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MIC38C42 Datasheet(PDF) 1 Page - Micrel Semiconductor

Part No. MIC38C42
Description  BiCMOS Current-Mode PWM Controllers
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC38C42 Datasheet(HTML) 1 Page - Micrel Semiconductor

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MIC38C42/3/4/5
Micrel, Inc.
July 2005
1
M9999-072805
MIC38C42/3/4/5
BiCMOS Current-Mode PWM Controllers
General Description
The MIC38C4x are fixed frequency, high performance, cur-
rent-mode PWM controllers. Micrel’s 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 50µAtypical and
operating current has been reduced to 4.0 mA typical. De-
creased output rise and fall times drive larger MOSFETs, and
rail-to-rail output capability increases efficiency, especially at
lowersupplyvoltages. TheMIC38C4x alsofeaturesatrimmed
oscillator discharge current and bandgap reference.
TheMIC38C4xdenotes8-pinplasticDIPandSOICpackages.
MIC384Cx-1 denotes 14-pin plastic DIPand SOIC packages.
8-pindevicesfeaturesmallsize,while14-pindevicesseparate
the analog and power connections for improved perfomance
and power dissipation.
For fast rise and fall times and higher output drive, refer to
the MIC38HC4x.
Functional Diagram
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
Applications
• 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
T Q
S
R Q
R
2R
Oscillator
UVLO
5V
Reference
VDD
7 (12)
VREF
8 (14)
RT/CT
4 (7)
FB
2 (3)
2.5V
COMP
1 (1)
GND* (AGND)
5
(9)
ISNS
3 (5)
OUT
6 (10)
( )
pins are on MIC38C4x-1 (14-lead) versions only
*
MIC38C4x, (8-lead) versions only
(VD)
(11)
(PGND)
(8)
35V
*
*
MIC38C42, MIC38C43 (96% max. duty cycle) versions only
MIC38C44, MIC38C45 (50% max. duty cycle) versions only
MM8 is a trademark of Micrel, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com


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