RT6253A/B
Electrical Characteristics
TSOT-23-6 (FC)
(V
IN
= 12V, T
A
= 25C, unless otherwise specified )
Parameter
Supply Voltage
VIN Supply Input Operating
Voltage
Under-Voltage Lockout
Threshold
Under-Voltage Lockout
Threshold Hysteresis
Shutdown Current
Quiescent Current
Soft-Start
Soft-Start Time
Enable Voltage
Enable Voltage Threshold
EN Pin Pull-Down
Resistance
Symbol
Test Conditions
Min
Typ
Max
Unit
V
IN
V
UVLO
V
UVLO
I
SHDN
I
Q
t
SS
V
ENH
V
ENL
R
EN_DN
EN high-level input voltage
EN low-level input voltage
EN pin resistance to GND, V
EN
= 12V
4.5
3.7
--
V
EN
= 0V
V
EN
= 2V, V
FB
= 0.8V
--
--
--
1.16
1.01
225
--
4
400
3
280
1
1.25
1.1
450
17
4.3
--
10
--
--
1.34
1.19
900
V
V
mV
µA
µA
ms
V
k
Feedback Voltage and Discharge Resistance
Feedback Threshold Voltage V
FB
Feedback Input Current
Internal MOSFET
High-Side On-Resistance
Low-Side On-Resistance
Current Limit
High-Side Switch Current
Limit
Low-Side Switch Valley
Current Limit
Switching Frequency
Switching Frequency
On-Time Timer Control
On-Time
Minimum Off-Time
t
ON
t
OFF_MIN
V
OUT
= 1.05V
V
FB
= 0.5V
--
--
180
200
--
260
ns
ns
f
SW
V
OUT
= 1.05V,
PWM mode
--
580
--
kHz
I
LIM_H
I
LIM_L
--
3.2
5.6
4.2
--
A
5.2
R
DS(ON)_H
R
DS(ON)_L
V
BOOT
– V
SW
= 4.8V
--
--
95
50
--
--
mΩ
I
FB
V
OUT
= 1.05V
V
FB
= 0.8V, T
A
= 25
°C
758
0.1
765
0
772
0.1
mV
A
Output Under-Voltage Protections
UVP Trip Threshold
Hiccup Power On-Time
Hiccup Power Off-Time
V
UVP
t
HICCUP_ON
t
HICCUP_OFF
Hiccup detect
--
--
--
65
1.8
15
--
--
--
%
ms
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is a registered trademark of Richtek Technology Corporation.
www.richtek.com
8
DS6253A/B-01
September
2019
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
