RT8272 RICHTEK [Richtek Technology Corporation], RT8272 Datasheet - Page 4

• Manufacturer Part Number: RT8272
• Description: 3A, 24V, 1.2MHz Step-Down Converter
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT8272
Electrical Characteristics
(V
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
Note 2. θ
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
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4
Feedback Reference Voltage
High Side Switch-On Resistance
Low Side Switch-On Resistance
Switch Leakage
Current Limit
Current Sense Transconductance
Error Amplifier Tansconductance
Oscillator Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On-Time
Under Voltage Lockout Threshold
Rising
Under Voltage Lockout Threshold
Hysteresis
En input Low Voltage
En input High Voltage
Enable Pull Up Current
Shutdown Current
Quiescent Current
Soft-Start Current
Soft-Start Period
Thermal Shutdown
IN
= 12V, T
JEDEC 51-7 thermal measurement standard.
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.
JA
is measured in the natural convection at T
A
Parameter
= 25°C unless otherwise specified)
I
I
I
T
V
R
R
I
G
G
f
D
t
SHDN
Q
SS
LIM
SW
ON
SD
FB
DS(ON)1
DS(ON)2
MAX
CS
m
Symbol
A
= 25°C on a high effective four layers thermal conductivity test board of
V
V
C
4.75V ≤ V
V
Duty = 80%; V
Output Current to V
ΔI
V
V
EN
EN
SS
EN
FB
FB
C
= ±10μA
= 0V
= 0.8V
= 0V
= 2V, V
= 0.1μF
= 0V, V
Test Conditions
IN
FB
SW
≤ 24V
BOOT−SW
= 1V
= 0V
COMP
= 4.8V
0.902
0.15
Min
500
3.8
1.4
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DS8272-02 March 2011
0.92
Typ
680
440
300
150
0.1
4.1
1.2
4.2
0.8
10
10
80
90
25
10
--
--
--
4
1
0.938
Max
0.16
2.65
900
4.5
0.4
10
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1
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μA/V
MHz
Unit
kHz
A/V
mV
mA
ms
μA
μA
μA
μA
°C
ns
%
Ω
Ω
V
A
V
V
V