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PDF RT8206L Data sheet ( Hoja de datos )
| Número de pieza | RT8206L | |
| Descripción | (RT8206L/M) Main Power Supply Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8206L/M
High Efficiency, Main Power Supply Controller
for Notebook Computers
General Description
Features
The RT8206L/M dual step-down, Switch-Mode Power-
Supply (SMPS) controller generates logic-supply voltages
in battery-powered systems. The RT8206L/M 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 (RT8206L).
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 RT8206L/M 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 RT8206L/M is available in a WQFN-32L 5x5 package.
Ordering Information
RT8206
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 (RT8206L)
z Independent Enable and Power Good
z 5V Fixed LDO Output : 70mA
z 2V Reference Voltage ±1% : 50μA
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 4700ppm/°C RDS(ON) Current Sensing
z Selectable PWM, DEM or Ultrasonic Mode
z Internal Soft-Start with Current Limiting and Soft-
Discharge
z High Efficiency Up to 97%
5mW Quiescent Power Dissipationzhttp://www.DataSheet4U.net/
z Thermal Shutdown
z RoHS Compliant and Halogen Free
Applications
z Notebook and Sub-Notebook Computers
z 3-Cell and 4-Cell Li+ Battery-Powered Devices
Package Type
QW : WQFN-32L 5x5 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
L : With SECFB
M : Without SECFB
Note :
Richtek 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.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8206L/M-07 June 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Function Block Diagram
TON SKIP
BOOT1
UGATE1
PHASE1
LGATE1
PGND
VOUT1
FB1
ILIM1
PGOOD1
GND
BYP
LDO
VIN
PVCC
SMPS1
PWM Buck
Controller
SW Threshold
Internal
Logic
LDO
Thermal
Shutdown
SMPS2
PWM Buck
Controller
PVCC
Power-On
Sequence
Clear Fault Latch
REF
TON VIN
Function Block Diagram
RT8206L/M
BOOT2
UGATE2
PHASE2
LGATE2
VOUT2
FB2
ILIM2
PGOOD2
VCC
PVCC
ENLDO
EN1
EN2
REF
VOUT
REF
FB
PGOOD
On-Time
Compute
+
-
+-
Q
TON 1-Shot R
TRIG
- Comp
+
http://www.DataSheet4U.net/
TOFF
TRIG 1-Shot
Q
1.1 x VREF
0.55 x VREF
0.9 x VREF
Over-Voltage
+ Fault
- Latch
- Blanking
+ Time
Under-Voltage
-
+
SS
Time
Current
Limit
+
-
25kHz
Detector Zero
Detector
+
-
VCC
+
-
UGATE
LGATE
ILIM
PHASE
SKIP
PWM Controller (One Side)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8206L/M-07 June 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
RT8206L/M
Parameter
ILIM Current Temperature
Coefficient
ILIM Adjustment Range
Current-Limit Threshold
Zero-Current Threshold
Symbol
Test Conditions
On the basis of 25°C
VILIMx = ILIMx × RILIMx
VILIMx = 0.5V
GND − PHASEx VILIMx = 1V
VILIMx = 2V
SKIP = GND or REF, GND − PHASEx
Internal Regulator and Reference
LDO Output Voltage
VLDO
LDO Output Current
ILDO
LDO Short-Circuit Current
LDO 5V Switchover
Threshold to BYP
VBYP
LDO Switchover Equivalent
Resistance
RSW
REF Output Voltage
VREF
REF Load Regulation
REF Sink Current
BYP = GND, 6V < VIN < 25V,
0 < ILDO < 70mA
BYP = GND, VIN = 6V to 25V
LDO = GND, BYP = GND
Falling Edge, Rising Edge with FB1
Regulation Point
LDO to BYP, 10mA
No External Load
IREF = 0 to 50μA
REF in Regulation
UVLO
PVCC UVLO Threshold
VUVLO
Rising Edge
Falling Edge
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Power Good
PGOODx Threshold
PGOOD Detect, FBx Falling edge
PGOODx Hysteresis
PGOODx Propagation
Delay
PGOODx Leakage Current
PGOODx Output Low
Voltage
Rising Edge with Soft-Start Delay Time
Falling Edge
High State, Forced to 5.5V
ISINK = 4mA
Fault Detection
OVP Trip Threshold
OVP Propagation Delay
VFB_OVP OVP Detect, FBx Rising edge
FBx with 50mV Overdrive
UVP Trip Threshold
UVP Shutdown Blanking
Time
Thermal Shutdown
Thermal Shutdown
Thermal Shutdown
Hysteresis
UVP Detect, FBx Falling edge
tSHDN_UVP From ENx Enable
TSHDN
ΔTSHDN
Min
--
0.5
40
85
180
--
4.9
70
--
4.53
--
1.98
--
10
--
3.9
86
--
--
--
--
108
--
50
--
--
--
Typ
4700
--
50
100
200
3
5
--
200
4.66
1.5
2
10
--
4.35
4.05
90
3
10
--
--
112
10
55
5
150
10
Max Unit
-- ppm/°C
2V
60
115 mV
220
-- mV
5.1
--
300
4.79
3
2.02
--
--
V
mA
mA
V
Ω
V
mV
μA
4.5
V
4.2
94 %
-- %
-- μs
1 μA
0.3 V
116 %
-- μs
60 %
-- ms
-- °C
-- °C
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8206L/M-07 June 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet RT8206L.PDF ] | |
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