NJM2384
DC/DC CONVERTER CONTROL IC
WITH CURRENT SENSE AMPLIFIER
■GENERAL
DESCRIPTION
The
NJM2384
is a low voltage operation DC/DC converter
control IC featuring high side current protection and soft start
functions.
It is suitable for battery charger, power module application
and on-board regulators.
NJM2384D
NJM2384M
■PACKAGE
OUTLINE
■FEATURES
●
PWM switching control
●
Operating Voltage
3.6V to 32V
●
Wide Oscillator Range
5kHz to 500 kHz
●
Current Sensing Amplifier
●
Soft-Start Function
●
UVLO (Under Voltage Lockouts)
●
Bipolar Technology
●
Package Outline
DIP14, DMP14, SSOP10
NJM2384V
■PIN
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.IN
+
6.OUT
7.NC
14.NC
NJM2384D
NJM2384M
1
2
3
4
5
10
9
8
7
6
NJM2384V
PIN FUNCTION
6. V
+
1.IN
-
1
2.IN
-
2
7.CS
8.CT
3.F.B
9.REF
4.GND
10.IN
+
5.OUT
Ver 1.1
- 1 -
NJM2384
■BLOCK
DIAGRAM
NC
14
IN
+
REF
12
CT
11
CS
10
V
+
NC
8
13
9
V
REF
CURRENT
SENSE AMP
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)
IN
+
REF
9
CT
8
CS
7
V
+
10
6
V
REF
CURRENT
SENSE AMP
OSC
L.O
U.V.LO
0.52V
ER·AMP
PWM
1
IN 1
-
2
IN 2
-
3
F.B
4
GND
5
OUT
(Package: SSOP10)
-2-
NJM2384
■ABSOLUTE
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
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
(DIP 14)
700
(DMP 14)
300
(SSOP 10)
250
-40
∼
+85
-50
∼
+150
UNIT
V
mA
mA
V
V
mW
°C
°C
■ELECTRICAL
CHARACTERISTICS (V
+
=6V,R
T
=33kΩ,C
T
=1000pF,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°C
∼
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
5
90
0.6
0
∼
V
REF
-0.8
–
85
MAX.
7
50
100
–
–
–
1
200
UNIT
mV
nA
nA
dB
MHz
V
V
µA
R
NF
=100kΩ
V
OM
=0.5V
–
40
-3-
NJM2384
■ELECTRICAL
CHARACTERISTICS (V
+
=6V,R
T
=33kΩ,C
T
=1000pF,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
GENERAL CHARACTERISTICS
PARAMETER
SYMBOL
Latch Mode
Threshold Voltage (CS Pin)
Quiescent Current
Average Quiescent Current
V
THLA
I
CCLA
I
CCAV
TEST CONDITION
MIN.
1.2
TYP.
1.5
1.6
5.5
MAX.
1.8
2.2
10
UNIT
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.
-4-
NJM2384
■
TYPICAL APPLICATIONS
330kΩ
36kΩ
2.50V
10
9
8
7
6
4.7uF
1000pF
180kΩ
Vin
Vout
V
REF
CURRENT
SENSE AMP
OSC
L.O
U.V.LO
ER·AMP
0.52V
PWM
GND
1
2
3
4
5
(Package:SSOP10)
-5-
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