NJRC NJM2805U2923 Low dropout voltage regulator with reset Datasheet

NJM2805
Low Dropout Voltage Regulator with Reset
! GENERAL DISCRIPTION
The NJM2805 is a low dropout voltage regulator with reset
function.
It provides up to 300mA of logic supply, and the reset function
monitors output voltage of the regulator with 1% accuracy.
It is suitable for local power supply and reset for small micro
controller and other logic chips.
! FEATURES
" Output Voltage Accuracy
Vo ±1.0%
" Reset Voltage Accuracy
VRT ±1.0%
" Reset Hold Time
td = 10mS±1.0mS
" Ripple Rejection
70dB typ. (f =1kHz)
" Quiescent Current
IQ = 250µA (typ.)
" Output Voltage Monitor type
" Open Collector Output
" Internal Short Circuit Current Limit
" Internal Thermal Overload Protection
" Bipolar Technology
" Package Outline
SOT-89 -5
! PACKAGE OUTLINE
NJM2805U
! PIN CONFIGURATION
5
2
4
1
2
3
PIN FUNCTION
1.VOUT
2.GND
3.Cd
4.VOR
5.VIN
NJM2805U
! OUTPUT VOLTAGE/ DETECTION VOLTAGE
Device Name
VOUT
VDET
NJM2805U2923
2.9V
2.3V
NJM2805U3329
3.3V
2.9V
NJM2805U0543
5.0V
4.3V
! EQUIVALENT CIRCUIT
VIN
VOUT
Thermal
Protection
VOR
Bandgap
Reference
GND
Cd
Ver.2004-01-19
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NJM2805
! ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
(Ta=25°C)
UNIT
Input Voltage
VIN
+14
V
Power Dissipation
PD
350
mW
Operating Temperature
Topr
-40 ∼ +85
°C
Storage Temperature
Tstg
-40 ∼ +125
°C
! ELECTRICAL CHARACTERISTICS
(VIN=Vo+1V, CIN=0.1µF, Co=1µF (Co=2.2µF: Vo≤2.6V) Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Quiescent Current
Regulator Block
IQ
Io=0mA
−
250
350
µA
Output Voltage
Vo
Io=30mA
-1.0%
+1.0%
V
Output Current
Io
Vo-0.3V
300
−
400
mA
Line Regulation
∆Vo/∆VIN
VIN=Vo+1V ∼ Vo+6V, Io=30mA
−
−
−
0.10
%/V
Load Regulation
∆Vo/∆Io
%/mA
−
−
0.10
0.03
∆VI_O
Io=0 ∼ 300mA
Io=100mA
−
Dropout Voltage
0.18
V
Ripple Rejection
RR
ein=200mVrms, f=1kHz, Io=10mA,Vo=3V
−
70
−
dB
Ta=0 ∼ 85°C, Io=10mA
−
±50
−
ppm/°C
VNO
f=10Hz ∼ 100kHz, Io=10mA, Vo=3V
−
45
−
µVrms
Voltage Detection
VRT
VIN=H→L
Hysteresis Voltage
Low Level Output Voltage
Output Leak Current
VRTH
RORL
IORH
VIN=H→L→H
VIN=VRT-0.5V, RL=100kΩ
VIN= VRT+0.5V
On time Output Current
IORL
Output Voltage
Temperature Coefficient
Output Noise Voltage
∆Vo/∆T
Reset Block
Reset Output Delay Time
Operation Voltage Limit
td
VOPL
-1.0%
+1.0%
−
VRT×3 VRT×5 VRT×8
100
300
−
0.1
−
−
V
mV
mV
µA
mA
VIN=VRT-0.5V, RL=0Ω
5
VIN=(VRT-0.5V)→ (VRT+0.5V), Cd=0.1µF
9
−
10
−
11
mS
VORL=0.4V
−
0.9
−
V
(*note 1): 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.
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Ver.2004-01-19
NJM2805
! TIMING CHART
VIN[V]
VO
t
VO[V]
VO
VRTH
VRT
t
VOR[V]
VO
td
td
td
t
∗ When the pull-up of the VOR is carried out to VIN through resistance.
Ver.2004-01-19
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NJM2805
! TEST CIRCUIT
IQ
VIN
VO
IOR
NJM2805
RL
0.1µF
Cd
VIN
V
VOR
1.0µF
GND
V
0.1µF
IOUT
VOUT
VOR
! TYPICAL APPLICATIONS
VIN
VIN
VO
NJM2805
100kΩ
0.1µF
Cd
VOUT
VOR
1.0µF
VOR
GND
0.1µF
-4-
Ver.2004-01-19
NJM2805
[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.2004-01-19
-5-
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