Control IC. NJM2309 Datasheet

NJM2309 IC. Datasheet pdf. Equivalent

NJM2309 Datasheet
Recommendation NJM2309 Datasheet
Part NJM2309
Description Switching Regulator Control IC
Feature NJM2309; NJM2309 Switching Regulator Control IC for Step-Down ■GENERAL DESCRIPTION The NJM2309 is a step-do.
Manufacture New Japan Radio
Datasheet
Download NJM2309 Datasheet




New Japan Radio NJM2309
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
ERAMP
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-



New Japan Radio NJM2309
NJM2309
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
Out pin Voltage
Reference Output Current
Output Current
SYMBOL
V+
VO_PIN
IOR
IO
Power Dissipation
PD
Operating Temperature Range
Storage Temperature Range
Topr
Tstg
(Ta=25°C)
MAXIMUM RATINGS
UNIT
36
36
10
200
DMP8 : 375
SOP8 : 375
SSOP8 : 312
V
V
mA
mA
mW
-40 ~ +85
-50 ~ 150
°C
°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Operating Voltage
SYMBOL
V+
OUT pin Voltage
Feed Back Resistor
Oscillator Timing Capacitor
Oscillator Timing Resistor
Oscillation Frequency
VO_PIN
RNF
CT
RT
fOSC
MIN.
3.6
100
220
10
5
(V+=6V, Ta=25°C)
MAX.
UNIT
32 V
32 V
22,000
k
pF
100 k
500 kHz
ELECTRICAL CHARACTERISTICS
(V+=6V, RT=33k, CT=1,000pF, Ta=25°C)
REFERENCE VOLTAGE BLOCK
PARAMETER
SYMBOL
RATINGS
Output Voltage
Line Regulation
Load Regulation
VREF
LINE
LOAD
IOR=1mA
V+=3.6V ~ 32V, IOR=1mA
IOR=0.1mA ~ 5.0mA
MIN. TYP. MAX. UNIT
2.45 2.50 2.55 V
– 6.8 20.7 mV
– 5 30 mV
OSCILLATOR BLOCK
PARAMETER
SYMBOL
RATINGS
Oscillation Frequency
Oscillate Fluctuations1
(Line Fluctuations)
Oscillate Fluctuations2
(Temp Fluctuations)
fosc CT=1,000pF, RT=33k
fdv V+=3.6V to 32V
fdt Ta=-40°C to +85°C
MIN. TYP. MAX. UNIT
85 105 125 kHz
– 1 –%
– 5 –%
ERROR AMPLIFIER BLOCK
PARAMETER
Reference Voltage
Input Bias Current
Open Loop Gain
Gain Band width Product
Maximum Output Voltage
(F.B Pin)
Output Source Current
(F.B Pin)
SYMBOL
RATINGS
VB
IB
AV
GB
VOM+
VOM-
RNF=100k
RNF=100k
IOM+ VOM=1V
MIN.
0.51
VREF-0.2
40
TYP.
0.52
5
90
0.6
85
MAX.
0.53
100
200
200
UNIT
V
nA
dB
MHz
V
mV
µA
-2-
Ver.2011-12-08



New Japan Radio NJM2309
NJM2309
ELECTRICAL CHARACTERISTICS
PWM COMPARATE BLOCK
PARAMETER
Input Threshold Voltage
(F.B Pin)
Input Threshold Voltage
(F.B Pin)
SYMBOL
RATINGS
VTH0 duty·cycle=0%*
VTH100 duty·cycle=100%*
(V+=6V, RT=33k, CT=1,000pF, Ta=25°C)
MIN. TYP. MAX. UNIT
– 0.40 0.50 V
– 0.85 – V
SOFT START CIRCUIT BLOCK
PARAMETER
SYMBOL
RATINGS
Input Bias Current (CS Pin)
Input Threshold Voltage
(CS Pin)
Input Threshold Voltage
(CS Pin)
IBCS
VTHCS0 duty·cycle=0%*
VTHCS100 duty·cycle=100%*
MIN. TYP. MAX. UNIT
– 250 650 nA
– 0.25 0.35 V
– 0.7 – V
SHORT CIRCUIT PROTECTION BLOCK
PARAMETER
SYMBOL
RATINGS
Input Threshold Voltage
(F.B Pin)
Charge Current
(CS Pin)
Latch mode Threshold Voltage
(CS Pin)
VTHPC
ICHG
VTHLA
CS Pin=0V, F.B Pin=2V
MIN.
1.20
10
1.20
TYP. MAX. UNIT
1.50 1.80 V
30 50 µA
1.50 1.80 V
UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER
SYMBOL
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
VTHON
VTHOFF
VHYS
RATINGS
MIN.
60
TYP. MAX. UNIT
2.70 –
V
2.52 –
V
180 – mV
OUTPUT BLOCK
PARAMETER
SYMBOL
RATINGS
L Level Output Voltage
(OUT Pin)
Leak Current
VOL Output Sink Current =70mA
IO_LEAK V+=32V, VO_PIN=32V
MIN.
TYP. MAX. UNIT
0.35 0.75 V
– 1 µA
GENERAL CHARACTERISTICS
PARAMETER
SYMBOL
RATINGS
Quiescent Current
Average Quiescent Current
ICCLA
ICCAV
Latch Mode
RL= , duty·cycle=50%
(*) Duty·Cycle is defined as follows:
Duty·Cycle=0%: IC output transistor is OFF.
Duty·Cycle=100%: IC output transistor is ON.
MIN.
TYP. MAX. UNIT
1.6 2.2 mA
5.5 10 mA
Ver.2011-12-08
-3-







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