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RT8243BZQW

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
RT8243A/B/C
7
DS8243A/B/C-07 November 2014 www.richtek.com
©
Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- 5.5V to 25V
Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Absolute Maximum Ratings (Note 1)
VIN, ENLDO to GND ------------------------------------------------------------------------------------------------------ −0.3V to 30V
BOOTx to PHASEx
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
< 20ns ----------------------------------------------------------------------------------------------------------------------- −2.5V to 6.3V
ENTRIPx, FBx, TON, BYP1, PGOOD, LDO5, LDO3, ENM/SECFB to GND ------------------------------- −0.3V to 6V
PHASEx to GND
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 30V
< 20ns ----------------------------------------------------------------------------------------------------------------------- −8V to 38V
UGATEx to PHASEx
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
< 20ns ----------------------------------------------------------------------------------------------------------------------- −5V to 7.5V
LGATEx to GND
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
< 20ns ----------------------------------------------------------------------------------------------------------------------- −2.5V to 7.5V
Power Dissipation, P
D
@ T
A
= 25°C
WQFN-20L 3x3 ------------------------------------------------------------------------------------------------------------ 3.33W
Package Thermal Resistance (Note 2)
WQFN-20L 3x3, θ
JA
------------------------------------------------------------------------------------------------------- 30°C/W
WQFN-20L 3x3, θ
JC
------------------------------------------------------------------------------------------------------ 7.5°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
RT8243A/B/C
8
DS8243A/B/C-07 November 2014www.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
Input Supply
VIN Power On Reset
Rising Threshold -- 5.1 5.5
V
Falling Threshold 3.5 -- 4.5
VIN Shutdown Current
I
VIN_SHDN
V
ENLDO
= GND
-- 20 40
A
VIN Standby Supply
Current
I
VIN_SBY
Both SMPS Off -- 250 350
Quiescent Power
Consumption
I
Q
Both SMPSs on, FBx = 2.1V,
BYP1 = 5V, ENM = 3.3V (RT8243A)
-- 5 7 mW
SMPS Output and FB Voltage
FBx Regulation Voltage
V
FBx
FBx, CCM Operation -- 2 --
V
FBx, DEM Operation 1.98 2.006 2.03
Output Voltage
Adjustable Range
SMPS1, SMPS2 2 -- 5.5
V
SECFB Voltage
V
SECFB
RT8243B 1.92 2 2.08
On Time
ON-Time Pulse Width
t
UGATEx
V
IN
= 20V
R
TON
= 56k
V
PHASE1
= 2V
-- 256 --
ns
V
PHASE2
= 2V
-- 220 --
Minimum Off-Time
t
LGATEx
V
FBx
= 1.8V
-- -- 400 ns
Frequency Range
f
SMPS1
SMPS1 Operating Frequency 200 -- 400
kHz
f
SMPS2
SMPS2 Operating Frequency 233 -- 466
Ultrasonic Mode
Frequency
f
ASM
RT8243C, V
PHASEx
= 50mV
25 -- -- kHz
Soft-Start
Soft-Start Time
t
SSx
