NJRC NJU7680 2ch switching regulator ic Datasheet

NJU7680
2ch switching regulator IC
■GENERAL DESCRIPTION
The NJU7680 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.
Each channel has an on/off switch. Therefore, the power
sequence can be activated externally.
Internal soft-start function, dead time control and timer latch
function are included, and those functions can be easily controlled
by external component.
■PACKAGE OUTLINE
NJU7680V
NJU7680SED
(U.D.)
■FEATURES
● Step-Down, Step-Up/SEPIC circuit
● PWM switching control
● Operating Voltage
2.3V to 7V
● Wide Oscillator Range
300kHz to 1MHz
● Soft-Start Function
Internal: 4ms typ. or adjustable
● Channel ON/OFF Function
● Standby Quiescent Current
1µA max.
● Dead Time Control
● Timer Latch for Short Circuit Protection
● C-MOS Technology
● Package Outline
NJU7680V
: SSOP16
NJU7680SED
: PCSP24-ED (U.D.)
Ver.2010-03-31
-1-
NJU7680
■PIN CONFIGURATION
<SSOP16 package>
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
PIN FUNCTION
1. SCP
2. CE1
3. CE2
4. FB2
5. IN-2
6. V+
7. DTC2
8. OUT2
9. OUT1
10. DTC1
11. GND
12. GND
13. RT
14. VREG
15. IN-1
16. FB1
(Top View)
NJU7680V
<PCSP24-ED package>
18
17
16
15
14
13
13
19
12
12
20
11
11
14
15
10
10
22
9
9
17
18
19
20
PAD (*1)
21
16
PAD (*1)
21
22
PAD (*1)
PAD (*1)
23
8
8
23
24
7
7
24
1
2
3
4
5
6
6
(Top View)
5
4
3
2
1
PIN FUNCTION
1. N.C.
2. FB2
3. IN-2
4. N.C.
5. V+
6. N.C.
7. DTC2
8. N.C.
9. OUT2
10. N.C.
11. OUT1
12. N.C.
13. DTC1
14. GND
15. GND
16. RT
17. VREG
18. N.C.
19. IN-1
20. FB1
21. N.C.
22. SCP
23. CE1
24. CE2
(Bottom View)
NJU7680SED (U.D.)
(*1) The PAD is not connected to an IC chip electrically.
-2-
Ver.2010-03-31
NJU7680
■BLOCK DIAGRAM
V+
Vref
1V
2µA
+
VREG
V
Regulator
2V
UVLO
SCP
RT_ON
2kΩ
CE1
1V
ON/OFF
1V
SCP
CE2
FB1
IN-1
ER⋅AMP1
DTC1
PWM1
SST1
Buffer1
OUT1
DTC_COMP1
CH1
FB2
IN-2
ER⋅AMP2
DTC2
PWM2
SST2
Buffer2
OUT2
DTC_COMP2
CH2
0.8V
0.2V
GND
OSC
RT_ON
0.5V
+
V
RT
RT
RP
SW
•On/Off Function
The On/Off switch for each channel is controlled by CE pin.
→ Setting the CE low will turn off all applicable channels’ circuit.
→ Turning off both channels will turn off all circuit.
→ Opening the RT pin will turn off all circuit regardless of input signals from CE pin.
RT
H
H
H
H
L
L
L
L
Ver.2010-03-31
Input Signal
CE1
H
H
L
L
H
H
L
L
CE2
H
L
H
L
H
L
H
L
Operating State
CH1
CH2
ON
ON
ON
OFF
OFF
ON
OFF
Standby Mode
-3-
NJU7680
•Soft Start Feature (Soft Start)
The soft-start is internally set for 4ms typ. To adjust the time, insert resistance or connect capacitor to the DTC pin.
•Max Duty
Max Duty is set 90% for CH1 (Step-up) and 100% for CH2 (Step-down).
Max Duty can be adjusted by connecting the VERG pin to the DTC pin. When not limiting Max Duty, short the DTC pin
to the VREG terminal.
•Short Circuit Protection
The short circuit protection block employs time latch, and protection delay time can be adjusted by a capacitor
connected to SCP pin. The program of timer latch circuit can be reset by restarting the power (supply voltage must be
lower than UVLO sensing voltage), setting IC to standby status, or lowering SCP pin to GND level.
