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RT8009
1.25MHz, 600mA, High Efficiency PWM Step-Down DC/DC Converter
General Description
The RT8009 is a high-efficiency pulse-width-modulated (PWM) step-down DC-DC converter. Capable of delivering 600mA output current over a wide input voltage range from 2.5 to 5.5V, the RT8009 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources within the range such as cellular phones, PDAs and handy-terminals. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The RT8009 automatically turns off the synchronous rectifier while the inductor current is low and enters discontinuous PWM mode. This can increase efficiency at light load condition. The RT8009 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. RT8009 enter shutdown mode and consumes less than 0.1uA when EN pin is pulled low. The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operation frequency of 1.25MHz. This along with small SOT-23-5 and TSOT-23-5 package provides small PCB area application. Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection.
Features
+2.5V to +5.5V Input Range Adjustable Output From 0.5V to VIN 1.0V, 1.2V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/ Adjustable Output Voltage 600mA Output Current 95% Efficiency No Schottky Diode Required 1.25MHz Fixed-Frequency PWM Operation Small SOT-23-5 and TSOT-23-5 Package RoHS Compliant and 100% Lead (Pb)-Free
Applications
Cellular Telephones Personal Information Appliances Wireless and DSL Modems MP3 Players Portable Instruments
Ordering Information
RT8009() Package Type B : SOT-23-5 J5 : TSOT-23-5 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage Default : Adjustable 10 : 1.0V 12 : 1.2V 15 : 1.5V 18 : 1.8V 25 : 2.5V 33 : 3.3V
Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100% matte tin (Sn) plating.
Pin Configurations
(TOP VIEW)
VIN GND EN 1 2 3 4 FB/VOUT 5 LX
SOT-23-5/TSOT-23-5
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Typical Application Circuit
VIN 2.5V to 5.5V 1 CIN 4.7uF 3 EN 5 L 4.7uH VOUT
VIN RT8009
LX
VOUT GND 2
4
COUT 10uF
Figure 1. Fixed Voltage Regulator
VIN 2.5V to 5.5V
1 CIN 4.7uF 3
VIN
LX
5
L 4.7uH VOUT C1 R1
RT8009 EN GND 2 FB 4
COUT 10uF R2
R1 VOUT = VREF x 1 + R2 with R1 + R2 1M and VREF(Typ.) = 0.5V
Figure 2. Adjustable Voltage Regulator
Layout Guide
VIN VOUT
L
VIN
L
VOUT
VIN CIN GND EN
1 2 3
5
LX COUT GND
VIN CIN GND EN
1 2
5
LX COUT GND R2
4
VOUT
3
4
FB
R1
VOUT
C1
Figure 3
Layout note: 1. The distance that CIN connects to VIN is as close as possible (Under 2mm). 2. COUT should be placed near RT8009.
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Functional Pin Description
Pin Number 1 2 3 4 5 Pin Name VIN GND EN FB/VOUT LX Power Input. Ground. Chip Enable (Active High, do not leave EN pin floating, and VEN < VIN + 0.6V). Feedback Input Pin. Pin for Switching. Pin Function
Function Block Diagram
EN VIN
OSC & Shutdown Control Slope Compensation Current Sense
RS1 Current Limit Detector
FB/VOUT
Error Amplifier RC COMP
PWM Comparator
Control Logic
Driver
LX
UVLO & Power Good Detector
Zero Detector VREF
RS2
GND
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Absolute Maximum Ratings
(Note 1) 6.5V VIN + 0.6V 0.4W 250C/W 130C/W 150C 260C -65C to 150C 2kV 200V Supply Input Voltage -----------------------------------------------------------------------------------------------------Enable, FB Voltage ------------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C SOT-23-5, TSOT-23-5 ----------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) SOT-23-5, TSOT-23-5, JA ----------------------------------------------------------------------------------------------SOT-23-5, TSOT-23-5, JC ----------------------------------------------------------------------------------------------Junction Temperature Range -------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------
Recommended Operating Conditions
(Note 3)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- -40C to 125C Ambient Temperature Range -------------------------------------------------------------------------------------------- -40C to 85C
