NJM2828
- 1 - Ver.2016-05-10
Negative Output Low Drop Out voltage regulator GENERAL DESCRIPTION PACKAGE OUTLINE The NJM2828 is a negative output low dropout regulator. Advanced bipolar technology achieves low noise, high precision voltage and high ripple rejection. Adjustable soft-start function is useful for reducing inrush current and controlling power-on sequence. Moreover the discharge function, the shunt SW, makes effective sequence control with the soft-start function. 1.0 F Output capacitor and small package can make NJM2828 suitable for portable items.
FEATURES
Low Current Consumption 0.13V (typ.) @Io=60mA High Precision Output ±1.5% High Ripple Rejection 65dB(typ.) @f=1kHz, Vo=-7V Version Correspond to Low ESR capacitor with 1.0F ceramic capacitor. Output Current Io(max.)=100mA ON/OFF Control(Positive voltage control from 0 to +5V) Soft-start Function Shunt SW Function Thermal Shutdown Circuit Over Current Protection Bipolar Technology Package Outline SC88A
PIN CONFIGURATION
BLOCK DIAGRAM
NJM2828F3-XX
NJM2828F3
CurrentLimit
BandgapReference
OutputControl
ThermalProtection
GND
CS
CONTROL
VIN VOUT
GND 1 5 CS
4 CONTROL VIN 2
VOUT 3
NJM2828
- 2 - Ver.2016-05-10
OUTPUT VOLTAGE RANK LIST Device Name VOUT Device Name VOUT
NJM2828F3-14 -1.4V NJM2828F3-06 -6.0V NJM2828F3-15 -1.5V NJM2828F3-63 -6.3V NJM2828F3-02 -2.0V NJM2828F3-65 -6.5V NJM2828F3-22 -2.2V NJM2828F3-07 -7.0V NJM2828F3-03 -3.0V NJM2828F3-75 -7.5V NJM2828F3-04 -4.0V NJM2828F3-08 -8.0V NJM2828F3-05 -5.0V NJM2828F3-85 -8.5V NJM2828F3-51 -5.1V NJM2828F3-09 -9.0V NJM2828F3-55 -5.5V NJM2828F3-10 -10.0V
Output voltage options available : -1.5 ~ -10.0V (0.1V step)
ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL RATINGS UNIT
Input Voltage VIN -14 V Control Voltage VCONT +5 V Power Dissipation PD 250(*1) mW Operating Temperature Topr 40 +85 °C
Storage Temperature Tstg 40 +125 °C Output Sink Current at OFF-state ISINK(OFF) 10 mA
(*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm: based on EIA/JEDEC standard, 2Layers)
Operating voltage VIN=-3.2 -12V (In case of Vo>-3.0V version)
NJM2828
- 3 - Ver.2016-05-10
ELECTRICAL CHARACTERISTICS
(Vo<-2.2V Version: VIN=Vo-1V, VCONT=3V, CIN=0.1 F, Co=1.0 F, Ta=25 C) (Vo≥-2.2V Version: VIN=-3.2V, VCONT=3V, CIN=0.1 F, Co=2.2 F(Vo>-2.0V: Co=4.7 F), Ta=25 C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Output Voltage Vo Io=30mA +1.5% - -1.5% V Quiescent Current IQ Io=0mA, except Icont - 130 200 µA Quiescent Current at OFF-state IQ(OFF) VCONT=0V - - 100 nA
Output Current Io VO+0.3V 100 130 - mA Line Regulation Vo/ VIN VIN=Vo-1V -12V, Io=30mA - - 0.10 %/V Load Regulation Vo/ Io Io=0 60mA - - 0.03 %/mA Dropout Voltage(*2) VI_O Io=60mA - 0.13 0.23 V
Ripple Rejection RR ein=200mVrms, f=1kHz, Io=10mA Vo=-7V Version - 65 - dB
Average Temperature Coefficient of Output Voltage
Vo/ Ta Ta=0 85°C, Io=10mA - ±50 - ppm/°C
Output Noise Voltage1 VNO f=10Hz 80kHz, Io=10mA, Vo=-7V Version - 100 - µVrms
CS Terminal Charge Current Ics VCS=0V 4 5 6 µA Output Resistance at OFF-state RO(OFF) VCONT=0V, Vo=-7V Version - 360 - Ω
Control Current ICONT VCONT=1.6V - 2 4 µA Control Voltage for ON-state VCONT(ON) 1.6 - - V
Control Voltage for OFF-state VCONT(OFF) - - 0.6 V
Input Voltage VIN -12 - - V (*2):Excludes Vo>-3.0V version. 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.
