NJM2825F-TE1 [NJRC]
Precision Micropower Shunt Voltage Reference;
| 型号： | NJM2825F-TE1 |
| 厂家： | 
NEW JAPAN RADIO |
| 描述： | Precision Micropower Shunt Voltage Reference |
| 文件： | 总6页 (文件大小：136K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NJM2825
Precision Micropower Shunt Voltage Reference
■GENERAL DESCRIPTION
■PACKAGE OUTLINE
NJM2825
reference.
Reference voltage form bandgap circuit has guaranteed the high
accuracy of the ±0.5% with trimming. In addition the temperature drift of
10ppm/°C typ. was actualized by the temperature compensating circuit.
of the 0.7µA for low power technology.
NJM2825F
The Output capacitor is unnecessary by the phase compensating circuit
which is built in. Tolerates capacitive loads, it is easy to use for application.
It is suitable for data converters, instrumentation, and other applications
where precision reference is required.
■FEATURES
■PRODUCT VARIATION
● Precision Reference Voltage
● Low temperature coefficient
● Low Quiescent Current
1,200mV 0.5%
10ppm/°C typ.
0.7µA max.
NJM2825
0.5%, IMIN=0.7µA
● No Output Capacitor Required
● Tolerates Capacitive Loads
● Bipolar Technology
NJM2823
● Package Outline
NJM2825F : SOT-23-5 (MTP5)
0.4%, IMIN=60µA
■BLOCK DIAGRAM
■PIN CONFIGURATION
CATHODE
NC 1
ANODE 2
NC 3
5 CATHODE
4 FB
VREF
FB
NJM2825F
ANODE
Ver.2009-03-05
- 1 -
NJM2825
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
SYMBOL
MAXIMUM RATINGS
UNIT
Cathode Voltage
VKA
14
V
Cathode Current
IK
20
mA
mA
mW
°C
Cathode-Anode Reverse Current
Power Dissipation
-IK
10
PD
TOPR
TSTG
200
Operating Temperature Range
Storage Temperature Range
-40 ∼ +85
-40 ∼ +125
°C
■RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER
Cathode Voltage
Cathode Current
SYMBOL MIN.
TYP.
MAX.
13
12
UNIT
V
mA
VKA
IK
VREF
0.7µ
–
–
■ELECTRICAL CHARACTERISTICS (IK=0.8µA,Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Reference Voltage
VREF
VFB=VA
(*1)
(*1)
(*1)
(*1)
1194.0
1200.0 1206.0
mV
mV
mV
mV
–
–
–
0.2
0.7
3.4
0.7
2
10
VFB=VA, IMIN≤ IK≤ 200µA
VFB=VA, 200µA ≤ IK≤ 2mA
VFB=VA, 2mA≤ IK≤ 12mA
∆VREF
/
Load Regulation
∆IK
Reference Voltage
Change vs. Cathode
Voltage Change
∆VREF
/
VREF≤ VKA≤ 13V, IK=2µA
R1=120kΩ, R2=val (Note 1)
(*2)
–
-1
-2
mV/V
∆VKA
(*2)
(*2)
(*2)
(*1)
–
–
–
–
0.3
1
0.3
0.4
0.7
2
Minimum Operating
V
REF≤ VKA≤ 5V
µA
µA
nA
Ω
IMIN
Current
5V≤ VKA≤ 13V
Feedback Current
Dynamic Impedance
IFB
ZKA
1
R1=∞, R2=120kΩ
VFB=VA, IK=0.7µA∼12mA
1.1
■TEMPERATURE CHARACTERISTICS (IK=0.8µA, Ta= -40°C ∼ 85°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
mV
Reference Voltage
0.8
10
2.3
30
∆VREF_T VFB=VA
(*1)
(*1)
(*2)
–
1191.7
–
Change
(Note 2)
ppm/°C
Reference Voltage
VREF_T
IFB_T
VFB=VA
R1=∞, R2=120kΩ
1200.0 1208.3
mV
(Note 2)
Feedback Current
Change
0.4
–
nA
Note 1: VREF···Reference voltage includes error.
Note 2: Reference Voltage Change is defined as
∆VREF_T [mV] = < Reference Voltage Change [ppm/°C] > × <-40°C ∼ 25°C> × VREF
The maximum value of “Reference Voltage Change” is determined based on sampling evaluation from the 5 initial
production lots, and thus not tested in the production test. Therefore, these values are for the reference design
purpose only.
