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RT9167/A
Low-Noise, Fixed Output Voltage, 200mA/500mA LDO Regulator
General Description
The RT9167/A is a 200mA/500mA low dropout and low noise micropower regulator suitable for portable applications. The output voltages range from 1.5V to 5.0V in 100mV increments and 2% accuracy. The RT9167/A is designed for use with very low ESR capacitors. The output remains stable even with 1F ceramic output capacitor. The RT9167/A uses and internal PMOS as the pass device, which does not cause extra GND current in heavy load and dropout conditions. The shutdown mode of nearly zero operation current makes the IC suitable for battery-power devices. Other features include a reference bypass pin to improve low noise performance, current limiting, and over temperature protection.
Features
Stable with Low-ESR Output Capacitor Low Dropout Voltage (220mV and 200mA) Low Operation Current - 80A Typical Shutdown Function Low Noise Output Low Temperature Coefficient Current and Thermal Limiting Custom Voltage Available SOT-25 and SOP-8 Packages
Applications
Cellular Telephones Laptop, Notebook, and Palmtop Computers Battery-powered Equipment Hand-held Equipment
Ordering Information
RT9167/APackage type B : SOT-25 Type I BR : SOT-25 Type II S : SOP-8 Operating temperature range C: Commercial standard Output voltage 15 : 1.5V 16 : 1.6V : : 49 : 4.9V 50 : 5.0V 500mA Output current 200mA Output current
Pin Configurations
Part Number RT9167/ACB Pin Configurations
TOP VIEW
5 4
(Plastic SOT-25)
1
2
3
1. 2. 3. 4. 5.
IN GND SHDN BP OUT
RT9167/A-
CBR
TOP VIEW
5 4
(Plastic SOT-25)
1
2
3
1. 2. 3. 4. 5.
OUT GND IN SHDN BP
RT9167/A-
CS
SHDN 1 IN 2 OUT 3 BP 4
TOP VIEW
8 GND 7 GND 6 GND 5 GND
(Plastic SOP-8)
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RT9167/A
Marking Information
Part Number RT9167-15CB RT9167-16CB RT9167-17CB RT9167-18CB RT9167-19CB RT9167-20CB RT9167-21CB RT9167-22CB RT9167-23CB RT9167-24CB RT9167-25CB RT9167-26CB RT9167-27CB RT9167-28CB RT9167-29CB RT9167-30CB RT9167-31CB RT9167-32CB RT9167-33CB RT9167-34CB RT9167-35CB RT9167-36CB RT9167-37CB RT9167-38CB RT9167-39CB RT9167-40CB RT9167-41CB RT9167-42CB RT9167-43CB RT9167-44CB RT9167-45CB RT9167-46CB RT9167-47CB RT9167-48CB RT9167-49CB Marking E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF EG EH EJ EK EL EM EN EP EQ ER ES ET EU EV EW EX EY EZ AR Part Number RT9167-50CB RT9167A-15CB RT9167A-16CB RT9167A-17CB RT9167A-18CB RT9167A-19CB RT9167A-20CB RT9167A-21CB RT9167A-22CB RT9167A-23CB RT9167A-24CB RT9167A-25CB RT9167A-26CB RT9167A-27CB RT9167A-28CB RT9167A-29CB RT9167A-30CB RT9167A-31CB RT9167A-32CB RT9167A-33CB RT9167A-34CB RT9167A-35CB RT9167A-36CB RT9167A-37CB RT9167A-38CB RT9167A-39CB RT9167A-40CB RT9167A-41CB RT9167A-42CB RT9167A-43CB RT9167A-44CB RT9167A-45CB RT9167A-46CB RT9167A-47CB RT9167A-48CB Marking AS J0 J1 J2 J3 J4 J5 J6 J7 J8 J9 JA JB JC JF JE JD JG JH JJ JK JL JM JN JP JQ JR JS JT JU JV JW JX JY JZ
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RT9167/A
Part Number RT9167A-49CB RT9167A-50CB RT9167-15CBR RT9167-16CBR RT9167-17CBR RT9167-18CBR RT9167-19CBR RT9167-20CBR RT9167-21CBR RT9167-22CBR RT9167-23CBR RT9167-24CBR RT9167-25CBR RT9167-26CBR RT9167-27CBR RT9167-28CBR RT9167-29CBR RT9167-30CBR RT9167-31CBR RT9167-32CBR RT9167-33CBR RT9167-34CBR RT9167-35CBR RT9167-36CBR RT9167-37CBR RT9167-38CBR RT9167-39CBR RT9167-40CBR RT9167-41CBR RT9167-42CBR RT9167-43CBR RT9167-44CBR RT9167-45CBR RT9167-46CBR RT9167-47CBR RT9167-48CBR RT9167-49CBR
