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MIC38HC45

Features: • Fast 20ns output rise and 15ns output fall times• 40°C to +85°C temperature range exceeds UC284x specifications• High-performance, low-power BiCMOS Process• Ultralow start-up current (50A typical)• Low operating current (4mA typical)• High output dri...

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MIC38HC45: Features: • Fast 20ns output rise and 15ns output fall times• 40°C to +85°C temperature range exceeds UC284x specifications• High-performance, low-power BiCMOS Process• Ultra...

MIC38HC45 Data Sheet

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Part Number:
MIC38HC45
Supply Ability:
5000

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Product Details

Description



Features:

• Fast 20ns output rise and 15ns output fall times
• 40°C to +85°C temperature range exceeds UC284x specifications
• High-performance, low-power BiCMOS Process
• Ultralow start-up current (50A typical)
• Low operating current (4mA typical)
• High output drive (1A peak current, HC version)
• CMOS outputs with rail-to-rail swing
• Current-mode operation up to 500kHz
• 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


Application

• Current-mode, off-line, switched-mode power supplies
• Current-mode, dc-to-dc converters.
• Step-down "buck" regulators
• Step-up "boost" regulators
• Flyback, isolated regulators
• Forward converters
• Synchronous FET converters


Pinout

Connection Diagram


Specifications

Zener Current (VDD) ..................................................30mA
Operation at 18V may require
special precautions (Note 6).
Supply Voltage (VDD), Note 6 .......................................20V
Switch Supply Voltage (VD) ..........................................20V
Current Sense Voltage (VISNS) .....................0.3V to 5.5V
Feedback Voltage (VFB) ................................0.3V to 5.5V
Output Current, 38HC42/3/4/5 (IOUT) ...........................1A
Operating Junction Temperature (TJ) .......................150°C
Package Thermal Resistance
8-Pin Plastic DIP (JA) ......................................... 125°C/W
8-Pin MM8™ (JA) ............................................... 250°C/W
8-Pin SOIC (JA) ..................................................170°C/W
14-Pin Plastic DIP (JA) ......................................... 90°C/W
14-Pin SOIC (JA) ................................................145°C/W
Storage Temperature (TA) ......................65°C to +150°C


Description

The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability. Micrel's BiCMOS devices are pin-compatible with 384x bipolar devices.Their high output drive, with fast rise and fall times,combined with low startup current make MIC38HC4x family an ideal PWM controller where high efficiency is required.

Undervoltage lockout circuitry allows the '42 and '44 versions to start up at 14.5V and operate down to 9V, and the '43 and '45 versions start at 8.4V with operation down to 7.6V. All versions operate up to 20V.

When compared to bipolar UC384x devices operating from a 15V supply, start-up current has been reduced to 50A typical and operating current has been reduced to 4.0 mA typical. Decreased output rise and fall times drive larger MOSFETs, and rail-to-rail output capability increases efficiency,especially at lower supply voltages. The MIC38HC4x also features a trimmed oscillator discharge current and bandgap reference.

MIC38HC4x-1 is available in 14-pin plastic DIP and SOIC packages. 8-pin devices feature small size, while 14-pin devices separate the analog and power connections for improved performance and power dissipation.




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