Electrical Characteristics
(VIN = 3.6V, VOUT = 2.5V, VREF = 0.5V, L = 4.7H, CIN = 4.7F, COUT = 10F, TA = 25C, IMAX = 600mA unless otherwise specified)
Parameter Input Voltage Range Quiescent Current Shutdown Current Reference Voltage Adjustable Output Range
Symbol V IN IQ I SHDN V RE F V OUT V OUT V OUT V OUT
Test Conditions
Min 2.5
T yp -50 0.1 0.5 ---------
Max 5.5 100 1 0.51 V IN - 0.2 +3 +3 +3 +3 +3 +3 +3
Units V A A V V % % % % % % %
IOUT = 0mA, VFB = VREF + 5% EN = GND For adjustable output voltage VIN = 2.5 to 5.5V, VOUT = 1.0V 0A < IOUT < 600mA VIN = 2.5 to 5.5V, VOUT = 1.2V 0A < IOUT < 600mA VIN = 2.5 to 5.5V, VOUT = 1.5V 0A < IOUT < 600mA VIN = 2.5 to 5.5V, VOUT = 1.8V 0A < IOUT < 600mA (Note 5) VIN = VOUT + V to 5.5V VOUT = 2.5V, 0A < IOUT < 600mA (Note 5) VIN = VOUT + V to 5.5V VOUT = 3.3V, 0A < IOUT < 600mA VIN = VOUT + 0.2V to 5.5V 0A < IOUT < 600mA
--0.49 V REF -3 -3 -3 -3 -3 -3
Output Voltage Accuracy
Fix
V OUT V OUT V OUT V OUT
-3
To be continued
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Parameter Output Voltage Accuracy FB Input Current RDS (ON) of P-Channel MOSFET RDS (ON) of N-Channel MOSFET P-Channel Current Limit EN High-Level Input Voltage EN Low-Level Input Voltage Undervoltage Lock Out threshold Hysteresis Oscillator Frequency fOSC VIN = 3.6V, IO UT = 100mA Adjustable Symbol VOUT IFB Test Conditions VIN = V OUT + V to 5.5V 0A < IOUT < 600mA V FB = VIN VIN = 3.6V VIN = 2.5V VIN = 3.6V VIN = 2.5V (Note 5) Min Typ --0.3 0.4 0.25 0.35 ---1.8 0.1 1.25 160 50 --Max +3 50 0.65 0.80 0.55 0.65 1.8 -0.4 --1.85 ---1 Units % nA
-3
-50 ----1 1.5 ---0.8 --100
RDS (ON)_P IOUT = 200mA RDS (ON)_N IOUT = 200mA ILIM_P VEN_H VEN_L VIN = 2.5V to 5.5 V VIN = 2.5V to 5.5V VIN = 2.5V to 5.5V
A V V V V MHz C ns % A
Thermal Shutdown Temperature TSD Min. On Time Max. Duty Cycle LX Leakage Current V IN = 3.6V, VL X = 0V or V LX = 3.6V
-1
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. 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 for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. JA is measured in the natural convection at T A = 25C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 5. V = IOUT x RDS(ON)_P
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RT8009
Typical Operating Characteristics
Efficiency vs. Load Current
100 90 80
Efficiency vs. Input Voltage
100 90 80
VIN = 3.3V
Efficiency (%)
Efficiency (%)
70 60 50 40 30 20 10
VIN = 5V
70 60 50 40 30 20
IOUT = 300mA
IOUT = 600mA
VOUT = 1.8V
0.11 0.21 0.31 0.41 0.51 0.61
10 0
0 0.01
VOUT = 1.8V
2.5 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5
Load Current (A)
Input Voltage (V)
Load Regulation
1.810 1.805
2.50 2.25 2.00
Current Limit vs. Input Voltage
Load Regulation (V)
Current Limit (A)
1.800 1.795 1.790
VIN = 5.5V
VIN = 3.3V
1.75 1.50 1.25 1.00 0.75 0.50
VIN = 2.5V
1.785 1.780 1.775 1.770
VOUT = 1.8V
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6
0.25 0.00
VOUT = 1.8V
2.5 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5
Load Current (A)
Input Voltage (V)
Frequency vs. Input Voltage
1.26 1.24
Frequency vs. Temperature
1.26 1.24
Frequency (MHz)
1.22 1.20 1.18 1.16 1.14
Frequency (MHz)
1.22 1.20 1.18 1.16 1.14 1.12
VOUT = 1.8V
2.5 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5
VIN = 3.3V, VOUT = 1.8V
1.10 -50 -25 0 25 50 75 100 125
Input Voltage (V)
Temperature (C)
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Reference vs. Input Voltage
0.60 0.58 0.56
Reference vs. Temperature
0.510 0.508 0.505
VOUT = 1.8V
VIN = 3.3V, VOUT = 1.8V
Reference (V)
Reference (V)
0.54 0.52 0.50 0.48 0.46 0.44 0.42 0.40 2.5 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5
0.503 0.500 0.498 0.495 0.493 0.490 -50 -25 0 25 50 75 100 125
Input Voltage (V)
Temperature (C)
Load Transient Response
VIN = 3.3V, VOUT = 1.8V, IOUT = 150mA to 600mA
Load Transient Response
VIN = 3.3V, VOUT = 1.8V, IOUT = 300mA to 600mA
VOUT (20mV/Div)
VOUT (20mV/Div)
IOUT (500mA/Div) Time (100s/Div)
IOUT (500mA/Div) Time (100s/Div)
Output Ripple
VIN = 3.3V, VOUT = 1.8V, IOUT = 600mA
Power On
VIN = 3.3V, VOUT = 1.8V, IOUT = 600mA
VOUT (2mV/Div)
VEN (2V/Div) VOUT (1V/Div) I IN (200mA/Div) Time (500ns/Div) Time (100s/Div)
