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RT9187
1A, Ultra-Low Dropout, Ultra-Fast CMOS LDO Regulator
General Description
The RT9187 is a high-performance, 1A LDO regulator, offering extremely high PSRR and ultra-low dropout. Ideal for portable RF and wireless applications with demanding performance and space requirements. A noise reduction pin is also available for further reduction of output noise. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The RT9187 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The RT9187 consumes less than 0.1A in shutdown mode and has fast turn-on time less than 40s. The other features include ultra-low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the VDFN-8L 3x3 package.
Features
Ultra-Low-Noise for RF Application Ultra-Fast Response in Line/Load Transient Quick Start-Up (Typically 40s) < 0.1A Standby Current When Shutdown Low Dropout : 240mV at 1A Wide Operating Voltage Ranges : 2.5V to 5.5V TTL-Logic-Controlled Shutdown Input Current Limiting Protection Thermal Shutdown Protection Only 2.2F Output Capacitor Required for Stability High Power Supply Rejection Ratio RoHS Compliant and 100% Lead (Pb)-Free
Applications
CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments Mini PCI & PCI-Express Cards PCMCIA & New Cards Portable Information Appliances
Ordering Information
RT9187() Package Type QV : VDFN-8L 3x3 (V-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) None : Adjustable Output Fixed Output Voltage Code 10 : 1.0V 12 : 1.2V 15 : 1.5V 18 : 1.8V 25 : 2.5V 28 : 2.8V 30 : 3.0V 33 : 3.3V
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 VIN VOUT VOUT
1 2 3 4 8 7 6 5
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.
9
EN NC GND BP/ADJ
VDFN-8L 3x3
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RT9187
Typical Application Circuit
VIN
CIN 2.2uF
VIN
VOUT COUT 2.2uF RT9187 BP
VOUT
VIN
VIN CIN 2.2uF
VOUT R1 ADJ
RT9187 CBP 10nF Chip Enable EN GND
VOUT COUT 2.2uF
Chip Enable
EN GND
R2
Figure 1. Fixed Operation
Figure 2. Adjustable Operation
V
OUT
= 0.8 x ( 1+
R1 ) Volts R2
Note: The value of R2 should be less than 80k to maintain regulation.
Function Pin Description
Pin No. RT9187-xxPQV (Fixed) 1 2 3 4 5 5 6 7 8 Exposed Pad (9) 6 7 8 RT9187PQV (Adjustable) 1 2 3 4 VIN VIN VOUT VOUT BP ADJ GND NC EN NC Supply Input. Supply Input. Regulator Output. Regulator Output. Noise Reduction. Connecting a 10nF capacitor to GND to reduce output noise. If external feedback resistors are applied, the output voltage will be: VOUT = 0.8 x (1+ Common Ground. No Internal Connection. Enable Input Logic, Active High. When the EN goes to a logic low, the device is in shutdown mode. No Internal Connection.
R1 ) Volts R2
Pin Name
Pin Function
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RT9187
Function Block Diagram
VIN EN EN OTP POR BIAS VREF + Current Limit Quick start VOUT
ADJ
Adjustable
GND
VIN EN EN OTP POR BIAS VREF + VOUT Current Limit BP Quick start
Fixed
GND
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RT9187
Absolute Maximum Ratings
(Note 1) Supply Input Voltage -------------------------------------------------------------------------------------------------- 6V EN Input Voltage ------------------------------------------------------------------------------------------------------- 6V Power Dissipation, PD @ TA = 25C VDFN-8L 3x3 ----------------------------------------------------------------------------------------------------------- 0.923W Package Thermal Resistance (Note 9) VDFN-8L 3x3, JC ----------------------------------------------------------------------------------------------------- 8.2C/W VDFN-8L 3x3, JA ------------------------------------------------------------------------------------------------------ 108C/W Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260C Junction Temperature ------------------------------------------------------------------------------------------------- 150C Storage Temperature Range ---------------------------------------------------------------------------------------- -65C to 150C ESD Susceptibility (Note 2) HBM ---------------------------------------------------------------------------------------------------------------------- 2kV MM ------------------------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions
(Note 3)
Supply Input Voltage -------------------------------------------------------------------------------------------------- 2.5V to 5.5V EN Input Voltage ------------------------------------------------------------------------------------------------------- 0V to 5.5V Junction Temperature Range ---------------------------------------------------------------------------------------- -40C to 125C Ambient Temperature Range ---------------------------------------------------------------------------------------- -40C to 85C
