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Preliminary
RT9012
300mA Dual LDO Regulator with POR
General Description
RT9012 is a dual channel, low noise, and low dropout with the sourcing ability up to 300mA and power-on reset function. The range of output voltage is from 1.2V to 3.6V by operating from 2.5V to 5.5V input.
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Features
Wide Operating Voltage Ranges : 2.5V to 5.5V Low-Noise for RF Application No Noise Bypass Capacitor Required Fast Response in Line/Load Transient TTL-Logic-Controlled Shutdown Input Low Temperature Coefficient Dual LDO Outputs (300mA/300mA) Ultra-low Quiescent Current 27A/LDO High Output Accuracy 2% Short Circuit Protection Thermal Shutdown Protection Current Limit Protection Short Circuit Thermal Folded Back Protection Tiny 8-Lead WDFN Package RoHS Compliant and 100% Lead (Pb)-Free
RT9012 offers 2% accuracy, extremely low dropout voltage (240mV @ 300mA), and extremely low ground current, only 27A per LDO. The shutdown current is near zero current which is suitable for battery-power devices. Other features include current limiting, over temperature, output short circuit protection. RT9012 is short circuit thermal folded back protected. RT9012 lowers its OTP trip point from 165C to 110C when output short circuit occurs (VOUT < 0.4V) providing maximum safety to end users. RT9012 can operate stably with very small ceramic output capacitors, reducing required board space and component cost. RT9012 is available in fixed output voltages in the WDFN-8L 2x2 package.
Applications
CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances
Ordering Information
RT9012Package Type QW : WDFN-8L 2x2 (W-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage : VOUT1/VOUT2 CM : 1.20V/2.80V, FM : 1.50V/2.80V FS : 1.50V/3.30V, GK : 1.80V/2.60V GM : 1.80V/2.80V, GP : 1.80V/3.00V GS : 1.80V/3.30V, JG : 2.50V/1.80V JM : 2.50V/2.80V, JP : 2.50V/3.00V JS : 2.50V/3.30V, JN : 2.50V/2.85V MG : 2.80V/1.80V, MM : 2.80V/2.80V NN : 2.85V/2.85V, PP : 3.00V/3.00V
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. DS9012-06 August 2007
Pin Configurations
(TOP VIEW)
VIN 1 EN1 2 EN2 3 SET 4
8
9
7 6
5
VOUT1 VOUT2 POR GND
WDFN-8L 2x2
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.
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RT9012
Typical Application Circuit
Preliminary
100K
VIN
VIN CIN 1uF Chip Enable EN1 EN2 RT9012
POR
VOUT1
COUT1 1uF COUT2 1uF
VOUT1
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CDELAY
SET GND
VOUT2
VOUT2
Functional Pin Description
Pin No. 1 2 3 4 5 6 7 8 Exposed Pad (9) Pin Name VIN EN1 EN2 SET GND POR VOUT2 VOUT1 GND Supply Input. Chip Enable1 (Active High). Chip Enable2 (Active High). Delay Set Input. Connect external capacitor to GND to set the internal delay. Common Ground. Power-On Reset Output : Open-drain output. Active low indicates an output under-voltage condition on regulator 2. Channel 2 Output Voltage. Channel 1 Output Voltage. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. Pin Function
Available Voltage Version
Code Voltage Code Voltage C 1.2 L 2.7 F 1.5 M 2.8 W 1.6 N 2.85 G 1.8 V 2.9 D 1.85 P 3 Y 1.9 Q 3.1 H 2 R 3.2 E 2.1 S 3.3 J 2.5 --K 2.6 --T 2.65 ---
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DS9012-06 August 2007
Preliminary Function Block Diagram
EN1 0.2uA Shutdown and Logic Control VIN
RT9012
VREF
-
+
MOS Driver VOUT1 Current-Limit and Thermal Protection GND
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Error Amplifier
EN2
0.2uA
Shutdown and Logic Control VREF
-
+
MOS Driver VOUT2 Current-Limit and Thermal Protection GND
Error Amplifier
SET
POR& Delay
POR
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RT9012
Absolute Maximum Ratings
Preliminary
(Note 1) 6V 6V 0.606W 165C/W 260C -65C to 150C 2kV 200V
Supply Input Voltage -----------------------------------------------------------------------------------------------------Other I/O Pin Voltages --------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C WDFN-8L 2x2 -------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) WDFN-8L 2x2, JA --------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 2) www..com HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------
Recommended Operating Conditions
(Note 3)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V Enable Input Voltage ------------------------------------------------------------------------------------------------------ 0V to 5.5V Operation Junction Temperature Range ------------------------------------------------------------------------------ -40C to 125C Operation Ambient Temperature Range ------------------------------------------------------------------------------ 0C to 85C
Electrical Characteristics
(VIN = VOUT + 1V, VEN = VIN, CIN = COUT = 1F, TA = 25C, unless otherwise specified.)
