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LD6902 데이터시트 PDF




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부품번호 LD6902 기능
기능 High Voltage Linear Regulator
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LD6902 데이터시트, 핀배열, 회로
High Voltage Linear Regulator
LD6902
12/15/2005
REV: 03
General Description
The LD6902 is a high voltage, micropower linear regulator,
which features wide input voltage, low-noise, low-dropout
and low-quiescent current. The precision of feedback
reference voltage is within ±2% and output current is up to
90mA.
The LD6902 can also be used as a WLED driver. The
external soft start function provides a flexible way to limit the
startup current.
Features
z ±2% feedback reference
z Shutdown current <1µA (TYP)
z High input voltage: up to 21V
z Thermal shutdown and current limit protection
z Soft start operation
Applications
z Microcontroller Power
z Hand-Held Instruments
+Patent pending
Typical Application
VIN/15V
0.1µF/X5R
3.3nF
VIN OUT
LD6902
CE
R1/100K
SS
GND
FB
R2/20K
VOUT/7.5V
4.7µF/X5R
Fig.1 High voltage linear regulator application
Leadtrend Technology Corporation
LD6902-DS-03 December, 2005
1




LD6902 pdf, 반도체, 판매, 대치품
Block Diagram
1.25V
CE Chip Enable
SS Soft Start Block
LD6902
VIN
Current limit
and Thermal
Shutdown
OUT
FB
GND
Absolute Maximum Ratings
VIN Pin
OUT Pin
SS, CE, FB Pin
Power dissipation
Operating Temperature Range
Operating Junction Temperature
Storage Temperature Range
Lead temperature (SOT-26, Soldering, 10sec)
ESD Level (Human Body Model)
ESD Level (Machine Model)
…..
Continuous Power Dispassion derate 7.1mW/ °C above 70°C
-0.3V~23V
-0.9V~23V
-0.3V~(VIN+0.3)V
570mW
-30°C to 85°C
125°C
-55°C to 125°C
260°C
2KV
200V
Caution:
Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only
rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not
implied.
Leadtrend Technology Corporation
LD6902-DS-03 December, 2005
4

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LD6902 전자부품, 판매, 대치품
LD6902
Application Information
Capacitor Selection
The input capacitor is needed between the input and GND
to stabilize Vin. The input capacitor should be at lease 0.1uF
to have a beneficial effect. Higher values will improve line
transient response.
The LD6902 requires an output capacitor to stabilize the
internal control loop. For stable operation, the output
capacitor should use at least 1uF for loads smaller than
4.5mA, 0.23uF/mA for loads greater than 4.5mA and its ESR
must be less than 1 ohm.
Thermal Shutdown
When the junction temperature exceeds Tj=125°C, the
thermal sensor will turn off the pass transistor and allowing
the IC to cool. The thermal sensor turns the pass transistor
on after the IC’s junction temperature cools by 20°C
(typical).
X5R or X7R type capacitors are recommended for input and
output capacitors.
Current Limit
Output current is limited to 90mA (typical). When current
limit engages, the output voltage scales back linearly until
the overcurrent condition ends. Take care not to exceed the
power dispassion ratings of the package.
Leadtrend Technology Corporation
LD6902-DS-03 December, 2005
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