RT5779A/B
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Current Limit
High-Side Switch Peak
Current Limit
ILIM_H
--
--
9.7
7
--
--
A
Low-Side Switch Valley
Current Limit
ILIM_L
Switching
Switching Frequency
fSW
VOUT = 1.2V
1300 1500 1700
kHz
ns
Minimum Off-Time
Internal MOSFET
High-Side On-Resistance
Low-Side On-Resistance
Soft-Start
tOFF_MIN
--
60
--
RDS(ON)_H
RDS(ON)_L
--
--
20
18
--
--
m
Fixed Soft-Start Time
VOUT
tSS
1
1.5
1
--
--
ms
Output Discharge Resistor
Power Good
(Note 5)
--
k
Power-Good High Threshold VTH_PGLH
VFB rising. PGOOD goes high
--
--
--
--
--
95
5
--
--
--
--
--
%VFB
%VFB
%VFB
%VFB
s
Power-Good High Hysteresis VTH_PGLH VFB falling. PGOOD goes low
Power-Good Low Threshold VTH_PGHL VFB rising. PGOOD goes low
110
5
Power-Good Low Hysteresis VTH_PGHL VFB falling. PGOOD goes high
Power Good Delay Time
15
Power Good Sink Current
IPGOOD sinks 1mA
Capability
--
--
--
0.4
--
V
Power Good Internal Pull Up
Resistance
550
k
Over-Temperature Protection
Thermal Shutdown
TSD
--
--
150
30
--
--
C
Thermal Shutdown
Hysteresis
∆TSD
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and 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 may
affect device reliability.
Note 2. θJA is measured in the natural convection at TA = 25°C on a four-layer Richtek Evaluation Board for TSOT-23-8 (FC).
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. Guarantee by design.
Copyright 2017 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
8
DS5779A/B-00 October 2017
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
