RT8205A RICHTEK [Richtek Technology Corporation], RT8205A Datasheet - Page 8
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RT8205A
Manufacturer Part Number
RT8205A
Description
High Efficiency, Main Power Supply Controllers for Notebook Computers
Manufacturer
RICHTEK [Richtek Technology Corporation]
Datasheet
1.RT8205A.pdf
(28 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
RT8205AGQW
Manufacturer:
RICHTEK/立锜
Quantity:
20 000
RT8205A/B/C
GND [Pin 15 (RT8205A), Exposed Pad (25)]
Analog Ground for SMPS controller. The exposed pad
must be soldered to a large PCB and connected to GND
for maximum power dissipation.
PGND (Pin 15) (RT8205B/C)
Power Ground for SMPS controller. Connect PGND
externally to the underside of the exposed pad.
VIN (Pin 16)
High Voltage Power Supply Input for 5V/3.3V LDO and
Feed-forward ON-Time circuitry.
VREG5 (Pin 17)
5V Linear Regulator Output.VREG5 is also the supply
voltage for the low-side MOSFET driver and analog supply
voltage for the device.
NC (Pin 18) (RT8205A)
No Internal Connection.
LG1_CP (Pin 18) (RT8205B)
Alternative LGATE1 Output for 14V charge pump.
SECFB (Pin 18) (RT8205C)
The SECFB is used to monitor the optional external 14V
charge pump. Connect a resistive voltage-divider from 14V
charge pump output to GND to detect the output. If SECFB
drops below the threshold voltage, LGATE1 turns on for
300ns (typ.). This will refresh the external charge pump
driven by LGATE1 without over-discharging the output
voltage.
LGATE1 (Pin 19)
SMPS1 Synchronous-Rectifier Gate-Drive Output.
LGATE1 swings between GND and VREG5.
PHASE1 (Pin 20)
Inductor Connection for SMPS1. PHASE1 is the internal
lower supply rail for the UGATE1 high-side gate driver.
PHASE1 is also the current-sense input for the SMPS1.
Copyright
www.richtek.com
8
©
2012 Richtek Technology Corporation. All rights reserved.
UGATE1 (Pin 21)
High-Side MOSFET Floating Gate-Driver Output for
SMPS1. UGATE1 swings between PHASE1 and BOOT1.
BOOT1 (Pin 22)
Boost Flying Capacitor Connection for SMPS1. Connect
to an external capacitor according to the typical application
circuits.
PGOOD (Pin 23)
Power Good Output for channel 1 and channel 2. (Logical
AND)
VOUT1 (Pin 24)
SMPS1 Output Voltage-Sense Input. Connect to the
SMPS1 output. VOUT1 is an input to the on-time one-
shot circuit. It also serves as the SMPS1 feedback input
in fixed-voltage mode.
is a registered trademark of Richtek Technology Corporation.
DS8205A/B/C-06 July 2012