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PDF RT8205A Data sheet ( Hoja de datos )
| Número de pieza | RT8205A | |
| Descripción | (RT8205A/B/C) Main Power Supply Controllers | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8205A (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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®
RT8205A/B/C
High Efficiency, Main Power Supply Controllers
for Notebook Computers
General Description
The RT8205A/B/C dual step-down, switch-mode power-
supply controller generates logic-supply voltages in
battery-powered systems. The RT8205A/B/C includes two
pulse-width modulation (PWM) controllers fixed at 5V/
3.3V or adjustable from 2V to 5.5V. An alternative LGATE1
output LG1_CP can be used for external charge pump
(RT8205B). And an optional external charge pump can be
monitored through SECFB (RT8205C). This device also
features 2 linear regulators providing fixed 5V and 3.3V
outputs. The linear regulator each provides up to 70mA
output current with automatic linear-regulator bootstrapping
to the PWM outputs. The RT8205A/B/C includes on-board
power-up sequencing, the power-good output, internal soft-
start, and internal soft-discharge output that prevents
negative voltages on shutdown.
A constant on-time PWM control scheme operates without
sense resistor 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
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 Alternative LGATE1 Output (LG1_CP) acts as Clock
for Charge Pump (RT8205B)
z Secondary Feedback Input Maintains Charge Pump
Voltage (RT8205C)
z Fixed 3.3V and 5V LDO Output : 70mA
z 2V Reference Voltage ±1% : 50μA
z Constant ON-Time Control with 100ns Load Step
Response
z Frequency Selectable via TONSEL Setting
z RDS(ON) Current Sensing and Programmable Current
Limit combined with Enable Control
z Selectable PWM, DEM, or Ultrasonic Mode
z Internal Soft-Start 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
Applications
z Notebook and Sub-Notebook Computers
z 3-Cell and 4-Cell Li+ Battery-Powered Devices
Ordering Information
RT8205
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Pin Function
A : Default
B : With LG1_CP
C : With 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.
DS8205A/B/C-06 July 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
RT8205A/B/C
VOUT1
C3
220uF
C18
C19
0.1uF
C1
10uF
R8
3.9
C10
0.1uF
16 VIN
RT8205C
UGATE2 10
BOOT2 9
R10
0
R9 0
Q2
BSC119
N03S
C13
10uF
C12
10uF
VIN
L1
6.8uH
R5
C4
Q1
BSC119
N03S
R4 0
R3 0
C2
0.1uF
Q3
BSC119
N03S
21 UGATE1
22 BOOT1
20 PHASE1
19 LGATE1
R12
15k
R13
10k
C6
0.1uF
D1
D2
D3
C5
0.1uF
C7
0.1uF
24 VOUT1
2 FB1
3 REF
C15
0.22uF
D4
C8
0.1uF
BAT254
R6
200k
CP
ON
OFF
C18
18 SECFB
3R97k
13 EN
PHASE2 11
LGATE2 12
C11
0.1uF
L2
4.7uH
Q4
BSC119
N03S
R11
C14
VOUT2
3.3V
C17
220uF
VOUT2 7
FB2 5
ENTRIP1 1
ENTRIP2 6
GND Exposed Pad (25)
R1
150k
R2
150k
R14 C21
6.5k
C20
R15 0.1uF
10k
VREG5 17
PGOOD 23
VREG3 8
TONSEL 4
SKIPSEL 14
PGND 15
C9
4.7uF
C16
4.7uF
R6
100k
5V Always On
PGOOD Indicator
3.3V Always On
Frequency Control
PWM/DEM/Ultrasonic
http://www.DataSheet4U.net/
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8205A/B/C-06 July 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
RT8205A/B/C
Parameter
Symbol
Test Conditions
Current-Limit Threshold
Zero-Current Threshold
Internal Regulator and Reference
VREG5 Output Voltage
VVREG5
VREG3 Output Voltage
VREG5 Short Current
VVREG3
IVREG5
VENTRIPx = 0.5V
GND−PHASEx VENTRIPx =1V
VENTRIPx =2V
SKIPSEL = VREG5 or REF,
GND−PHASEx
VOUT1 = GND, 6V < VIN < 25V,
0 < IVREG5 < 70mA
VOUT2 = GND, 6V < VIN < 25V,
0 < IVREG3 < 70mA
VREG5 = GND, VOUT1 = GND
VREG3 Short Current
VREG5 Switchover Threshold
to VOUT1
VREG3 Switchover Threshold
to VOUT2
VREGx Switchover Equivalent
Resistance
REF Output Voltage
REF Load Regulation
REF Sink Current
IVREG3
RSW
VREF
VREG3 = GND, VOUT2 = GND
Rising Edge at VOUT1 Regulation
Point
Rising Edge at VOUT2 Regulation
Point
VREGx to VOUTx, 10mA
No External Load
0 < ILOAD < 50uA
REF in Regulation
UVLO
VREG3 UVLO Threshold
VREG5 UVLO Threshold
SMPSx off
http://www.DataSheet4U.net/
Rising Edge
Falling Edge
Power Good
PGOOD Threshold
PGOOD Propagation Delay
PGOOD Leakage Current
PGOOD Output Low Voltage
Fault Detection
OVP Trip Threshold
OVP Propagation Delay
UVP Trip Threshold
UVP Shutdown Blanking Time
Thermal Shutdown
Thermal Shutdown
Thermal Shutdown Hysteresis
VFB_OVP
tSHDN_UVP
TSHDN
FBx with Respect to Internal
Reference, Falling Edge,
Hysteresis = 1%
Falling Edge, 50mV Overdrive
High State, Forced to 5.5V
ISINK = 4mA
FBx with Respect to Internal
Reference
FBx with Respect to Internal
Reference
From ENTRIPx Enable
Min
40
90
180
--
4.8
3.2
--
--
4.53
2.96
--
1.98
--
5
--
--
3.9
−11
--
--
--
108
--
65
--
--
--
Typ
50
100
200
3
5
3.33
175
175
4.66
3.06
1.5
2
10
--
2.5
4.35
4.05
−7.5
10
--
--
111
10
70
3
150
10
Max
60
110
220
--
5.2
3.46
275
275
4.79
3.16
3
2.02
--
--
--
4.5
4.25
−4
--
1
0.3
115
--
75
--
--
--
Unit
mV
mV
mV
mV
V
V
mA
mA
V
V
Ω
V
mV
μA
V
V
V
%
μs
μA
V
%
μs
%
ms
°C
°C
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8205A/B/C-06 July 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet RT8205A.PDF ] | |
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