VLX (5V/Div) ILX (500mA/Div)
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RT8009
Applications Information
The basic RT8009 application circuit is shown in Typical Application Circuit. External component selection is determined by the maximum load current and begins with the selection of the inductor value and operating frequency followed by CIN and COUT. Inductor Selection For a given input and output voltage, the inductor value and operating frequency determine the ripple current. The ripple current IL increases with higher VIN and decreases with higher inductance. inductor ripple current and consequent output voltage ripple. Do not allow the core to saturate! Different core materials and shapes will change the size/ current and price/current relationship of an inductor. Toroid or shielded pot cores in ferrite or permalloy materials are small and don' t radiate energy but generally cost more than powdered iron core inductors with similar characteristics. The choice of which style inductor to use mainly depends on the price vs size requirements and any radiated field/EMI requirements. CIN and COUT Selection The input capacitance, C IN, is needed to filter the trapezoidal current at the source of the top MOSFET. To prevent large ripple voltage, a low ESR input capacitor sized for the maximum RMS current should be used. RMS current is given by : IRMS = IOUT(MAX) VOUT VIN VIN -1 VOUT
V V IL = OUT 1 - OUT VIN f x L
Having a lower ripple current reduces the ESR losses in the output capacitors and the output voltage ripple. Highest efficiency operation is achieved at low frequency with small ripple current. This, however, requires a large inductor. A reasonable starting point for selecting the ripple current is IL = 0.4(IMAX). The largest ripple current occurs at the highest VIN. To guarantee that the ripple current stays below a specified maximum, the inductor value should be chosen according to the following equation :
VOUT VOUT L= 1 - V f x IL(MAX) IN(MAX)
Inductor Core Selection Once the value for L is known, the type of inductor must be selected. High efficiency converters generally cannot afford the core loss found in low cost powdered iron cores, forcing the use of more expensive ferrite or mollypermalloy cores. Actual core loss is independent of core size for a fixed inductor value but it is very dependent on the inductance selected. As the inductance increases, core losses decrease. Unfortunately, increased inductance requires more turns of wire and therefore copper losses will increase. Ferrite designs have very low core losses and are preferred at high switching frequencies, so design goals can concentrate on copper loss and preventing saturation. Ferrite core material saturates "hard", which means that inductance collapses abruptly when the peak design current is exceeded. This results in an abrupt increase in
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This formula has a maximum at VIN = 2VOUT, where IRMS = IOUT/2. This simple worst-case condition is commonly used for design because even significant deviations do not offer much relief. Note that ripple current ratings from capacitor manufacturers are often based on only 2000 hours of life which makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher temperature than required. Several capacitors may also be paralleled to meet size or height requirements in the design. The selection of COUT is determined by the effective series resistance (ESR) that is required to minimize voltage ripple and load step transients, as well as the amount of bulk capacitance that is necessary to ensure that the control loop is stable. Loop stability can be checked by viewing the load transient response as described in a later section. The output ripple, VOUT, is determined by :
1 VOUT IL ESR + 8fCOUT
The output ripple is highest at maximum input voltage since IL increases with input voltage. Multiple capacitors placed in parallel may be needed to meet the ESR and RMS current handling requirements. Dry tantalum, special
