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RT8259GE

P1-P3P4-P6P7-P9P10-P12P13-P13
RT8259
4
DS8259-03 March 2011www.richtek.com
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
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 high effective four layers thermal conductivity test board of
JEDEC 51-7 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.
Parameter Symbol Test Conditions Min Typ Max Unit
Shutdown Current I
SHDN
V
EN
= 0V -- 25 -- μA
Quiescent Current I
Q
V
EN
= 2V, V
FB
= 1V (Not Switching) -- 0.55 1 mA
Thermal Shutdown T
SD
-- 150 -- °C
RT8259
5
DS8259-03 March 2011 www.richtek.com
Typical Operating Characteristics
Frequency vs. Input Voltage
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
4 6.5 9 11.51416.51921.524
Input Voltage (V)
Frequency (MHz)
V
OUT
= 3.3V, I
OUT
= 0.3A
Output Voltage vs. Load Current
3.298
3.303
3.308
3.313
3.318
3.323
3.328
3.333
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2
Load Current (A)
Output Voltage (V)
V
IN
= 12V
V
IN
= 24V
Efficiency vs. Load Current
0
10
20
30
40
50
60
70
80
90
100
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2
Load Current (A)
Efficiency (%)
V
IN
= 12V
V
IN
= 24V
V
OUT
= 3.3V
Efficiency vs. Load Current
0
10
20
30
40
50
60
70
80
90
100
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2
Load Current (A)
Efficiency (%)
V
IN
= 12V
V
IN
= 24V
V
OUT
= 5V
Frequency vs. Temperature
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
-50 -25 0 25 50 75 100 125
Temperature (°C)
Frequency (MHz) 1
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0.3A
Output Voltage vs. Temperature
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
-50 -25 0 25 50 75 100 125
Temperature (°C)
Output Voltage (V)
V
IN
= 12V
V
IN
= 24V
I
OUT
= 0A
RT8259
6
DS8259-03 March 2011www.richtek.com
Quiescent Current vs. Input Voltage
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
4 6.5 9 11.5 14 16.5 19 21.5 24
Input Voltage (V)
Quiescent Current (mA)
V
EN
= 2V, V
FB
= 1V
Quiescent Current vs. Temperature
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
-50 -25 0 25 50 75 100 125
Temperature (°C)
Quiescent Current (mA
)
V
IN
= 12V
V
IN
= 24V
V
EN
= 2V, V
FB
= 1V
Load Transient Response
Time (50μs/Div)
I
OUT
(500mA/Div)
V
OUT
(50mV/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0.6A to 1.2A
Load Transient Response
Time (50μs/Div)
I
OUT
(500mA/Div)
V
OUT
(50mV/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A to 1.2A
Time (250ns/Div)
Switching
V
PHASE
(10V/Div)
I
L
(1A/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 1.2A
V
OUT
(5mV/Div)
Switching
Time (250ns/Div)
V
PHASE
(10V/Div)
I
L
(1A/Div)
V
IN
= 20V, V
OUT
= 3.3V, I
OUT
= 1.2A
V
OUT
(5mV/Div)
P1-P3P4-P6P7-P9P10-P12P13-P13

RT8259GE

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IC REG BUCK ADJ 1.2A SOT23-6
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