RT8206L RICHTEK [Richtek Technology Corporation], RT8206L Datasheet - Page 6

• Manufacturer Part Number: RT8206L
• Description: High Efficiency, Main Power Supply Controller for Notebook Computers
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT8206L/M
Functional Pin Description
REF
2V Reference Output. Bypass to GND with a 0.22μF
capacitor. REF can source up to 50μA for external loads.
Loading REF degrades FBx and output accuracy according
to the REF load-regulation error.
TON
Frequency Select Input. (VOUT1/VOUT2 switching
frequency, respectively) :
TON = VCC, (200kHz / 300kHz)
TON = REF, (300kHz / 400kHz)
TON = GND, (400kHz / 500kHz)
VCC
Analog Supply Voltage Input for the PWM Core. Bypass
to GND with a 1μF ceramic capacitor
ENLDO
LDO Enable Input. REF and LDO are enabled if ENLDO
is within logic high level and disabled if ENLDO is less
than the logic low level.
NC
No Internal Connection.
VIN
Power Supply Input. VIN is used for the constant on-time
PWM one shot circuits. VIN is also used to power the
linear regulators. The linear regulators are powered by
SMPS1 if VOUT1 is set greater than 4.66V and BYP is
tied to VOUT1. Connect VIN to the battery input and
bypass with a 1μF capacitor.
LDO
Linear-Regulator Output. LDO can provide a total of 70mA
external loads. The LDO regulates a fixed 5V output. When
the BYP is within 5V switchover threshold, the internal
regulator shuts down and the LDO output pin connects to
BYP through a 1.5Ω switch. Bypass LDO output with a
minimum of 4.7μF ceramic.
Copyright
www.richtek.com
6
(Pin 5, 8)
(Pin 6)
(Pin 1)
(Pin 2)
(Pin 3)
(Pin 7)
©
(Pin 4)
2012 Richtek Technology Corporation. All rights reserved.
BYP
Switchover Source Voltage Input for LDO.
VOUT1
SMPS1 Output Voltage Sense Input. Connect this pin to
the SMPS1 output. VOUT1 is an input to the constant
on-time-PWM one-shot circuit. It also serves as the
SMPS1 feedback input in fixed-voltage mode.
FB1
SMPS1 Feedback Input. Connect FB1 to VCC or GND for
fixed 5V operation. Connect FB1 to a resistive voltage-
divider from VOUT1 to GND to adjust output from 2V to
5.5V.
ILIM1
SMPS1 Current Limit Adjustment. The GND − PHASE1
current-limit threshold is 1/10th the voltage seen at ILIM1
over a 0.5V to
source from VCC to ILIM1. The logic current limit threshold
defaults to 100mV if ILIM1 is higher than (VCC − 1V).
PGOOD1
SMPS1 Power Good Open-Drain Output. PGOOD1 is low
when the SMPS1 output voltage is more than 10% below
the normal regulation point or during soft-start. PGOOD1
is in high impedance when the output is in regulation and
the soft-start circuit has terminated. PGOOD1 is low in
shutdown.
EN1
SMPS1 Enable Input. The SMPS1 will be enabled if EN1
is greater than the logic high level and disabled if EN1 is
less than the logic low level. If EN1 is connected to REF,
SMPS1 starts after SMPS2 reaches regulation (delay
start). Drive EN1 below 0.8V to clear fault level and reset
the fault latches.
UGATE1
High Side MOSFET Floating Gate-Driver Output for
SMPS1. UGATE1 swings between PHASE1 and BOOT1.
is a registered trademark of Richtek Technology Corporation.
(Pin 11)
(Pin 14)
(Pin 9)
(Pin 12)
(Pin 10)
(Pin 15)
(Pin 13)
2.5V
range. There is an internal 5μA current
DS8206L/M-07 June 2012