NJU7690
High Efficiency Synchronous Step-Down switching regulator IC
■
GENERAL DESCRIPTION
The
NJU7690
is a high efficiency synchronous step-down
switching regulator control IC. It offers high efficiency power supply
circuits in applications by synchronous rectification. The NJU7690
also has a soft-start function, dead time control and timer latch for
short circuit protection and their times are all adjustable with
external parts. It is available in a small and thin 10-lead MSOP
(TVSP) package. It is suitable for battery powered applications.
■
PACKAGE OUTLINE
NJU7690RB2
(MSOP10 (TVSP10))
■
FEATURES
●
Synchronous Rectification
●
PWM switching control
●
Standby Function
●
Operating Voltage
2.2V to 8V
●
Wide Oscillator Range 300kHz to 1MHz
●
Maximum Duty Cycle
100%
●
Quiescent Current
Operating :800µA typ.
Standby :1µA max.
●
Soft-Start Function
Internal : 16ms typ. or adjustable
●
Dead Time Control
●
Timer Latch for Short Circuit Protection
●
C-MOS Technology
●
Package Outline
NJU7690RB2 : TVSP10
■
PRODUCT VARIATION
NJU7690
Synchronous
rectification
NJU7631
PWM/PFM
Light Load to
Efficiency
NJU7630
PWM Control
■
PIN CONFIGURATION
PIN FUNCTION
1. OUTP
2. V
+
3. FB
4. IN-
5. SCP
6. ON/OFF
7. DTC
8. RT
9. GND
10. OUTN
1
2
3
4
5
10
9
8
7
6
NJU7690RB2
Ver.2012-08-03
-1-
NJU7690
■
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER
SYMBOL
Supply Voltage
V
+
Output Pin Current
I
O
Power Dissipation
P
D
Operating Temperature Range
T
OPR
Storage Temperature Range
T
STG
MAXIMUM RATINGS
+9
±50
MSOP8 (TVSP8) :320
-40 to +85
-40 to +125
UNIT
V
mA
mW
°C
°C
■
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN.
+
Operating Voltage
V
2.2
Oscillator Timing Resistor
R
T
30
Oscillation Frequency
f
OSC
300
TYP.
–
47
700
MAX.
8
120
1,000
(Ta=25°C)
UNIT
V
kΩ
kHz
■
ELECTRICAL CHARACTERISTICS
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
SYMBOL
(V
+
= V
ON/OFF
=3.3V, R
T
=47kΩ, Ta=25°C)
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
V
T_ON
V
T_OFF
V
HYS
V
+
= L
→
H
V
+
= H
→
L
1.9
1.8
60
2.0
1.9
100
2.1
2.0
–
V
V
mV
T
SS
V
T_ON
→
Duty=80%
8
16
24
ms
V
T_PC
I
CHG
V
T_LA
V
T_LAOFF
FB Pin
V
SCP
=0V
SCP Pin
SCP Pin
0.95
1.5
0.95
0.20
1.00
2
1.00
0.45
1.05
2.5
1.05
0.70
V
µA
V
V
V
RT
f
OSC
f
DV
f
DT
V
+
=2.2V to 8V
Ta=-40°C to +85°C
-10%
630
–
–
0.5
700
1
3
+10%
770
–
–
V
kHz
%
%
Ver.2012-08-03
-3-
模拟电子
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