NJM2383
DC/DC CONVERTER CONTROL IC
WITH CURRENT SENSE AMPLIFIER
sGENERAL
DESCRIPTION
The
NJM2383
is a low voltage operation DC/DC converter
control IC featuring high side current protection, soft start
and standby functions.
It is suitable for power module application and on-board
regulators.
NJM2383D
NJM2383M
sPACKAGE
OUTLINE
sFEATURES
q
PWM switching control
q
Operating Voltage
(3.6 to 32V)
q
Wide Oscillator Range
(5 to 350 kHz)
q
ON/OFF Circuit
(High Active)
q
Current Sensing Amplifier
q
Soft-Start Function
q
UVLO(Under Voltage Lockouts)
q
Bipolar Technology
q
Package Outline
DIP14, DMP14, SSOP10
NJM2383V
sPIN
CONFIGURATION
1
2
3
4
5
6
7
14
13
12
11
10
9
8
PIN FUNCTION
8.NC
1.NC
-
9. V
+
2.IN 1
3.IN
-
2
10.CS
11.CT
4.F.B
12.REF
5.GND
13.ON/OFF
6.OUT
14.NC
7.NC
NJM2383D
NJM2383M
1
2
3
4
5
10
9
8
7
6
NJM2383V
PIN FUNCTION
6. V
+
1.IN
-
1
2.IN
-
2
7.CS
8.CT
3.F.B
9.REF
4.GND
10.ON/OFF
5.OUT
Ver 1.0
- 1 -
NJM2383
sBLOCK
DIAGRAM
NC
14
ON/OFF
13
REF
12
CT
11
CS
10
V
+
9
NC
8
ON/OFF
“High” Active
CURRENT
SENSE AMP
V
REF
OSC
L.O
U.V.LO
ER·AMP
0.52V
PWM
1
NC
2
IN
-
1
3
IN
-
2
4
F.B
5
GND
6
OUT
7
NC
(Package: DIP14, DMP14)
ON/OFF
10
REF
9
CT
8
CS
7
V
+
6
ON/OFF
“High” Active
CURRENT
SENSE AMP
V
REF
OSC
L.O
U.V.LO
ER·AMP
0.52V
PWM
1
IN
-
1
2
IN
-
2
3
F.B
4
GND
5
OUT
(Package: SSOP10)
-2-
NJM2383
sABSOLUTE
MAXIMUM RATINGS (Ta=25°C)
PARAMETER
SYMBOL
Input Voltage
V
+
Reference Output Current
I
OR
Output Sink Current
I
SINK
Differential Input Voltage
V
ID
Common Mode Input Voltage
V
IC
ON/OFF Control Voltage
V
ON/OFF
Power Dissipation
P
D
Operating Temperature Range
Storage Temperature Range
T
OPR
T
STG
MAXIMUM RATINGS
36
10
200
2.5
-0.3
∼
2.5
-0.3
∼
36 (note)
(DIP 14)
700
(DMP 14) 300
(SSOP 14) 250
-40
∼
+85
-50
∼
+125
UNIT
V
mA
mA
V
V
V
mW
°C
°C
(note) When the supply voltage is less than 36V, the absolute maximum input voltage is equal to the supply voltage.
sELECTRICAL
CHARACTERISTICS (V
+
=6V,R
T
=33kΩ,C
T
=1000pF,V
ON/OFF
=3V,Ta=25°C)
REFERENCE VOLTAGE BLOCK
PARAMETER
SYMBOL
Output Voltage
Line Regulation
Load Regulation
OSCILLATOR BLOCK
PARAMETER
Oscillation Frequency
Oscillate Fluctuations1
(Line Fluctuations)
Oscillate Fluctuations2
(Temp Fluctuations)
V
REF
L
INE
L
OAD
TEST CONDITION
I
OR
=1mA
V
+
=3.6
∼
32V, I
OR
=1mA
I
OR
=0.1
∼
5.0mA
MIN.
2.45
–
–
TYP.
2.50
6.8
5
MAX.
2.55
20.7
30
UNIT
V
mV
mV
SYMBOL
f
OSC
f
dV
f
dT
TEST CONDITION
R
T
=33kΩ, C
T
=1000pF
V
+
=3.6
∼
32V
Ta=-40
∼
85°C
MIN.
85
–
–
TYP.
105
1
5
MAX.
125
–
–
UNIT
kHz
%
%
CURRENT SENSE AMPLIFIER BLOCK
PARAMETER
SYMBOL
Input Offset Voltage1
Input Offset Current1
Input Bias Current1
Open Loop Gain1
Gain Bandwidth Product1
Input Common Mode
Voltage Ratio1
Maximum Output Voltage1
(F.B Pin)
Maximum Source Current1
(F.B Pin)
V
IO
1
I
IO
1
I
B
1
A
V
1
G
B
1
V
ICM
1
V
OM-
1
I
OM+
1
TEST CONDITION
MIN.
