Richtek RT7285C, Manual

Page: 3 / 15

RT7285C
3
DS7285C-03 July 2014 www.richtek.com
© Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Parameter Symbol Test Conditions Min Typ Max Unit
Shutdown Current I
SHDN
V
EN
= 0V -- -- 4

A
Quiescent Current I
Q
V
EN
= 2V, V
FB
= 1V -- 0.5 -- mA
Switch-On Resistance
High-Side R
DS(ON)_H
V
BOOT

SW
= 4.8V -- 230 --
m

Low-Side R
DS(ON)_L
V
IN
= 5V -- 130 --
Current Limit I
LIM
Valley Current 1.7 2.2 2.8 A
Oscillator Frequency f
SW
-- 500 -- kHz
Maximum Duty Cycle D
MAX
-- 90 -- %
Minimum On-Time t
ON
-- 60 -- ns
Feedback Threshold Voltage V
FB
591 600 609 mV
EN Input Threshold
Logic-High V
EN_H
1.5 -- --
V
Logic-Low V
EN_L
-- -- 0.4
VIN Under-Voltage Lockout
Threshold
V
UVLO
V
IN
Rising 3.55 3.9 4.25 V
VIN Under-Voltage Lockout
Threshold Hysteresis
-- 340 -- mV
Electrical Characteristics
(V
IN
= 12V, T
A
= 25
°
C, unless otherwise specified)
Absolute Maximum Ratings
(Note 1)

VIN to GND -----------------------------------------------------------------------------------------------------
−
0.3V to 20V

SW to GND ----------------------------------------------------------------------------------------------------
−
0.3V to (V
IN
+ 0.3V)
< 10ns-----------------------------------------------------------------------------------------------------------
−
5V to 25V

BOOT to GND ------------------------------------------------------------------------------------------------- (V
SW
−
0.3V) to (V
SW
+ 6V)

Other Pins------------------------------------------------------------------------------------------------------ − 0.3V to 6V

Power Dissipation, P
D
@ T
A
= 25
° C
SOT-23-6 / TSOT-23-6 --------------------------------------------------------------------------------------- 0.625W

Package Thermal Resistance (Note 2)
SOT-23-6 / TSOT-23-6,
θ
JA
--------------------------------------------------------------------------------- 160
°
C/W
SOT-23-6 / TSOT-23-6,
θ
JC
--------------------------------------------------------------------------------- 15
°
C/W

Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------ 260 ° C

Junction Temperature ---------------------------------------------------------------------------------------- 150 ° C

Storage Temperature Range ------------------------------------------------------------------------------- − 65 ° C to 150 ° C

ESD Susceptibility (Note 3)
HBM (Human Body Model) --------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions
(Note 4)

Supply Input Voltage, VIN ---------------------------------------------------------------------------------- 4.3V to 18V

Junction Temperature Range -------------------------------------------------------------------------------
−
40
°
C to 125
°
C

Ambient Temperature Range -------------------------------------------------------------------------------
−
40
°
C to 85
°
C