MIC2179YSM Micrel Inc, MIC2179YSM Datasheet

IC,SMPS CONTROLLER,CURRENT-MODE,SSOP,20PIN,PLASTIC

MIC2179YSM

Manufacturer Part Number

MIC2179YSM

Description

IC,SMPS CONTROLLER,CURRENT-MODE,SSOP,20PIN,PLASTIC

Manufacturer

Micrel Inc

Type

Step-Down (Buck)r

Datasheet

1.MIC2179YSM_TR.pdf (13 pages)

Specifications of MIC2179YSM

Internal Switch(s)

Yes

Synchronous Rectifier

Yes

Number Of Outputs

Voltage - Output

1.25 ~ 16.5 V

Current - Output

1.5A

Frequency - Switching

200kHz

Voltage - Input

4.5 ~ 16.5 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

20-SSOP

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

576-1067

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MIC2179YSM

Manufacturer:

Micrel Inc

Quantity:

1 994

Company:

Meier Automation Equipment Co., Limited

Part Number:

MIC2179YSM

Manufacturer:

MICREL/麦瑞

Quantity:

20 000

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General Description

The Micrel MIC2179 is a 200kHz synchronous buck (step-

down) switching regulator designed for high-efficiency, bat-

tery-powered applications.

The MIC2179 operates from a 4.5V to 16.5V input and features

internal power MOSFETs that can supply up to 1.5A output

current. It can operate with a maximum duty cycle of 100%

for use in low-dropout conditions. It also features a shutdown

mode that reduces quiescent current to less than 5µA.

The MIC2179 achieves high efficiency over a wide output

current range by operating in either PWM or skip mode. The

operating mode is externally selected, typically by an intel-

ligent system, which chooses the appropriate mode according

to operating conditions, efficiency, and noise requirements.

The switching frequency is preset to 200kHz and can be

synchronized to an external clock signal of up to 300kHz.

The MIC2179 uses current-mode control with internal current

sensing. Current-mode control provides superior line regula-

tion and makes the regulator control loop easy to compensate.

The output is protected with pulse-by-pulse current limiting

and thermal shutdown. Undervoltage lockout turns the output

off when the input voltage is less than 4.5V.

The MIC2179 and is packaged in a 20-lead SSOP package

with an operating temperature range of –40°C to +85°C.

Typical Application

June 2009

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

Output Good

Output Low

5.4V to 16.5V

10µF

20V

PWM Mode

Skip Mode

20k

6.8nF

PWRGD

PWM

SYNC

COMP

2179-3.3

SGND

MIC

VIN

16,17

9–12

PGND

BIAS

Features

• 4.5V to 16.5V input voltage range

• Dual-mode operation for high efficiency (up to 96%)

• 150mΩ internal power MOSFETs at 12V input

• 200kHz preset switching frequency

• Low quiescent current

• Current-mode control

• 100% duty cycle for low dropout operation

• Current limit

• Thermal shutdown

• Undervoltage lockout

Applications

• High-efficiency, battery-powered supplies

• Buck (step-down) dc-to-dc converters

• Cellular telephones

• Laptop computers

• Hand-held instruments

• Battery Charger

0.01µF

3,4

1,2,

19,20

PWM mode for > 150mA load current

Skip mode for <150mA load current

1.0mA in PWM mode

600µA in skip mode

< 5µA in shutdown mode

Simplified loop compensation

Superior line regulation

1.5A Synchronous Buck Regulator

MBRM120

4.02k

22µH

Pins 4 and 18 are not connected.

Pins 3 and 4 can be connected

together for a low-impedance

connection.

MIC2179

100µF

6.3V

3.3V/600mA

OUT

M9999-063009

Related parts for MIC2179YSM

MIC2179YSM Summary of contents

Page 1

General Description The Micrel MIC2179 is a 200kHz synchronous buck (step- down) switching regulator designed for high-efficiency, bat- tery-powered applications. The MIC2179 operates from a 4.5V to 16.5V input and features internal power MOSFETs that can supply up to 1.5A ...

Page 2

... Ordering Information Part Number Standard* Pb-Free MIC2179BSM MIC2179YSM MIC2179-3.3BSM MIC2179-3.3YSM MIC2179-5.0BSM MIC2179-5.0YSM * Standard product will be supported as Pb-Free IAW PCCN #040004 effective 1-1-2005 pending residual depletion. Pin Configuration Pin Description Pin Number Pin Name 1, 2, 19, 20 PGND 3 5 PWM 6 PWRGD 7 8 COMP 9– ...

Page 3

Absolute Maximum Ratings Supply Voltage [100ms transient] (V ................................................... Output Switch Voltage ( Output Switch Current (I ) ......................................... 6.0A SW Enable, PWM Control Voltage (V EN Sync Voltage (V ) ...................................................... 6V SYNC Electrical Characteristics V = ...

Page 4

Symbol Parameter Enable Threshold I Enable Leakage EN PWM Threshold I PWM Leakage PWM PWRGD Threshold PWRGD Output Low PWRGD Off Leakage Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to ...

Page 5

Typical Characteristics Oscillator Frequency vs. Temperature 205 200 195 190 185 180 175 -60 - 120 150 TEMPERATURE (°C) Reference Voltage vs. Temperature 5.030 MIC2179-5.0 5.020 5.010 5.000 4.990 4.980 4.970 -60 - ...

Page 6

Block Diagram UVLO, Thermal Shutdown EN 3.3V Enable Regulator Shutdown 15 BIAS 14 R3 0.01µF 4.02k internal supply Voltage PWM PWM/ Skip Mode Skip-Mode PWM Mode 5 Select Corrective Ramp SYNC 200kHz Stop Oscillator 13 Reset Pulse R C COMP ...

Page 7

Functional Description Micrel’s MIC2179 is a synchronous buck regulator that oper- ates from an input voltage of 4.5V to 16.5V and provides a regulated output voltage of 1.25V to 16.5V. Its has internal power MOSFETs that supply up to 1.5A ...

Page 8

When V is lower than its nominal value, the error REF OUT amplifier output voltage increases. This voltage then intersects the current sense waveform later in switching period which increases the duty cycle and the average inductor current. ...

Page 9

PWM-Mode Functional Diagram Corrective Ramp 200kHz Stop Oscillator 13 Reset Pulse MIC2179 [Adjustable] PWM-Mode Signal Path Reset Pulse Error Amp. Output ...

Page 10

Skip-Mode Functional Diagram Output Control Logic MIC2179 [Adjustable] Skip-Mode Signal Path One-Shot Pulse 5mV – 5mV June 2009 One ...

Page 11

Application Information Feedback Resistor Selection (Adjustable Version) The output voltage is programmed by connecting an external resistive divider to the FB pin as shown in “MIC2179 Block Diagram.” The ratio determines the output voltage. To optimize ...

Page 12

The feedback resistors, RC compensation network, and BIAS pin bypass capacitor should be located close to their respective pins. To prevent ground bounce, their ground traces and SGND should not be in the path of switching Suggested Manufacturers List Inductors ...

Page 13

... Package Information 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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