Parameter Input Voltage Dropout Voltage (Note 5)
Symbol VIN VDROP VOUT V VLINE
Test Conditions VIN = 2.5V to 5.5V IOUT = 150mA IOUT = 300mA
Min 2.5 --1.2
Typ -120 240 ----450 58 ---100 170 40
Max 5.5 --3.6 +2 0.2 0.6 700 80 1 -0.4 ----
Units V mV mV V % %/V % mA A A V ppm/C C C
Output voltage range VOUT Accuracy Line Regulation Load Regulation Current Limit Quiescent Current Shutdown Current EN Threshold Output Voltage TC Thermal Shutdown Thermal Shutdown Hysteresis
IOUT = 1mA VIN = (VOUT + 0.3V) to 5.5V or VIN > 2.5V, whichever is larger
-2 --330 --1.5 -----
VLOAD 1mA < IOUT< 300mA RLOAD = 1 IQ IQ_SD VIH VIL TSD TSD VEN > 1.5V VEN < 0.4V VIN = 2.5V to 5.5V, Power On VIN = 2.5V to 5.5V, Shutdown
To be continued
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DS9012-06 August 2007
Preliminary
Parameter PSRR ILOAD = 10mA Symbol PSRR Test Conditions f =100Hz f =1kHz f =10kHz PSRR ILOAD = 150mA Power Good
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RT9012
Min ------Typ 65 60 50 65 50 50 Max ------Units dB dB dB dB dB dB
f =100Hz PSRR f =1kHz f =10kHz
VTHL Reset Threshold VTHH POR Output Logic Low Voltage POR Leakage Current Set pin Current Source Set pin Threshold VOL IPOR
Low Threshold, % of nominal VOUT2 (Flag On) High Threshold, % of nominal VOUT2 (Flag Off) ILOW = 250uA Flag Off VSET = 0 POR = high
90 ---1 0.60 --
--0.02 0.01 1.25 1.4
-96 0.1 1 1.70 --
% % V A A V
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. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV.
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RT9012
Preliminary
Typical Operating Characteristics
Output Voltage vs. Temperature
1.9
Output Voltage vs. Temperature
3.4
RT9012-GS, VOUT1
RT9012-GS, VOUT2
Output Voltage (V)
Output Voltage (V)
1.85
3.35
1.8
3.3
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3.25
1.7 -50 -25 0 25 50 75 100 125
3.2 -50 -25 0 25 50 75 100 125
Temperature (C)
Temperature (C)
Quiescent Current vs. Temperature
70
Dropout Voltage vs. Load Current
350 300
Quiescent Current (uA)
65
Dropout Voltage (mV)
RT9012-GS VIN = VEN = 4.3V CIN = COUT1 = COUT2 = 1uF/X7R
RT9012-GS, VOUT2 TJ = 125C TJ = 25C
250 200 150 100 50
60
TJ = -40C
55
50 -50 -25 0 25 50 75 100 125
0 0 50 100 150 200 250 300
Temperature (C)
Load Current (mA)
20
PSRR
RT9011-FM, VOUT1 VIN = 4.3V 0.1V CIN = COUT1 = COUT2 = 1uF/X7R
10000 1000 100 10 1 0.1
POR Delay
RT9012-FM
0
ILOAD = 100mA ILOAD = 50mA
PSRR (dB)
-20
-40
ILOAD = 10mA
-60
POR Delay Time (ms)
-80
0.01 10
0.1 100
1 1000
10k 10000
100k 100000
1000k 1000000
0.01 0.0001
0.0010
0.0100
0.1000
1.0000
Frequency (Hz) (Hz)
POR Setting Capacitance (uF)
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DS9012-06 August 2007
Preliminary
RT9012
Line Transient Response
RT9012-GS, Both ILOAD = 10mA VIN = 3.8V to 4.8V
Line Transient Response
RT9012-GS, Both ILOAD = 1mA VIN = 3.8V to 4.8V
VIN 4.8 (V)
3.8
VIN 4.8 (V)
3.8
VOUT2 (10mV/Div)
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VOUT2 (10mV/Div) VOUT1 (10mV/Div)
(10mV/Div)
Time (100s/Div)
Time (100s/Div)
Line Transient Response
RT9012-GS, Both ILOAD = 50mA VIN = 3.8V to 4.8V
Line Transient Response
RT9012-GS, Both ILOAD = 100mA VIN = 3.8V to 4.8V
VIN 4.8 (V)
3.8
VIN 4.8 (V)
3.8
VOUT2 (10mV/Div) VOUT1 (10mV/Div)
VOUT2 (10mV/Div) VOUT1 (10mV/Div)
Time (100s/Div)
Time (100s/Div)
Load Transient Response
RT9012-GS, ILOAD = 10mA to 50mA VIN = VEN = 4.3V CIN = COUT1 = COUT2 = 1uF/X7R
Load Transient Response
RT9012-GS, ILOAD = 10mA to 100mA VIN = VEN = 4.3V CIN = COUT1 = COUT2 = 1uF/X7R
IOUT (50mA/Div) VOUT1 (20mV/Div) VOUT2 (20mV/Div) Time (250s/Div)
IOUT (100mA/Div) VOUT1 (20mV/Div) VOUT2 (20mV/Div) Time (250s/Div)
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RT9012
Start Up
RT9012-FM, VIN = 5V IOUT1 = IOUT2 = 50mA
Preliminary
EN Pin Shutdown Response
