. limit, the MOSFET turns off. VOUT Short Immediate Device operates in current limit mode.
R16DS0339EU0100 Rev.1.00 Page 21 Oct 2, 2023 RAA211803, RAA211805 Datasheet
6.2 Output Capacitor
Output capacitor selection impacts the steady state and transient performance of the buck converter. Factors such as output ripple voltage, output voltage excursion during transients, and output voltage regulation should be considered when selecting the output capacitor. Renesas recommends using low ESR/low ESL X5R/X7R dielectric ceramic for the output capacitor with a minimum voltage rating of 10V for RAA211803 and 16V for RAA211805. It is important to consider that the effective capacitance reduces with DC bias voltage across it. Therefore, consult the capacitor datasheet to understand the impact of this effect. Use Equation 7 to approximate the output voltage ripple, where IPEAK is the peak inductor current from Equation 1. Use Equation 7 for initial capacitor selection. Select the final value based on testing a prototype board, capacitor DC bias derating, and capacitor ESR. Output capacitance determines the output voltage ripple and VOUT regulation for RAA211803 and RAA211805. Choose a minimum of 22µF for the smallest area or a larger output capacitor to reduce ripple and provide tighter voltage regulation (see Figure 31 to Figure 32).
6.3 Inductor
Select an inductor with the lowest possible DC resistance (DCR) to minimize power losses. The continuous current rating of the inductor should be high enough to accommodate the DC load current and AC ripple current with an additional margin for overload conditions. The saturation current rating should be more than the peak inductor current. The factory recommends a minimum inductance of 10µH or higher with a minimum saturation current of 1A. See Figure 35 and Figure 36 for inductor peak current values with different inductances.
6.4 Diode
The devices require a freewheeling diode for the inductor current to flow when the internal high-side MOSFET turns off. Select a diode with a reverse voltage rating at least 20% higher than the maximum input voltage. The continuous current rating of the diode should be greater than the highest output current. Select a diode with low forward voltage drop and fast reverse recovery time for better efficiency. For operation at high temperatures, Renesas recommends using a high-quality Schottky, as diode leakage increases the current consumption of the application. Renesas recommends a minimum reverse breakdown voltage of 100V, a continuous current rating of 0.5A, and a peak current rating of 1A. (EQ. 7) VRIPPLE C() LI PEAK IOUT–() 2 2COUT VOUT VIN =
following guidelines are recommended to achieve good performance. for any step-down converter and should be placed first in the layout. ▪ The copper area of the SW node should not be more than needed. Place the inductor close to the regulator. ▪ Place an output capacitor close to the inductor. ▪ Place and route the power component to keep the power loop are a minimum and short as possible. ▪ Keep all the power components on the same side of the PCB. ▪ Include thermal vias, as necessa ry, to improve heat dissipation. The recommended PCB board layout example is shown in Figure 51 and Figure 52. Figure 51. Layout (Top Layer) Figure 52. Layout (Bottom Layer)
R16DS0339EU0100 Rev.1.00 Page 23 Oct 2, 2023 RAA211803, RAA211805 Datasheet 8. Package Outline Drawing For the most recent package outline drawing, see P5.064B. P5.064B
5 Lead Thin Small Outline Transistor (TSOT) Plastic Package
Rev 3, 2/2022
R16DS0339EU0100 Rev.1.00 Page 24 Oct 2, 2023 RAA211803, RAA211805 Datasheet 9. Ordering Information 10. Revision History Part Number[1][2] 1. These Pb-free plastic packaged products employ special Pb-fre e material sets; molding compounds/die attach materials and NiPdAu plate - e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J-STD-020. 2. For Moisture Sensitiv ity Level (MSL), see the RAA211803, RAA211805 product pages. For more information about MSL, see TB363. Part Marking[3] 3. The part marking is located on the bottom of the part. Package Description[4] (RoHS Compliant) 4. For the Pb-Free Reflow Profile, see TB493. Pkg. Dwg # Carrier Type [5] 5. See TB347 for details about reel specifications. Temp. Range RAA2118034GP3#JA0 803 TSOT-23 P5.064B Reel, 3k -40 to +125°C RAA2118054GP3#JA0 805 RTKA211803DE0000BU RAA211803 Evaluation Board RTKA211805DE0000BU RAA211805 Evaluation Board Revision Date Description
1.00 Oct 2, 2023 Initial release
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