TEST CIRCUIT
NJM2828
VIN
VIN VOUT
CONTROL
GND
0.1µF IQ
ICONT
VCONT
1.0µF*3
IOUT VOUT
V
V
A
0.047µF
CS
A
*3 -2.2V Vo< -2.0V version : Co=2.2 F(Ceramic) Vo -2.0V version : Co=4.7 F(Ceramic)
(Ceramic)
NJM2828
- 4 - Ver.2016-05-10
TYPICAL APPLICATIONS
ON/OFF control ON/OFF control can be controlled by positive logic voltage. When VCONT is “H”, the output becomes ON state, If VCONT is "L" or open (High Z), the output becomes OFF state. The relations between VCONT and the state is as follows:
VCONT +1.6V VCONT +5V ("H" level): ON state VCONT 0V VCONT +0.6V ("L" level): OFF state
VCONT +0.6V < VCONT < +1.6V ("L" level): Undefined If ON/OFF control is not used, keep applying positive VCONT to CONTROL pin to make the output constantly ON. Negative voltage should not use for VCONT .
NJM2828
VIN VOUT
CONTROL
GND
0.1µF
VOUT VIN
R CS
CONTROL CS
Cs=0.047µF
*4 -2.2V Vo< -2.0V version : Co=2.2 F Vo -2.0V version : Co=4.7 F
1.0µF*4
*In the case of using a resistor "R" to control line. If need to reduce the control current when the control voltage, insert a resistor to control pin. When insert the resistor “R”, should consider voltage drop by the resistor. Therefore the control voltage should set in
order to satisfy minimum VCONT(ON) with considering voltage drop. The VCONT(ON) and ICONT have temperature dependence as shown in "Control Current vs. Temperature" and " Control
Voltage vs. Temperature" characteristics. Therefore, the resistance "R" should be selected to consider the temperature characteristics.
NJM2828
- 5 - Ver.2016-05-10
*Input Capacitor CIN
The input capacitor CIN is required in order to prevent oscillation and reduce power supply ripple of applications when high power supply impedance or a long power supply line. Therefore, the recommended capacitance (refer to conditions of ELECTRIC CHARACTERISTIC) or larger input
capacitor, connected between VIN and GND as short path as possible, is recommended in order to avoid the problem. *Output Capacitor CO
The output capacitor CO is required for a phase compensation of the internal error amplifier, and the capacitance and the equivalent series resistance (ESR) influence stable operation of the regulator. If use a smaller output capacitor than the recommended capacitance (refer to conditions of ELECTRIC
CHARACTERISTIC), it may cause excess output noise or oscillation of the regulator due to lack of the phase compensation. Therefore, the recommended capacitance or larger output capacitor, connected between VOUT and GND as short path as possible, is recommended for stable operation. The recommended capacitance may be different by output voltage, therefore confirm the recommended capacitance of the required output voltage. Furthermore, a larger output capacitor reduces output noise and ripple output, and also improves Output
Transient Response when a load changes rapidly. Selecting the output capacitor, should consider varied characteristics of a capacitor: frequency characteristics,
temperature characteristics, DC bias characteristics and so on. Therefore, the capacitor that has a sufficient margin of the rated voltage against the output voltage and superior temperature characteristics, is recommended for CO.
