Datasheet
−
+
QS
1.25-V
Reference
Regulator
R
C
T
I
pk
Oscillator
Q2
Q1
Switch
Collector
4
Switch
Emitter
Timing
Capacitor
GND
3
2
18
7
6
5
Comparator
Inverting Input
V
CC
I
pk
Sense
Drive
Collector
100 Ω
Absolute Maximum Ratings
(1)
Recommended Operating Conditions
MC33063A-Q1
SLLS654B – APRIL 2005 – REVISED SEPTEMBER 2008 ................................................................................................................................................
www.ti.com
FUNCTIONAL BLOCK DIAGRAM
over operating free-air temperature range (unless otherwise noted)
V
CC
Supply voltage 40 V
V
IR
Comparator Inverting Input voltage range – 0.3 V to 40 V
V
C(switch)
Switch Collector voltage 40 V
V
E(switch)
Switch Emitter voltage V
PIN1
= 40 V 40 V
V
CE(switch)
Switch Collector to Switch Emitter voltage 40 V
V
C(driver)
Driver Collector voltage 40 V
I
C(driver)
Driver Collector current 100 mA
I
SW
Switch current 1.5 A
θ
JA
Package thermal impedance
(2) (3)
97 ° C/W
T
J
Operating virtual junction temperature 150 ° C
T
stg
Storage temperature range – 65 ° C to 150 ° C
(1) Stresses beyond those listed under " 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 under " recommended operating
conditions " is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Maximum power dissipation is a function of T
J
(max), θ
JA
, and T
A
. The maximum allowable power dissipation at any allowable ambient
temperature is P
D
= (T
J
(max) – T
A
)/ θ
JA
. Operating at the absolute maximum T
J
of 150 ° C can affect reliability.
(3) The package thermal impedance is calculated in accordance with JESD 51-7.
MIN MAX UNIT
V
CC
Supply voltage 3 40 V
T
A
Operating free-air temperature – 40 125 ° C
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