General Description The MIC38C4x are fixed frequency, high performance, current-mode PWM controllers. Micrel’s BiCMOS devices are pin compatible with 384x bipolar devices but feature several improvements.

Features • Fast 40ns output rise and 30ns output fall times
• –40°C to +85°C temperature range meets UC284x specifications
• High-performance, low-power BiCMOS Process
• Ultralow start-up current (50µA typical)
• Low operating current (4mA typical)
• CMOS outputs with rail-to-rail swing
• ≥ 500kHz current-mode operation
• Trimmed 5V bandgap reference
• Pin-for-pin compatible with UC3842/3843/3844/3845(A)
• Trimmed oscillator discharge current
• UVLO with hysteresis
• Low cross-conduction currents

Features • Fast 40ns output rise and 30ns output fall times
• –40°C to +85°C temperature range
meets UC284x specifications
• High-performance, low-power BiCMOS Process
• Ultralow start-up current (50µA typical)
• Low operating current (4mA typical)
• CMOS outputs with rail-to-rail swing
• ≥ 500kHz current-mode operation
• Trimmed 5V bandgap reference
• Pin-for-pin compatible with UC3842/3843/3844/3845(A)
• Trimmed oscillator discharge current
• UVLO with hysteresis
• Low cross-conduction currents

Manufacturer	Microchip Technology
Product Category	AC DC Converters, Offline Switchers
Series	MIC38C42
Packaging	Tube
Unit-Weight	0.080001 oz
Mounting-Style	Through Hole
Package-Case	8-DIP (0.300", 7.62mm)
Operating-Temperature	-40°C ~ 150°C (TJ)
Mounting-Type	*
Supplier-Device-Package	8-DIP
Watt	-
Number-of-Outputs	1 Output
Output-Isolation	Isolated
Internal-Switch-s	Yes
Voltage-Breakdown	-
Topology	Boost, Buck, Flyback, Forward
Voltage-Start-Up	14.5V
Voltage-Supply-Vcc-Vdd	9 V ~ 20 V
Duty-Cycle	96%
Frequency-Switching	500kHz
Fault-Protection	-
Control-Features	Frequency Control
Isolation	Isolated
Maximum Operating Temperature	+ 85 C
Operating temperature range	- 40 C
Output-Voltage	5 V
Operating-Supply-Current	4 mA
Input-Voltage	9 V
Output-Current	500 mA
Switching-Frequency	500 kHz
Fall-Time	30 ns
Rise-Time	40 ns
Package-Case	DIP-8
Duty-Cycle-Max	96 %