NJRC NJU7630 Pwm control step-down switching regulator ic Datasheet

NJU7630
PWM control Step-Down switching regulator IC
■GENERAL DESCRIPTION
■PACKAGE OUTLINE
NJU7630 is a high speed low voltage operation switching
regulator control IC. It features a totem pole driver that can directly
drive an external MOS-FET.
Internal soft-start function, Dead time control and timer latch
function are included, requiring no external components. All
parameters can be optimized by additional external components for
design flexibility.
■FEATURES
● PWM switching control
● Operating Voltage
2.2V to 8V
● Wide Oscillator Range 300kHz to 1MHz
● Maximum Duty Cycle
100% typ.
● Quiescent Current
800µA typ.
● Soft-Start Function
Internal : 16ms typ. or adjustable
● Dead Time Control
● Timer Latch for Short Circuit Protection
● C-MOS Technology
● Package Outline
NJU7630M : DMP8
NJU7630RB1 : TVSP8
NJU7630M
NJU7630RB1
■PRODUCT VARIATION
NJU7631*
NJU7632*
PWM/PFM
Light Load to
Efficiency
Standby Function
Step-up
NJU7630
NJU7600
PWM Control
* Under Development
■PIN CONFIGURATION
1
8
2
7
3
6
4
5
NJU7630M
NJU7630RB1
Ver.2005-03-01
PIN FUNCTION
1. OUT
2. V+
3. FB
4. IN5. SCP
6. DTC
7. RT
8. GND
-1-
NJU7630
■BLOCK DIAGRAM
V+
FB
0.8V
ER⋅AMP
IN1V
0.2V
Vref
Soft Start
UVLO
Latch
PWM
Buffer
2µA
SCP
OUT
SCP
OSC
2kΩ
0.5V
0.5
1V
RT
A
1V
DTC
RT
GND
RT
-2-
Ver.2005-03-01
NJU7630
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
SYMBOL
Supply Voltage
V+
Output Pin Current
IO
Power Dissipation
PD
Operating Temperature Range
Storage Temperature Range
TOPR
TSTG
MAXIMUM RATINGS
+9
±50
DMP8 :300
TVSP8 :320
-40 ~ +85
-40 ~ +125
■RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER
SYMBOL
MIN.
Operating Voltage
V+
2.2
Oscillator Timing Resistor
RT
30
Oscillation Frequency
fOSC
300
TYP.
–
47
700
UNIT
V
mA
mW
°C
°C
MAX.
8
120
1,000
UNIT
V
kΩ
kHz
■ELECTRICAL CHARACTERISTICS (V+=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER
Under Voltage Lockout Block
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
Soft Start Block
Soft Start Time
Short Circuit Protection Block
Input Threshold Voltage
Charge Current
Latch Mode
ON Threshold Voltage
Latch Mode
OFF Threshold Voltage
Oscillator Block
RT Pin Voltage
Oscillation Frequency
Oscillate Supply Voltage
Fluctuations
Oscillate Temperature
Fluctuations
Ver.2005-03-01
SYMBOL
VT_ON
VT_OFF
VHYS
TSS
TEST CONDITION
V+= L → H
V+= H → L
VT_ON → Duty=80%
MIN.
TYP.
MAX.
UNIT
1.9
1.8
60
2.0
1.9
100
2.1
2.0
–
V
V
mV
8
16
24
ms
VT_PC
ICHG
FB Pin
VSCP=0V
0.95
1.5
1.00
2
1.05
2.5
V
µA
VT_LA
SCP Pin
0.95
1.00
1.05
V
VT_LAOFF
SCP Pin
0.2
0.45
0.7
V
-5%
630
0.5
700
+5%
770
V
kHz
VRT
fOSC
fDV
V+=2.2V ~ 8V
–
1
–
%
fDT
Ta=-40°C ~ +85°C
–
3
–
%
-3-
NJU7630
■ELECTRICAL CHARACTERISTICS (V+=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER
Error Amplifier Block
Reference Voltage
Input Bias Current
Open Loop Gain
Gain Bandwidth Product
Output Source Current
Output Sink Current
SYMBOL
TEST CONDITION
VB
IB
AV
GB
IOM+_1
IOM+_2
IOM-
VFB=1V, VIN-=0.9V
VFB=1V, VIN-=0.9V, V+=2.2V
VFB=1V, VIN-=1.1V
MIN.
TYP.
MAX.
