
RT8805C
Preliminary
6
DS8805C-03 August 2007
www.richtek.com
Recommended Operating Conditions
(Note 3)
z
Supply Voltage --------------------------------------------------------------------------------------------------------- 9V to 14V
z
Junction Temperature Range----------------------------------------------------------------------------------------
40
°
C to 125
°
C
z
Ambient Temperature Range----------------------------------------------------------------------------------------
40
°
C to 85
°
C
Electrical Characteristics
(V
IN
= 12V, T
A
= 25°C, unless otherwise specified)
Parameter
Supply Input
Symbol
Test Conditions
Min
Typ
Max
Units
Power Supply Voltage
V
CC
V
CC
--
12
15
V
Power On Reset
5.4
5.9
6.5
V
Power On Reset Hysteresis
--
0.3
--
V
Power Supply Current
I
VCC
V
EN
V
EN
V
SS
= 0V
--
10
--
mA
ON
--
0.3
--
V
PI Threshold
Hysteresis
--
50
--
mV
Soft Start
Soft Start Current
Oscillator
Free Running Frequency
Frequency Variation
Frequency Range
Maximum Duty Cycle
I
SS
f
OSC
RT = 33k
Ω
8
10
300
--
300
75
15
345
15
1000
80
To be continued
μ
A
kHz
%
kHz
%
255
-15
50
70
Absolute Maximum Ratings
(Note 1)
z
Supply Voltage, V
CC
--------------------------------------------------------------------------------------------------
0.3V to 16V
z
PHASE to GND
DC-------------------------------------------------------------------------------------------------------------------------
5V to 15V
< 200ns------------------------------------------------------------------------------------------------------------------
10V to 30V
z
BOOT to PHASE ------------------------------------------------------------------------------------------------------ 15V
z
BOOT to GND
DC-------------------------------------------------------------------------------------------------------------------------
0.3V to V
CC
+15V
< 200ns------------------------------------------------------------------------------------------------------------------
0.3V to 42V
z
Input, Output or I/O Voltage----------------------------------------------------------------------------------------- GND
-
0.3V to 7V
z
Power Dissipation, P
D
@ T
A
= 25
°
C
VQFN
16L 3x3--------------------------------------------------------------------------------------------------------- 1.47W
VQFN
24L 4x4--------------------------------------------------------------------------------------------------------- 1.923W
z
Package Thermal Resistance (Note 4)
VQFN
16L 3x3,
θ
JA
--------------------------------------------------------------------------------------------------- 68
°
C/W
VQFN
24L 4x4,
θ
JA
--------------------------------------------------------------------------------------------------- 52
°
C/W
z
Junction Temperature------------------------------------------------------------------------------------------------- 150
°
C
z
Lead Temperature (Soldering, 10 sec.)--------------------------------------------------------------------------- 260
°
C
z
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 1.5kV
MM (Machine Mode)-------------------------------------------------------------------------------------------------- 200V