RT8206B 반도체 회로 부품 판매점
(RT8206A/B) Main Power Supply Controllers
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 Richtek |
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/
RT8206A/B
Pin Configurations
(TOP VIEW)
REF
TON
VCC
ENLDO
NC
VIN
LDO
NC
32 31 30 29 28 27 26 25
1 24 BOOT2
2 23 LGATE2
3 22 PGND
4
5
GND
21 GND
20 SECFB
6 19 PVCC
7 33 18 LGATE1
8 17 BOOT1
9 10 11 12 13 14 15 16
REF
TON
VCC
ENLDO
NC
VIN
LDO
NC
32 31 30 29 28 27 26 25
1 24 BOOT2
2 23 LGATE2
3 22 PGND
4
5
GND
21 GND
20 NC
6 19 PVCC
7 33 18 LGATE1
8 17 BOOT1
9 10 11 12 13 14 15 16
WQFN-32L 5x5
RT8206A
WQFN-32L 5x5
RT8206B
Typical Application Circuit
VOUT1
5V
C3
220µF
C1
10µF
L1
6.8µH
R5
C4
C6
0.1µF
D2
C8
0.1µF
D4
CP
R14
3.9
C18
0.1µF
6 VIN
RT8206A/B
UGATE2 26
BOOT2 24
R9
0
R8 0
Q2
Q1
R4 0
R3 0
15 UGATE1
17 BOOT1
http://www.DataSheet4U.net/
PHASE2 25
LGATE2 23
C11
0.1µF
Q4
C2
0.1µF
Q3
D1
C5
0.1µF
16 PHASE1
18 LGATE1
9 BYP
10 VOUT1
PGND 22
VOUT2 30
REF 1
PGOOD1 13
PGOOD2 28
C15
0.22µF
R6
100k
R13
100k
D3
C7
0.1µF
3 VCC
C9
1µF
R11
200k
C19
R7 0
C10
4.7µF
R12
39k
C16
1µF
20 SECFB/NC
11 FB1
32 FB2
19 PVCC
7 LDO
EN1 14 5V Enable
EN2 27 3.3V Enable
ENLDO 4
ILIM1 12
ILIM2 31
LDO Control
R1
180k
R2
180k
TON 2
SKIP 29
Frequency Control
PWM/DEM/Ultrasonic
GND 21, Exposed Pad (33)
C13
10µF
C12
10µF
VIN
6V to 25V
L2
4.7µH
R10
C14
VOUT2
3.3V
C17
220µF
PVCC
PVCC
ON
OFF
VIN
www.richtek.com
2
Figure 1. Fixed Voltage Regulator
DS8206A/B-04 March 2011
datasheet pdf - http://www.DataSheet4U.net/
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RT8206B controller
데이터시트 다운로드 :
[ RT8206B.PDF ]
[ RT8206B 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
관련 데이터시트
RT8206A
(RT8206A/B) Main Power Supply Controllers - Richtek
RT8206B
(RT8206A/B) Main Power Supply Controllers - Richtek
RT8206L
(RT8206L/M) Main Power Supply Controller - Richtek
RT8206M
(RT8206L/M) Main Power Supply Controller - Richtek