NJM2309E [NJRC]
Switching Regulator, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO8, EMP-8;
| 型号： | NJM2309E |
| 厂家： | 
NEW JAPAN RADIO |
| 描述： | Switching Regulator, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO8, EMP-8 开关 光电二极管 |
| 文件： | 总7页 (文件大小：119K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NJM2309
Switching Regulator Control IC for Step-Down
■GENERAL DESCRIPTION
■PACKAGE OUTLINE
The NJM2309 is a step-down Switching regulator IC with a
wide operating voltage.
It features an open collector driver that can configure
step-down applications.
NJM2309M
NJM2309E
Internal soft-start function and timer latch function for short
circuit protection are included, requiring no external
components.
NJM2309V
■FEATURES
● PWM switching control
● Operating Voltage
3.6V to 32V
● Wide Oscillator Range 5kHz to 500 kHz
● Duty Cycle
0% to 100%
● Soft Start function
● Timer Latch for Short Circuit Protection
● Under Voltage Lockouts (U.V.LO)
● Bipolar Technology
● Package Outline
NJM2309M
NJM2309E
NJM2309V
: DMP8
: EMP8
: SSOP8
■BLOCK DIAGRAM
REF
8
CT
7
CS
6
V+
5
30 A
µ
PIN FUNCTION
1. IN-
VREF
OSC
2. F.B
L.O
U.V.LO
3. GND
4. OUT
5. V+
S.C.P
6. CS
ER AMP
⋅
0.52V
7. CT
PWM
8. REF
1
2
3
4
IN-
F.B
GND
OUT
Ver.2008-07-03
- 1 -
NJM2309
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
Input Voltage
Out pin Voltage
Reference Output Current
Output Current
SYMBOL
MAXIMUM RATINGS
UNIT
V
V
mA
mA
V+
VO_PIN
IOR
36
36
10
IO
200
DMP8
EMP8
: 375
: 375
Power Dissipation
PD
mW
SSOP8 : 312
Operating Temperature Range
Storage Temperature Range
Topr
Tstg
-40 ~ +85
-50 ~ 150
°C
°C
■RECOMMENDED OPERATING CONDITIONS (V+=6V, Ta=25°C)
PARAMETER
Operating Voltage
OUT pin Voltage
Feed Back Resistor
Oscillator Timing Capacitor
Oscillator Timing Resistor
Oscillation Frequency
SYMBOL
MIN.
3.6
–
100
220
10
MAX.
32
32
–
22,000
100
500
UNIT
V
V
kΩ
pF
kΩ
kHz
V+
VO_PIN
RNF
CT
RT
fOSC
5
■ELECTRICAL CHARACTERISTICS (V+=6V, RT=33kΩ, CT=1,000pF, Ta=25°C)
REFERENCE VOLTAGE BLOCK
PARAMETER
Output Voltage
SYMBOL
RATINGS
MIN.
TYP.
MAX.
UNIT
VREF
LINE
IOR=1mA
2.45
–
2.50
6.8
5
2.55
20.7
30
V
Line Regulation
Load Regulation
V+=3.6V ~ 32V, IOR=1mA
mV
mV
LOAD
–
IOR=0.1mA ~ 5.0mA
OSCILLATOR BLOCK
PARAMETER
SYMBOL
fosc
RATINGS
MIN.
85
TYP.
105
MAX.
125
UNIT
kHz
Oscillation Frequency
Oscillate Fluctuations1
(Line Fluctuations)
Oscillate Fluctuations2
(Temp Fluctuations)
CT=1,000pF, RT=33kΩ
fdv
fdt
V+=3.6V to 32V
–
–
1
5
–
–
%
%
Ta=-40°C to +85°C
ERROR AMPLIFIER BLOCK
PARAMETER
SYMBOL
RATINGS
MIN.
TYP.
MAX.
UNIT
Reference Voltage
Input Bias Current
Open Loop Gain
VB
IB
0.51
–
0.52
5
0.53
100
–
V
nA
dB
MHz
V
AV
–
90
0.6
–
Gain Band width Product
GB
–
–
VOM+
VOM-
V
REF-0.2
–
RNF=100kΩ
RNF=100kΩ
Maximum Output Voltage
(F.B Pin)
Output Source Current
(F.B Pin)
–
–
200
mV
IOM+
VOM=1V
40
85
200
µA
Ver.2008-07-03
- 2 -
NJM2309
■ELECTRICAL CHARACTERISTICS (V+=6V, RT=33kΩ, CT=1,000pF, Ta=25°C)
PWM COMPARATE BLOCK
PARAMETER
SYMBOL
VTH0
RATINGS
duty·cycle=0%*
MIN.
–
TYP.
0.40
MAX.
0.50
UNIT
V
Input Threshold Voltage
(F.B Pin)
Input Threshold Voltage
(F.B Pin)
VTH100 duty·cycle=100%*
–
0.85
–
V
SOFT START CIRCUIT BLOCK
PARAMETER
SYMBOL
IBCS
RATINGS
MIN.
–
TYP.
250
MAX.
