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PDF RT8249D Data sheet ( Hoja de datos )
| Número de pieza | RT8249D | |
| Descripción | Dual-Channel Synchronous DC/DC Step-Down Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8249D (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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®
RT8249D
Dual-Channel Synchronous DC/DC Step-Down Controller
with 5V/3.3V LDOs
General Description
The RT8249D is a dual-channel step-down, controller
generating supply voltages for battery-powered systems.
It includes two Pulse-Width Modulation (PWM) controllers
adjustable from 2V to 5.5V, and two fixed 5V/3.3V linear
regulators. Each linear regulator provides up to 100mA
output current and 3.3V linear regulator provides 1%
accuracy under 35mA. The RT8249D provides a mode
selection pin, SKIPSEL, to select Diode-Emulation Mode
(DEM) or Audio Skipping Mode (ASM). Other features
include on-board power-up sequencing, a power-good
output, internal soft-start, and soft-discharge output that
prevents negative voltage during shutdown.
A constant current ripple PWM control scheme operates
without sense resistors and provides 100ns response to
load transient. For maximizing power efficiency, the
RT8249D automatically switches to the diode-emulation
mode in light load applications. The RT8249D is available
in the WQFN-20L 3x3 package.
Features
Support Connected Standby Mode for Ultrabook
CCRCOT Control with 100ns Load Step Response
PWM Maximum Duty Ratio > 98%
5V to 25V Input Voltage Range
Dual Adjustable Output :
CH1 : 2V to 5.5V
CH2 : 2V to 4V
5V/3.3V LDOs with 100mA Output Current
1% Accuracy on 3.3V LDO Output
Oscillator Driving Output for Charge Pump
Application
Internal Frequency Setting
500kHz/600kHz (CH1/CH2)
Internal Soft-Start and Soft-Discharge
4700ppm/°C RDS(ON) Current Sensing
Independent Switcher Enable Control
Built in OVP/UVP/OCP/OTP
Non-latch UVLO
Power Good Indicator
20-Lead WQFN Package
RoHS Compliant and Halogen Free
Simplified Application Circuit
VIN
VOUT1
VIN UGATE2
RT8249D
BOOT2
UGATE1
BOOT1
PHASE2
LGATE2
PHASE1
LGATE1
FB2
CS1
BYP1
CS2
FB1
Channel 1 Enable
EN1
Channel 2 Enable
On
Off
EN2
LDO5
PGOOD
LDO3
GND
VOUT2
5V
PGOOD Indicator
3.3V
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS8249D-00 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8249D
Absolute Maximum Ratings (Note 1)
VIN to GND ----------------------------------------------------------------------------------------------------------------- −0.3V to 30V
BOOTx to GND
DC ---------------------------------------------------------------------------------------------------------------------------- −0.3V to 36V
<100ns ---------------------------------------------------------------------------------------------------------------------- −5V to 42V
BOOTx to PHASEx
DC ---------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
<100ns ---------------------------------------------------------------------------------------------------------------------- −5V to 7.5V
PHASEx to GND
DC ---------------------------------------------------------------------------------------------------------------------------- −5V to 30V
<100ns ---------------------------------------------------------------------------------------------------------------------- −10V to 42V
UGATEx to GND
DC ---------------------------------------------------------------------------------------------------------------------------- −5V to 36V
<100ns ---------------------------------------------------------------------------------------------------------------------- −10V to 42V
UGATEx to PHASEx
DC ---------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
<100ns ---------------------------------------------------------------------------------------------------------------------- −5V to 7.5V
LGATEx to GND
DC ---------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
<100ns ---------------------------------------------------------------------------------------------------------------------- −5V to 7.5V
Other Pins ------------------------------------------------------------------------------------------------------------------ −0.3V to 6.5V
Power Dissipation, PD @ TA = 25°C
WQFN-20L 3x3 ----------------------------------------------------------------------------------------------------------- 3.33W
Package Thermal Resistance (Note 2)
WQFN-20L 3x3, θJA ------------------------------------------------------------------------------------------------------ 30°C/W
WQFN-20L 3x3, θJC ----------------------------------------------------------------------------------------------------- 7.5°C/W
Junction Temperature ---------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------ 260°C
Storage Temperature Range ------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) --------------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 4)
Supply Voltage, VIN ----------------------------------------------------------------------------------------------------- 5V to 25V
Junction Temperature Range ------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------------- −40°C to 85°C
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS8249D-00 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8249D
Output Voltage 1 vs. Output Current
5.01
5.00
4.99
4.98
4.97
VIN = 7.4V
VIN = 11.1V
VIN = 14.8V
VIN = 20.5V
4.96
4.95
0.001
DEM, EN1 = LDO3, EN2 = 0V, BYP1 on
0.01 0.1
1
Output Current (A)
10
5.020
VLDO5 vs. ILDO5
5.018
5.016
5.014
5.012
5.010
5.008
5.006
5.004
5.002
5.000
0
DEM, VIN = 12V, EN1 = LDO3, EN2 = 0V, BYP1 off
10 20 30 40 50 60 70 80 90 100
ILDO5 (mA)
Quiescent Current vs. Input Voltage
30
25
20
15
10
5
DEM, EN1 = EN2 = LDO3, BYP1 on
0
5 7 9 11 13 15 17 19 21 23 25
Input Voltage (V)
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS8249D-00 May 2016
Output Voltage 2 vs. Output Current
3.32
3.31
3.30
VIN = 7.4V
VIN = 11.1V
VIN = 14.8V
VIN = 20.5V
3.29
0.001
DEM, EN1 = 0V, EN2 = LDO3, BYP1 on
0.01 0.1
1
Output Current (A)
10
3.300
VLDO3 vs. ILDO3
3.298
3.296
3.294
3.292
3.290
3.288
3.286
3.284
3.282
3.280
0
DEM, VIN = 12V, EN1 = 0V , EN2 = LDO3, BYP1 off
10 20 30 40 50 60 70 80 90 100
ILDO3 (mA)
BYP1 Supply Current vs. Input Voltage
160
150
140
130
120
110
DEM, EN1 = EN2 = LDO3, BYP1 on
100
5 7 9 11 13 15 17 19 21 23 25
Input Voltage (V)
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet RT8249D.PDF ] | |
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