RT8299 Ver la hoja de datos (PDF) - Richtek Technology
Número de pieza
componentes Descripción
Fabricante
RT8299 Datasheet PDF : 15 Pages
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RT8299
Functional Pin Description
Pin No.
SOP-8
(Exposed Pad)
WDFN-10L 3x3
Pin Name
1
5
BOOT
2
6, 7
VIN
3
8, 9
SW
4, 9
(Exposed Pad)
10, 11
(Exposed Pad)
GND
5
1
FB
6
3
EN
7
2
PGOOD
8
4
VCC
Pin Function
Bootstrap for High Side Gate Driver. Connect a 0.1μF or greater
ceramic capacitor from BOOT to SW pin.
Supply Input Voltage. Must bypass with a suitably large ceramic
capacitor.
Switch Node. Connect to external LC filter.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Feedback Input. This pin is connected to the converter output. It
is used to regulate the output of the converter to a desired value
via an internal resistive voltage divider. For an adjustable output,
an external resistive voltage divider is connected to this pin.
Enable Input. A logic high enables the converter; a logic low
forces the RT8299 into shutdown mode, reducing the supply
current to less than 3μA. Attach this pin to VIN with a 100kΩ pull
up resistor for automatic startup.
Power Good Output. The output of this pin is open drain.
Bias Supply.
Function Block Diagram
VIN
EN
VCC
FB
PGOOD
5k
Comparator
-
3V
+
Regulator
2V
Ramp
Generator
Oscillator
500kHz
Reference
PGOOD
Generator
+
- Error
Amplifier
300k 30pF
1pF
Current Sense
Amplifier -
+
SQ
+
RQ
-
PWM
Comparator
OC Limit
Clamp
Driver
BOOT
SW
GND
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8299-01 May 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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