LOW DROPOUT VOLTAGE REGULATOR
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- Colin Hood
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1 LOW DROPOUT VOLTAGE REGULATOR GENERAL DESCRIPTION The NJM888 is a low dropout voltage regulator with ON/OFF control. Advanced Bipolar technology achieves low noise, high ripple rejection and low quiescent current. Small packaging,.µf small decoupling capacitor and built-in noise bypass capacitor less make the NJM888 suitable for space conscious applications. PACKAGE OUTLINE NJM888F NJM888KF FEATURES High Ripple Rejection 7dB typ. (f=khz, Vo=V Version) Low Output Noise Voltage Vno=µVrms typ. Output capacitor with.µf ceramic capacitor (Vo.7V) Output Current Io(max.)=mA High Precision Output Vo±.% Low Dropout Voltage.V typ. (Io=mA) ON/OFF Control Internal Thermal Overload Protection Internal Short Circuit Current Limit Bipolar Technology Package Outline SOT--(NJM888F) / ESON(NJM888KF) PIN CONFIGURATION. CONTROL (Active High). GND. N.C... NJM888F.. GND. CONTROL. NJM888KF EQUIVALENT CIRCUIT CONTROL Thermal Protection Bandgap Reference GND Ver
2 OUTPUT VOLTAGE RANK LIST The WHITE column shows applicable Voltage Rank(s) Device Name V out Device Name V out NJM888F.V NJM888F.V NJM888F6.6V NJM888F6.6V NJM888F7.7V NJM888F7.7V NJM888F8.8V NJM888F8.8V NJM888F9.9V NJM888F9.9V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F6.6V NJM888F6.6V NJM888F7.7V NJM888F7.7V NJM888F8.8V NJM888F8.8V NJM888F9.9V NJM888F9.9V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V NJM888F.V The WHITE column shows applicable Voltage Rank(s) Device Name V out Device Name V out NJM888KF-.V NJM888KF-.V NJM888KF-6.6V NJM888KF-6.6V NJM888KF-7.7V NJM888KF-7.7V NJM888KF-8.8V NJM888KF-8.8V NJM888KF-9.9V NJM888KF-9.9V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-6.6V NJM888KF-6.6V NJM888KF-7.7V NJM888KF-7.7V NJM888KF-8.8V NJM888KF-8.8V NJM888KF-9.9V NJM888KF-9.9V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V NJM888KF-.V - - Ver.-6-
3 ABSOLUTE MAXIMUM RATINGS (Ta= C) PARAMETER SYMBOL RATINGS UNIT Input Voltage + V Control Voltage V CONT + V Power Dissipation P D SOT-- (*) (*) ESON (*) 8(*) mw Operating Temperature Topr - +8 C Storage Temperature Tstg - + C (*): Mounted on glass epoxy board based on EIA/JEDEC. ( mm: Layers FR-) (*): Device itself. (*): Mounted on glass epoxy board based on EIA/JEDEC STANDARD. (...6mm: Layers FR-) (*): Mounted on glass epoxy board based on EIA/JEDEC STANDARD. (...6mm: Layers FR-, Internal foil area size: mm, Applying a thermal via hole to a board based on JEDEC standard JESD-) Operating voltage =+. +9V (In case of Vo<.V version) ELECTRICAL CHARACTERISTICS ( =Vo+V, C IN =.µf, Co=.µF: Vo.7V (Co=.µF :.8V<Vo.6V, Co=.7µF : Vo.8V), Ta= C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Output Voltage Vo Io=mA -.% +.% V Quiescent Current I Q Io=mA, Except I CONT 9 µa Quiescent Current at Control OFF I Q(OFF) V CONT =V na Output Current Io Vo -.V ma Line Regulation Vo/ =Vo+V Vo+6V (Vo V Version), =Vo+V 9V (Vo>V Version),. %/V Io=mA Load Regulation Vo/ Io Io= ma.9 %/ma Dropout Voltage (*) V I-O Io=mA..8 V Ripple Rejection RR ein=mvrms, f=khz, Io=mA, 7 db Average Temperature Coefficient of Output Voltage Vo/ Ta Vo=V Version Ta= 8 C, Io=mA ± ppm/ C Output Noise Voltage V NO f=hz 8kHz, Io=mA, Vo=V Version µvrms Control Current I CONT V CONT =.6V µa Control Voltage for ON-state V CONT(ON).6 V Control Voltage for OFF-state V CONT(OFF).6 V Input Voltage 9 V (*): The output voltage excludes under.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. Ver
4 TEST CIRCUIT A I IN.µF NJM888 *6.µF (Ceramic) I OUT V A I CONT CONTROL V V CONT GND *6:.8<Vo.6V version : Co=.µF (Ceramic) Vo.8V version : Co=.7µF (Ceramic) TYPICAL APPLICATION In the case where ON/OFF Control is not required:.µf NJM888 *7.µF R CONTROL GND *7:.8<Vo.6V version : Co=.µF Vo.8V version : Co=.7µF Connect control terminal to terminal - - Ver.-6-
