JRC NJM2898 User Manual

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NJM2898

2ch ULTRA LOW NOISE LOW DROPOUT VOLTA GE REGULAT OR

 GENERAL DESCRI PTION  PACKAGE OUTLINE

The NJM2898 is a 2ch ultra low noise low dropout voltage regulator

designed for VCO Applications.

Advanced Bipolar technology achieves low noise, high ripple

rejection and low quiescent current.

NJM2898PB1

 FEATURES

 High Ripple Rejection 75dB typ. (f=1kHz,Vo=3V V ersion)
 Output Noise V oltage Vno=19µVrms typ. (Cp=0.01µF , Co=1.0µF(Cer amic))

Vno=12µV rms ty p. (Cp =0.1µF, Co=10µF(Tantalum))

 Output capacitor with 1.0uF ceramic capacitor
 Output Current Io(max.)=100mA × 2ch
 High Precision Output Vo±1.0%
 Low Dropout V oltage 0.10V typ. (Io=60mA)
 ON/OFF Control (Active High)
 Internal Short Circuit Current Limit
 Internal Thermal Overload Protection
 Bipolar Technology
 Package Outline FFP12-B1 (2.0×2.0×0.85mm)

 PIN CONFIG URA TION

789

789

789

10

10

10
11

11

11
12

12

12

6

6

6

6

6

6

5

5

5

5

5

5

4

4

4

4

4

4

23

23

23

1

1

1

TOP　

TOP　

NJM2898PB1

8

8

8

7

7

7

321

321

321

　　　UNDER

　　　UNDER

9

9

9

10

10

10
11

11

11
12

12

12

PIN FUNCTION

1. V

2. V

3. GND 9. V

2 7. CONTROL1

OUT

2 8. V

OUT

OUT
OUT

1
1

4. CONTROL2 10. NOISE BYP ASS1

5. V

2 11. NC

IN

6. V

1 12. NOISE BYP ASS2

IN

 EQUIVALENT CIRCUIT

Ver.2004-12-22

V

1/VIN2

IN

Control1/

Control2

GND

Bandgap

Refer ence

Thermal

Protection

V

1/V

OUT

2

OUT

Noise B ypas s1/

Noise By pas s2

-1-

NJM2898

 ABSOLUTE MAXIMUM RATINGS (Ta=25°C)

PARAMETER SYMBOL RATINGS UNIT

Input Volt age VIN +14 V
Control Volt age V
Power Dissipation PD 350(*2) mW
Operati ng T e mperatur e
Storage Temperature

(*1): When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage.
(*2): Mounted on glass epoxy board based on EIA/JEDEC. (114.3x76.2x1.6mm: 2Layers)

 ELECTRICAL CHARA CTERISTICS
(1CH/2CH: V

=Vo+ 1V , CIN=0.1µF, Co=1.0uF: Vo≥2.7V (Co=2.2uF: Vo≤2.6V), Cp=0.01µF, Ta=25°C)

IN

PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Output Volt age Vo Io=30mA -1.0%
Quiesc ent Cur rent IQ Io=0mA, except Icont, per 1ch

Quiesc ent Cur rent
at Contr ol OF F

I

Output Cu rrent Io
Line Regulation
Load Regulation
Dropout Voltage

∆Vo/∆V

∆Vo/∆Io Io=0 ∼ 100mA

∆V

Ripple Rejection RR
Average T emperature

Coefficient of Output

∆Vo/∆Ta Ta=0 ∼ 85°C, Io=10mA

Volt age
Output Noise Volt age1 V

Output Noise Volt age2 V
Control Volt age for

ON-state
Control Volt age for
OFF-st at e

V

CONT(ON)

V

CONT(OFF)

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.

 OUTPUT VOL TAGE RANK LIST

Device Name

CH1 CH2

NJM2898PB1-2828 2.8V 2.8V

NJM2898PB1-JJ 2.85V 2.85V
NJM2898PB1-0303 3.0V 3.0V
NJM2898PB1-0521 5.0V 2.1V

+14(*1) V

CONT

Topr
Tstg

Q(OFF)

V

-40 ∼ +85 °C

-40 ∼ +125 °C

=0V , per 1ch

CONT

Vo−0.3V

VIN=Vo+1V ∼ V o+6V, Io=30mA

IN

Io=60mA

I−O

ein=200mVrms,f=1kHz, Io=10mA,
Vo=3V Version

NO1

NO2

Co=1.0µF(Ceramic), Vo=3V Version
f=10Hz ∼ 80kHz, Io=10mA, Cp=0.1µF,
Co=10µF(Tantalum), Vo=3V V ersion

f=10Hz ∼ 80kHz, Io=10mA, Cp=0.01µF,

1.6

V

OUT

+1.0% V

−

−

− −

120 180

100 nA

100 130 - mA

− −

− −

−

−

−

−

0.10 0.18 V
75

± 50

19

0.10 %/V

0.03 %/mA

−

−

−

12

− −

− −

0.6 V

µA

dB

ppm/°C

µVrms

µVrms

V

- 2 -

Ver.2004-12-22

A

V

A

A

A V V

V

 TEST CIRCUIT

V

OUT

1

I

OUT

NJM2898

*note1

1.0µF

1

V

OUT

1

V

OUT

1

CONTROL1

I

CONT

1

V

CONT

1

NOISE
BYPASS1

Cp=0.01µF

Cp=0.01µF

V

OUT

2

I

OUT

2

*3 Vo≤2.6V version: Co=2.2µF(ceramic)

1.0µF
(ceramic)

NC

NOISE
BYPASS2

*3

NJM2898

VIN1

V

0.1µF

IN

2

0.1µF

IN

1

I

VIN1

I

IN

2

VIN2

CONTROL2

V

OUT

2

V

OUT

2

GND

I

CONT

2

V

CONT

2

Ver.2004-12-22

-3-