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Preliminary
RT9016
500mA Peak, Thermal Folded Back CMOS LDO Regulator
General Description
The RT9016 is designed for portable RF and wireless applications with demanding performance and space requirements. The RT9016 performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. A noise bypass pin is available for further reduction of output noise. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The RT9016 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The RT9016 consumes less than 0.01A in shutdown mode and has fast turn-on time less than 50s. RT9016 is short circuit thermal folded back protected. RT9016 lowers its OTP trip point from 165C to 110C when output short circuit occurs (VOUT < 0.4V) providing maximum safety to end users. The other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the SOT-23-5 and WDFN-6L 2x2 packages.
Features
Short Circuit Thermal Folded Back Protection Ultra-Low-Noise for RF Application Ultra-Fast Response in Line/Load Transient Quick Start-Up (Typically 50s) 0.01A Standby Current When Shutdown Low Dropout : 380mV @ 500mA Wide Operating Voltage Ranges : 2.5V to 5.5V TTL-Logic-Controlled Shutdown Input Low Temperature Coefficient Current Limiting Protection Thermal Shutdown Protection Only 1F Output Capacitor Required for Stability High Power Supply Rejection Ratio Custom Voltage Available RoHS Compliant and 100% Lead (Pb)-Free
Applications
CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances
Ordering Information
RT9016Package Type B : SOT-23-5 QW : WDFN-6L 2x2 (W-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage 15 : 1.5V 16 : 1.6V : 34 : 3.4V 35 : 3.5V 1H : 1.85V 2H : 2.85V
Marking Information
For marking information, contact our sales representative directly or through a Richtek distributor located in your area, otherwise visit our website for detail.
Pin Configurations
(TOP VIEW)
VIN GND EN 1 2 3 4 BP 5 VOUT
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.
EN GND VIN
1 2 3 7
6 5 4
BP NC VOUT
SOT-23-5
WDFN-6L 2x2
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RT9016
Typical Application Circuit
Preliminary
RT9016 VIN CIN 1uF VIN GND EN BP CBP 22nF VOUT COUT 1uF VOUT
Chip Enable
Functional Pin Description
Pin Name Pin Function VIN GND EN BP VOUT Input Voltage. Ground. Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100k resistor connected to GND when the control signal is floating. Reference Noise Bypass. Output Voltage.
Function Block Diagram
EN Quick Start BP VREF +
Shutdown and Logic Control
VIN
MOS Driver VOUT Current-Limit and Thermal Protection GND
Error Amplifier
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Preliminary Absolute Maximum Ratings
(Note 1)
RT9016
6V 400mW 606mW 250C/W 165C/W 260C 150C -65C to 150C 2kV 200V
Supply Input Voltage -----------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C SOT-23-5 -------------------------------------------------------------------------------------------------------------------WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) SOT-23-5, JA --------------------------------------------------------------------------------------------------------------WDFN-6L 2x2, JA --------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature ---------------------------------------------------------------------------------------------------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 = VOUT + 1V, CIN = COUT = 1F, CBP = 22nF, TA = 25C, unless otherwise specified)
Parameter Output Voltage Accuracy Current Limit Quiescent Current Dropout Voltage Line Regulation Load Regulation Standby Current EN Input Bias Current EN Threshold (Note 5)
Symbol VOUT ILIM IQ VDROP VLINE
Test Conditions IOUT = 1mA RLOAD = 1 VEN
Min -2 530 --------1.2 ----
Typ --90 220 380 --0.01 0 --100 -70 -50
Max +2 -130 --0.3 0.6 1 100 0.4 -----
Units % mA A mV % % A nA V VRMS dB
1.2V, IOUT = 0mA
IOUT = 300mA, VOUT > 2.8V IOUT = 500mA, VOUT > 2.8V VIN = (VOUT + 0.3V) to 5.5V, IOUT = 1mA VEN = GND, Shutdown VEN = GND or VIN VIN = 3V to 5.5V, Shutdown VIN = 3V to 5.5V, Start-Up 10Hz to 100kHz, IOUT = 200mA COUT = 1F COUT = 1F, IOUT = 10mA
VLOAD 1mA < IOUT < 500mA ISTBY IIBSD Logic-Low Voltage VIL Logic-High Voltage VIH eNO PSRR
Output Noise Voltage Power Supply Rejection Rate f = 100Hz f = 10kHz
To be continued
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RT9016
Parameter Thermal Shutdown Temperature Thermal Shutdown Temperature Hysteresis Thermal Folded Back Symbol TSD TSD
Preliminary
Test Conditions Min ---Typ 165 30 110 Max ---Units C C C
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 (Single Layer, 1S) of JEDEC 51-3 thermal measurement standard. Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV.