Zero to 200mV Current Limit Threshold
from ENTRIPx Enable
-- 2 -- ms
Current Sense
Current Limit Current
Source
I
ENTRIPx
V
ENTRIPx
= 0.9V
9.4 10 10.6
A
Temperature Coefficient
of I
ENTRIPx
On The Basis of 25C
-- 4700 --
ppm/C
Current Limit Adjustment
Range
V
ENTRIPx
= I
ENTRIPx
x R
ENTRIPx
0.5 -- 2.7 V
Current Limit Threshold
V
ENTRIPx
GND PHASEx, V
ENTRIPx
= 2V
180 200 225 mV
Zero-Current Threshold
V
ZC
GND PHASEx, FBx = 2.1V
-- 3 -- mV
Internal Regulator and Reference
LDO5 Output Voltage
V
LDO5
V
BYP1
= 0V, I
LDO5
< 100mA
4.9 5 5.1
V
V
BYP1
= 0V, I
LDO5
< 100mA ,
6.5V < V
IN
< 25V
4.75 -- 5.25
V
BYP1
= 0V, I
LDO5
< 50mA,
5.5V < V
IN
< 25V
4.75 -- 5.25
(V
IN
= 12V, V
ENLDO
= 5V, V
ENTRIPx
= 2V, V
BYP1
= 5V, No Load on LDO5, LDO3, T
A
= 25°C, unless otherwise specified)
Electrical Characteristics
RT8243A/B/C
9
DS8243A/B/C-07 November 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
LDO5 Output Current I
SHORT5
V
BYP1
= 0V, V
LDO5
= 4.5V 150 225 300 mA
5V Switchover Threshold V
BYP1TH
Falling Edge, Rising Edge with FB1
Regulation Point
4.53 4.66 4.79 V
5V Switch R
DS(ON)
R
BYPSW
V
BYP1
= 5V, I
LDO5
= 50mA -- 1.5 3
LDO3 Output Voltage V
LDO3
V
BYP1
= 0V, I
LDO3
< 100mA 3.234 3.3 3.366
V
V
BYP1
= 5V, I
LDO3
< 100mA 3.2 3.3 3.46
LDO3 Output Current I
SHORT3
V
BYP1
= 0V, V
LDO3
= 2.9V 80 150 260 mA
UVLO
LDO5 UVLO Threshold V
UVLO5
Rising Edge -- 4.35 4.5
V
Falling Edge 3.9 4.05 4.2
LDO3 UVLO Threshold V
UVLO3
Both SMPS Off 1.9 2.2 2.5
Power Good
PGOOD Threshold V
PGOOD
PGOOD Detect, Rising edge with
soft-start delay time. Hysteresis = 2.5%
14 10 6 %
PGOOD Propagation
Delay
t
PD_PGOOD
Falling Edge -- 5 -- s
PGOOD Leakage Current I
LK_PGOOD
High State, Forced to 5.5V -- -- 1 A
PGOOD Output Low
Voltage
V
SINK_PGOOD
I
SINK
= 4mA -- -- 0.4 V
SECFB Power Good
Threshold
V
SFB_PGOOD
SECFB with Respect to 2V
(RT8243B/C)
40 50 60 %
Fault Detection
Over Voltage Protection
Trip Threshold
V
OVP
OVP Detect, FBx Rising Edge 108 112 116 %
Over Voltage Protection
Propagation Delay
t
DLY_OVP
Rising Edge -- 5 -- s
Under Voltage Protection
Trip Threshold
V
UVP
UVP Detect, FBx Falling Edge. 53 58 63 %
V
SFB_UVP
UVP Detect, SECFB Falling Edge. 0.8 -- 1.2 V
Under Voltage Protection
Shutdown Blanking Time
t
SSHx
From ENTRIPx or ENM Enable -- 5 -- ms
Thermal Shutdown
Thermal Shutdown T
SD
-- 150 -- °C
Thermal Shutdown
Hysteresis
T
SD
-- 10 -- °C
Logic Input
ENTRIPx Input Voltage V
ENTRIPx
Clear Fault Level/SMPSx Off Level 4.5 -- -- V
ENLDO Input Voltage V
ENLDO
Rising Edge Threshold 1.2 1.6 2
V
Falling Edge Threshold 0.9 0.95 1
When ENLDO is Floating (Default
Enable)
2.1 -- --
ENM Input Voltage
(RT8243A)
V
ENM
Clear Fault Level/SMPSs Off Level -- -- 0.8
V
SMPSs On, DEM Operation 2.3 -- 3.6
SMPSs On, Ultrasonic Mode Operation 4.5 -- --
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

RT8243BZQW

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IC REG CTRLR NOTEBK 2OUT 20WQFN
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