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NJM2891
2ch LOW DROPOUT VOLTAGE REGULATOR
s GENERAL DESCRIPTION The NJM2891 is low dropout voltage regulator designed for cellular phone application. Advanced Bipolar technology achieves low noise, high ripple rejection and low quiescent current. s FEATURES qHigh Ripple Rejection 70dB typ. (f=1kHz) qOutput Noise Voltage Vno=30Vrms (Cp=0.01F) qOutput capacitor with 1.0uF ceramic capacitor (Vo2.7V) qOutput Current Io(max.)=150mA x 2ch qHigh Precision Output Vo1.0% qLow Dropout Voltage 0.10V typ. (Io=60mA) qON/OFF Control (Active High) qInternal Short Circuit Current Limit qInternal Thermal Overload Protection qBipolar Technology qPackage Outline FFP12-B1 (2.0x2.0x0.85mm) s PIN CONFIGURATION
9 10 11 12 1 2 3 8 7 6 5 4
s PACKAGE OUTLINE
NJM2891PB1
PIN FUNCTION 1. VOUT2 2. VOUT2 3. GND 4. CONTROL2 5. VIN2 6. VIN1
7. CONTROL1 8. VOUT1 9. VOUT1 10. NOISE BYPASS1 11. NC 12. NOISE BYPASS2
NJM2891PB1 s EQUIVALENT CIRCUIT
VIN1/ VIN2 Cont1/Cont2
Thermal Protection
VOUT1/ VOUT2
Noise Bypass1 / Noise Bypass2
Bandgap Reference
GND
NJM2891
s ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Input Voltage VIN Control Voltage VCONT Power Dissipation PD Operating Temperature Topr Storage Temperature Tstg (Ta=25C) RATINGS UNIT +14 V +14(note 1) V 300(note 2) mW -40 +85 C -40 +125 C (note 1)When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage. (note 2)On board. s ELECTRICAL CHARACTERISTICS (Only 1CH/2CH : VIN=Vo+1V, CIN=0.1F, Co=1.0uF: Vo2.7V (Co=2.2uF: Vo2.6V), Cp=0.01F, Ta=25C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Output Voltage Vo Io=30mA -1.0% +1.0% V - Io=0mA, expect Icont Quiescent Current 120 180 IQ A - Quiescent Current VCONT=0V 100 nA IQ(OFF) - - at Control OFF Output Current Io 150 200 mA Vo-0.3V Line Regulation 0.10 %/V Vo/VIN VIN=Vo+1V Vo+6V, Io=30mA - - Load Regulation 0.03 %/mA Vo/Io Io=0 100mA - - Dropout Voltage Io=60mA 0.10 0.18 V VI-O - ein=200mVrms,f=1kHz, Io=10mA, Ripple Rejection RR 70 dB - - Vo=3V Version Average Temperature Vo/Ta Ta=085C, Io=10mA 50 - - ppm/C Coefficient of Output Voltage f=10Hz80kHz, Io=10mA, Output Noise Voltage VNO 30 Vrms - - Vo=3V Version Control Voltage for ON-state VCONT(ON) 1.6 V - - Control Voltage for OFF-state VCONT(OFF) 0.6 V - - (note 3)Please confirm the specification separately because some parameters depend on output voltage. s OUTPUT VOLTAGE RANK LIST Device Name CH1 NJM2891PB1-2121 2.1V NJM2891PB1-2725 2.7V NJM2891PB1-2727 2.7V NJM2891PB1-2825 2.8V NJM2891PB1-2828 2.8V NJM2891PB1-2929 2.9V NJM2891PB1-0328 3.0V NJM2891PB1-0303 3.0V NJM2891PB1-0521 5.0V
Vout CH2 2.1V 2.5V 2.7V 2.5V 2.8V 2.9V 2.8V 3.0V 2.1V
NJM2891
s TEST CIRCUIT
A V
VOUT1 1.0uF OR IOUT1 2.2uF(Vo2.6V)
I CONT1
V
VCONT1
VOUT1
VOUT1
CONTROL1
NOISE BYPASS1 Cp=0.01uF
VIN1
A
IIN1 0.1uF VIN1
NJM2891
NC VIN2 0.1uF NOISE BYPASS2 CONTROL2 Cp=0.01uF VOUT2 VOUT2 GND
A
IIN2 VIN2
A
I CONT2
V
VCONT2
V
VOUT2 IOUT2
1.0uF OR 2.2uF(Vo2.6V)
NJM2891
s TYPICAL APPLICATION x In the case where ON/OFF Control is not required:
VOUT1 1.0uF OR 2.2uF(Vo2.6V) R VOUT1 VOUT1 CONTROL1 (0300k) VIN1 VIN1
NOISE BYPASS1 Cp=0.01uF
0.1uF
NC
NJM2891
VIN2
VIN2
R NOISE BYPASS2 Cp=0.01uF VOUT2 VOUT2 1.0uF OR 2.2uF(Vo2.6V) VOUT2 GND (0300k) CONTROL2
0.1uF
Connect control terminal to VIN terminal. In case a resistance "R" is used, the quiescent current will be decreased. However, the but minimum operating voltage will be increase as well. Please refer to a figure of Output Voltage vs. Control Voltage.
NJM2891
y In use of ON/OFF CONTROL:
VOUT1 1.0uF OR 2.2uF(Vo2.6V) VOUT1 VOUT1 CONTROL1 R (0300k)
NOISE BYPASS1 Cp=0.01uF
VIN1
VIN1
0.1uF
NC
NJM2891
VIN2
VIN2
0.1uF NOISE BYPASS2 CONTROL2 Cp=0.01uF VOUT2 VOUT2 1.0uF OR 2.2uF(Vo2.6V) VOUT2 GND R (0300k)
In case the control terminal is "H", the output is enabled. The control terminal is "L" or "open", the output is disabled. Noise bypass Capacitance Cp
Noise bypass capacitance Cp reduces noise generated by band-gap reference circuit.
Noise level and ripple rejection will be improved when larger Cp is used. Please refer to the typical characteristics to determine the value.
Use of smaller Cp value may induce oscillation. Please make sure to use Cp value of greater than 0.01uF to avoid the problem.
NJM2891
s ELECTRICAL CHARACTERISTICS
NJM2891
s ELECTRICAL CHARACTERISTICS
NJM2891
s ELECTRICAL CHARACTERISTICS
NJM2891
[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.

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