–
–
–
–
–
–
TYP.
2
5
20
90
0.6
0
∼
V
REF
-0.8
–
85
MAX.
7
–
100
–
–
–
1
200
UNIT
mV
nA
nA
dB
MHz
V
V
µA
R
NF
=100kΩ
V
OM
=0.5V
–
40
-3-
NJM2383
sELECTRICAL
CHARACTERISTICS (V
+
=6V,R
T
=33kΩ,C
T
=1000pF,V
ON/OFF
=3V,Ta=25°C)
ERROR AMPLIFIER BLOCK
PARAMETER
SYMBOL
Reference Voltage2
Input Bias Voltage2
Open Loop Gain2
Gain Bandwidth Product2
Maximum Output Voltage2
(F.B Pin)
Maximum Source Current2
(F.B Pin)
PWM COMPARATE BLOCK
PARAMETER
Input Threshold Voltage
(F.B Pin)
Input Threshold Voltage
(F.B Pin)
V
B
2
I
B
2
A
V
2
G
B
2
V
OM-
2
I
OM+
2
TEST CONDITION
MIN.
0.51
–
–
–
–
40
TYP.
0.52
5
90
0.6
–
85
MAX.
0.53
100
–
–
1
200
UNIT
V
nA
dB
MHz
V
µA
R
NF
=100kΩ
V
OM
=0.5V
SYMBOL
V
TH0
V
TH100
TEST CONDITION
duty·cycle=0%
(note)
duty·cycle=100%
(note)
MIN.
–
–
TYP.
1.65
2.10
MAX.
1.75
–
UNIT
V
V
SOFT START CIRCUIT BLOCK
PARAMETER
SYMBOL
Input Bias Current
(CS Pin)
Input Threshold Voltage
(CS Pin)
Input Threshold Voltage
(CS Pin)
I
BCS
V
THCS0
V
THCS50
TEST CONDITION
CS Pin=1.8V
duty·cycle=0%
(note)
duty·cycle=100%
(note)
MIN.
–
–
–
TYP.
250
0.25
0.7
MAX.
650
0.35
–
UNIT
nA
V
V
UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER
SYMBOL
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
OUTPUT BLOCK
PARAMETER
L Output Voltage (OUT Pin)
V
THON
V
THOFF
V
HYS
TEST CONDITION
MIN.
–
–
60
TYP.
2.70
2.52
180
MAX.
–
–
–
UNIT
V
V
mV
SYMBOL
V
OL
TEST CONDITION
Output Sink Current=100mA
MIN.
–
TYP.
0.25
MAX.
0.65
UNIT
V
-4-
NJM2383
sELECTRICAL
CHARACTERISTICS (V
+
=6V,R
T
=33kΩ,C
T
=1000pF,V
ON/OFF
=3V,Ta=25°C)
ON/OFF BLOCK
PARAMETER
OFF Threshold Voltage
(ON/OFF Pin)
ON Threshold Voltage
(ON/OFF Pin)
Input Bias Current
(ON/OFF Pin)
SYMBOL
V
OFF
V
ON
I
ON/OFF
TEST CONDITION
MIN.
–
1.1
TYP.
–
–
100
MAX.
0.3
–
120
UNIT
V
V
µA
V
ON/OFF
=3V
–
GENERAL CHARACTERISTICS
PARAMETER
SYMBOL
Stand-by Current
Latch Mode
Threshold Voltage (CS Pin)
Quiescent Current
Average Quiescent Current
I
CCSTBY
V
THLA
I
CCLA
I
CCAV
TEST CONDITION
Stand-by Mode, V
ON/OFF
=0V
MIN.
–
1.2
–
–
TYP.
12
1.5
1.6
5.5
MAX.
20
1.8
2.2
10
UNIT
µA
V
mA
mA
Latch Mode
RL=
, duty·cycle=50%
(note) Duty·Cycle is defined as follows:
Duty·Cycle=0%: IC output transistor is OFF.
Duty·Cycle=100%: IC output transistor is ON.
s
TYPICAL APPLICATIONS
V
330kΩ
ON/OFF
CONTROL
2.50V
36kΩ
1000pF
4.7µF
180kΩ
+
10
9
8
7
6
V
OUT
ON/OFF
“High” Active
CURRENT
SENSE AMP
V
REF
OSC
L.O
U.V.LO
ER·AMP
0.52V
PW M
GND
1
2
3
4
5
(Package:SSOP10)
-5-
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