5
DS8241-03 January 2014
www.richtek.com
RT8241
©
Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Parameter Symbol Test
Conditions Min
Typ
Max
Unit
Current Sensing
CS Source Current
9
10
11
μ
A
CS Source Current
Temperature Coefficient
-- 4700 -- ppm/
°
C
Zero Crossing Threshold
PHASE
−
GND
−
10
-- 5 mV
Protection Function
Current Limit Threshold
Offset
GND
−
PHASE = VCS/8
−
20 0 20 mV
Negative Current Limit
Threshold Offset
PHASE
−
GND
=
VCS/8
-- 3 -- mV
Under Voltage Protection
UVP Detect, Falling Edge
0.41
0.45
0.49
V
UVP Fault Delay
V
FB
=
0.375V
-- 3.5 --
μ
s
Over Voltage Protection
OVP Detect, Rising Edge
1.065
1.1
1.133
V
OVP Fault Delay
V
FB
=
1.183V
-- 5 --
μ
s
V
CC
Under Voltage Lockout
(UVLO) Threshold
V
UVLO
Falling edge, PWM disabled below
this level
3.5 3.7 3.9 V
V
CC
UVLO Hysteresis
Δ
V
UVLO
-- 100 -- mV
VOUT Soft-Start
From EN = High to V
OUT
= 95%
--
0.8
--
ms
Dynamic VID Slew Rate
S
GX
G0/G1
Transition
1.75
--
10
mV/
μ
s
UVP Blank Time
From EN signal going high
--
3
-
ms
Thermal Shutdown
T
SD
-- 150 --
Thermal Shutdown
Hysteresis
Δ
T
SD
-- 10 --
°
C
Driver On-Resistance
UGATE Driver Source
R
UGATEsr
BOOT
−
PHASE forced to 5V,
UGATE High State
-- 1.8 3.6
Ω
UGATE Driver Sink
R
UGATEsk
BOOT
−
PHASE forced to 5V,
UGATE Low State
-- 1.2 2.4
Ω
LGATE Driver Source
R
LGATEsr
LGATE, High State
-- 1.8 3.6
Ω
LGATE Driver Sink
R
LGATEsk
LGATE, Low State
-- 0.8
1.34
Ω
LGATE Rising (V
PHASE
= 1.5V)
--
30
--
Dead Time
UGATE Rising
--
30
--
ns
Internal Boost Charging
Switch On-Resistance
VCC to BOOT, 10mA
--
--
80
Ω
EN Threshold
Logic-High V
IH
1.8
--
--
EN Threshold
Voltage
Logic-Low V
IL
--
--
0.5
V
Voltage Programming (G0, G1)
Logic-High
750
--
--
G0, G1 Input
Threshold
Voltage
Logic-Low
--
--
300
mV