NJM2828
- 6 - Ver.2016-05-10
*Soft-start function
The capacitor Cs, that is connected between CS pin and GND, controls the following: The rising time of output voltage. The inrush current at start-up.
When the soft start function is not used, CS pin should be open.
1. Cs capacitance vs rise time of output voltage The rise time of output voltage is calculated as follows: Δt (ms) 213 x Cs(μF)
0
50
100
150
200
250
0 0.2 0.4 0.6 0.8 1 1.2
Cs capacity vs risetime of output voltage
rise
time
of o
utpu
t vol
tage
: t (
mS)
Cs capacity : Cs( F)
@:Ta=25oC V IN=6V C IN=0.1 F Co=1 F(Ceramic) Io=0mA
2. Inrush current at start-up
The peak value of the inrush current can be limited according to the capacitance of the Cs. Inrush current wave :
Cs=0μF(Open) : IPEAK =150μA Cs=0.0047μF : IPEAK =20μA Peak current: 150mA at CS=0μF Peak current: 20mA at CS=0.0047μF This characteristic is one example. It is necessary to examine the characteristic with an actual circuit ٭
because there is an influence by the characteristic such as output voltage/output capacitor.
Vin=Vo-1V Cin=0.1μF(Ceramic) Co=1μF(Ceramic) Io=0mA
Vin=Vo-1V Cin=0.1μF(Ceramic) Co=1μF(Ceramic) Io=0mA
Inrush current Inrush current
Output Voltage Output Voltage Control ON Control ON
50mA/div
20mA/div
NJM2828
- 7 - Ver.2016-05-10
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2828F3 Power Dissipation(Topr=-40~+85℃,Tj=125℃)
0
100
200
300
400
500
-50 -25 0 25 50 75 100Ambient Temperature Ta(℃)
Pow
er D
issi
patio
n P D
(mW
)
On Board(114.3×76.2×1.6mm, FR-4)
NJM2828
- 8 - Ver.2016-05-10
ELECTRICAL CHARACTERISTICS
6.7
6.8
6.9
7
7.1
7.2
6.7 6.8 6.9 7 7.1 7.2 7.3 7.4 7.5
Out
put V
olta
ge :
Vo(V
)
Input Voltage : VIN(V)
NJM2828/-7.0VOutput Voltage vs. Input Voltage
@:Ta=25oC Co=1.0 F(Ceramic)
Io=0A
Io=30mA
Io=100mA
0
1
2
3
4
5
6
7
8
0 50 100 150 200
Out
put V
olta
ge :
Vo(V
)
NJM2828/-7.0VOutput Voltage vs. Output Current
@:Ta=25oC V IN=-8.0V Co=1.0 F(Ceramic)
Output Current : Io(mA)
0
2
4
6
8
10
0 20 40 60 80 100 120
Gro
und
Pin
Cur
rent
: IGN
D (m
A)
NJM2828/-7.0VGround Pin Current v.s. Output Current
@:Ta=25oC VIN=-8.0V Co=1.0 F(Ceramic)
Output Current : IO(mA)
0
0.05
0.1
0.15
0.2
0.25
0.3
0 20 40 60 80 100 120Output Current:Io(mA)
@:Ta=25oC Co=1.0 F(Ceramic) Vcont=3.0V
Dro
pout
Vol
tage
:dVI-
O (V
)NJM2828/-7.0V
Dropout Voltage vs. Output Current
0
5
10
15
20
25
30
0 1 2 3 4 5
Con
trol
