MIC2164_10 Datasheet, PDF (1/39 Pages) Micrel Semiconductor – Synchronous Buck Controllers Featuring Adaptive On-Time Control 28V Input, Constant Frequency

MIC2164/-2/-3/C
Synchronous Buck Controllers
Featuring Adaptive On-Time Control
28V Input, Constant Frequency
Hyper Speed Control™ Family
General Description
Features
The Micrel MIC2164/-2/-3/C are constant-frequency,
synchronous buck controllers featuring adaptive on-time
control. The MIC2164/-2/-3/C are the first products in the new
Hyper Speed Control™ family of buck controllers introduced
by Micrel.
The MIC2164/-2/-3/C controllers operate over an input supply
range of 3V to 28V, and are independent of the IC supply
voltage. The devices are capable of supplying 25A output
current. While the MIC2164 operates at 300kHz, the
MIC2164-2 operates at 600kHz, and the MIC2164-3 operates
at 1MHz.
A unique Hyper Speed Control™ architecture allows for ultra-
fast transient response while reducing the output capacitance
and also makes High V_IN/Low V_OUT operation possible. The
MIC2164/-2/-3/C controllers utilizes an architecture which is
adaptive T_ON ripple controlled. A UVLO feature is provided to
ensure proper operation under power-sag conditions to
prevent the external power MOSFET from overheating. A soft
start feature is provided to reduce the inrush current.
Foldback current limit and “hiccup” mode short-circuit
protection ensure FET and load protection.
• Hyper Speed Control™ architecture enables
- High delta V operation (V_HSD = 28V and V_OUT = 0.8V)
- Smaller output capacitors than competitors
• 3V to 28V input voltage
• Any Capacitor^TM stable
- Zero ESR to high ESR
• 25A output current capability
• 300kHz/600kHz/1MHz switching frequency
• Adaptive on-time mode control
• Adjustable output from 0.8V to 5.5V with ±1%
(MIC2164/-2/-3) or ±3% (MIC2164C) FB accuracy
• Up to 95% efficiency
• Foldback current-limit and “hiccup” mode short-circuit
protection
• 6ms Internal soft start
• Thermal shutdown
• Safe start-up into pre-biased loads
• –40°C to +125°C junction temperature range
• Available in 10-pin MSOP package
The MIC2164/-2/-3/C controllers are available in a 10-pin
MSOP (MAX1954A-compatible) package with a junction
operating range from –40°C to +125°C.
All support documentation can be found on Micrel’s web site
at: www.micrel.com.
Applications
• Set-top box, gateways and routers
• Printers, scanners, graphic cards and video cards
• Telecommunication, PCs and servers
________________________________________________________________________________________________________________________
Typical Application
MIC2164/-2/-3/C Synchronous Controllers Featuring Adaptive On-Time Control
100
95
90
85
80
75
70
65
60
55
50
0
MIC2164
12V to 3.3V Efficiency
VIN=5V
4
8
12
16
20
OUTPUT CURRENT (A)
Hyper Speed Control and Any Capacitor is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
September 2010
M9999-091310-D