 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| RT9168/A 200mA/500mA Fixed Output Voltage LDO Regulator General Description The RT9168/A is a 200mA/500mA low dropout and micropower regulator suitable for portable applications. The output voltages range from 1.5V to 5.0V in 100mV increments and 2% accuracy. The RT9168/A is designed for use with very low ESR capacitors. The output remains stable even with a 1F ceramic output capacitor. The RT9168/A uses an 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-powered devices. Other features include current limiting and over temperature protection. The SOP-8 and SOT-25 packages are also available for larger power dissipation and design flexibility. 1 2 3 Features Stable with Low-ESR Output Capacitor Low Dropout Voltage (220mV at 200mA) Low Operation Current - 80A Typical Shutdown Function Low Temperature Coefficient Current and Thermal Limiting Custom Voltage Available SOT-25 and SOP-8 Packages Pin Configurations Part Number RT9168/ACBR Pin Configurations TOP VIEW 5 4 (Plastic SOT-25) 1. 2. 3. 4. 5. OUT GND IN SHDN NC Applications Cellular Telephones Laptop, Notebook, and Palmtop Computers Battery-powered Equipment Hand-held Equipment RT9168/ART9168/A- CS CSH OUT 1 GND 2 GND 3 NC 4 TOP VIEW 8 IN 7 GND 6 GND 5 SHDN/SHDN (Plastic SOP-8) Ordering Information RT9168/APackage type BR : SOT-25 S : SOP-8 SH : SOP-8, High shutdown 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 DS9168/A-03 May 2001 Typical Application Circuit RT9168 VIN CIN 1F IN GND SHDN SHDN NC OUT COUT 1F VOUT www.richtek-ic.com.tw 1 RT9168/A Marking Information Part Number RT9168-15CBR RT9168-16CBR RT9168-17CBR RT9168-18CBR RT9168-19CBR RT9168-20CBR RT9168-21CBR RT9168-22CBR RT9168-23CBR RT9168-24CBR RT9168-25CBR RT9168-26CBR RT9168-27CBR RT9168-28CBR RT9168-29CBR RT9168-30CBR RT9168-31CBR RT9168-32CBR RT9168-33CBR RT9168-34CBR RT9168-35CBR RT9168-36CBR RT9168-37CBR RT9168-38CBR RT9168-39CBR RT9168-40CBR RT9168-41CBR RT9168-42CBR RT9168-43CBR RT9168-44CBR RT9168-45CBR RT9168-46CBR RT9168-47CBR RT9168-48CBR RT9168-49CBR RT9168-50CBR www.richtek-ic.com.tw Marking L0 L1 L2 L3 L4 L5 L6 L7 L8 L9 LA LB LC LD LE LF LG LH LJ LK LL LM LN LP LQ LR LS LT LU LV LW LX LY LZ CL CM Part Number RT9168A-15CBR RT9168A-16CBR RT9168A-17CBR RT9168A-18CBR RT9168A-19CBR RT9168A-20CBR RT9168A-21CBR RT9168A-22CBR RT9168A-23CBR RT9168A-24CBR RT9168A-25CBR RT9168A-26CBR RT9168A-27CBR RT9168A-28CBR RT9168A-29CBR RT9168A-30CBR RT9168A-31CBR RT9168A-32CBR RT9168A-33CBR RT9168A-34CBR RT9168A-35CBR RT9168A-36CBR RT9168A-37CBR RT9168A-38CBR RT9168A-39CBR RT9168A-40CBR RT9168A-41CBR RT9168A-42CBR RT9168A-43CBR RT9168A-44CBR RT9168A-45CBR RT9168A-46CBR RT9168A-47CBR RT9168A-48CBR RT9168A-49CBR RT9168A-50CBR Marking M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 MA MB MC MD ME MF MG MH MJ MK ML MM MN MP MQ MR MS MT MU MV MW MX MY MZ CN CP DS9168/A-03 May 2001 2 RT9168/A Pin Description Pin Name IN GND SHDN (SHDN) NC OUT Pin Function Input Ground Active Low (High) Shutdown Input No Connection Output Function Block Diagram SHDN or SHDN VREF + _ Error Amp MOS Driver Current-Limit and Thermal Protection GND OUT Shutdown and Logic Control IN DS9168/A-03 May 2001 www.richtek-ic.com.tw 3 RT9168/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 RT9168 RT9168A RT9168 RT9168A RT9168/A GND Pin Current RT9168 RT9168A RT9168/A (Note) Dropout Voltage RT9168/A (VOUT(Nominal)3.0V RT9168/A Version) RT9168A Line Regulation Load Regulation IG Symbol VIN VOUT IMAX ILIMIT RLOAD = 1 Ohm No Load IOUT = 200mA IOUT = 500mA IOUT = 1mA VDROP IOUT = 50mA IOUT = 200mA IOUT = 500mA VLINE VLOAD 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 VOUT = 0V F = 100Hz, CBP = 10nF, COUT = 10F Test Conditions Min 2.9 IL = 50mA IL = 1mA 2.7 -2 200 500 ----------0.2 --2.2 -----Typ -----300 700 80 90 90 1.1 55 220 600 -0.01 0.01 ---0.01 155 58 Max 7 7 +2 ----150 150 150 5 100 300 750 +0.2 0.04 0.04 -0.4 100 1 --mV mV mV mV %/V %/mA V V nA A C dB A Units V % mA mA mA mA SHDN, SHDN Input High Threshold VIH SHDN, SHDN Input Low Threshold SHDN, SHDN Bias Current Shutdown Supply Current Thermal Shutdown Temperature Ripple Rejection VIL ISD IGSD TSD PSRR Notes: Dropout voltage definition: VIN - VOUT when VOUT is 50 mV below the value of VOUT at VIN = VOUT + 0.5V www.richtek-ic.com.tw DS9168/A-03 May 2001 4 RT9168/A Typical Operating Charateristics Output Voltage vs. Temp. 3.33 3.32 120 105 GND Current vs. Temp. Output Voltage (V) 3.31 3.30 3.29 3.28 3.27 3.26 3.25 -50 -25 0 25 50 75 GND Current ( A) 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 C Temperature (C )) Temperature ( C ) 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 RT9168 VOUT = 3.3V 100 125 150 Output Current (mA) Temperature (C ) (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) RT9168A VOUT = 3.3V 100 125 150 40 30 20 10 0 10 10 ILOAD = 1mA, COUT = 4.7F VOUT = 3.3V 100 100 1K 1000 10K 10000 100K 100000 1M 100000 Temperature (C ) ) Frequency (KHz) DS9168/A-03 May 2001 www.richtek-ic.com.tw 5 RT9168/A Load Transient Response 60 Output Voltage Deviation (mV) Load Transient Response 60 Output Voltage Deviation (mV) COUT = 1F 40 CIN = 10F 20 02 > -20 T T VOUT = 3.0V VIN = 4V COUT = 4.7F 40 CIN = 10F 20 02 > -20 T T 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) 150 Output Voltage (mV) Line Transient Response COUT = 1F Loading = 1mA T T Line Transient Response 150 COUT = 1F Loading = 50mA T T 100 VOUT = 3.0V 50 02 > -50 100 VOUT = 3.0V 50 02 > -50 Input Voltage (V) 5 4 1 Input Voltage (V) T T 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 COUT = 4.7F Loading = 50mA T T 100 VOUT = 3.0V 50 0 -50 2> 40 VOUT = 3.0V 20 0 -20 2> Input Voltage (V) 5 4 1 Input Voltage (V) T T 5 4 1 Time (500S/Div) Time (500S/Div) www.richtek-ic.com.tw DS9168/A-03 May 2001 6 RT9168/A Applications Guides Capacitor Selection and Regulator Stability Like any low-dropout regulator, the external capacitors used with the RT9168/A must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1F on the RT9168/A input and the amount of capacitance can be increased without limit. The input capacitor must be located 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 LDO applications. The RT9168/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 1F with ESR is > 5m on the RT9168/A output ensures stability. The RT9168/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 RT9168/A and returned to a clean analog ground. 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. 0.001 0 40 80 120 160 200 Region of Stable COUT ESR vs. Load Current 100 COUT = 4.7F 10 COUT ESR (m) () COUT = 1F 1 0.1 0.01 Load Current (mA) Fig. 1 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. Load-Transient Considerations The RT9168/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 RT9168/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). DS9168/A-03 May 2001 www.richtek-ic.com.tw 7 RT9168/A 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 RT9168/A input voltage or another logic supply. The high-level voltage may exceed the RT9168/A input voltage, but must remain within the absolute maximum ratings for the SHDN pin. Internal P-Channel Pass Transistor The RT9168/A features a typical 1.1 P-channel MOSFET pass transistor. It provides several Fig. 2 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 RT9168/A does not 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 RT9168/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 RT9168/A has an inherent diode connected between the regulator input and output (see Fig.2). 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 www.richtek-ic.com.tw VIN VOUT VIN VOUT 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.3). 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. Fig. 3 Current Limit and Thermal Protection The RT9168 includes a current limit which monitors and controls the pass transistor's gate voltage limiting the output current to 300mA Typ. (700mA Typ. for RT9168A). Thermal-overload protection limits total power dissipation in the RT9168/A. When the junction 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 conditions. Thermal-overloaded protection is designed to protect the RT9168/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 DS9168/A-03 May 2001 8 RT9168/A indefinite amount of time without damaging the part by cooperation of current limit and thermal protection. Operating Region and Power Dissipation The maximum power dissipation of RT9168/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 RT9168/A die junction and the surrounding environment, JA is the thermal resistance from the junction to the surrounding environment. The GND pin of the RT9168/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. DS9168/A-03 May 2001 www.richtek-ic.com.tw 9 RT9168/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 www.richtek-ic.com.tw DS9168/A-03 May 2001 10 RT9168/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 DS9168/A-03 May 2001 www.richtek-ic.com.tw 11 RT9168/A RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw DS9168/A-03 May 2001 www.richtek-ic.com.tw 13 |
Price & Availability of RT9168A-17CSH
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |