NJM2873
LOW DROPOUT VOLTAGE REGULATOR
!
GENERAL DESCRIPTION
The NJM2873 is low dropout voltage regulator designed for cellular
phone application.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
!
FEATURES
"
High Ripple Rejection
70dB typ. (f=1kHz)
"
Output Noise Voltage
Vno=30µVrms (Cp=0.01µF)
"
Output capacitor with 1.0µF ceramic capacitor (Vo≥2.7V)
"
Output Current
Io(max.)=150mA
"
High Precision Output
Vo±1%
"
Low Dropout Voltage
0.10V typ. (Io=60mA)
"
ON/OFF Control
(Active High)
"
Internal Short Circuit Current Limit
"
Internal Thermal Overload Protection
"
Bipolar Technology
"
Package Outline
FFP12-B1 (2.0×2.0×0.85mm)
!
PIN CONFIGURATION
9
10
11
12
1
2
3
8
7
6
5
4
6
5
4
3
2
1
7
8
9
10
11
12
!
PACKAGE OUTLINE
NJM2873PB1
PIN FUNCTION
1. V
IN
2. V
IN
3. V
IN
4. CONTROL
5. GND
6. GND
7. GND
8. NOISE BYPASS
9. NC
10. V
OUT
11. V
OUT
12. V
OUT
TOP
BOTTOM
NJM2873PB1
!
EQUIVALENT CIRCUIT
V
IN
Cont
Bandgap
Reference
Thermal
Protection
V
OUT
Noise Bypass
GND
Ver.2006-02-22
-1-
NJM2873
!
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
NJM2873PB1-21
2.1V
NJM2873PB1-25
2.5V
NJM2873PB1-26
2.6V
NJM2873PB1-27
2.7V
NJM2873PB1-28
2.8V
NJM2873PB1-285
2.85V
NJM2873PB1-03
3.0V
NJM2873PB1-33
3.3V
NJM2873PB1-38
3.8V
NJM2873PB1-05
5.0V
!
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
P
D
Operating Temperature
Topr
Storage Temperature
Tstg
(Ta=25°C)
RATINGS
UNIT
+14
V
+14(*1)
V
300(*2)
mW
−40 ∼
+85
°C
−40 ∼
+125
°C
(*1): When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage.
(*2): On board. 25mm#25mm#0.2mm
!
ELECTRICAL CHARACTERISTICS
(V
IN
=Vo+1V, C
IN
=0.1uF, Co=1.0uF: Vo≥2.7V (Co=2.2uF: Vo≤2.6V), Cp=0.01uF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
Output Voltage
Vo
Io=30mA
-1%
Quiescent Current
I
Q
Io=0mA, expect Icont
−
Quiescent Current
V
CONT
=0V
I
Q(OFF)
−
at Control OFF
Output Current
Io
Vo - 0.3V
150
Line Regulation
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
−
Load Regulation
∆Vo/∆Io
Io=0
∼
100mA
−
Io=60mA
Dropout Voltage
∆V
I−O
−
ein=200mVrms,f=1kHz, Io=10mA
Ripple Rejection
RR
−
Vo=3V Version
Average Temperature
∆Vo/∆Ta
Ta=0∼85°C, Io=10mA
−
Coefficient of Output Voltage
f=10Hz∼80kHz, Io=10mA,
Output Noise Voltage
V
NO
−
Vo=3V Version
Control Voltage for ON-state
V
CONT(ON)
1.6
Control Voltage for OFF-state
V
CONT(OFF)
−
The above specification is a common specification for all output voltages.
Therefore, it may be different from the individual specification for a specific output voltage.
TYP.
−
120
−
200
−
−
0.10
70
±50
30
−
−
MAX.
+1%
180
100
-
0.10
0.03
0.18
−
−
−
−
0.6
UNIT
V
µA
nA
mA
%/V
%/mA
V
dB
ppm/°C
µVrms
V
V
-2-
Ver.2006-02-22
NJM2873
!
TEST CIRCUIT
1.0µF *3
V
OUT
V
OUT
V
OUT
(ceramic)
I
OUT
V
V
OUT
V
IN
NC
I
IN
V
IN
A
0.1µF
V
IN
NJM2873
NOISE
BYPASS
Cp=0.01µF
V
IN
CONTROL
GND
GND
GND
A
I
CONT
V
V
CONT
*3 Vo≤2.6V version: Co=2.2µF(ceramic)
Ver.2006-02-22
-3-
NJM2873
!
TYPICAL APPLICATION
1
In the case where ON/OFF Control is not required:
V
OUT
V
OUT
V
OUT
V
OUT
1.0µF *4
V
IN
NC
V
IN
V
IN
0.1µF
NJM2873
NOISE
BYPASS
V
IN
GND
R
(0 ~ 300kΩ)
CONTROL
GND
GND
*4 Vo≤2.6V version: Co=2.2µF
Connect control terminal to V
IN
terminal
-4-
Ver.2006-02-22
NJM2873
2
In use of ON/OFF CONTROL:
V
OUT
V
OUT
V
OUT
V
OUT
1.0µF *4
V
IN
NC
V
IN
V
IN
NJM2873
NOISE
BYPASS
Cp=0.01µF
0.1µF
V
IN
GND
R
(0 ~ 300kΩ)
CONTROL
GND
GND
*4 Vo≤2.6V version: Co=2.2µF
State of control terminal:
•“H”→
output is enabled.
•“L”
or “open”
→
output is disabled.
&Noise
bypass Capacitance Cp
Noise bypass capacitance Cp reduces noise generated by band-gap reference circuit. Noise level and ripple
rejection will be improved when larger Cp is used. Use of smaller Cp value may cause oscillation.
Use the Cp value of 0.01µF greater to avoid the problem.
&In
the case of using a resistance "R" between V
IN
and control.
The current flow into the control terminal while the IC is ON state (I
CONT
) can be reduced when a pull up resistance
"R" is inserted between V
IN
and the control terminal.
The minimum control voltage for ON state (V
CONT (ON)
) is increased due to the voltage drop caused by I
CONT
and the
resistance "R". The I
CONT
is temperature dependence as shown in the "Control Current vs. Temperature"
characteristics. Therefore, the resistance "R" should be carefully selected to ensure the control voltage exceeds the
V
CONT (ON)
over the required temperature range.
Ver.2006-02-22
-5-
嵌入式系统
