RT2702
Parameter
VREF
Internal Reference Voltage
Output Voltage Accuracy
Switching Frequency Control
Switching Frequency
f
SW
V
IN
= 6V, V
OUT
= 1V,
R
TON
= 390k
V
FB
= 0.55V
V
FB
> 0.6V
I
SS
t
SS_INT
V
SS
= VDRV, 10% V
REF
to 90%
V
REF
--
--
20
8
1
500
275
--
10
3
--
400
--
12
5
kHz
ns
kHz
A
ms
V
REF
V
FB
T
A
= 25°C
V
FB
to RGND excluding external
resistor divider tolerance
0.597
-1
0.6
--
0.603
1
V
%
Symbol
Test Conditions
Min
Typ
Max
Unit
Minimum Turn Off Time (LG on) t
OFF_MIN
Minimum Skip Mode Frequency
Soft- Start
Soft Start Setting Current
Internal Soft Start
Soft- Off
Soft Off Bleeding Resistor
Over Current Protection
V
ILIM
Output Voltage
Over Current Threshold Offset
Zero Current Threshold
Protection and PGOOD
POK Output Voltage
OVP Threshold
UVP Threshold
Power Good Low Delay
PWM Driving Capability
PWM Source Resistor
PWM Sink Resistor
Logic I/O
EN Input Threshold Voltage
MODE Input Voltage
THWN
Input Voltage
R
DIS
V
ILIM
V
OC_OFS
V
ZC
V
CSP
V
CSN
= V
ILIM
x (R
CS
/R
ILIM
)
= 50mV
GND – PHASE
Logic low, sinking 4 mA
V
OVP
V
UVP
t
POK_DLY
R
PWM_SRC
R
PWM_SK
V
EN_OFF
V
EN_ON
V
MODE_L
V
MODE_H
V
THWN_L
V
THWN_H
--
1.188
3
6
--
108.5
83.5
--
V
DRV
to PWM
PWM to GND
Controller OFF
Controller ON
ASM (Audio Skipping Mode)
FCCM
PWM float, VDRV remains ON
Normal operation
VDRV to
DISB
DISB
to GND
30
1.2
--
--
--
112.5
87.5
10
--
--
0.92
1
--
--
--
--
--
--
--
1.212
3
2
0.4
116.5
91.5
--
35
15
1
1.05
0.4
--
0.4
--
55
30
V
mV
mV
V
%
%
s
V
V
V
V
V
V
V
FB
rising
V
FB
falling
--
--
0.8
0.88
--
1.2
--
2
--
--
DISB
Output Resistor
V
DISB_SRC
V
DISB_SK
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
6
DS2702-02 May 2019
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
