RT8251GSP Richtek USA Inc, RT8251GSP Datasheet - Page 5

• Manufacturer Part Number: RT8251GSP
• Description: IC DCDC CTRLR STP-DN 8SOP
• Manufacturer: Richtek USA Inc
• Type: Step-Down (Buck)r

Specifications of RT8251GSP

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 V ~ 15 V
• Current - Output: 5A
• Frequency - Switching: 570kHz
• Voltage - Input: 4.75 V ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width) Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
DS8251-01 March 2011
Enable Pull Up Current
Feedback Reference Voltage
High-Side Switch-On Resistance
Low-Side Switch-On Resistance
High-Side Switch Leakage
Current Limit
Current Sense Transconductance
Error Amplifier Tansconductance
Oscillator Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On-Time
UVLO Threshold Rising
UVLO Threshold Hysteresis
EN
Threshold Logic High Voltage
Shutdown Current
Quiescent Current
Soft-Start Current
Soft-Start Period
Thermal Shutdown
IN
= 12V, T
JEDEC 51-7 thermal measurement standard. The case position of
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
Logic Low Voltage
= 25 C unless otherwise specified)
V
R
R
I
G
G
f
D
t
V
V
I
I
I
T
LIM
SW
ON
SHDN
Q
SS
Symbol
SD
FB
DS(ON)1
DS(ON)2
MAX
IL
IH
CS
m
A
4.75V ≦ V
V
Duty = 85%; V
Output Current to V
V
V
V
V
V
C
V
= 25 C on a high effective four layers thermal conductivity test board of
I
EN
FB
FB
EN
EN
EN
SS
SS
C
= ±10 A
= 0V
= 0.7V
= 0V, V
= 0V
= 0V
= 0V
= 2V, V
= 10nF
Test Conditions
IN
SW
FB
BOOT SW
≦ 24V
= 1V
= 0V
COMP
JC
is on the exposed pad of the packages.
= 4.8V
0.784
Min
420
1.4
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Typ
920
570
185
100
200
150
0.8
6.8
4.6
4.1
0.8
70
15
85
25
10
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1
1
RT8251
To be continued
www.richtek.com
0.816
Max
720
0.4
5.5
10
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1
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Unit
kHz
kHz
m
A/V
mV
mA
ms
A/V
ns
%
V
A
V
V
C
A
A
A
A
5