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Preliminary Typical Operating Characteristics
Output Voltage vs. Temperature
1.8 1.7
RT9016
Quiescent Current vs. Temperature
95 90
Quiescent Current (uA)
50 75 100 125
RT9016-15PB VIN = 3.3V CIN = COUT = 1uF X7R
RT9016-15PB VIN = 3.3V CIN = COUT = 1uF X7R
Output Voltage (V)
1.6 1.5 1.4 1.3 1.2 -50 -25 0 25
85 80 75 70 65 60 -50 -25 0 25 50 75 100 125
Temperature (C)
Temperature (C)
Dropout Voltage vs. Load Current
600 500
RT9016-33PB CIN = COUT = 1uF TJ = 125C
20
PSRR
VIN = 4V to 5V CIN = COUT = 1uF, X7R
Dropout Voltage (mV)
0
PSRR (dB)
TJ = -40C
400 300 200 100 0 0 100 200
TJ = 25C
-20
-40
-60
ILOAD = 100mA ILOAD = 10mA
-80
300 400 500
10 0.01
100 0.1
1K 1
10K 10
100K 100
1M 1000
Load Current (mA)
Frequency (kHz) (Hz)
EN Pin Shoutdown Threshold vs. Temperature
1.75
EN Pin Shutdown Response
EN Pin Voltage (V)
10 5 0 VIN = 5V CIN = COUT = 1uF RT9016-28PB No Load
EN Pin Shoutdown Threshold (V)
1.5
RT9016-15PB VIN = 3.3V CIN = COUT = 1uF X7R
1.25
1
Output Voltage (V)
-50 -25 0 25 50 75 100 125
2 1 0
0.75
0.5
Time (500s/Div)
Temperature (C)
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RT9016
Load Transient Response
Load Current (mA)
400 200 0 RT9016-35PB VIN = 5.0V
Preliminary
Load Transient Response
RT9016-35PB VIN = 5.0V CIN = COUT = 1uF ILOAD = 10mA to 400mA
CIN = COUT = 1uF ILOAD = 10mA to 300mA
Output Voltage Load Current Deviation (mV) (mA)
400 200 0 50 0 -50
Output Voltage Deviation (mV)
50 0 -50
Time (500s/Div)
Time (500s/Div)
Line Transient Response
Input Voltage Deviation (V)
6 5 4
Line Transient Response
Input Voltage Deviation (V)
6 5 4 VIN = 4V to 5V COUT = 1uF RT9016-25PB ILOAD = 100mA
VIN = 4V to 5V COUT = 1uF
RT9016-25PB ILOAD = 1mA
Output Voltage Deviation (mV)
10 0 -10
Output Voltage Deviation (mV)
10 0 -10
Time (50s/Div)
Time (100s/Div)
Noise
VIN = 4.5V CIN = COUT = 1uF, X7R 200 RT9016-30PB ILOAD = 50mA 200
Noise
VIN = 4.5V CIN = COUT = 1uF, X7R RT9016-15PB ILOAD = 50mA
Noise (V)
0 -100 -200
Noise (V)
f = 10Hz to 100kHz
100
100 0 -100 -200
f = 10Hz to 100kHz
Time (10ms/Div)
Time (10ms/Div)
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Preliminary
RT9016
Start Up
EN Pin Voltage (V)
10 5 0 VIN = 5V CIN = COUT = 1uF RT9016-28PB No Load
Output Voltage (V)
2 1 0
Time (10s/Div)
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RT9016
Applications Information
Preliminary
Like any low-dropout regulator, the external capacitors used with the RT9016 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1F on the RT9016 input and the amount of capacitance can be increased without limit. The input capacitor must be located a distance of not more than 0.5 inch from the input pin of the IC and returned to a clean analog ground. Any good quality ceramic or tantalum can be used for this capacitor. The capacitor with larger value and lower ESR (equivalent series resistance) provides better PSRR and line-transient response. The output capacitor must meet both requirements for minimum amount of capacitance and ESR in all LDOs application. The RT9016 is designed specifically to work with low ESR ceramic output capacitor in space-saving and performance consideration. Using a ceramic capacitor whose value is at least 1F with ESR is > 25m on the RT9016 output ensures stability. The RT9016 still works well with output capacitor of other types due to the wide stable ESR range. Figure 1 shows the curves of allowable ESR range as a function of load current for various output capacitor values. Output capacitor of larger capacitance can reduce noise and improve load transient response, stability, and PSRR. The output capacitor should be located not more than 0.5 inch from the VOUT pin of the RT9016 and returned to a clean analog ground.
