MIC38C45YM More Semiconductors - ICs by Microchip Technology

20V, Current Mode SMPS Controller Family with Various UVLO and Max Duty Cycle

Status: Active
Series: MIC38C45
RoHS: Compliant
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The MIC38C4x are fixed frequency, high performance, current-mode PWM controllers. BiCMOS devices are pin compatible with 384x bipolar devices but feature several improvements. 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 384x devices operating from a 15V supply, start-up current has been reduced to 50µA 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 MIC38C4x also features a trimmed oscillator discharge current and bandgap reference. MIC38C4x denotes 8-pin plastic DIP, SOIC, and MM8® packages. MIC38C4x-1 denotes 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. For fast rise and fall times and higher output drive, refer to the MIC38HC4x.

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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
Ultra-low 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

Specifications

Supported Topologies Forward,Flyback
Supported Outputs 1
Minimum Input Voltage (V) 7.6
Maximum Input Voltage (V) 20
Typical Tolerance (%) ±2
Duty Cycle Max (%) 0.5
Internal Voltage Bias True
Input UVLO Typ (V) 8.4
Operating Supply Current (mA) 4
Package 8/PDIP, 8/SOIC, 8/MSOP 14/PDIP, 14/SOIC
Pins | Packaging 8 | SOIC
Temp Range -40C to +85C
Packing Media Tube (95)

Resources


Environmental Information

JEDEC Indicator e4
ROHS Compliant
China EFUP Compliant
Device Weight (g) 0.075
Shipping Weight (kg) 0.163265
Lead Count 8
Package Type SOIC
Package Width or Size 3.90mm(.150in)
Soldering Composition NiPdAu

Alternative Descriptions

Monolithic SMPS Controller | Microchip Technology
IC: PMIC | Transfer Multisort Elektronik
Pwm Ctrl, Current Mode, 7.6-20V, Soic-8 | Newark Electronics
MIC38C44 Series 6 mA 500 kHz SMT BiCMOS Current-Mode PWM Controller - SOIC-8 | Future Electronics
MONOLITHIC SMPS CONTROLLER | Avnet America
PWM CTRL, CURRENT MODE, 7.6-20V, SOIC-8 | Farnell


Frequently Asked Questions

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Is the MIC38C45YM RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Microchip Technology.

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