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
SYMBOL
Supply Voltage
V+
Output Pin Current
IO
CE1 Pin Voltage
VCE1
CE2 Pin Voltage
VCE2
Power Dissipation
PD
MAXIMUM RATINGS
+8
±50
+8 (*2)
+8 (*2)
SSOP16
: 300
PCSP24-ED : 475 (*3)
-40 ~ +85
-40 ~ +125
UNIT
V
mA
V
V
mW
°C
°C
(*2): When input voltage is less than 8V, the absolute maximum control voltage is equal to the input voltage.
(*3): Mounted on glass epoxy board based on EIA/JEDEC. (114.3 × 76.2 × 1.6mm: 2Layers)
Operating Temperature Range
Storage Temperature Range
TOPR
TSTG
■RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER
SYMBOL
MIN.
+
Operating Voltage
V
2.3
Oscillator Timing Resistor
30
RT
Oscillation Frequency
fOSC
300
-4-
TYP.
–
47
700
MAX.
7
120
1,000
UNIT
V
kΩ
kHz
Ver.2010-03-31
NJU7680
■ELECTRICAL CHARACTERISTICS (V+=VCE1=VCE2=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER
Voltage Regulator Block
Regulator Output Voltage
Line Regulation
Load Regulation
Maximum Output Current
Temp Fluctuations
Under Voltage Lockout Block
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
Regulator Output Detection
ON Threshold Voltage
Regulator Output Detection
OFF Threshold Voltage
Regulator Output Detection
Hysteresis Voltage
Short Circuit Protection Block
Input Threshold Voltage 1
Input Threshold Voltage 2
Charge Current
Latch Mode
ON Threshold Voltage
Latch Mode
OFF Threshold Voltage
Soft Start Block
Soft Start Time 1
Soft Start Time 2
Oscillator Block
RT Pin Voltage
Oscillation Frequency
Oscillate Supply
Voltage Fluctuations
Oscillate Temperature
Fluctuations
Standby RT Terminal
Resistance
Ver.2010-03-31
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
1.97
–
-10
4
–
2.0
±5
-1
–
±0.5
2.03
±15
–
–
–
V
mV
mV
mA
%
V+= L → H
V+= H → L
2.1
2.0
60
2.2
2.1
100
2.3
2.2
–
V
V
mV
VREG = L → H
1.6
1.7
1.8
V
VT_OFF_REG VREG = H → L
1.5
1.6
1.7
V
VHYS_REG
60
100
–
mV
VREG
VREG_LINE
VREG_LOAD
IREG_MAX
VREG_TC1
VT_ON
VT_OFF
VHYS
VT_ON_REG
+
V =2.2 ∼ 7V
IREG=0 ∼ 2mA
VREG=1.9V
Ta=-40 ∼ +85°C
VT_PC1
VT_PC2
ICHG
FB1 Pin
FB2 Pin
VSCP=0V
0.95
0.95
1.5
1.00
1.00
2
1.05
1.05
2.5
V
V
µA
VT_LA
SCP Pin
0.90
1.00
1.10
V
VT_LAOFF
SCP Pin
0.35
0.6
0.85
V
3
3
4
4
6
6
ms
ms
-5%
630
0.5
700
+5%
770
V
kHz
TSS1
TSS2
VT_ON → Duty1=80%
VT_ON → Duty2=80%
VRT
fOSC
fDV
V+=2.2 ~ 7V
–
1
–
%
fDT
Ta=-40°C ~ +85°C
–
3
–
%
–
2
–
MΩ
RT_STB
-5-
NJU7680
■ELECTRICAL CHARACTERISTICS (V+=VCE1=VCE2=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER
Error Amplifier Block
Reference Voltage 1
Reference Voltage 2
Input Bias Current 1
Input Bias Current 2
Open Loop Gain
Gain Bandwidth Product
Output Source Current 1
Output Source Current 2
Output Sink Current 1
Output Sink Current 2
SYMBOL
VB1
VB2
IB1
IB2
AV
GB
IOM+1
IOM+2
IOM-1
IOM-2
TEST CONDITION
VFB1=1V, VIN-1=0.9V
VFB2=1V, VIN-2=0.9V
VFB1=1V, VIN-1=1.1V
VFB2=1V, VIN-2=1.1V
MIN.
TYP.
MAX.