Bypass Capacitor and Low Noise Connecting a 22nF between the BP pin and GND pin significantly reduces noise on the regulator output, it is critical that the capacitor connection between the BP pin and GND pin be direct and PCB traces should be as short as possible. There is a relationship between the bypass capacitor value and the LDO regulator turn on time. DC leakage on this pin can affect the LDO regulator output noise and voltage regulation performance. Enable Function The RT9016 features an LDO regulator enable/disable function. To assure the LDO regulator will switch on, the EN turn on control level must be greater than 1.2 volts. The LDO regulator will go into the shutdown mode when the voltage on the EN pin falls below 0.4 volts. For to protecting the system, the RT9016 have a quick-discharge function. If the enable function is not needed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. Thermal Considerations Thermal protection limits power dissipation in RT9016. When the operation junction temperature exceeds 165C, the OTP circuit starts the thermal shutdown function turn the pass element off. The pass element turn on again after the junction temperature cools by 30C. RT9016 lowers its OTP trip level from 165C to 110C when output short circuit occurs (VOUT < 0.4V) as shown in Figure 2. This limits IC case temperature under 100C and provides maximum safety to end users when output short circuit occurs. For continue operation, do not exceed absolute maximum operation junction temperature 125C. The power dissipation definition in device is : PD = (VIN-VOUT) x IOUT + VIN x IQ
Region of Stable COUT ESR vs. Load Current
100.00 100
C Stable C () Region of OUT ESROUT ESR ()
Unstable Region 10 10.00
RT9016-15PB CIN = 1F, X7R
1.00 1
COUT = 1uF
0.10
Stable Region
0.01
Unstable Region (Simulation Verity)
0.00 0 100 200 300 400 500
Load Current (mA)
Figure 1
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 :
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Preliminary
PD(MAX) = ( TJ(MAX) - TA ) /JA
Power Dissipation (mW)
700
RT9016
WDFN-6L 2x2
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 RT9016, where T J(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 package is 250C/W and WDFN-6L 2x2 package is 165C/W on standard JEDEC 51-3 thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula : PD(MAX) = (125C-25C) / 250 = 400mW (SOT-23-5) PD(MAX) = (125C-25C) / 165 = 606mW V(DFN-6L 2x2) The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance JA. For RT9016 packages, the Figure 3 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed.
VOUT Short to GND
600 500
SOT-23-5
400 300 200 100 0 0 25 50 75 100 125 150
Ambient Temperature (C)
Figure 3. Derating Curve for Packages
0.4V VOUT
IOUT
TSD 165 C 110 C OTP Trip Point 110 C IC Temperature 80 C
Figure 2. Short Circuit Thermal Folded Back Protection when Output Short Circuit Occurs
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RT9016
Outline Dimension
Preliminary
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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Preliminary
RT9016
D
D2 L
E
E2 SEE DETAIL A
1 e A A1 A3
b
2
1
2
1
DETAIL A Pin #1 ID and Tie Bar Mark Options Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated.
Symbol A A1 A3 b D D2 E E2 e L
Dimensions In Millimeters Min 0.700 0.000 0.175 0.200 1.950 1.000 1.950 0.500 0.650 0.300 0.400 Max 0.800 0.050 0.250 0.350 2.050 1.450 2.050 0.850
Dimensions In Inches Min 0.028 0.000 0.007 0.008 0.077 0.039 0.077 0.020 0.026 0.012 0.016 Max 0.031 0.002 0.010 0.014 0.081 0.057 0.081 0.033
W-Type 6L DFN 2x2 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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