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RT8249 Datasheet(PDF) 8 Page - Richtek Technology Corporation

Part # RT8249
Description  Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.3V LDOs
PDF  23 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8249 Datasheet(HTML) 8 Page - Richtek Technology Corporation

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RT8249A/B/C
8
DS8249A/B/C-02
June 2014
www.richtek.com
©
Copyright
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
SKIP Mode Selection, RT8249C
SKIPSEL Input Voltage
VSKIPSEL
ASM Operation
--
--
0.8
V
DEM Operation
1.2
--
--
UVLO
LDO5 UVLO Threshold
VUVLO5
Rising Edge
--
4.3
4.6
V
Falling Edge
3.7
3.9
4.1
LDO3 UVLO Threshold
VUVLO3
Channel x Off
--
2.5
--
V
Power Good
PGOOD Threshold
VPGxTH
PGOOD Detect, VFBx Rising Edge
84
88
92
%
Hysteresis
--
8
--
PGOOD Leakage Current
High state, VPGOOD = 5.5V
--
--
1
A
PGOOD Output Low
Voltage
ISINK = 4mA
--
--
0.3
V
Fault Detection
OVP Trip Threshold
VOVP
FBx with Respect to Internal Reference
109
113
117
%
OVP Propagation Delay
--
1
--
s
UVP Trip Threshold
VUVP
UVP Detect, FBx Falling Edge
47
52
57
%
UVP Shutdown Blanking
Time
tSHDN_UVP
From ENx Enable
--
1.3
--
ms
Thermal Shutdown
Thermal Shutdown
Threshold
TSD
--
150
--
°C
Logic Inputs
ENx Threshold Voltage
VENx_H
SMPS On
1.6
--
--
V
VENx_L
SMPS Off
--
--
0.4
Internal Boost Switch
Internal Boost Switch
On-Resistance
RBST
LDO5 to BOOTx
--
80
--
Power MOSFET Drivers
UGATEx On-Resistance
RUG
High State, VBOOTx  VUGATEx = 0.25V,
VBOOTx  VPHASEx = 5V
--
3
--
Low State, VUGATEx  VPAHSEx = 0.25V,
VBOOTx  VPHASEx = 5V
--
2
--
LGATEx On-Resistance
RLG
High State, VLDO5  VLGATEx = 0.25V,
VLDO5 = 5V
--
3
--
Low State, VLGATEx  GND = 0.25V
--
1
--
Dead-Time
td
LGATEx Rising
--
20
--
ns
UGATEx Rising
--
30
--



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