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Marking CA CB I0 I1 I2 I3 I4 I5 I6 I7 I8 I9 IA IB IC ID IE IF IG IH IJ IK IL IM IN IP IQ IR IS IT IU IV IW IX IY IZ CY
Part Number RT9167-50CBR RT9167A-15CBR RT9167A-16CBR RT9167A-17CBR RT9167A-18CBR RT9167A-19CBR RT9167A-20CBR RT9167A-21CBR RT9167A-22CBR RT9167A-23CBR RT9167A-24CBR RT9167A-25CBR RT9167A-26CBR RT9167A-27CBR RT9167A-28CBR RT9167A-29CBR RT9167A-30CBR RT9167A-31CBR RT9167A-32CBR RT9167A-33CBR RT9167A-34CBR RT9167A-35CBR RT9167A-36CBR RT9167A-37CBR RT9167A-38CBR RT9167A-39CBR RT9167A-40CBR RT9167A-41CBR RT9167A-42CBR RT9167A-43CBR RT9167A-44CBR RT9167A-45CBR RT9167A-46CBR RT9167A-47CBR RT9167A-48CBR RT9167A-49CBR RT9167A-50CBR
Marking CZ K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 KA KB KC KD KE KF KG KH KJ KK KL KM KN KP KQ KR KS KT KU KV KW KX KY KZ CC CD
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RT9167/A
Pin Description
Pin Name IN GND SHDN BP OUT Pin Function Input Ground Active Low Shutdown Input Reference Noise Bypass Output
Function Block Diagram
SHDN
Shutdown and Logic Control VREF +
IN
BP
MOS Driver Current-Limit and Thermal Protection GND OUT
Error Amp
Typical Application Circuit
VIN CIN 1F ON OFF
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_
RT9167 IN OUT GND SHDN BP CBP 10nF COUT 1F
VOUT
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RT9167/A
Absolute Maximum Ratings
Input Voltage Power Dissipation, PD @ TA = 25C SOT-25 SOP-8 Operating Junction Temperature Range Storage Temperature Range Package Thermal Resistance SOT-25, JA SOP-8, JA Lead Temperature (Soldering, 5 sec.) 250C/W 160C/W 260C 0.25W 0.625W -40C to 125C -65C to 150C 8V
Electrical Characteristics
(VIN = 5.0V, CIN = 1F, COUT = 1F, TA = 25C, unless otherwise specified) Parameter Input Voltage Range Output Voltage Accuracy Maximum Output Current Current Limit RT9167 RT9167A RT9167 RT9167A RT9167/A GND Pin Current RT9167 RT9167A RT9167/A (Note) Dropout Voltage RT9167/A (VOUT(Nominal)3.0V RT9167/A Version) RT9167A Line Regulation Load Regulation RT9167 RT9167A IG Symbol VIN VOUT IMAX ILIMIT RLOAD = 1 No Load IOUT = 200mA IOUT = 500mA IOUT = 1mA VDROP IOUT = 50mA IOUT = 200mA IOUT = 500mA VLINE VLOAD VIH VIL ISD IGSD TSD eNO PSRR CBP = 10nF, COUT = 10F F = 100Hz, CBP = 10nF, COUT = 10F VOUT = 0V VIN = (VOUT+0.15) to 7V, IOUT = 1mA IOUT = 0mA to 200mA IOUT = 0mA to 500mA VIN = 3V to 5.5V VIN = 3V to 5.5V Test Conditions Min 2.9 IL = 50mA IL = 1mA 2.7 -2 200 500 ----------0.2 --1.6 ------Typ -----300 700 80 90 90 1.1 55 220 600 -0.01 0.01 ---0.01 155 350 58 Max 7 7 +2 ----150 150 150 5 100 300 750 +0.2 0.04 0.04 -0.4 100 1 ---%/V %/mA V V nA A C nV Hz dB mV A Units V % mA mA
SHDN Input High Threshold SHDN Input Low Threshold SHDN Bias Current Shutdown Supply Current Thermal Shutdown Temperature Output Noise Ripple Rejection
Notes: Dropout voltage definition: VIN - VOUT when VOUT is 50 mV below the value of VOUT at VIN = VOUT + 0.5V
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RT9167/A
Typical Operating Charateristics
Output Voltage vs. Temp.
3.33 3.32 120 105
GND Current vs. Temp.
GND Current ( A)
Output Voltage (V)
3.31 3.30 3.29 3.28 3.27 3.26 3.25 -50 -25 0 25 50 75
90 75 60 45 30 15
VOUT = 3.3V
100 125 150
0 -50 -25 0 25 50 75
VOUT = 3.3V
100 125 150
Temperature (C)
Temperature ( C)
Dropout Voltage vs. Output Current
300 250 480
Current Limit vs. Temp.