Electrical Characteristics
(VIN = VOUT + 1V, VEN = VIN, CIN = COUT = 2.2F (Ceramic) & CBP = 10nF, TA = 25C unless otherwise specified)
Parameter Output Voltage Accuracy (Fixed Output Voltage) Output Voltage Range (Adjustable) Quiescent Current (Note 6) Standby Current (Note 7) Current Limit Dropout Voltage (Note 4)
Symbol VOUT VOUT_Adj IQ ISTBY ILIM VDROP
Test Conditions IOUT = 10mA
Min -2 0.8
Typ 0 -380 0.1 2.8 60 120 240 0.4 --0.1 -60 -50
Max +2 4.5 500 1 3 100 180 360 -0.6 -1 ---
Units % V A A A mV
VEN VIH, IOUT = 0mA VEN VIL,VIN = 3.3V RLOAD = 0.5, VIN = 3.3V IOUT = 0.25A (Note 8) IOUT = 0.5A IOUT = 1.0A VIN = (VOUT + 0.5V) 10mA < IOUT < 1.0A VIN = 3.3V VIN = 3.3V VIN = 3.3V, Enable IOUT = 300mA
--2 -----1.8 ----
Load Regulation (Note 5) (Fixed Output Voltage) EN Threshold Logic-Low Voltage Logic-High Voltage f = 100Hz f = 10kHz
VLOAD VIL VIH IEN PSRR
%/A
V A dB
Enable Pin Current Power Supply Rejection Rate
To be continued
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RT9187
Parameter Line Regulation Start-Up Time Thermal Shutdown Temperature Thermal Shutdown Hysteresis ADJ Reference Voltage Tolerance ADJ Pin Current VREF IADJ VADJ = V REF 0.784 -0.8 10 0.816 100 V nA Symbol V LINE TStart_Up TSD TS D Test Conditions V IN = (V OUT +0.5) to 5.5V, IO UT = 1mA RLOAD = 3, 1nF C BP 0.1F Min ----Typ -40 170 30 Max 0.3 ---Units % s 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. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV. Note 5. Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices are tested for load regulation in the load range from 10mA to 1.0A. Note 6. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN - IOUT under no load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin current. Note 7. Standby current is the input current drawn by a regulator when the output voltage is disabled by a shutdown signal (VEN >1.8V ). Note 8. Performance at -5C TA 85C is assured by design. Note 9. 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.
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RT9187
Typical Operating Characteristics
(COUT = 2.2F/x5R, CBP = 10nF, unless otherwise specified ) Quiescent Current vs. Temperature
500
Quiescent Current vs. Input Voltage
500
VIN = 3.3V
VIN = 3.3V
Quiescent Current (uA)
Quiescent Current (uA)
-50 -40 -25 0 25 50 75 100 125
400
400
300
300
200
200
100
100
0
0 3 3.5 4 4.5 5 5.5
Temperature (C)
Input Voltage (V)
Dropout Voltage vs. Load Current
300 250
Current Limit
VIN = 3.3V 5
VOUT = 2.8V
Dropout Voltage (mV)
200
Output Current (A)
4 3 2 1 0
TJ = 25C
150 100 50 0 0.0 0.2 0.4 0.6 0.8 1.0
TJ = 125C TJ = -40C
Time (1ms/Div)
Load Current (A)
EN Pin Voltage (V)
VIN = 3.3V, ILOAD : 560mA 10 5 0
EN Pin Voltage (V)
EN Pin Shutdown Response
Start Up
4 2 0
Output Voltage (V)
Output Voltage (V)
4 2 0
2 1 0 VIN = 3.3V ILOAD : 560mA
Time (100us/Div)
Time (25us/Div)
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RT9187
Line Transient Regulation
Input Voltage Deviation (V) Input Voltage Deviation (V)
VIN = 3.3V to 4.3V, ILOAD : 1A 4.3 3.3 4.3 3.3
Line Transient Regulation
VIN = 3.3V to 4.3V, ILOAD : 800mA
Output Voltage Deviation (mV)
Output Voltage Deviation (mV)
100 0
10 0 -10
-100
Time (500us/Div)
Time (500us/Div)
Load Transient Regulation
Load Current (A)
VIN = 3.3V, ILOAD : 50mA to 1A 1 0
Load Transient Regulation
Load Current (A)
VIN = 3.3V, ILOAD : 50mA to 800mA 1 0 (1A/Div)
Output Voltage Deviation (mV)
Output Voltage Deviation (mV)
100 0
50 0 -50 (50mV/Div)
-100
Time (100us/Div)
Time (100us/Div)
20
PSRR
Region of Stable C OUT ESR () Region of Stable COUT ESR ()
VIN = VEN = 3.8V
Region of Stable COUT ESR vs. Load Current
100
VIN = 3.3V
10
Unstable Range
0
VIN = 6.0V Stable Range
PSRR (dB)
-20
1
-40
0.1
ILOAD = 280mA
-60
0.01
ILOAD = 10mA
-80 0.0 10 0.1 100 1.0 1k 10.0 10k 100.0 100k 1000.0 10000.0 1M 10M
Simulation Verify
0.001 0 0.2 0.4 0.6 0.8 1
Frequency (Hz)
Load Current (A)
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RT9187
Outline Dimension
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 0.800 0.000 0.175 0.200 2.950 2.100 2.950 1.350 0.650 0.425 0.525 Max 1.000 0.050 0.250 0.300 3.050 2.350 3.050 1.600
Dimensions In Inches Min 0.031 0.000 0.007 0.008 0.116 0.083 0.116 0.053 0.026 0.017 0.021 Max 0.039 0.002 0.010 0.012 0.120 0.093 0.120 0.063
V-Type 8L DFN 3x3 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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