Cur
rent
: I C
ont(
A)
Control Voltage : VCont
(V)
NJM2828/-7.0VControl Current vs. Control Voltage
@:Ta=25oC VIN=-8.0V Co=1.0 F(Ceramic) Io=30mA
Rc=0
Rc=50k
Rc=100k
0
1
2
3
4
5
6
7
8
0 0.5 1 1.5 2 2.5 3
Out
put V
olta
ge :
Vo(V
)
Control Voltage : VCont
(V)
NJM2828/-7.0VOutput Voltage vs. Control Voltage
@:Ta=25oC VIN=-8.0V Co=1.0 F(Ceramic) Io=30mA
Rc=0
Rc=50k
Rc=100k
NJM2828
- 9 - Ver.2016-05-10
ELECTRICAL CHARACTERISTICS
-60
-50
-40
-30
-20
-10
0
0 20 40 60 80 100 120
Load
Reg
ulat
ion
: dVo
/dIo
(mV)
Output Current : Io(mA)
NJM2828/-7.0VLoad Regulation vs. Output Current
@:Ta=25oC VIN=-8.0V Co=1.0 F(Ceramic)
0
50
100
150
200
8 9 10 11 12 13 14
Peak
Out
put C
urre
nt :
IoMA
X(m
A)
NJM2828/-7.0VPeak Output Current vs. Input Voltage
@:Ta=25oC Co=1.0 F(Ceramic) Vcont=3.0V
Input Voltage : VIN(V)
0
500
1000
1500
2000
0 2 4 6 8 10 12 14
Qui
esce
nt C
urre
nt :
IQ (
A)
NJM2828/-7.0VQuiescent Current v.s. Input Voltage
@:Ta=25oC Output is open. Co=1.0 F(Ceramic) Vcont=3.0V
Input Voltage : VIN(V)
0
20
40
60
80
100
120
Output Current : Io(mA)
Out
put N
oise
Vol
tage
: Vn
(Vr
ms)
NJM2828/-7.0VOutput Noise Voltage vs. Output Current
@:Ta=25oC VIN=-8.0V Co=1.0 F
0.001 0.01 0.1 1 10 100
LPF:80kFLAT
20
30
40
50
60
70
80
90
100
10 100 1000 104 105
Rip
ple
Rej
ectio
n R
atio
: R
R (d
B)
Frequency : f (Hz)
NJM2828/-7.0VRipple Rejection Ratio v.s. Frequency
Io=0mA
@:Ta=25oC VIN=-8.0V ein=200mVrms Co=1.0 F(Ceramic)
10 100 1k 10k 100k
Io=30mA
Io=100mA
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1 10 100Output Current : Io(mA)
Rip
ple
Rej
ectio
n : R
R (d
B)
NJM2828/-7.0VRipple Rejection vs. Output Current
f=1kHz
f=10kHz
@:Ta=25oC V IN=-8.0V ein=200mVrms Co=1.0 F(Ceramic)
NJM2828
- 10 - Ver.2016-05-10
ELECTRICAL CHARACTERISTICS
0.01
0.1
1
10
100
0.001 0.01 0.1 1 10 100Output Current : Io(mA)
@:Ta=25oC Co=1.0 F(Ceramic)
Equi
vale
nt S
eris
e R
esis
tanc
e : E
SR(
)
NJM2828/-7.0VEquivalent Serise Resistance vs. Output Current
STABLE REGION
0
0.05
0.1
0.15
0.2
0.25
0.3
-50 0 50 100 150Temperature : Ta (oC)
@:Io=60mA Co=1 F(Ceramic)
NJM2828/-7.0VDropout Voltage v.s. Temperature
Dro
pout
Vol
tage
:dVI
-O (V
)
0
0.5
1
1.5
2
-50 0 50 100 150
Con
trol
Vol
tage
: VC
ON
T(O
N) (
V)
Temperature : Ta (oC)
NJM2828/-7.0VControl Voltage v.s. Temperature
@:VIN=-8.0V Io=30mA Co=1.0 F(Ceramic)
6.8
6.9
7
7.1
7.2
-50 0 50 100 150
Out
put V
olta
ge V
o (V
)
