Preliminary Datasheet
LP3808
High-precision Low Voltage Detector
General Description
LP3808 is a series of high precision voltage detector
with ultra low current consumption(500nA typ. at
Vdd=3.0V). It can work at very low voltage, which
makes it perfect for system reset.
LP3808 is composed of high precision voltage
reference, comparator, output driver and resistor array.
Internally preset detect voltage has a low temperature
drift and requires no external trimming.
Two type of output, CMOS and N-channel open-drain are
available.LP3808 is available in SOT-89-3,SOT-23-3, SOT23-5
packages which is Pb free.
Feature
High-precision detection Voltage 2%
Detection Voltage 0.9V~6.0V (in 0.1V steps)
Precise hysteresis 4% typ.
Operating Voltage range 0.7V~10V
Ultra-low current consumption 500nA typ. (at V
DD
3.0V)
Two Output forms CMOS and N-channel open-drain
Application
Power monitor for portable equipment such as
PDA,DSC,Mobile phone,Notebook,MP3
CPU and Logic Circuit Reset
Battery Checker
Battery Back-up Circuit
Power Failure Detector
Ordering Information
LP3808 -
□ □ □
□ □
□
F: Pb-Free
Package Type
B3: SOT23-3
B5: SOT23-5
X3: SOT89-3
Output Type
C: CMOS Output
N: Nch Open Drain
Detector Voltage
09: 0.9V
10: 1.0V
.
.
.
50: 5.0V
60: 6.0V
Pin Assignment
Pin Description
Pin Number
SOT89 SOT23 SOT25
1
1
1
2
3
3
2
2
3
4,5
Pin
Name
Vout
VDD
VSS
NC
Function
Voltage Detection output
Pin
Voltage input pin
GND pin
No Connection
Marketing information
Please see website.
LP3808 – 00 Ver. 1.0 Datasheet
Dec.-2006
Page 1 of 5
Preliminary Datasheet
LP3808
Block diagram
Nch Output Open Drain
CMOS Output Type
Absolute Maximum Ratings
Input Voltage range ----------------------------------------------------------------------------------- -0.3V~12V
Output Voltage range --------------------------------------------------------------------------------- -0.3V~12V
Maximum Output current----------------------------------------------------------------------------- 70mA
Maximum power dissipation------------------------------------------------------------------------- 150mW
Ambient temperature---------------------------------------------------------------------------------- -40~+70 C
Storage temperature ---------------------------------------------------------------------------------- -40~125 C
Lead temperature and time-------------------------------------------------------------------------- 260 C,10S
Electrical Characteristics
(LP3808-27B3F,T=25°C,
Unless otherwise specified.)
Symbol
Parameter
Conditions
-V
DET
V
HYS
I
SS
V
DDH
V
DDL
I
OUT
Detector Threshold
Detector Threshold Hysteresis
Current consumption
Maximum operating
voltage
Minimum Operating
voltage
Output current
Min.
2.646
0.054
Reference data
Typ.
2.7
0.108
0.5
Unit
Max.
2.754
0.162
1
10
V
V
uA
V
V
0.5
Nch
V
DS
=0.05V
V
DD
=0.70V
Pch
V
DS
=-2.1V
V
DD
=4.50V
0.01
0.05
mA
1.0
2.0
mA
T
PLH
Output Delay Time
20
uS
LP3808 – 00 Ver. 1.0 Datasheet
Dec.-2006
Page 2 of 5
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