LinearVoltageRegulators Motorola Semiconductor Products, LinearVoltageRegulators Datasheet - Page 25

• Manufacturer Part Number: LinearVoltageRegulators
• Description: Analog And Interface Integratedcircuits Selector Guide & Cross Reference
• Manufacturer: Motorola Semiconductor Products

Switching Regulator Control Circuits
Critical Conduction SMPS Controller
MC33364D, D1, D2
T J = –25 to +125 C, Case 751, 751B
lers that operate in the critical conduction mode. They are opti-
mized for low power, high density power supplies requiring
minimum board area, reduced component count, and low
power dissipation. Each narrow body SOIC package provides
a small footprint. Integration of the high voltage startup saves
approximately 0.7 W of power compared to resistor boot-
strapped circuits.
function, a watchdog timer to initiate output switching, a zero
current detector to ensure critical conduction operation, a
current sensing comparator, leading edge blanking, and a
CMOS driver. Protection features include the ability to shut
down switching, and cycle–by–cycle current limiting.
package. It has an internal 126 kHz frequency clamp. For
loads which have a low power operating condition, the fre-
MOTOROLA
54
The MC33364 series are variable frequency SMPS control-
Each MC33364 features an on–board reference, UVLO
The MC33364D1 is available in a surface mount SO–8
Current
ZC Det
Sense
FB
Blanking
Detector
Leading
Current
Edge
Zero
Comparator
PWM
(continued)
Watchdog
Shutdown
Thermal
S
R
R
Timer
Q
quency clamp limits the maximum operating frequency, pre-
venting excessive switching losses and EMI radiation.
an internal frequency clamp.
has an internal 126 kHz frequency clamp which is pinned
out, so that the designer can adjust the clamp frequency
by connecting appropriate values of resistance and
capacitance.
Restart
Delay
Lossless Off–Line Startup
Leading Edge Blanking for Noise Immunity
Watchdog Timer to Initiate Switching
Minimum Number of Support Components
Shutdown Capability
Over Temperature Protection
Optional Frequency Clamp
The MC33364D2 is available in the SO–8 package without
The MC33364D is available in the SO–16 package. It
ANALOG AND INTERFACE INTEGRATED CIRCUITS
UVLO
V ref
Frequency
Clamp
Reference
SELECTOR GUIDE & CROSS REFERENCE
Bandgap
UVLO
V CC
Line
V CC
V ref
Gnd
Gate
Optional
Frequency
Clamp