UNIT
-1.5%
-1.5%
-0.1
-0.1
–
–
17
17
0.5
0.5
1.00
1.00
–
–
80
1
32
32
2.5
2.5
+1.5%
+1.5%
0.1
0.1
–
–
47
47
5.0
5.0
V
V
µA
µA
dB
MHz
µA
µA
mA
mA
0.15
0.46
0.15
0.46
85
40
100
40
0.22
0.53
0.22
0.53
90
50
–
50
0.29
0.60
0.29
0.60
95
60
–
60
V
V
V
V
%
%
%
%
PWM Comparate Block
Input Threshold Voltage 1
Input Threshold Voltage 2
Maximum Duty Cycle 1 (*4)
Maximum Duty Cycle 2 (*4)
Output Block
Output High Level
ON Resistance 1
Output High Level
ON Resistance 2
Output Low Level
ON Resistance 1
Output Low Level
ON Resistance 2
ON/OFF Block
ON Control Voltage 1
OFF Control Voltage 1
ON Control Voltage 2
OFF Control Voltage 2
General Characteristics
Quiescent Current 1
Quiescent Current 2
Standby Current 1
Standby Current 2
-6-
VT_0_1
VT_50_1
VT_0_2
VT_50_2
MAXDUTY11
MAXDUTY12
MAXDUTY21
MAXDUTY22
Duty1=0%
Duty1=50%
Duty2=0%
Duty2=50%
VFB1=0.9V
VFB1=0.9V, VDTC1=0.53V
VFB2=0.9V
VFB2=0.9V, VDTC2=0.53V
ROH1
IOUT1=-20mA
–
5
10
Ω
ROH2
IOUT2=-20mA
–
5
10
Ω
ROL1
IOUT1=+20mA
–
5
10
Ω
ROL2
IOUT2=+20mA
–
5
10
Ω
VON1
VOFF1
VON2
VOFF2
CE1= L → H
CE1= H → L
CE2= L → H
CE2= H → L
1.2
–
1.2
–
–
–
–
–
V+
0.6
V+
0.6
V
V
V
V
–
–
–
–
1
0.7
–
–
1.6
1.2
3.0
1.0
mA
mA
µA
µA
IDD1
IDD2
IDD STB1
IDD STB2
RL=Non Load
Per channel ON
VCE1=VCE2=0V
RT=OPEN
Ver.2010-03-31
NJU7680
(*4) :
CH1 is a step-up converter that is intended to drive Nch MOSFET. OUT1 terminal output as High levels is defined as
the maximum duty cycle.
CH2 is a step-down converter that is intended to drive Pch MOSFET. OUT2 terminal output as Low level is defined as
the maximum duty cycle.
■TYPICAL APPLICATIONS
VOUT1
V+
GND
SCP
FB1
CE1
IN-1
CE2
VREG
FB2
RT
CREG=0.1µF
RT=47kΩ
NJU7680
IN-2
GND
V+
GND
DTC2
DTC1
OUT2
OUT1
VOUT2
0.1µF
CSCP=
0.1µF
Ver.2010-03-31
-7-
NJU7680
■TYPICAL CHARACTERISTICS
Oscillation Frequency vs. Operating Voltage
1000
Oscillation Frequency fosc (kHz)
(V+=3.3V, Ta=25oC)
Oscillation Frequency f
OSC
(kHz)
Oscillation Frequency vs. Timing Resistance
100
10
100
Timing Resistance RT (kΩ)
(R =47kΩ, Ta=25oC)
T
740
720
700
680
660
0
(Ta=25oC)
(Ta=25oC)
REG
(V)
10
VB1
1.01
1.005
Output Voltage ∆V
(V)
Reference Voltage V
B
1.015
VB2
1
0.995
0.99
V =7.0V
-10
V =3.3V
2
4
6
+
Operating Voltage V (V)
8
+
V+=2.3V
-20
-30
0
+
0
0
Quiescent Current vs. Operating Voltage
2
4
6
Output Current I REG (mA)
(R =47kΩ, R =Non Load, Ta=25 C)
L
-8-
DD_STB
IDD1
1500
1000
Standby Current I
Quiescent Current I
DD
( µA)
( µA)
T
2000
IDD2
500
0
2
4
6
+
Operating Voltage V (V)
8
8
Standby Current vs. Operating Voltage
o
0
8
Voltage Regulator Block Load Regulation
Reference Voltage vs. Operating Voltage
1.02
2
4
6
+
Operating Voltage V (V)
(Ta=25oC)
3
2.5
2
1.5
IDD_STB1
1
0.5
0
IDD_STB2
0
2
4
6
+
Operating Voltage V (V)
8
Ver.2010-03-31
NJU7680
■TYPICAL CHARACTERISTICS
Duty Cycle1 vs. Oscillator Frequency
Duty Cycle1 vs. DTC1 pin Voltage
(CH1, V =3.3V, Ta=25 C)
40
for f
20
