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RT8228AZQW

P1-P3P4-P6P7-P9P10-P12P13-P15
RT8228A
4
RT8228A-06 January 2014www.richtek.com
©
Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Recommended Operating Conditions (Note 4)
z Input Voltage, V
IN
---------------------------------------------------------------------------------------------------4.5V to 26V
z Control Voltage, V
CC
-----------------------------------------------------------------------------------------------4.5V to 5.5V
z Junction Temperature Range-------------------------------------------------------------------------------------−40°C to 125°C
z Ambient Temperature Range-------------------------------------------------------------------------------------−40°C to 85°C
Absolute Maximum Ratings (Note 1)
z VCC to GND ---------------------------------------------------------------------------------------------------------–0.3V to 6V
z FB, PGOOD, EN, CS, MODE to GND ------------------------------------------------------------------------–0.3V to (VCC + 0.3V)
z TON to GND----------------------------------------------------------------------------------------------------------–0.3V to 32V
z BOOT to PHASE ---------------------------------------------------------------------------------------------------–0.3V to 6.5V
z PHASE to GND
DC----------------------------------------------------------------------------------------------------------------------−0.3V to 32V
< 20ns ----------------------------------------------------------------------------------------------------------------−8V to 38V
z UGATE to PHASE
DC----------------------------------------------------------------------------------------------------------------------−0.3V to (VCC + 0.3V)
< 20ns ----------------------------------------------------------------------------------------------------------------−5V to 7.5V
z LGATE to GND
DC----------------------------------------------------------------------------------------------------------------------−0.3V to (VCC + 0.3V)
< 20ns ----------------------------------------------------------------------------------------------------------------−2.5V to 7.5V
z Power Dissipation, P
D
@ T
A
= 25°C
WQFN-12L 2x2 -----------------------------------------------------------------------------------------------------0.606W
z Package Thermal Resistance (Note 2)
WQFN-12L 2x2, θ
JA
------------------------------------------------------------------------------------------------165°C/W
z Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------260°C
z Junction Temperature ----------------------------------------------------------------------------------------------150°C
z Storage Temperature Range -------------------------------------------------------------------------------------−65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------2kV
MM (Machine Mode) -----------------------------------------------------------------------------------------------200V
RT8228A
5
RT8228A-06 January 2014 www.richtek.com
©
Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
(V
CC
= 5V, V
IN
= 15V, V
EN
= 5V, V
MODE
= 5V, R
TON
= 500kΩ, T
A
= 25°C, unless otherwise specified)
Electrical Characteristics
Parameter Symbol Test Conditions Min Typ Max Unit
PWM Controller
V
CC
Quiescent Supply Current I
Q
FB forced above the regulation
point, V
EN
= 5V
-- 0.5 1.25 mA
V
CC
Shutdown Current I
SHDN
V
CC
Current, V
EN
= 0V
-- -- 1
μA
TON Operating Current
R
TON
= 500k
-- 30 --
μA
TON Shutdown Current R
TON
= 500k -- -- 1 μA
CS Shutdown Current CS pull to GND -- -- 1 μA
FB Error Comparator
Threshold Voltage
V
CC
= 4.5V to 5.5V, DEM
495 500 505 mV
FB Input Bias Current V
FB
= 0.5V −1 0.1 1 μA
Output Voltage Range 0.5 -- 3.3 V
On-Time
V
IN
=15V, V
PHASE
= 1.25V,
V
MODE
= 0V
267 334 401 ns
Minimum Off-Time
V
MODE
= 0V, FB = 0.45V
250 400 550 ns
Current Sensing Threshold
CS Source Current V
CS
= 0.5V to 2V 9 10 11 μA
CS Source Current TC On the basis of 25°C -- 4700 -- ppm/°C
Zero Crossing Threshold V
MODE
> 1.8V, PHASE − GND −10 -- 5 mV
ASM Min Frequency
V
MODE
=
2.5V
-- 25 -- kHz
Protection Function
Current Limit Threshold GND − PHASE, V
CS
= 1V 85 100 115 mV
UV Threshold UVP Detect, FB Falling Edge 60 70 80 %
OVP Threshold OVP Detect, FB Rising Edge 120 125 130 %
OV Fault Delay FB forced above OV threshold -- 5 -- μs
V
CC
Power On Reset (POR)
Threshold
Rising Edge 3.7 3.9 4.2 V
POR Threshold Hysteresis -- 100 -- mV
Current Limit Ramp at
Soft-Start
Enable to current limit threshold =
50mV
-- 900 -- μs
UV Blank Time From EN signal going high -- 4.5 -- ms
Thermal Shutdown
T
SD
-- 150 -- °C
Thermal Shutdown Hysteresis
ΔT
SD
-- 10 -- °C
Driver On-Resistance
UGATE Driver Source
R
UGATEsr
BOOT − PHASE forced to 5V,
UGATE High State
-- 2.5 5
Ω
UGATE Driver Sink RUGATEsk
BOOT − PHASE forced to 5V,
UGATE Low State
-- 1.5 3 Ω
LGATE Driver Source RLGATEsr LGATE High State -- 2.5 5 Ω
LGATE Driver Sink RLGATEsk LGATE Low State -- 0.8 1.5 Ω
LGATE Rising (Phase = 1.5V) -- 30 --
Dead Time
UGATE Rising -- 30 --
ns
RT8228A
6
RT8228A-06 January 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
Internal Boost Charging
Switch on Resistance
V
CC
to BOOT, 10mA
-- -- 80
Ω
EN Threshold
Logic-High V
IH
1.2 -- --
EN Threshold
Voltage
Logic-Low V
IL
-- -- 0.4
V
Mode Threshold
DEM Threshold
V
CC
− 0.5
-- -- V
ASM Threshold 1.8 -- 2.9 V
FCCM Threshold -- -- 0.4 V
PGOOD (upper side threshold decided by OV threshold)
Trip Threshold (Falling)
Measured at FB, with respect to
reference
−13 −10 −7
%
Trip Threshold Hysteresis -- 3 -- %
Fault Propagation Delay
Falling edge, FB forced below
PGOOD trip threshold
-- 2.5 -- μs
Output Low Voltage
I
SINK
= 1mA
-- -- 0.4 V
Leakage Current High state, forced to 5V -- -- 1
μA
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings, Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective thermal conductivity test board of JEDEC 51-
3 thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
P1-P3P4-P6P7-P9P10-P12P13-P15

RT8228AZQW

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IC REG CTRLR BUCK 12WQFN
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