NJM2384
Ver 1.2
-1-
DC/DC CONVERTER CONTROL IC
WITH CURRENT SENSE AMPLIFIER
■GENERAL DESCRIPTION ■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
■PIN CONFIGURATION
The NJM2384 is a low voltage operation DC/DC converte
r
control IC featuring high side current protection and soft star
t
functions.
It is suitable for battery charger, power module application
and on-board regulators.
NJM2384D
NJM2384V
NJM2384M
NJM2384D
NJM2384M
1.NC
2.IN
-
1
3.IN
-
2
4.F.B
5.GND
6.OUT
7.NC
8.NC
9. V
+
10.CS
11.CT
12.REF
13.IN
+
14.NC
PIN FUNCTION
1
4
3
2
14
11
12
13
5
6
7 8
9
10
1.IN
-
1
2.IN
-
2
3.F.B
4.GND
5.OUT
6. V
+
7.CS
8.CT
9.REF
10.IN
+
PIN FUNCTION
1
4
3
2
5 6
7
8
9
10
NJM2384V
NJM2384
- 2 -
■BLOCK DIAGRAM
1
V
REF
CURRENT
SENSE AMP
ER·AMP
L.O
U.V.LO
OSC
PWM
12 11 10 9
543 2
13
0.52V
14
6 7
8
V
+
CSCTIN
+
REF NCNC
IN
-
1 IN
-
2 OUT GND F. B NCNC
(Package: DIP14, DMP14)
1
V
REF
CURRENT
SENSE AMP
ER·AMP
L.O
U.V.LO
OSC
PWM
9 8 7 6
5 432
10
0.52V
V
+
CSCTIN
+
REF
IN
-
1 IN
-
2 OUT GND F. B
(Package: SSOP10)
NJM2384
-
3
-
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Input Voltage V
+
36 V
Reference Output Current I
OR
10 mA
Output Sink Current I
SINK
200 mA
Differential Input Voltage V
ID
2.5 V
Common Mode Input Voltage V
IC
-0.3 ∼ 2.5 V
Power Dissipation
P
D
(DIP 14) 700
(DMP 14) 300
(SSOP 10) 250
mW
Operating Temperature Range T
OPR
-40 ∼ +85 °C
Storage Temperature Range T
STG
-50 ∼ +150 °C
■ELECTRICAL CHARACTERISTICS (V
+
=6V,R
T
=33kΩ,C
T
=1000pF,Ta=25°C)
REFERENCE VOLTAGE BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Output Voltage V
REF
I
OR
=1mA 2.45 2.50 2.55 V
Line Regulation L
INE
V
+
=3.6 ∼ 32V, I
OR
=1mA – 6.8 20.7 mV
Load Regulation L
OAD
I
OR
=0.1 ∼ 5.0mA – 5 30 mV
OSCILLATOR BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Oscillation Frequency f
OSC
R
T
=33kΩ, C
T
=1000pF 85 105 125 kHz
Oscillate Fluctuations1
(Line Fluctuations)
f
dV
V
+
=3.6 ∼ 32V – 1 – %
Oscillate Fluctuations2
(Temp Fluctuations)
f
dT
Ta=-40°C ∼ 85°C – 5 – %
CURRENT SENSE AMPLIFIER BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Input Offset Voltage1 V
IO
1 – 2 7 mV
Input Offset Current1 I
IO
1 – 5 50 nA
Input Bias Current1 I
B
1 – 5 100 nA
Open Loop Gain1 A
V
1 – 90 – dB
Gain Bandwidth Product1 G
B
1 – 0.6 – MHz
Input Common Mode
Voltage Ratio1
V
ICM
1 – 0 ∼
V
REF
-0.8
– V
Maximum Output Voltage1
(F.B Pin)
V
OM-
1 R
NF
=100kΩ – – 1 V
Maximum Source Current1
(F.B Pin)
I
OM+
1 V
OM
=0.5V 40 85 200 µA
NJM2384
- 4 -
■ELECTRICAL CHARACTERISTICS (V
+
=6V,R
T
=33kΩ,C
T
=1000pF,Ta=25°C)
ERROR AMPLIFIER BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Reference Voltage2 V
B
2 0.51 0.52 0.53 V
Input Bias Current2 I
B
2 – 5 100 nA
Open Loop Gain2 A
V
2 – 90 – dB
Gain Bandwidth Product2 G
B
2 – 0.6 – MHz
Maximum Output Voltage2
(F.B Pin)
V
OM-
2 R
NF
=100kΩ – – 1 V
Maximum Source Current2
(F.B Pin)
I
OM+
2 V
OM
=0.5V 40 85 200 µA
PWM COMPARATE BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Input Threshold Voltage
(F.B Pin)
V
TH0
duty·cycle=0%
(note)
– 1.65 1.75 V
