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PDF RT8206A Data sheet ( Hoja de datos )
| Número de pieza | RT8206A | |
| Descripción | (RT8206A/B) Main Power Supply Controllers | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8206A (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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RT8206A/B
High-Efficiency, Main Power Supply Controllers
for Notebook Computers
General Description
The RT8206A/B dual step-down, switch-mode power-
supply (SMPS) controller generates logic-supply voltages
in battery-powered systems. The RT8206A/B includes two
pulse-width modulation (PWM) controllers fixed at 5V/
3.3V or adjustable from 2V to 5.5V. An optional external
charge pump can be monitored through SECFB
(RT8206A). This device also features a linear regulator
providing a fixed 5V output. The linear regulator provides
up to 70mA output current with automatic linear-regulator
bootstrapping to the BYP input. The RT8206A/B includes
on-board power-up sequencing, the power-good outputs,
internal soft-start, and internal soft-discharge output that
prevents negative voltages on shutdown.
A constant on-time PWM control scheme operates without
sense resistors and provides 100ns response to load
transients while maintaining a relatively constant switching
frequency. The unique ultrasonic mode maintains the
switching frequency above 25kHz, which eliminates noise
in audio applications. Other features include diode-
emulation mode (DEM), which maximizes efficiency in
light-load applications, and fixed-frequency PWM mode,
which reduces RF interference in sensitive application.
The RT8206A/B is available in the WQFN-32L 5x5
package.
Applications
z Notebook and Sub-Notebook Computers
z 3-Cell and 4-Cell Li+ Battery-Powered Devices
Features
z Wide Input Voltage Range 6V to 25V
z Dual Fixed 5V/3.3V Outputs or Adjustable from 2V
to 5.5V, 1.5% Accuracy
z Secondary Feedback Input Maintains Charge Pump
Voltage (RT8206A)
z Independent Enable and Power Good
z 5V Fixed LDO Output : 70mA
z 2V Reference Voltage ±1% : 50uA
z Constant ON-Time Control with 100ns Load Step
Response
z Frequency Selectable via TON Setting
z RDS(ON) Current Sensing and Programmable Current
Limit
z Selectable PWM, DEM or Ultrasonic Mode
z Internal Soft-Start with 5 Steps Current Limiting and
Soft-Discharge
z High Efficiency Up to 97%
z 5mW Quiescent Power Dissipation
Thermal Shutdownzhttp://www.DataSheet4U.net/
z RoHS Compliant and Halogen Free
Ordering Information
RT8206
Package Type
QW : WQFN-32L 5x5 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
A : With SECFB
B : Without SECFB
Richtek Green products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
DS8206A/B-04 March 2011
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
RT8206A/B
Functional Pin Description
REF (Pin 1)
2V Reference Output. Bypass to GND with a 0.22uF
capacitor. REF can source up to 50uA for external loads.
Loading REF degrades FBx and output accuracy according
to the REF load-regulation error.
TON (Pin 2)
Frequency Select Input. (VOUT1/VOUT2 switching
frequency, respectively) :
TON = VCC, (200kHz / 250kHz)
TON = REF, (300kHz / 375kHz)
TON = GND, (400kHz / 500kHz)
VCC (Pin 3)
Analog Supply Voltage Input for the PWM Core. Bypass
to GND with a 1uF ceramic capacitor
ENLDO (Pin 4)
LDO Enable Input. The REF/LDO is enabled if ENLDO is
within logic high level and disable if ENLDO is less than
the logic low level.
NC (Pin 5, 8)
No Internal Connection.
VIN (Pin 6)
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 1uF capacitor.
LDO (Pin 7)
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 4.7uF ceramic.
BYP (Pin 9)
BYP is the switchover source voltage input for the LDO.
DS8206A/B-04 March 2011
VOUT1 (Pin 10)
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 (Pin 11)
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 (Pin 12)
SMPS1 Current-Limit Adjustment. The GND − PHASE1
current-limit threshold is 1/10th the voltage seen at ILIM1
over a 0.5V to 2V range. There is an internal 5uA current
source from VCC to ILIM1. The logic current limit threshold
is default to 100mV if ILIM1 is higher than (VCC − 1V).
PGOOD1 (Pin 13)
SMPS1 Power-Good Open-Drain Output. PGOOD1 is low
when the SMPS1 output voltage is more than 7.5% below
http://www.DataSheet4U.net/
the normal regulation point or during soft-start. PGOOD1
is high impedance when the output is in regulation and
the soft-start circuit has terminated. PGOOD1 is low in
shutdown.
EN1 (Pin 14)
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,
the SMPS1 starts after the SMPS2 reaches regulation
(delay start). Drive EN1 below 0.8V to clear fault level and
reset the fault latches.
UGATE1 (Pin 15)
High-Side MOSFET Floating Gate-Driver Output for
SMPS1. UGATE1 swings between PHASE1 and BOOT1.
PHASE1 (Pin 16)
Inductor Connection for SMPS1. PHASE1 is the internal
lower supply rail for the UGATE1 high-side gate driver.
PHASE1 is the current-sense input for the SMPS1.
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
RT8206A/B
Parameter
SKIP Input Voltage
TON Setting Voltage
ENx Input Voltage
ENLDO Input Voltage
Input Leakage Current
Symbol
Test Conditions
Low Level (DEM)
REF Level (Ultrasonic Mode)
High Level (PWM Mode)
VOUT1 / VOUT2 (400kHz / 500kHz)
VOUT1 / VOUT2 (300kHz / 375kHz)
VOUT1 / VOUT2 (200kHz / 250kHz)
Clear Fault Level / SMPS Off Level
Delay Start
SMPS On Level
VE NLD O
Rising Edge
Falling Edge
ENLDO = 0V or 25V
ENx = 0V or 5V
TON, SKIP = 0V or 5V
FBx = 0V or 5V
SECFB = 0V or 5V (RT8206A)
Internal BOOT Switch
Internal Boost Charging
Switch On-Resistance
PVCC to BOOTx
Power MOSFET Drivers
UGATEx Driver Sink/Source
Current
LGATEx Driver Source
Current
LGATEx Driver Sink Current
UGATEx On-Resistance
LGATEx On-Resistance
Dead Time
http://www.DataSheet4U.net/
UGATEx Forced to 2V
LGATEx Forced to 2V
LGATEx Forced to 2V
BOOTx to PHASEx Forced to 5V
LGATEx, High State
LGATEx, Low State
LG Rising
UG Rising
Min Typ Max Unit
-- -- 0.8
1.8 -- 2.3 V
2.5 --
--
-- -- 0.8
1.8 -- 2.3 V
2.5 --
--
-- -- 0.8
1.8 -- 2.3 V
2.5 --
--
1.2 1.6 2.0
0.94 1 1.06
V
−1 -- +3
−1 -- +1
−1 -- +1 μA
−1 -- +1
−1 -- +1
-- 20 -- Ω
-- 2 -- A
-- 1.7 --
A
-- 3.3 --
A
-- 1.5 4
Ω
-- 2.2 5
Ω
-- 0.6 1.5
-- 30 --
ns
-- 40 --
Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Note 2. θJA is measured in the natural convection at TA = 25°C on a high effective four layers thermal conductivity test board of
JEDEC 51-7 thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. PVIN + PPVCC
DS8206A/B-04 March 2011
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet RT8206A.PDF ] | |
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