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MIC26903YJL-TR

Description
Conv DC-DC 4.5V to 28V Synchronous Step Down Single-Out 0.8V to 5.5V 9A 28-Pin QFN EP T/R
File Size778KB,31 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Download Datasheet Download user manual Parametric View All

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MIC26903YJL-TR Overview

Conv DC-DC 4.5V to 28V Synchronous Step Down Single-Out 0.8V to 5.5V 9A 28-Pin QFN EP T/R

MIC26903YJL-TR Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeSynchronous Step Down
Output TypeAdjustable
Switching Frequency (kHz)600(Typ)
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)0.8 to 5.5
Maximum Output Current (A)9
Minimum Input Voltage (V)4.5
Maximum Input Voltage (V)28
Operating Supply Voltage (V)4.5 to 28
Typical Quiescent Current (uA)450
Line Regulation0.25%(Typ)
Load Regulation0.25%(Typ)
Efficiency (%)80
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
PackagingTape and Reel
Supplier PackageQFN EP
Pin Count28
MountingSurface Mount
Package Height0.85(Max)
Package Length6
Package Width5
PCB changed28
MIC26903
28V, 9A Hyper Light Load™
Synchronous DC/DC Buck Regulator
SuperSwitcher IIG™
General Description
The Micrel MIC26903 is a constant-frequency,
synchronous DC/DC buck regulator featuring adaptive on-
time control architecture. The MIC26903 operates over a
supply range of 4.5V to 28V. It has an internal linear
regulator which provides a regulated 5V to power the
internal control circuitry. MIC26903 operates at a constant
600kHz switching frequency in continuous conduction
mode and can be used to provide up to 9A of output
current. The output voltage is adjustable down to 0.8V.
Micrel’s Hyper Light Load™ architecture provides the same
high-efficiency and ultra-fast transient response as the
Hyper Speed Control™ architecture under medium to heavy
loads, but also maintains high efficiency under light load
conditions by transitioning to variable frequency,
discontinuous mode operation.
The MIC26903 offers a full suite of protection features to
ensure protection of the IC during fault conditions. These
include undervoltage lockout to ensure proper operation
under power-sag conditions, thermal shutdown, internal
soft-start to reduce the inrush current, foldback current
limit and “hiccup mode” short-circuit protection. The
MIC26903 includes a Power Good (PG) output to allow
simple sequencing.
All support documentation can be found on Micrel’s web
site at:
www.micrel.com.
Features
Hyper Light Load™ efficiency – up to 80% at 10mA
Hyper Speed Control™ architecture enables
High delta V operation (V
IN
= 28V and V
OUT
= 0.8V)
Small output capacitance
Input voltage range: 4.5V to 28V
Output current up to 9A
Up to 95% efficiency
Adjustable output voltage from 0.8V to 5.5V
±1% FB accuracy
Any Capacitor
TM
stable
zero-to-high ESR
600kHz switching frequency
Power Good (PG) output
Foldback current-limit and “hiccup” mode short-circuit
protection
Safe start-up into pre-biased loads
5mm
×
6mm MLF
®
package
–40°C to +125°C junction temperature range
Applications
Distributed power systems
Telecom/networking infrastructure
Printers, scanners, graphic cards and video cards
___________________________________________________________________________________________________________
Efficiency (V
IN
= 12V)
vs. Output Current
100
95
90
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
Typical Application
EFFICIENCY (%)
85
80
75
70
65
60
55
50
0
3
6
9
V
IN
= 12V
12
OUTPUT CURRENT (A)
Hyper Speed Control, Hyper Light Load, SuperSwitcher II, and Any Capacitor are trademarks of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, 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
July 2011
M9999-071311-A
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