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MIC2178-3.3BWM

Description
Switching Regulator Obsolete; Replace with MIC2178-3.3YWM (RoHS)
CategoryPower/power management    The power supply circuit   
File Size169KB,15 Pages
ManufacturerMicrel ( Microchip )
Websitehttps://www.microchip.com
Download Datasheet Parametric Compare View All

MIC2178-3.3BWM Overview

Switching Regulator Obsolete; Replace with MIC2178-3.3YWM (RoHS)

MIC2178-3.3BWM Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerMicrel ( Microchip )
package instructionSOP, SOP20,.4
Reach Compliance Codenot_compliant
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage16.5 V
Minimum input voltage4.5 V
Nominal input voltage7 V
JESD-30 codeR-PDSO-G20
JESD-609 codee0
length12.878 mm
Humidity sensitivity level1
Number of functions1
Number of terminals20
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current6 A
Nominal output voltage3.3 V
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP20,.4
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)240
Certification statusNot Qualified
Maximum seat height2.616 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency240 kHz
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn85Pb15)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width7.6 mm
MIC2178
Micrel, Inc.
MIC2178
2.5A Synchronous Buck Regulator
General Description
The Micrel MIC2178 is a 200kHz synchronous buck (step-
down) switching regulator designed for high-efficiency, bat-
tery-powered applications.
The MIC2178 operates from a 4.5V to 16.5V input and
features internal power MOSFETs that can supply up to 2.5A
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 MIC2178 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 intelli-
gent 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 MIC2178 uses current-mode control with internal current
sensing. Current-mode control provides superior line regula-
tion and makes the regulator control loop easy to compen-
sate. 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 MIC2178 and is packaged in a 20-lead wide power SOIC
package with an operating temperature range of –40°C to
+85°C.
See the MIC2177 for automatic selection of PWM or skip-
mode operation.
Features
• 4.5V to 16.5V input voltage range
• Dual-mode operation for high efficiency (up to 96%)
PWM mode for > 200mA load current
Skip mode for < 200mA load current
• 100mΩ internal power MOSFETs at 12V input
• 200kHz preset switching frequency
• Low quiescent current
1.0mA in PWM mode
600µA in skip mode
< 5µA in shutdown mode
• Current-mode control
Simplified loop compensation
Superior line regulation
• 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
Palmtop computers
Laptop computers
Cellular telephones
Hand-held instruments
Battery Chargers
Typical Application
V
IN
5.4V to 18V
C1
22µF
35V
C2
22µF
35V
R1
20k
ON
OFF
20
11
Skip Mode
PWM Mode
10
18
ENABLE
U1
1,2,9
10
3,8
4–7
12
100
5V Output
Efficiency
Ouput Good
Output Low
L1, 33µH
D1
MBRS140
C5
220µF
10V
EFFICIENCY (%)
VIN
EN
MIC2178-5.0
OUT
PWRGD
PWM
SYNC
COMP SGND
13
14–17
V
OUT
5V/2.5A
C6
220µF
10V
95
90
85
80
75
SKIP
PWM
100
1000 2500
OUTPUT CURRENT (mA)
V
IN
= 6V
SW
PGND
FB
BIAS
19
R1
10k
C3
6.8nF
C4
0.01µF
R2
10k
70
10
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2005
1
M9999-031805

MIC2178-3.3BWM Related Products

MIC2178-3.3BWM MIC2178-5.0BWM-TR MIC2178-3.3YWM
Description Switching Regulator Obsolete; Replace with MIC2178-3.3YWM (RoHS) switching regulator Switching Regulator 2.5A 200kHz Synchronous Switcher
Maker Micrel ( Microchip ) Micrel ( Microchip ) Micrel ( Microchip )
Encapsulation - Reel Tube
Maximum input voltage 16.5 V - 16.5 V
Minimum input voltage 4.5 V - 4.5 V
Maximum operating temperature 85 °C - + 85 C
Minimum operating temperature -40 °C - - 40 C
Product Category - switching regulator switching regulator
Installation style - SMD/SMT SMD/SMT
Package/box - SOIC-20 SOIC-20
product - Voltage Regulators Switching Regulators
type - Charge Pump Synchronous Buck Regulator
Factory packaging quantity - 1000 38
unit weight - 537.300 mg 801 mg
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