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PDF NJM2309 Data sheet ( Hoja de datos )
| Número de pieza | NJM2309 | |
| Descripción | Switching Regulator Control IC | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJM2309
Switching Regulator Control IC for Step-Down
■GENERAL DESCRIPTION
The NJM2309 is a step-down Switching regulator IC with a
wide operating voltage range.
It features an open collector driver that can provide step-down
applications.
Internal soft-start function and timer latch function for short
circuit protection are included, requiring no external
components.
■PACKAGE OUTLINE
NJM2309M
( DMP8 )
NJM2309E
( SOP8 )
■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
: SOP8 JEDEC 150mil
: SSOP8
■BLOCK DIAGRAM
NJM2309V
( SSOP8 )
REF
8
VREF
U.V.LO
CT
7
30µA
OSC
CS
6
L.O
0.52V
ER⋅AMP
PW M
S.C.P
V+
5
PIN FUNCTION
1. IN -
2. F.B
3. GND
4. OUT
5. V +
6. CS
7. CT
8. REF
1234
IN-
F.B GND
OUT
Ver.2011-12-08
-1-
1 page  
NJM2309
■TYPICAL CHARACTERISTICS
L Level Output Voltage vs. Sink Current
(V+=6V, duty cycle=100%, Ta=25oC)
2
1.6
1.2
0.8
0.4
0
0 40 80 120 160 200
Sink Current ISINK (mA)
Oscillator Frequency vs. Timing Resistor
1000
(V+=6V, Ta=25oC)
CT=220pF
100
CT=470pF
CT=1,000pF
C =3,300pF
10 T
10
Timing Resistor RT (kΩ)
100
Reference Voltage vs. Operating Voltage
2.52
(IOR=1mA, Ta=25oC)
2.51
2.5
2.49
2.48
0
10 20 30
Operating Voltage V+ (V)
40
Duty Cycle vs. CS Pin Voltage
(V+=6V, F.B pin=1.2V, Ta=25oC)
100
80
60
40
20
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
CS Pin Voltage VTHCS (V)
Oscillator Frequency vs. Timing Capacitor
1000
(V+=6V, Ta=25oC)
100
RT=10kΩ
10 RT=33kΩ
RT=100kΩ
1
100
1000
10000
100000
Timing Capacitor CT (pF)
Operating Current vs. Operating Voltage
10 (Ta=25oC)
8 ICCAV
6
4
ICCLA
2
0
0 10 20 30 40
Operating Voltage V+ (V)
Ver.2011-12-08
-5-
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet NJM2309.PDF ] | |
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