MIC38HC45YM Micrel Inc, MIC38HC45YM Datasheet

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MIC38HC45YM

Manufacturer Part Number
MIC38HC45YM
Description
Monolithic SMPS Controller ( )
Manufacturer
Micrel Inc
Datasheet

Specifications of MIC38HC45YM

Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
50%
Voltage - Supply
7.6 V ~ 20 V
Buck
Yes
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
500kHz
Number Of Pwm Outputs
1
On/off Pin
No
Adjustable Output
No
Switching Freq
500KHz
Operating Supply Voltage (max)
20V
Output Current
1000A
Synchronous Pin
No
Rise Time
20ns
Fall Time
15ns
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
576-1519-5
MIC38HC45YM

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MIC38HC45YM
Manufacturer:
MICREL
Quantity:
51
MIC38HC42/3/4/5
General 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 de-
vices. Their high output drive, with fast rise and fall times,
combined with low startup current make it 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 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 effi-
ciency, 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.
Functional Diagram
April 2005
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
RT/CT
VREF
VDD
7 (12)
8 (14)
4 (7)
2 (3)
FB
( ) pins are on MIC38HC4x-1 (14-lead) versions only
* MIC38HC4x (8-lead) versions only
MIC38HC42, MIC38HC43 (96% max. duty cycle) versions only
MIC38HC44, MIC38HC45 (50% max. duty cycle) versions only
2.5V
COMP
1 (1)
35V
GND*(AGND)
Reference
Oscillator
5
2R
5V
R
(9)
ISNS
3 (5)
1
UVLO
Features
• Fast 20ns output rise and 15ns output fall times
• –40°C to +85°C temperature range
• High-performance, low-power BiCMOS Process
• Ultralow start-up current (50µA 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
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
BiCMOS 1A Current-Mode PWM Controllers
exceeds UC284x specifications
T
S
R
MIC38HC42/3/4/5
*
*
Q
Q
(VD)
(11)
OUT
6 (10)
(PGND)
(8)
M9999-042205
Micrel, Inc.

Related parts for MIC38HC45YM

MIC38HC45YM Summary of contents

Page 1

MIC38HC42/3/4/5 General 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 de- vices. Their high output drive, with fast rise and fall times, combined with low ...

Page 2

... Contact Factory –40°C to +85°C MIC38HC42YM –40°C to +85°C MIC38HC43YM –40°C to +85°C MIC38HC44YM –40°C to +85°C MIC38HC45YM –40°C to +85°C MIC38HC42-1YM –40°C to +85°C MIC38HC43-1YM –40°C to +85°C MIC38HC44-1YM –40°C to +85°C MIC38HC45-1YM – ...

Page 3

MIC38HC42/3/4/5 Pin Configuration MIC38HC4x COMP ISNS 3 RT/CT 4 8-Pin DIP (N) 8-Lead SOIC (M) Pin Description Pin Number Pin Number Pin Name -1BN, -1BM ...

Page 4

MIC38HC42/3/4/5 Absolute Maximum Ratings Zener Current (V ) ................................................... 30mA DD ≥ Operation at 18V may require special precautions (Note 6). Supply Voltage (V ), Note 6 ....................................... 20V DD Switch Supply Voltage (V ) .......................................... 20V D Current Sense ...

Page 5

MIC38HC42/3/4/5 Parameter Test Conditions Current Sense Gain Notes 2, 3 MaximumThreshold V COMP PSRR 12 ≤ V Input Bias Current Delay to Output Output R ‘HC’ High I DS(ON) SOURCE R ‘HC’ Low I DS(ON) SINK Rise Time T A ...

Page 6

MIC38HC42/3/4/5 Typical Characteristics Oscillator Frequency Configuration 100 200pF 470pF 1nF 1.8nF 10 4.7nF 10nF V = 15V 1x10 1x10 1x10 OSCILLATOR FREQUENCY (Hz) Current Sense Amplifier vs. Error Amplifier Output 1.2 1.0 125°C 0.8 0.6 ...

Page 7

MIC38HC42/3/4/5 Package Information 0.018 (0.57) .235 (5.969) .215 (5.461) .160 MAX (4.064) .160 (4.064) .100 (2.540) April 2005 PIN 1 DIMENSIONS: INCH (MM) 0.380 (9.65) 0.370 (9.40) 0.135 (3.43) 0.125 (3.18) 0.380 (9.65) 0.130 (3.30) 0.320 (8.13) 0.100 (2.54) 0.0375 ...

Page 8

... MAX) 0.057 (1.45) 0.049 (1.25) MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...

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