Temperature Ta (oC)
NJM2828/-7.0VOutput Voltage v.s. Temperature
@:VIN=-8.0V Io=30mA Co=1.0 F(Ceramic)
0
2
4
6
8
10
-50 0 50 100 150
CS
Cha
rge
Cur
rent
: ICS
(A
)
Temperature : Ta (oC)
NJM2828/-7.0VCS Charge Current v.s. Temperature
@:VIN=-8.0V CS is short to ground. Co=1.0 F(Ceramic)
0
2
4
6
8
10
-50 0 50 100 150
NJM2828/-7.0VControl Current v.s. Temperature
Temperature : Ta ( oC)
@:VCONT=3.0V Co=1.0uF(Ceramic)
NJM2828
- 11 - Ver.2016-05-10
ELECTRICAL CHARACTERISTICS
0
50
100
150
200
250
-50 0 50 100 150
Qui
esce
nt C
urre
nt :
IQ (
A)
Temperature : Ta (oC)
NJM2828/-7.0VQuiescent Current v.s. Temperature
@:VIN=-8.0V Output is open. Co=1.0 F(Ceramic)
Iq+Icont
Iq
-0.1
-0.05
0
0.05
0.1
-50 0 50 100 150
Line
Reg
ulat
ion
: dVo
/dIo
(%/V
)
Temperature : Ta (oC)
NJM2828/-7.0VLine Regulation v.s. Temperature
@:dVIN=-8-12V Io=30mA Co=1.0 F(Ceramic)
0
0.005
0.01
0.015
0.02
0.025
0.03
-50 0 50 100 150
Load
Reg
ulat
ion
: dVo
/dIo
(%/m
A)
Temperature : Ta (oC)
NJM2828/-7.0VLoad Regulation v.s. Temperature
@:VIN=-8.0V Io=0-60mA Co=1.0 F(Ceramic)
0
2
4
6
8
-50 0 50 100 150 200
Out
put V
olta
ge V
o (V
)
Temperature Ta (oC)
NJM2828/-7.0VOutput Voltage v.s. Temperature
@:VIN=-8.0V Io=30mA Co=1.0 F(Ceramic)
0
50
100
150
200
-50 0 50 100 150
Shor
t Cir
cuit
Cur
rent
: ISC
(mA
)
Temperature : Ta (oC)
NJM2828/-7.0VShort Circuit Current v.s. Temperature
@:VIN=-8.0V Output is short to ground. Co=1.0 F(Ceramic)
NJM2828
- 12 - Ver.2016-05-10
ELECTRICAL CHARACTERISTICS
-7.04
-7.02
-7
-6.98
-6.96
-6.94
-6.92
-6.9
-6.88
-14
-13
-12
-11
-10
-9
-8
-7
-6
0 0.4 0.8 1.2 1.6 2
NJM2828_-7.0VLine Transient Response
Out
put V
olta
ge :
Vo [V
]
Time : t [mS]
Input Voltage
Output Voltage
@:Ta=25oC VDD=-8.0V Co=1.0 F(Ceramic) Io=30mA
Inpu
t Vol
tage
: V
IN [V
]
-7.06
-7.04
-7.02
-7
-6.98
-6.96
-6.94
-6.92
-6.9
-250
-200
-150
-100
-50
0
50
100
150
0 40 80 120 160 200
NJM2828_-7.0VLoad Transient Response
Out
put V
olta
ge :
Vo [V
]
Time : t [ S]
Output Current
Output Voltage
@:Ta=25oC VDD=-8.0V Co=1.0 F(Ceramic)
Out
put C
urre
nt :
Io [m
A]
-10
-8
-6
-4
-2
0
2
4
6
-12
-10
-8
-6
-4
-2
0
2
4
0 10 20 30 40 50
NJM2828_-7.0VON/OFF Transient Response without Load
Out
put V
olta
ge :
Vo [V
]
Con
trol
Vol
tage
: V
o [V
]
Time : t [ms]
Control Voltage
Output Voltage
@:Ta=25oC VDD=-8.0V Co=1.0 F(Ceramic) Cs=0.047 F Io=0mA
[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.