420
85C 25C -40C Current Limit (mA)
Dropout Voltage (mV) (V)
360 300 240 180 120 60
200 150 100 50 0 0 25 50 75 100 125
VOUT = 3.3V
150 175 200
0 -50 -25 0 25 50 75
RT9167 VOUT = 3.3V
100 125 150
Output Current (mA)
Temperature (C )
Current Limit vs. Temp.
900 800
70 60 50
PSRR
Current Limit (mA)
700 600 500 400 300 200 100 -50 -25 0 25 50 75
PSRR (dB)
40 30 20
RT9167A VOUT = 3.3V
100 125 150
10 0 10 10
ILOAD = 1mA, COUT = 4.7F VOUT = 3.3V, CBP = 10nF
100 100 1K 1000 10K 10000 100K 100000 1M 1000000
Temperature ( C )
Frequency (KHz)
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RT9167/A
Load Transient Response
60 Output Voltage Deviation (mV) Output Voltage Deviation (mV)
Load Transient Response
60
COUT = 1F 40 CIN = 10F CBP = 10nF 20
02 > -20
T T
VOUT = 3.0V VIN = 4V
COUT = 4.7F CBP = 10nF
T T
40 CIN = 10F 20 02 > -20
VOUT = 3.0V VIN = 4V
T
Load Current (mA)
T
Load Current (mA)
50 11 > -50
50 11 > -50
Time (50S/Div)
Time (50S/Div)
Output Voltage (mV)
Output Voltage (mV)
Line Transient Response
150
Line Transient Response
150
COUT = 1F Loading = 1mA
T T
CBP = 10nF
COUT = 1F Loading = 50mA
T T
CBP = 10nF
100 VOUT = 3.0V 50 02 > -50
100 VOUT = 3.0V 50 02 > -50
Input Voltage (V)
Input Voltage (V)
T
T
5 4
1
5 4
1
Time (1mS/Div)
Time (1mS/Div)
Output Voltage (mV)
150
Output Voltage (mV)
Line Transient Response
COUT = 4.7F Loading = 1mA
T T
Line Transient Response
60
CBP = 10nF
COUT = 4.7F Loading = 50mA
T T
CBP = 10nF
100 VOUT = 3.0V 50 0 -50
2>
40 VOUT = 3.0V 20 02 > -20
Input Voltage (V)
5 4
1
Input Voltage (V)
T
T
5 4
1
Time (500S/Div)
Time (500S/Div)
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RT9167/A
Applications Guides
Capacitor Selection and Regulator Stability Like any low-dropout regulator, the external capacitors used with the RT9167/A must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1F on the RT9167/A 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" 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 RT9167/A is designed specifically to work with low ESR ceramic output capacitor in spacesaving and performance consideration. Using a ceramic capacitor whose value is at least 1uF with ESR is > 5m on the RT9167/A output ensures stability. The RT9167/A still works well with output capacitor of other types due to the wide stable ESR range. Fig.1 shows the curves of allowable ESR range as a function of load current for various output voltages and 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" from the VOUT pin of the RT9167/A and returned to a clean analog ground.
0.001 0 40 80 120 160 200 10
Region of Stable COUT ESR vs. Load Current
100
COUT = 4.7F COUT = 1F
COUT ESR (m) ()
1
0.1
0.01
Load Current (mA)
Fig. 1 Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. It may be necessary to use 2.2F or more to ensure stability at temperatures below -10C in this case. Also, tantalum capacitors, 2.2F or more may be needed to maintain capacitance and ESR in the stable region for strict application environment. Tantalum capacitors maybe suffer failure due to surge current when it is connected to a low-impedance source of power (like a battery or very large capacitor). If a tantalum capacitor is used at the input, it must be guaranteed to have a surge current rating sufficient for the application by the manufacture. Use a 10nF bypass capacitor at BP for low output voltage noise. The capacitor, in conjunction with an internal 200K resistor, which connects bypass pin and the band-gap reference, creates an 80Hz lowpass filter for noise reduction. Increasing the capacitance will slightly decrease the output noise, but increase the start-up time. The capacitor connected to the bypass pin for noise reduction must have very low leakage. This capacitor leakage current causes the output voltage to decline by a proportional amount to the current due to the voltage drop on the internal 200K resistor. Fig. 2 shows the power on response.
