NJM2857 LOW DROPOUT VOLTAGE REGULATOR

Transcription

1 NJM87 LOW DROPOUT VOLTAGE REGULATOR GENERAL DESCRIPTION The NJM87 is a low dropout voltage regulator. This product has Reverse Current Protection without external SBD Advanced Bipolar technology achieves low noise, high ripple rejection and high supply voltage..a output current capacity,.7 F small decoupling capacitor, built-in noise bypass capacitor make the NJM87 suitable for various applications. PACKAGE OUTLINE NJM87DL FEATURES High Ripple Rejection 8dB typ. (f=khz, Vo=V Version) Output Noise Voltage Vno= Vrms typ. (Vo=V Version) Output capacitor with ceramic capacitor Output Current Io(max.)=.A High Precision Output Vo.% Low Dropout Voltage.V typ. (Io=A) ON/OFF Control Internal Reverse Current Protection Internal Thermal Overload Protection Internal Over Current Protection Bipolar Technology Package Outline TO-- PIN CONFIGURATION NJM87DL BLOCK DIAGRAM.CONTROL..GND..NC CONTROL Reverse Current Protection Thermal Protection Bandgap Reference Current Limit GND Ver

2 NJM87 OUTPUT VOLTAGE Device Name NJM87DL-.V NJM87DL-.V NJM87DL-.V NJM87DL-.V NJM87DL-.V Output voltage options available :. ~.V (.V step) ABSOLUTE MAXIMUM RATINGS (Ta= C) PARAMETER SYMBOL RATINGS UNIT Input Voltage + V Control Voltage V CONT + V Output Terminal Voltage V o.max Vo+ V Power Dissipation P D 9(*) (*) mw Operating Temperature Topr - + C Storage Temperature Tstg - + C (*): Mounted on glass epoxy board. (7...mm: based on EIA/JDEC standard size, Layers, Cu area mm ) (*): Mounted on glass epoxy board. (7...mm: based on EIA/JDEC standard, Layers) (For Layers: Applying 7. 7.mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD-) Operating voltage =+.V(In case of Vo<.V) ~ +8.V POWER DISSIPATION vs. AMBIENT TEMPERATURE Power Dissipation: P D (mw) NJM87DL (TO--) Power Dissipation (Topr = -ºC to +ºC, Tj=ºC) on layers board on layers board Temperature: (ºC) - - Ver.7--

3 NJM87 ELECTRICAL CHARACTERISTICS ( =Vo+V(Vo<.V: =.V), C IN =. F, Co=.7 F(.7V<Vo.V: Co= F, Vo.7V: Co=uF), Ta= C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Output Voltage Vo Io=mA -.% - +.% V Input Voltage V Quiescent Current I Q Io=mA - 7 A Quiescent Current at Control OFF I Q (OFF) V CONT =V - - na Output Current Io Vo.9V - ma Line Regulation Vo/ =Vo+V Vo+V (Vo V), =Vo+V +8V(Vo>V), - -. %/V Io=mA Load Regulation Vo/ Io Io= ma - -. %/ma Dropout Voltage(*) V I -O Io=mA -.. V Vo=.V Ripple Rejection(*) Average Temperature Coefficient of Output Voltage RR ein=mvrms, f=khz, Io=mA Vo=.V Vo=.V Vo=.V Vo=.V Vo/ Ta Ta= 8 C, Io=mA - - ppm/ C Vo=.V - - Output Noise Voltage V NO Vo=.V - - f=hz 8kHz, Vo=.V Io=mA, Vo=.V - - Vo=.V Control Current I CONT V CONT =.V - A Control Voltage for ON-state V CONT(ON). - - V Control Voltage for OFF-state V CONT(OFF) - -. V (*): The output voltage excludes under.v (*): Vo>.V: =Vo+V, Vo.V: =.V The above specification is a common specification for all output voltages. Therefore, it may be different from the individual specification for a specific output voltage. db Vrms Ver

4 NJM87 TEST CIRCUIT A I IN.μF NJM87 (*).7μF (ceramic) I OUT V A I CONT CONTROL V V CONT GND (*).7V<Vo.V version:co= F (ceramic) Vo.7V version:co=μf (ceramic) TYPICAL APPLICATIONS In the case where ON/OFF Control is not required:.μf NJM87 (*).7μF R CONTROL GND (*).7V<Vo.V version: Co= F Vo.7V version:co= F Connect CONTROL pin to pin. In use of ON/OFF CONTROL:.μF NJM87 (*7).7μF R CONTROL GND (*7).7V<Vo.V version: Co= F Vo.7V version:co= F State of CONTROL pin: H output is enabled. L or open output is disabled. - - Ver.7--

