RT9005B 데이터 시트보기 (PDF) - Richtek Technology
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RT9005B Datasheet PDF : 10 Pages
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RT9005A/B
Preliminary
Typical Application Circuit
VIN1
VOUT1
2N7002
EN
CIN1
2.2uF CBP
10nF
2
VIN1
1 BP
3
VIN2
VCNTL 4
8 VOUT1
COUT1 RT9005A/B
R1 2.2uF
VOUT2 6
5 VREFEN
R2
CSS
GND
1uF
7,
Exposed Pad(9)
VIN2
CIN2
470uF
VCTNL = 3.3V
CVCNTL
47uF RTT
COUT2
470uF
GND
Note : If there is any application need to use 10μF ceramic capacitor in front of RTT, please shut one 1000μF (Aluminum
eletrolytic capacitor).
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
BP
7,
GND
Exposed Pad (9)
2
VIN1
Noise Reduction. Connecting a 10nF capacitor to GND to reduce output noise.
Common Ground (T he exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation). The GND pad are a should be
as large as possible and using many vias to conduct the heat into the buried GND
plate of PCB layer.
Linear Regulator Power Input Voltage.
Input voltage which supplies current to the output pin. Connect this pin to a
well-decoupled supply voltage. To prevent the input rail from dropping during large
3
VIN2
load transient, a large, low ESR capacitor is recommended to use. The capacitor
should be placed as close as possible to the VIN2 pin.
VCNTL supplies the internal control circuitr y and provides the drive voltage. The
driving capability of output current is proportioned to the VCNTL. Connect this pin
4
VCNTL
to 3.3V bias supply to handle large output current with at least 10uF capacitor from
this pin to GND.
Reference voltage input and active low VOUT2 shutdown control pin. Two resistors
dividing down the VIN voltage on the pin to create the regulated output voltage.
5
VREFEN
Pulling the pin to ground turns off the device by an open-drain, such as 2N7002,
signal N-MOSFET.
Regulator Output. VOUT2 is regulated to REFEN voltage that is used to terminate
the bus resistors. It is capable of sinking and sourcing current while regulating the
6
VOUT2 output rail. To maintain adequate large signal transient response, typical value of
1000μF AL electrolytic capacitor with 10μF ceramic capacitors are recommended to
reduce the effects of current transients on VOUT.
8
VOUT1 Regulator 2.5V/1.8/1.5V Output.
www.richtek.com
2
DS9005A/B-01 September 2007
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