300kHz,
500kHz,
700kHz,
1MHz
OSC
=
0
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
DTC1 pin Voltage VDTC1 (V)
UTY_1
60
(%)
UTY_2
AX
40
for f
20
300kHz,
500kHz,
700kHz,
1MHz
=
0
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
DTC2 pin Voltage VDTC2 (V)
V
DTC1
Voltage Gain Av (dB)
Ver.2010-03-31
1
45
100
(CH2, V+=3.3V, Ta=25oC)
V
DTC2
60
0.05V step
40
20
V
DTC2
0
200
=0.3V
400
600
800
1000
Oscillator Frequency f OSC (kHz)
180
135
Gain
30
90
15
45
1
=0.85V
80
Phase
0
0.1
=0.3V
400
600
800
1000
Oscillator Frequency f OSC (kHz)
Error Amplifier Block
Voltage Gain, Phase vs. Frequency
+
o
(V =3.3V, Gain=40dB, Ta=25 C)
60
=0.8V
Duty Cycle2 vs. Oscillator Frequency
(CH2, V =3.3V, Ta=25 C)
OSC
DTC1
20
o
Duty Cycle2 M D
UTY_2
60
Duty Cycle2 M D
80
AX
(%)
100
=1.0V
40
Duty Cycle2 vs. DTC2 pin Voltage
+
DTC1
0.05V step
0
200
1
V
V
AX
60
(CH1, V+=3.3V, Ta=25oC)
100
80
Duty Cycle1 M D
UTY_1
AX
(%)
(%)
100
80
Duty Cycle1 M D
o
10
100
1000
Frequency f (kHz)
Phase Φ (deg)
+
0
10000
-9-
NJU7680
15
Output Low Level ON Resistance
R (Ω)
Output Block
Output High Level ON Resistance
vs. Temperature (Io=-20mA)
20
V+=2.3V
+
V =3.3V
+
V =7V
5
0
-50
Output Block
Output Low Level ON Resistance
vs. Temperature (Io=+20mA)
20
15
V+=2.3V
+
V =3.3V
10
OL
10
OH
Output High Level ON Resistance
R
(Ω)
■TYPICAL CHARACTERISTICS
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
+
V =7V
5
0
-50
Soft Start Time vs. Temperature
Oscillator Frequency vs. Temperature
+
(V =3.3V)
(kHz)
760
5.5
4.5
4
3.5
3
2.5
2
-50
700
680
660
640
-50
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Reference Voltage V
1.005
1
0.995
0.99
0.985
-50
- 10 -
(V)
REG
B
1.01
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Voltage Regulator Block
Output Voltage vs. Temperature
Regulator Output Voltage V
(V)
(V+=3.3V)
T
720
Reference Voltage vs. Temperature
1.015
(V+=3.3V, R =47kΩ)
740
OSC
5
Oscillator Frequency f
Soft Start Time Tss (ms)
6
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
2.04
(V+=3.3V, IREG =0mA)
2.03
2.02
2.01
2
1.99
1.98
1.97
1.96
-50
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Ver.2010-03-31
NJU7680
■TYPICAL CHARACTERISTICS
( µA)
T
DD_STB
2
Standby Current vs. Temperature
(V+=3.3V, R =47kΩ)
1.5
1
0.5
0
-50
IDD1
Standby Current I
Quiescent Current I
DD
(mA)
Quiescent Current vs. Temperature
IDD2
Threshold Voltage (V)
2.2
:V
CE1
=V
CE2
=0V
IDD_STB2: RT=OPEN
1.5
IDD_STB1
1
0.5
I
DD_STB2
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Under Voltage Lockout Block
vs. Temperature
VT_ON
V
1.8
V
1.4
-50
DD_STB1
2
0
-50
2
1.6
T
I
2.5
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
2.4
(V+=3.3V, R =47kΩ)
3
T_OFF
T_ON_REG
VT_OFF_REG
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
[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.2010-03-31
- 11 -
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