5 NJM87 *In the case of using a resistance "R" between and control. If this resistor is inserted, the control current could be reduced when the control voltage is high. The applied voltage to control pin should set to consider voltage drop through the resistor R and the minimum control voltage for ON-state. The V CONT (ON) and I CONT have temperature dependence as shown in the "Control Current vs. Temperature" and " Control Voltage vs. Temperature" characteristics. Therefore, the resistor "R" should be selected to consider the temperature characteristics. *Input Capacitor C IN Input Capacitor C IN is required to prevent oscillation and reduce power supply ripple for applications when high power supply impedance or a long power supply line. Therefore, use the recommended C IN value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger and should connect between GND and as shortest path as possible to avoid the problem. *Output Capacitor C O Output capacitor (C O ) will be required for a phase compensation of the internal error amplifier. The capacitance and the equivalent series resistance (ESR) influence to stable operation of the regulator. Use of a smaller C O may cause excess output noise or oscillation of the regulator due to lack of the phase compensation. On the other hand, Use of a larger C O reduces output noise and ripple output, and also improves output transient response when rapid load change. Therefore, use the recommended C O value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger and should connect between GND and as shortest path as possible for stable operation The recommended capacitance depends on the output voltage rank. Especially, low voltage regulator requires larger C O value. In addition, you should consider varied characteristics of capacitor (a frequency characteristic, a temperature characteristic, a DC bias characteristic and so on) and unevenness peculiar to a capacitor supplier enough. When selecting C O, recommend that have withstand voltage margin against output voltage and superior temperature characteristic though this product is designed stability works with wide range ESR of capacitor including low ESR products. *Reverse Current Protection NJM87 is built in Reverse Current Protection circuit. So external Schottky barrier diode(sbd) is not required that this circuit prevents the large reverse current due to the output voltage being higher than the input voltage. Ver

6 NJM87 TYPICAL CHARACTERISTICS Output Voltage vs. Input Voltage Cin=.uF(Ceramic) Output Voltage vs. Output Current ma ma ma ma Input Voltage : (V) Vin=V Output Current : Io(mA) 8 Ground Pin Current vs. Output Current VIN=.V... Dropout Voltage vs. Output Current..... Output Current : I O(mA) Output Current:Io(mA) Control Current vs. Control Voltage Rc=k Vin=.V Rc= Output Voltage vs. Control Voltage Rc=kΩ Rc=kΩ Rc=Ω Rc=k.... Control Voltage : V Cont (V) Vin=.V Io=mA.. Control Voltage : V Cont (V) - - Ver.7--

7 NJM87 Load Regulation vs. Output Current Peak Output Current vs. Input Voltage VIN=.V 8 Output Current : Io(mA) 8 Vo=VoX.9 Measure Delay=msec Input Voltage : (V) Quiescent Current vs. Input Voltage Output : No load. Including icont 8 Output Noise Voltage vs. Output Current VIN=.V LPF:8kHz 8 Input Voltage : (V)... Output Current : Io(mA) 9 Ripple Rejection Ratio vs. Frequency Io=mA Io=mA Io=mA 9 Ripple Rejection vs. Output Current f=khz o Io=mA C VIN=V ein=mvrms Io=mA Io=mA k k k Frequency : f (Hz) VIN=V ein=mvrms... Output Current : Io(mA) Ver

8 NJM87 Equivalent Serise Resistance vs. Output Current.. Dropout Voltage vs. =ma.. STABLE :Ta= o C Vin=Vo+V.... Output Current : Io(mA). -.. Output Voltage vs. Io=mA Control Voltage vs. Io=mA Control Current vs. Output : No Load Co=.7uF Vcont=.V Quiescent Current vs. Input Voltage Output : No Load Icont : Excluded Co=.7uF Ver.7--

9 NJM87 Short Circuit Current vs. VIN=.V Output is short to ground. Line Regulation vs. Io=mA Load Regulation vs. Io=-mA Output Peak Current vs. Temperature... Cin=uF(Ceramic) - Output Voltage vs. Io=mA Co=.7uF - Ver

10 NJM87 7 ON/OFF Transient Response Without Load 7. 7 ON/OFF Transient Response 7. Control Voltage. Control Voltage. Output Volatage:Vo(V) Output Voltage -. C Vin=V - Io=mA Co=.7uF Control Voltage:Vcont(V) Output Voltage:Vo(V) Output C Vin=V Io=mA Co=.7uF Control Voltage:Vcont(V) - Time:t(s) Time:t(ms) -. Load Transient Response. Input Transient Response 8 Output Voltage:Vo(V)..... Output Current.9 Output Voltage C Vin=V.8 Io=- - ma.7-8 Time:t(μs) - - Output CurrentIo(mA) Output Voltage:Vo(V) Input Voltage Output Voltage 8 C Io=mA Co=.7uF 7 Input Voltage:Vin(V) [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. - - Ver.7--