Input Threshold Voltage
(F.B Pin)
V
TH100
duty·cycle=100%
(note)
– 2.10 – V
SOFT START CIRCUIT BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Input Bias Current
(CS Pin)
I
BCS
CS Pin=1.8V – 250 650 nA
Input Threshold Voltage
(CS Pin)
V
THCS0
duty·cycle=0%
(note)
– 0.25 0.35 V
Input Threshold Voltage
(CS Pin)
V
THCS50
duty·cycle=100%
(note)
– 0.7 – V
UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
ON Threshold Voltage V
THON
– 2.70 – V
OFF Threshold Voltage V
THOFF
– 2.52 – V
Hysteresis Voltage V
HYS
60 180 – mV
OUTPUT BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
L Output Voltage (OUT Pin) V
OL
Output Sink Current=100mA – 0.25 0.65 V
GENERAL CHARACTERISTICS
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Latch Mode
Threshold Voltage (CS Pin)
V
THLA
1.2 1.5 1.8 V
Quiescent Current I
CCLA
Latch Mode – 1.6 2.2 mA
Average Quiescent Current I
CCAV
RL= , duty·cycle=50% – 5.5 10 mA
(note) Duty·Cycle is defined as follows:
Duty·Cycle=0%: IC output transistor is OFF.
Duty·Cycle=100%: IC output transistor is ON.
NJM2384
-
5
-
■ TYPICAL APPLICATIONS
1
V
REF
CURRENT
SENSE AMP
ER·AMP
L.O
U.V.LO
OSC
PWM
9 8 7 6
54 3 2
10
0.52V
GND
2.50V
Vin
Vout
36kΩ
330kΩ180kΩ4.7uF
1000pF
(Package:SSOP10)
NJM2384
-
6
-
■TYPICAL CHARACTERISTICS
L Output Voltage vs. Source Current
(V
+
=6V,R
T
=33kΩ,C
T
=1000pF,Ta=25°C)
0
0.2
0.4
0.6
0.8
1
0 50 100 150 200 250
Source Current I
SOURCE
(mA)
L Output Voltage V
OL
(V)
Oscillator Frequency vs. Timing Resistor
(V
+
=6V,Ta=25°C)
1
10
100
1000
1 10 100 1000 10000
Timing Resistor R
T
(kΩ)
Oscillator Frequency f
OSC
(kHz)
C
T
=470pF
C
T
=1000pF
Oscillator Frequency vs. Timing Capacitor
(V
+
=6V,Ta=25°C)
1
10
100
1000
10 100 1000 10000 100000
Timing Capacitor C
T
(pF)
Oscillator Frequency f
OSC
(kHz)
RT=10kΩ
RT=100kΩ
RT=33kΩ
Reference Voltage vs. Operating Voltage
(V
+
=6V,Ta=25°C)
2.48
2.49
2.5
2.51
2.52
0 10203040
Operating Voltage V
+
(V)
Reference Voltage V
REF
(V)
Duty Cycle vs. CS Pin Voltage
(V
+
=6V,Ta=25°C)
0
20
40
60
80
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
CS Pin Voltage V
THCS
(V)
Duty Cycle α (%)
Operating Current vs. Operating Voltage
(Ta=25°C)
0
2
4
6
8
10
0 10203040
Operating Voltage V
+
(V)
Operating Current I
CC
(mA)
I
CCAV
I
CCLA
NJM2384
-7-
■TYPICAL CHARACTERISTICS
[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.
Oscillator Frequency vs. Temperature
(V
+
=6V,R
T
=33kΩ,C
T
=1000pF)
60
80
100
120
140
160
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Oscillator Frequency
f
OSC
(kHz)
Reference Voltage vs. Temperature
(V
+
=6V,I
OR
=1mA)
2
2.2
2.4
2.6
2.8
3
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Reference Voltage
V
REF
(V)
L Output Voltage vs. Temperature
(V
+
=6V,I
SINK
=100mA,R
T
=33kΩ,C
T
=1000pF)
0
0.1
0.2
0.3
0.4
0.5
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
L Output Voltage V
OL
(V)
Supply Current vs. Temperature
(V
+
=6V,R
T
=33kΩ,C
T
=1000pF)
0
2
4
6
8
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Supply Current I
CC
(mA)
I
CCAV
I
CCLA
