MIC3809YM Micrel Inc, MIC3809YM Datasheet

MIC3809YM

Manufacturer Part Number

MIC3809YM

Description

Push-Pull DC/DC Controller ( )

Manufacturer

Micrel Inc

Datasheet

1.MIC3808YM.pdf (11 pages)

Specifications of MIC3809YM

Lead Free Status

Lead free

Pwm Type

Current Mode

Number Of Outputs

Frequency - Max

1MHz

Duty Cycle

50%

Voltage - Supply

2 V ~ 14 V

Buck

Yes

Boost

Flyback

Inverting

Doubler

Divider

Cuk

Isolated

Yes

Operating Temperature

-40°C ~ 85°C

Package / Case

8-SOIC (3.9mm Width)

Frequency-max

1MHz

Lead Free Status / RoHS Status

Other names

576-1770-5
MIC3809YM

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Download datasheet (146Kb)

General Description

The MIC3808 and MIC3809 are a family of complementary

output push-pull PWM control ICs that feature high speed and

low power consumption. The MIC3808/9 are ideal for telecom

level (36V to 75V) isolated step down dc/dc conversion

applications where high output current, small size, and high

efficiency are required.

The dual-ended push-pull architecture of the MIC3808/9

allows more efficient utilization of the transformer than single-

ended topologies, allowing smaller size dc/dc solutions.

Additionally, the out-of-phase push-pull topology allows a

higher effective duty cycle, reducing input and output ripple

as well as stress on the external components. The dead-time

between the two outputs is adjustable between 60ns to

200ns, limiting the duty cycle of each output stage to less than

50%.

The MIC3808/9 are built on a low-power, high-speed BiCMOS

process. The 130µA start-up current and 1mA run-current

reduce the size of the start-up circuitry and allow high

efficiency even at light loads. The high-speed internal 4MHz

error amplifier allows MIC3808/9 operation up to 1MHz.

The MIC3808 has a turn-on threshold of 12.5V whereas the

MIC3809 has a lower turn-on threshold of 4.3V. Both devices

are available in SOP-8 and MSOP-8 package options with an

operating range of –40°C to +85°C.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Typical Application

April 2005

MIC3808/3809

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

36V to 75V

GND

COMP OUTB

MIC3808

Start-Up

Circuitry

OUTA

VDD

Comp

Slope

Features

• Dual output drive stages in push-pull configuration

• Leading edge current-sense blanking

• 130µA typical start-up current

• 1mA typical run current

• Operation to 1MHz

• Internal soft start

• On-chip error amplifier with 4MHz gain bandwidth

• On-chip V

• Output drive stages capable of 500mA peak source

Applications

• High efficiency “brick” power supply modules

• Telecom equipment and power supplies

• Networking power supplies

• Industrial power supplies

• 42V automotive power supplies

• Base stations

product

current, 1A peak sink current

• Half bridge converters

• Full bridge converters

• Push-pull converters

• Voltage-fed push-pull converters

Reference

& Isolation

Push-Pull PWM Controller

clamping

MIC3808/3809

12V 100W

OUT

MIC3808/3809

Micrel

Related parts for MIC3809YM

MIC3809YM Summary of contents

Page 1

MIC3808/3809 General Description The MIC3808 and MIC3809 are a family of complementary output push-pull PWM control ICs that feature high speed and low power consumption. The MIC3808/9 are ideal for telecom level (36V to 75V) isolated step down dc/dc conversion ...

Page 2

... MIC3808/3809 Ordering Information Part Number Standard Lead-Free MIC3808BM MIC3808YM MIC3809BM MIC3809YM MIC3808BMM MIC3808YMM MIC3809BMM MIC3809YMM Pin Configuration Pin Description Pin Number Pin Name 1 COMP MIC3808/3809 Turn On Turn Off Threshold Threshold Temperature Range 12.5V 8.3V 4.3V 4.1V 12.5V 8.3V 4.3V 4.1V COMP ...

Page 3

MIC3808/3809 Pin Description Pin Number Pin Name 5 GND 6 OUTB 7 OUTA 8 VDD April 2005 Pin Function Ground Alternating high current output stages. Both stages are capable of driving the gate of a power MOSFET. Each stage is ...

Page 4

MIC3808/3809 Absolute Maximum Ratings Supply Voltage (I ≤ 10mA) ...................................... +15V DD Supply Current ........................................................... 20mA OUTA/OUTB Source Current (peak) .......................... –0.5A OUTA/OUTB Sink Current (peak) ................................ 1.0A Comp Pin ......................................................................V Analog Inputs (FB, CS) ........................ –0. Junction ...

Page 5

MIC3808/3809 Parameter Condition Undervoltage Lockout Section Start Threshold MIC3808, Note 9 MIC3809 Minimum Operating Voltage MIC3808 After Start MIC3809 Hysteresis MIC3808 MIC3809 Soft Start Section COMP Rise Time FB = 1.8V, Rise from 0. Overall Section Startup Current ...

Page 6

MIC3808/3809 Typical Characteristics MIC3808 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0 (V) DD MIC3809 Oscillator Frequency Variation vs. Temperature ...

Page 7

MIC3808/3809 V Supply Current DD vs. Temperature 10V -40 - 100120140 TEMPERATURE (°C) April 2005 Error Ampifier 120 180 160 100 140 80 120 60 ...

Page 8

MIC3808/3809 Functional Diagram FB Overcurrent Comparator 0.75V 2. —1V DD 0.5V Soft Start Voltage Reference Functional Description The MIC3808 high-speed power supply controller with push-pull output drive capability. MIC3808 has a higher V turn-on ...

Page 9

MIC3808/3809 VDD 0.2V Figure 2. Oscillator The voltage source to the resistor/capacitor timing compo- nents The internal turn-off comparator threshold in the DD oscillator circuit is V /2. This ...

Page 10

MIC3808/3809 Output Drivers OUTA and OUTB are alternating output stages, which switch at half the oscillator frequency. A toggle flip-flop in the MIC3808/9 guarantee both outputs will not the same time. The RC discharge time is the ...

Page 11

MIC3808/3809 Package Information 0.026 (0.65) 0.157 (3.99) 0.150 (3.81) 0.064 (1.63) 0.045 (1.14) 0.122 (3.10) 0.112 (2.84) 0.036 (0.90) 0.032 (0.81) 0.012 (0.3) 0.0256 (0.65) TYP MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 ...

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