650
UNIT
nA
Input Bias Current (CS Pin)
Input Threshold Voltage
(CS Pin)
Input Threshold Voltage
(CS Pin)
VTHCS0 duty·cycle=0%*
–
–
0.25
0.7
0.35
–
V
V
VTHCS100 duty·cycle=100%*
SHORT CIRCUIT PROTECTION BLOCK
PARAMETER
SYMBOL
RATINGS
MIN.
TYP.
MAX.
UNIT
Input Threshold Voltage
VTHPC
ICHG
1.20
10
1.50
30
1.80
50
V
µA
V
(F.B Pin)
Charge Current
(CS Pin)
CS Pin=0V, F.B Pin=2V
Latch mode Threshold Voltage
(CS Pin)
VTHLA
1.20
1.50
1.80
UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER
SYMBOL
RATINGS
MIN.
TYP.
MAX.
UNIT
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
VTHON
VTHOFF
VHYS
–
–
2.70
2.52
180
–
–
–
V
V
60
mV
OUTPUT BLOCK
PARAMETER
SYMBOL
VOL
RATINGS
MIN.
–
TYP.
0.35
MAX.
0.75
UNIT
V
L Level Output Voltage
Output Sink Current =70mA
(OUT Pin)
IO_LEAK V+=32V, VO_PIN=32V
–
–
1
Leak Current
µA
GENERAL CHARACTERISTICS
PARAMETER
SYMBOL
RATINGS
Latch Mode
RL= ∞, duty·cycle=50%
MIN.
TYP.
MAX.
UNIT
Quiescent Current
ICCLA
ICCAV
–
–
1.6
5.5
2.2
10
mA
mA
Average Quiescent Current
(*)
Duty·Cycle is defined as follows:
Duty·Cycle=0%: IC output transistor is OFF.
Duty·Cycle=100%: IC output transistor is ON.
Ver.2008-07-03
- 3 -
NJM2309
■ TYPICALAPPLICATIONS
V+
Q1
L
VOUT
Rsf
RT
Rsr
Cs
Rbe
CT
Rbc
R2
8
7
6
5
30uA
VREF
OSC
L.O
D1
COUT
U.V.LO
CIN
S.C.P
ER⋅AMP
0.52V
PWM
R1
1
2
3
4
RNF
CNF
GND
GND
Ver.2008-07-03
- 4 -
NJM2309
■TYPICAL CHARACTERISTICS
L Level Output Voltage vs. Sink Current
Duty Cycle vs. CS Pin Voltage
o
(V+=6V, duty cycle=100%, Ta=25C)
o
(V+=6V, F.B pin=1.2V, Ta=25C)
2
1.6
1.2
0.8
0.4
0
100
80
60
40
20
0
0
40
80
120
160
(mA)
200
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Sink Current I
CS Pin Voltage V
(V)
SINK
THCS
Oscillator Frequency vs. Timing Resistor
(V+=6V, Ta=25oC)
Oscillator Frequency vs. Timing Capacitor
(V+=6V, Ta=25oC)
1000
1000
CT=220pF
100
10
1
RT=10kΩ
RT=33kΩ
RT=100kΩ
100
10
CT=470pF
CT=1,000pF
CT=3,300pF
100
1000
10000
100000
10
100
Timing Resistor R (kΩ)
Timing Capacitor C (pF)
T
T
Reference Voltage vs. Operating Voltage
(IOR=1mA, Ta=25oC)
Operating Current vs. Operating Voltage
(Ta=25oC)
2.52
10
8
ICCAV
2.51
2.5
6
4
ICCLA
2.49
2.48
2
0
0
10
20
30
40
0
10
20
30
+
40
+
Operating Voltage V (V)
Operating Voltage V (V)
Ver.2008-07-03
- 5 -
NJM2309
■TYPICAL CHARACTERISTICS
Error Amplifier Block
L Level Output Voltage vs. Temperature
(V+=6V, ISINK=70mA)
Voltage Gain, Phase vs. Frequency
(V+=6V, Gain=40dB, Ta=25oC)
60
45
30
15
0
180
135
90
45
0
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Phase
Gain
0.1
1
10
100
1000
-50 -25
0
25 50 75 100 125 150
o
Frequency f (kHz)
Ambient Temperature Ta (C)
Oscillator Frequency vs. Temperature
Referece Voltage vs. Temperature
(V+=6V, IOR=1mA)
(V+=6V, RT=33kΩ, CT=1,000pF)
125
120
115
110
105
100
95
2.56
2.54
2.52
2.5
2.48
2.46
2.44
90
85
-50 -25
0
25 50 75 100 125 150
-50 -25
0
25 50 75 100 125 150
o
o
Ambient Temperature Ta (C)
Ambient Temperature Ta (C)
Average Quiescent Current vs. Temperature
Quiescent Current vs. Temperature
+
(Latch Mode, V+=6V, RT=33kΩ, CT=1,000pF)
2
∞
(V =6V, R =
10L
, duty cycle=50%, R=33kΩ, CT=1,000pF)
T
8
6
4
2
0
1.8
1.6
1.4
1.2
1
-50 -25
0
25 50 75 100 125 150
-50 -25
0
25 50 75 100 125 150
o
o
Ambient Temperature Ta (C)
Ambient Temperature Ta (C)
Ver.2008-07-03
- 6 -
NJM2309
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.2008-07-03
- 7 -
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