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polymer, aluminum electrolytic and ceramic capacitors are all available in surface mount packages. Special polymer capacitors offer very low ESR but have lower capacitance density than other types. Tantalum capacitors have the highest capacitance density but it is important to only use types that have been surge tested for use in switching power supplies. Aluminum electrolytic capacitors have significantly higher ESR but can be used in cost-sensitive applications provided that consideration is given to ripple current ratings and long term reliability. Ceramic capacitors have excellent low ESR characteristics but can have a high voltage coefficient and audible piezoelectric effects. The high Q of ceramic capacitors with trace inductance can also lead to significant ringing. Using Ceramic Input and Output Capacitors Higher values, lower cost ceramic capacitors are now becoming available in smaller case sizes. Their high ripple current, high voltage rating and low ESR make them ideal for switching regulator applications. However, care must be taken when these capacitors are used at the input and output. When a ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a load step at the output can induce ringing at the input, VIN. At best, this ringing can couple to the output and be mistaken as loop instability. At worst, a sudden inrush of current through the long wires can potentially cause a voltage spike at VIN large enough to damage the part. Output Voltage Programming The resistive divider allows the VFB pin to sense a fraction of the output voltage as shown in Figure 4.
VOUT R1 VFB RT8009 GND R2
Efficiency Considerations The efficiency of a switching regulator is equal to the output power divided by the input power times 100%. It is often useful to analyze individual losses to determine what is limiting the efficiency and which change would produce the most improvement. Efficiency can be expressed as : Efficiency = 100% - (L1+ L2+ L3+ ...) where L1, L2, etc. are the individual losses as a percentage of input power. Although all dissipative elements in the circuit produce losses, two main sources usually account for most of the losses : VIN quiescent current and I2R losses. The VIN quiescent current loss dominates the efficiency loss at very low load currents whereas the I2R loss dominates the efficiency loss at medium to high load currents. In a typical efficiency plot, the efficiency curve at very low load currents can be misleading since the actual power lost is of no consequence. 1. The VIN quiescent current is due to two components : the DC bias current as given in the electrical characteristics and the internal main switch and synchronous switch gate charge currents. The gate charge current results from switching the gate capacitance of the internal power MOSFET switches. Each time the gate is switched from high to low to high again, a packet of charge Q moves from VIN to ground. The resulting Q/t is the current out of VIN that is typically larger than the DC bias current. In continuous mode, IGATECHG = f(QT+QB) where QT and QB are the gate charges of the internal top and bottom switches. Both the DC bias and gate charge losses are proportional to VIN and thus their effects will be more pronounced at higher supply voltages. 2. I2R losses are calculated from the resistances of the internal switches, R SW and external inductor RL. In continuous mode the average output current flowing through inductor L is "chopped" between the main switch and the synchronous switch. Thus, the series resistance looking into the LX pin is a function of both top and bottom MOSFET RDS(ON) and the duty cycle (DC) as follows : RSW = RDS(ON)TOP x DC + RDS(ON)BOT x (1-DC) The RDS(ON) for both the top and bottom MOSFETs can be obtained from the Typical Performance Characteristics
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Figure 4. Setting the Output Voltage For adjustable about voltage mode, the output voltage is set by an external resistive divider according to the following equation : VOUT = VREF (1 + R1) R2 where VREF is the internal reference voltage (0.5V typ.)