5 In use of ON/OFF CONTROL:.µF NJM888 *7.µF R CONTROL GND *7:.8<Vo.6V version : Co=.µF Vo.8V version : Co=.7µF State of control terminal: H output is enabled. L or open output is disabled. Input Capacitance C IN Input Capacitance C IN is required to prevent oscillation and reduce power supply ripple for applications with high power supply impedance or a long power supply line. Use the C IN value of.µf greater to avoid the problem. C IN should connect between GND and as short as possible. In the case of using a resistance "R" between and control. The current flow into the control terminal while the IC is ON state (I CONT ) can be reduced when a pull up resistance "R" is inserted between and the control terminal. The minimum control voltage for ON state (V CONT (ON) ) is increased due to the voltage drop caused by I CONT and the resistance "R". The I CONT is temperature dependence as shown in the "Control Current vs. Temperature" characteristics. Therefore, the resistance "R" should be carefully selected to ensure the control voltage exceeds the V CONT (ON) over the required temperature range. Ver
6 POWER DISSIPATION vs. AMBIENT TEMPERATURE NJM888F Power Dissipation (Topr=-~+8 C,Tj= C) Power Dissipation P D (mw) On Board ( mm FR-) Device itself Ambient Temperature Ta( C) Ver.-6-
7 TYPICAL CHARACTERISTICS. Co=. µf(ceramic) Output Voltage vs. Input Voltage Output Voltage vs. Output Current. Output Voltage : Vo(V).9.8 Io=mA Io=mA Io=mA Output Voltage : Vo(V) VIN=.V Co=.µF(Ceramic) Input Voltage : VIN(V) 6 7 Output Current : Io(mA) Ground Pin Current vs. Output Current VIN=.V Co=.µ(Ceramic).. Dropout Voltage vs. Output Current Co=.µF(Ceramic) Ground Pin Current : IGND (ma) Dropout Voltage:dVI-O (V).... Output Current : IO(mA) Output Current:Io(mA) 6 Control Current vs. Control Voltage Output Voltage vs. Control Voltage VIN=.V Co=. µf(ceramic) Io=mA. VIN=.V Co=. µf(ceramic) Io=mA Control Current : I Cont (µa) Rc=kΩ Rc=kΩ Rc=Ω Output Voltage : Vo(V).. Rc=Ω Rc=kΩ. Rc=kΩ Control Voltage : V (V) Cont... Control Voltage : V (V) Cont Ver
8 TYPICAL CHARACTERISTICS Load Regulation vs. Output Current Peak Output Current vs. Input Voltage Load Regulation : dvo-io(mv) VIN=.V Co=. mf(ceramic) -6 Output Current : Io(mA) Peak Output Current : IoMAX(mA) 8 6 Co=.µF(Ceramic) Input Voltage : VIN(V) Quiescent Current vs. Input Voltage Output Noise Voltage vs. Output Current Quiescent Current : IQ (µa) Output is open. Co=.µF(Ceramic) Including Icont Output Noise Voltage : Vn(uVrms) 8 6 VIN=.V LPF:8kHz Co=.µF(Ceramic) 6 8 Input Voltage : VIN(V). u µ. µ µ. m m m m Output Current : Io(A) Ripple Rejection Ratio vs. Frequency Ripple Rejection Ratio vs. Output Current Ripple Rejection Ratio: RR (db) Io=mA VIN=.V ein=mvrms Co=.µF(Ceramic) Io=A Io=mA Io=mA Io=mA k k k Frequency : f (Hz) Ripple Rejection Ratio: RR (db) khz khz VIN=.V ein=mvrms Co=.µF(Ceramic) µ µ µ m m m m Output Current : Io(A) Ver.-6-
9 TYPICAL CHARACTERISTICS Equivalent Serise Resistance : ESR ( Ω ). Equivalent Serise Resistance vs. Output Current Co=.µF(Ceramic) STABLE REGION.. u. u u. m m m m Output Current : Io(A).. Dropout Voltage vs. Co=.µF(Ceramic) Control Voltage vs. Io=mA Co=.µF(Ceramic) Dropout Voltage : dv I-O (V)... Control Voltage :Vcont-off [V]... - Io=mA Co=.µF(Ceramic) Output Voltage vs. Temperature Output Peak Current vs. Temperature Output Voltage : Vo(V) Output Peak Current : Io_peak (ma) 8 Co=.µF(Ceramic) - Ver
10 TYPICAL CHARACTERISTICS Quiescent Current vs. Temperature.. Line Regulation vs. Io=mA Co=.µF(Ceramic) Quiescent Current : IQ (µa) Line Regulation : dvo/dio(%/v).. -. Output is open. Co=µF Load Regulation : dvo/dio(%/ma) Load Regulation vs. Io=-mA Co=. µf(ceramic) - Output Voltage : Vo(V).... Output Voltage vs. Io=mA Co=.µF(Ceramic) - Short Circuit Current v.s. VIN=.V Co=. µf(ceramic) Output is short to ground. Short Circuit Current : Isc (ma) - Ver
11 TYPICAL CHARACTERISTICS ON/OFF Transient Response Without Load ON/OFF Transient Response Output Voltage : Vo [V] Control Voltage Output Voltage VIN=.V Co=.µF(Ceramic) Io=mA Control Voltage : Vo [V] Output Voltage : Vo [V] Control Voltage Output Voltage VIN=.V Co=.µF(Ceramic) Io=mA Control Voltage : Vo [V] - - Time : t [S] Time : t [ms]..8 Load Transient Response Output Current VIN=.V Co=.µF(Ceramic)..8 Line Transient Response 6 Output Voltage : Vo [V] Output Voltage Output Current : Io [ma] Output Voltage : Vo [V] Input Voltage Output Voltage VIN=.V Co=.µF(Ceramic) lo=ma - Input Voltage : [V] Time : t [ µs] Time : t [ µs ] [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
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