RT9012-FM, VIN = 5V IOUT1 = IOUT2 = 50mA
(5V/Div)
VEN V OUT2
(5V/Div)
V EN
VOUT2 www..com V OUT1 V OUT1
(1V/Div) Time (5s/Div)
(1V/Div) Time (50s/Div)
Power-On
RT9012-FM Both ILOAD = 10mA
Noise
RT9012-GS, No LOAD VIN = VEN = 4.5V(By battery) 150 CIN = COUT1 = COUT2 = 1uF/X7R 100
Noise (V/Div)
VEN (5V/Div) VOUT1 (1V/Div) VOUT2 (2V/Div) POR (5V/Div) Time (10s/Div)
50 0 -50 -100 -150
Time (10ms/Div)
Noise
300 200 RT9012-GS, ILOAD = 50mA VIN = VEN = 4.5V(By battery) CIN = COUT1 = COUT2 = 1uF/X7R
Noise (V/Div)
100 0 -100 -200 -300
Time (10ms/Div)
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DS9012-06 August 2007
Preliminary Applications Information
Like any low-dropout regulator, the external capacitors used with the RT9012 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1F on the RT9012 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 www..com this capacitor. The capacitor with larger value be used for 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 RT9012 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 > 20m on the RT9012 output ensures stability. The RT9012 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 RT9012 and returned to a clean analog ground. Thermal Considerations
RT9012
Thermal protection limits power dissipation in RT9012. When the operation junction temperature exceeds 170C, the OTP circuit starts the thermal shutdown function and turns the pass element off. The pass element turn on again after the junction temperature cools by 40C. RT9012 lowers its OTP trip level from 170C to 110C when output short circuit occurs (VOUT < 0.4V) as shown in Figure 2. It limits IC case temperature under 100C and provides maximum safety to customer while output short circuit occurring.
VOUT Short to GND
0.4V VOUT
IOUT
TSD 170 C 110 C OTP Trip Point 110 C IC Temperature 80 C
Region of Stable COUT ESR vs. Load Current
100
Region of Stable C OUT ESR () Region of Stable C OUT ESR ()
10
RT9012-FM, VIN = 5V CIN = COUT1 = COUT2 = 1uF/X7R Unstable Range
Figure 2. Short Circuit Thermal Folded Back Protection when Output Short Circuit Occurs (Patent) For continuous 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
1
0.1
Stable Range
0.01
Simulation Verify
0.001 0 50 100 150 200 250 300
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.
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Load Current (mA)
Figure 1. Stable Cout ESR Range
DS9012-06 August 2007
RT9012
Preliminary
For recommended operating conditions specification of RT9012, where T J(MAX) is the maximum junction temperature of the die (125C) and TA is the operated ambient temperature. The junction to ambient thermal resistance (JA is layout dependent) for WDFN-8L 2x2 package is 108C/W on the standard JEDEC 51-3 singlelayer thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula : P D(MAX) = ( 125C - 25C ) / 108 = 0.926W for www..com 2x2 packages WDFN-8L The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance JA . For RT9012 packages, the Figure 3 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed.
Power Dissipation vs. Ambient Temperature
0.8 0.7
Power Dissipation (W)
0.6 0.5 0.4 0.3 0.2 0.1 0 0 25
WDFN-8L 2x2
50
75
100
125
Ambient Temperature (C)
Figure 3. Derating Curves for RT9012 Packages
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DS9012-06 August 2007
Preliminary Outline Dimension
D2
RT9012
D
L
E
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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 0.400 0.500 0.300 0.400 Max 0.800 0.050 0.250 0.300 2.050 1.250 2.050 0.650
Dimensions In Inches Min 0.028 0.000 0.007 0.008 0.077 0.039 0.077 0.016 0.020 0.012 0.016 Max 0.031 0.002 0.010 0.012 0.081 0.049 0.081 0.026
W-Type 8L 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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