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curves. Thus, to obtain I2R losses, simply add RSW to RL and multiply the result by the square of the average output current. Other losses including CIN and COUT ESR dissipative losses and inductor core losses generally account for less than 2% of the total loss. Thermal Considerations The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula : PD(MAX) = ( TJ(MAX) - TA ) / JA Where T J(MAX) is the maximum operation junction temperature 125C, TA is the ambient temperature and the JA is the junction to ambient thermal resistance. For recommended operating conditions specification of RT8009 DC/DC converter, where TJ (MAX) is the maximum junction temperature of the die (125C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance JA is layout dependent. For SOT-23-5/TSOT-23-5 packages, the thermal resistance JA is 250C/W on the standard JEDEC 51-3 single-layer thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula : PD(MAX) = ( 125C - 25C ) / 250 = 0.4 W for SOT-23-5/ TSOT-23-5 packages The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance JA. For RT8009 packages, the Figure 5 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. The value of junction to case thermal resistance JC is popular for users. This thermal parameter is convenient for users to estimate the internal junction operated temperature of packages while IC operating. It's independent of PCB layout, the surroundings airflow effects and temperature difference between junction to ambient. The operated junction temperature can be calculated by following formula : TJ = TC + PD x JC
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Where TC is the package case (Pin 2 of package leads) temperature measured by thermal sensor, PD is the power dissipation defined by user's function and the JC is the junction to case thermal resistance provided by IC manufacturer. Therefore it's easy to estimate the junction temperature by any condition.
450
Maximum Power Dissipation (mW)
Single Layer PCB
400 350 300 250 200 150 100 50 0 0 20 40 60 80 100 120 140
SOT-23-5, TSOT-23-5 Packages
Ambient Temperature (C)
Figure 5. Derating Curves for RT8009 Package Checking Transient Response The regulator loop response can be checked by looking at the load transient response. Switching regulators take several cycles to respond to a step in load current. When a load step occurs, VOUT immediately shifts by an amount equal to ILOAD (ESR), where ESR is the effective series resistance of COUT. ILOAD also begins to charge or discharge COUT generating a feedback error signal used by the regulator to return VOUT to its steady-state value. During this recovery time, VOUT can be monitored for overshoot or ringing that would indicate a stability problem. Layout Considerations Follow the PCB layout guidelines for optimal performance of RT8009. For the main current paths as indicated in bold lines in Figure 6 keep their traces short and wide. Put the input capacitor as close as possible to the device pins (VIN and GND). LX node is with high frequency voltage swing and should be kept small area. Keep analog components away from LX node to prevent stray capacitive noise pick-up.
RT8009
Connect feedback network behind the output capacitors. Keep the loop area small. Place the feedback components near the RT8009. Connect all analog grounds to a command node and then connect the command node to the power ground behind the output capacitors. An example of 2-layer PCB layout is shown in Figure 7 and Figure 8 for reference.
VIN 1 R3 3 C3 4.7uF EN GND 2 FB 4 C2 R2 C4 10uF VIN L1 LX 5 4.7uH C1 R1 VOUT
Figure 7. Top Layer
RT8009
Figure 6. EVB Schematic
Figure 8. Bottom Layer
Recommended component selection for Typical Application Table 1. Inductors Component Supplier Series Inductance (uH) DCR (m) Current Rating (mA) Dimensions (mm) TAIYO YUDEN NR 3015 2.2 60 1480 3x3x1.5 TAIYO YUDEN NR 3015 4.7 120 1020 3x3x1.5 Sumida CDRH2D14 2.2 75 1500 4.5x3.2x1.55 Sumida CDRH2D14 4.7 135 1000 4.5x3.2x1.55 GOTREND GT SD32 2.2 58 1500 3.85x3.85x1.8 GOTREND GT SD32 4.7 146 1100 3.85x3.85x1.8 Table 2. Capacitors for CIN and COUT
Com ponent Supplier TDK TDK MURATA MURATA MURATA TAIYO YUDEN TAIYO YUDEN TAIYO YUDEN Part No. C1608JB0J475M C2012JB0J106M GRM188R60J475KE19 GRM219R60J106ME19 GRM219R60J106KE19 JMK107BJ475RA JMK107BJ106MA JMK212BJ106RD Capacitance (uF) 4.7 10 4.7 10 10 4.7 10 10 Case Size 0603 0805 0603 0805 0805 0603 0603 0805
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Outline Dimension
H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 0.000 1.397 0.356 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.035 0.000 0.055 0.014 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT-23-5 Surface Mount Package
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H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.700 0.000 1.397 0.300 2.591 2.692 0.838 0.080 0.300 Max 1.000 0.100 1.803 0.559 3.000 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.028 0.000 0.055 0.012 0.102 0.106 0.033 0.003 0.012 Max 0.039 0.004 0.071 0.022 0.118 0.122 0.041 0.010 0.024
TSOT-23-5 Surface Mount Package
Richtek Technology Corporation
Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
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