MIC2103 Datasheet, PDF (1/36 Pages) Micrel Semiconductor – 75V, Synchronous Buck Controllers featuring Adaptive On-Time Control

MIC2103/04
75V, Synchronous Buck Controllers
featuring Adaptive On-Time Control
Hyper Speed Control™ Family
General Description
The Micrel MIC2103/04 are constant-frequency,
synchronous buck controllers featuring a unique adaptive
ON-time control architecture. The MIC2103/04 operates
over an input supply range from 4.5V to 75V and can be
used to supply up to 15A of output current. The output
voltage is adjustable down to 0.8V with a guaranteed
accuracy of ±1%. The device operates with programmable
switching frequency from 200kHz to 600kHz.
Micrel’s Hyper Light Load™ architecture provides the same
high-efficiency and ultra fast transient response as the Hyper
Speed Control architecture under the medium to heavy loads,
but also maintains high efficiency under light load conditions
by transitioning to variable frequency, discontinuous-mode
operation.
The MIC2103/04 offers a full suite of protection features to
ensure protection of the IC during fault conditions. These
include under-voltage lockout to ensure proper operation
under power-sag conditions, internal soft-start to reduce
inrush current, fold-back current limit, “hiccup” mode short-
circuit protection and thermal shutdown.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Features
 Hyper Speed Control architecture enables
- High delta V operation (V_IN = 75V and V_OUT = 1.2V)
- Any Capacitor^TM stable
 4.5V to 75V input voltage
 0.8V Reference Voltage with ±1% accuracy
 200kHz to 600kHz, programmable switching frequency
 Hyper Light Load Control (MIC2103 only)
 Hyper Speed Control (MIC2104 only)
 Enable input, Power-Good output
 Built-in 5V regulator for single-supply operation
 Programmable current limit and fold-back “hiccup”
mode short-circuit protection
 5ms internal soft-start, internal compensation, and
thermal shutdown
 Supports safe start-up into a pre-biased output
 –40C to +125C junction temperature range
 Available in 16-pin 3mm x 3mm MLF^® package
Applications
 Distributed power systems
 Networking/Telecom Infrastructure
 Printers, scanners, graphic cards and video cards
_________________________________________________________________________________________________________________________
Typical Application
Efficiency (VIN = 48V)
100 ^{vs. Output Current (MIC2103)}
90
5.0V
80
3.3V
70
2.5V
1.8V
60
1.2V
0.8V
50
40
30
20
fSW = 200kHz (CCM)
10
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
OUTPUT CURRENT (A)
Hyper Speed Control, Hyper Light Load 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 [phone] • fax + 1 [phone] • http://www.micrel.com
August 2012
M9999-080712-A