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RT9167/A
Internal P-Channel Pass Transistor
CBP = 1nF
The RT9167/A features a typical 1.1 P-channel MOSFET pass transistor. It provides several advantages over similar designs using PNP pass transistors, including longer battery life. The P-channel MOSFET requires no base drive, which reduces quiescent current considerably. PNP-based regulators waste considerable current in dropout when the pass transistor saturates. They also use high base-drive currents under large loads. The RT9167/A does not
VOUT = 3.0V
Voltage (0.5V / DIV)
CBP = 10nF
suffer from these problems and consume only 80A of quiescent current whether in dropout, light-load, or heavy-load applications. Input-Output (Dropout) Voltage A regulator's minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this will determine the useful end-of-life battery voltage. Because the RT9167/A uses a Pchannel MOSFET pass transistor, the dropout voltage is a function of drain-to-source on-resistance [RDS(ON)] multiplied by the load current. Reverse Current Path The power transistor used in the RT9167/A has an inherent diode connected between the regulator input and output (see Fig.3). If the output is forced above the input by more than a diode-drop, this diode will become forward biased and current will flow from the VOUT terminal to VIN. This diode will also be turned on by abruptly stepping the input voltage to a value below the output voltage. To prevent regulator mis-operation, a Schottky diode should be used in any applications where input/output voltage conditions can cause the internal diode to be turned on (see Fig.4). As shown, the Schottky diode is connected in parallel with the internal parasitic diode and prevents it from being turned on by limiting the voltage drop across it to about 0.3V. < 100 mA to prevent damage to the part.
0
5.0
10.0
15.0
Time (ms)
Fig. 2
Load-Transient Considerations The RT9167/A load-transient response graphs (see Typical Operating Characteristics) show two components of the output response: a DC shift from the output impedance due to the load current change, and the transient response. The DC shift is quite small due to the excellent load regulation of the IC. Typical output voltage transient spike for a step change in the load current from 0mA to 50mA is tens mV, depending on the ESR of the output capacitor. Increasing the output capacitor's value and decreasing the ESR attenuates the overshoot. Shutdown Input Operation The RT9167/A is shutdown by pulling the SHDN input low, and turned on by driving the input high. If this feature is not to be used, the SHDN input should be tied to VIN to keep the regulator on at all times (the SHDN input must not be left floating). To ensure proper operation, the signal source used to drive the SHDN input must be able to swing above and below the specified turn-on/turn-off voltage thresholds which guarantee an ON or OFF state (see Electrical Characteristics). The ON/OFF signal may come from either CMOS output, or an open-collector output with pull-up resistor to the RT9167/A input voltage or another logic supply. The high-level voltage may exceed the RT9167/A input voltage, but must remain within the absolute maximum ratings for the SHDN pin.
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RT9167/A
Current Limit and Thermal Protection The RT9167 includes a current limit which monitors
VIN VOUT
and controls the pass transistor's gate voltage limiting the output current to 300mA Typ. (700mA Typ. for RT9167A). Thermal-overload protection limits total power dissipation in the RT9167/A. When the junction
Fig. 3
temperature exceeds TJ = +155C, the thermal sensor signals the shutdown logic turning off the pass transistor and allowing the IC to cool. The thermal sensor will turn the pass transistor on again after the IC's junction temperature cools by 10C, resulting in a pulsed output during continuous thermal-overload
VIN
VOUT
conditions. Thermal-overloaded protection is designed to protect the RT9167/A in the event of fault conditions. Do not exceed the absolute maximum junctiontemperature rating of TJ = +150C for continuous operation. The output can be shorted to ground for an indefinite amount of time without damaging the part by cooperation of current limit and thermal protection.
Fig. 4
Operating Region and Power Dissipation The maximum power dissipation of RT9167/A depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipation across the device is P = IOUT (VIN - VOUT). The maximum power dissipation is: PMAX = (TJ - TA) /JA where TJ - TA is the temperature difference between the RT9167/A die junction and the surrounding environment, JA is the thermal resistance from the junction to the surrounding environment. The GND pin of the RT9167/A performs the dual function of providing an electrical connection to ground and channeling heat away. Connect the GND pin to ground using a large pad or ground plane.
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RT9167/A
Package Information
D
C
B
b
A e L
H
A1
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 0.102 0.356 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 0.004 0.014 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT- 25 Surface Mount Package
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RT9167/A
H A M
JB
F
C D I
Symbol A B C D F H I J M
Dimensions In Millimeters Min 4.801 3.810 1.346 0.330 1.194 0.178 0.102 5.791 0.406 Max 5.004 3.988 1.753 0.508 1.346 0.254 0.254 6.198 1.270
Dimensions In Inches Min 0.189 0.150 0.053 0.013 0.047 0.007 0.004 0.228 0.016 Max 0.197 0.157 0.069 0.020 0.053 0.010 0.010 0.244 0.050
8-Lead SOP Plastic Package
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RT9167/A
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