UNIT
-1.0%
-0.1
–
–
25
4
0.10
1.00
–
80
1
55
9
0.16
+1.0%
0.1
–
–
95
16
0.22
V
µA
dB
MHz
mA
mA
mA
0.16
0.44
100
40
0.22
0.5
–
50
0.28
0.56
–
60
V
V
%
%
PWM Comparate Block
Input Threshold Voltage
Maximum Duty Cycle
Output Block
Output High Level
ON Resistance
Output Low Level
ON Resistance
General Characteristics
Quiescent Current
-4-
VT_0
VT_50
MAXDUTY_1
MAXDUTY_2
Duty=0%
Duty=50%
VFB=0.9V
VFB=0.9V, RDTC=47kΩ
ROH
IO=-20mA
–
10
20
Ω
ROL
IO=+20mA
–
5
10
Ω
RL=Non Load
–
800
1200
µA
IDD
Ver.2005-03-01
NJU7630
■ TYPICAL APPLICATIONS
Step-Down Converter
FET
L
VIN
VOUT
CIN
SBD
COUT
NJU7630
GND
RT
7
FB
DTC
6
IN-
SCP
5
OUT
2
V
3
C
R1
8
1
+
Ver.2005-03-01
4
RT
RDTC
CS
CNF
RNF
R2
CSCP
-5-
NJU7630
■TYPICAL CHARACTERISTICS
Oscillation Frequency vs. Timing Resistance
Oscillation Frequency fosc (kHz)
Oscillation Frequency fOSC (kHz)
1000
100
10
Oscillation Frequency vs. Operating Voltage
(V+=3.3V, Ta=25oC)
100
Timing Resistance RT (kΩ)
700
680
660
DTC
2
4
6
8
+
Operating Voltage V (V)
10
Reference Voltage vs. Operating Voltage
o
o
T
(V+=3.3V, Ta=25 C)
Reference Voltage VB (V)
1.004
80
60
40
20
0
0
(V =3.3V, R =47kΩ, Ta=25 C)
AX
Duty Cycle M D
UTY
(%)
100
T
720
Duty Cycle vs. R
+
(R =47kΩ, Ta=25oC)
740
1.002
1
0.998
0.996
0
20
40
60
80
100
Dead Time Control Resistance RDTC (kΩ)
0
2
4
6
8
+
Operating Voltage V (V)
10
Quiescent Current vs. Operating Voltage
o
(R =47kΩ, R =Non Load, Ta=25 C)
T
Quiescent Current IDD (uA)
1400
1200
1000
800
600
400
200
0
-6-
L
0
2
4
6
8
+
Operating Voltage V (V)
10
Ver.2005-03-01
NJU7630
■TYPICAL CHARACTERISTICS
Error Amplifier Block
Voltage Gain, Phase vs. Frequency
+
o
(V =3.3V, Gain=40dB, Ta=25 C)
Gain
30
90
15
45
+
V =1.95V
14
V+=3.3V
6
4
V+=8V
2
0
-50
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
100
V+=3.3V
10
V+=1.95V
1
-50
Ver.2005-03-01
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Output Sink Current IOM- (mA)
Error Amplifier Block
Output Source Current vs. Temperature
(VFB=1V, VIN-=0.9V)
V+=8V
0
10000
Output Block
Output Low Level ON Resistance
vs. Temperature (Io=+20mA)
12
10
8
OH
Output High Level ON Resistance
R
(Ω)
10
100
1000
Frequency f (kHz)
10
1000
Output Source Current IOM+ (mA)
1
Output Block
Output High Level ON Resistance
vs. Temperature (Io=-20mA)
12
135
Phase
0
0.1
14
180
Phase Φ (deg)
45
Output Low Level ON Resistance
ROL (Ω)
Voltage Gain Av (dB)
60
V+=1.95V
8
6
V+=3.3V
4
2
0
-50
0.2
0.15
V+=8V
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Error Amplifier Block
Output Sink Current vs. Temperature
(VFB=1V, VIN-=1.1V)
V+=1.95V, 3.3V, 8V
0.1
0.05
0
-50
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
-7-
NJU7630
■TYPICAL CHARACTERISTICS
Soft Start Time vs. Temperature
Reference Voltage vs. Temperature
+
(V =3.3V)
22
20
1.005
18
16
14
12
1
0.995
10
8
-50
0.99
-50
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
(V+=3.3V, R =47kΩ)
2.06
T
740
Threshold Voltage (V)
Oscillator Frequency fOSC (kHz)
Oscillator Frequency vs. Temperature
760
720
700
680
660
640
-50
(V+=3.3V)
1.01
Reference Voltage VB (V)
Soft Start Time Tss (ms)
24
Under Voltage Lockout Block
vs. Temperature
2.02
VT_ON
1.98
1.94
V
1.9
1.86
-50
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
T_OFF
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Quiescent Current vs. Temperature
Quiescent Current IDD (uA)
1000
T
800
600
400
200
0
-50
-8-
(V+=3.3V, R =47kΩ)
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
Ver.2005-03-01
NJU7630
MEMO
[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.
Ver.2005-03-01
-9-
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