(*1): Test Circuit (Fig.1)
(*2): Test Circuit (Fig.2)
Ver.2009-03-05
- 2 -
NJM2825
■TEST CIRCUIT
Input
VKA
IK
Input
VKA
IK
VREF
FB
CATHODE
VREF
FB
CATHODE
R1
R2
ANODE
IFB
ANODE
Fig.1 VKA=VREF to test circuit
VFB=VA
Fig.2 VKA>VREF to test circuit
R2
R1
REF
V
KA = V
1+
+ IFB × R2
■TYPICAL CHARACTERISTICS
Reference Voltage vs. Temperature
Reference Voltage vs Cathode Current
(VFB=VA )
(IK=0.8µA, VFB=VA)
15
12
9
1206
1204
1202
1200
1198
1196
1194
Ta=-40oC
6
Ta=25oC
Ta=75oC
3
0
-50 -25
0
25 50 75 100 125
0.0001 0.001 0.01 0.1
1
10
(mA)
100
o
Cathode Current I
k
Ambient Temperature Ta ( C)
Reference Voltage vs. Cathode Voltage
Reference Voltage vs. Cathode Current
(VFB=VA, Ta=25oC)
(R1=120kΩ, R2=val, I =2µA, Ta=25oC)
K
1202
1400
1200
1000
800
1200
1198
1196
1194
1192
1190
1188
600
400
0
5
10
15
0
0.2
0.4
0.6
0.8
(µA)
1
Cathode Voltage VK (V)
Cathode Current I
k
Ver.2009-03-05
- 3 -
NJM2825
■TYPICAL CHARACTERISTICS
Feedback Current vs. Temperature
(R1=Open, R2=120k , IK=0.8 A)
Dynamic Impedance vs. Frequency
(VFB=VA, Ta=25oC)
Ω
µ
2
1.5
1
10
1
IK
=10µA
IK=0.8µA
Cout=0µF
Cout=0µF
0.1
0.01
0.001
0.0001
I
K
=0.8µA
Cout=0.047µF
0.5
0
I
K
=10µA
Cout=0.1µF
-50 -25
0
25 50 75 100 125
0.01
0.1
1
10
100
1000
o
Frequency f (kHz)
Ambient Temperature Ta (C)
Sefty Operating Boundary Condition
(VFB=VA, Ta=25oC)
1
0.8
0.6
0.4
0.2
0
Ceramic Capacitor
Stable Operation Region
Note) Oscillation might occur while operating within the range
of safety curve.
So that, it is necessary to make ample margins by
taking considerations of fluctuation of the device.
Unstable Operation Region
0.001
0.01
0.1
1
10
Output Capacitance Co (
µF)
Power Dissipation vs. Temperature
(MTP5=Itself, Tj=
125oC)
∼
250
200
150
100
50
0
0
25
50
75
100
Ambient Temperature Ta (oC)
Ver.2009-03-05
- 4 -
NJM2825
■Application Information
The NJM2825 creates a highly accurate reference voltage, enabling a low power consumption application circuit to be
configured.
In the basic application (Fig.1) of the shunt regulator, a voltage drop is created by resistor Rs connected between the
input voltage and the NJM2825, and the output voltage (cathode – anode voltage = VKA) is controlled to a constant
value. The voltage drop due to Rs is determined by the total of the output current and the cathode current.
The feedback to the output voltage is controlled by the FB terminal, and the cathode current changes so that the set
voltage is obtained.
VIN
RS
VOUT=VKA
As a result, Rs must conform to the following conditions.
*Minimum cathode current = 0.7 uA min
Conditions under which the input voltage is a minimum
and the output current is a maximum.
IK
R1
R2
VREF
CO
*Maximum cathode current = 12 mA max
Conditions under which the input voltage is a maximum
and the output current is a minimum.
IFB
The value of resistor Rs is obtained by means of the following formula.
Fig.1 basic application
V
− VOUT
IN
RS
=
[Ω]
IK + IOUT
The output voltage can be set using any desired value between VREF and 13 V.
The output voltage is set according to the ratio between the values of the two external resistors, however an error
occurs depending upon the feedback current. The error can be minimized by combining two external resistors with low
resistance values. The formula for calculating the output voltage setting is shown below.
R2
R1
VOUT
=
+1 × V
+ IFB ×R2
REF
As shown in the “reference voltage versus cathode voltage”
characteristics example, the reference voltage value has
negative characteristics. The reference voltage is corrected by
using ∆VREF/∆VKA stipulated by the electrical characteristics.
VKA (V)
1.20
1.50
1.80
2.50
3.30
5.00
R1 (k
Ω
)
R2 (k
Ω
)
Open
120
120
120
120
120
Short
30.6
60.8
131
212
∆VREF
∆VKA
∆VREF
=
× VOUT
382
Table.1 Examples of output voltage settings at the standard
Table 1 shows an example of combining constants in the case where R1 is assumed to be 120 kΩ.
The error in the output voltage also varies with the accuracy of the resistors. In order to realize a highly accurate
application, the relative accuracy can be improved by either using accurate resistors or combining integrated resistors.
The NJM2825 contains an optimized phase compensation circuit. Consequently, in the basic application a stable
reference voltage is generated without the use of an output capacitor. As is indicated in the “dynamic impedance
versus frequency” characteristics, the impedance increases in proportion to the frequency. If necessary, connect an
output capacitor to reduce the high frequency impedance. You can connect a ceramic capacitor to obtain high stability,
but in this case be sure to use the NJM2825 in the stable operation region while referring to the “stable operation
boundary conditions” characteristics example.
Ver.2009-03-05
- 5 -
NJM2825
MEMO
[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.2009-03-05
- 6 -
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