MIC2164 Datasheet, PDF (1/36 Pages) Micrel Semiconductor – Constant Frequency, Synchronous Buck Controllers Featuring Adaptive On-Time Control

MIC2164/-2/-3
Constant Frequency, Synchronous
Buck Controllers Featuring
Adaptive On-Time Control
Hyper Speed Control™ Family
General Description
Features
The Micrel MIC2164/-2/-3 are constant frequency,
synchronous buck controllers featuring adaptive on-time
control. The MIC2164/-2/-3 are the first products in the new
Hyper Speed Control^TM family of buck controllers introduced
by Micrel.
The MIC2164/-2/-3 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
• Hyper Speed Control^TM architecture enables
- High delta V operation (V_IN=28V and V_OUT=0.8V)
- Smaller output capacitors than competitors
• 3V to 28V input voltage
• Stable with zero-ESR output capacitor
• 25A output current capability
• 300kHz/600kHz/1MHz switching frequency
current. While the MIC2164 operates at 300kHz, the • Adaptive on-time mode control
MIC2164-2 operates at 600kHz, and the MIC2164-3 operates
at 1MHz.
A unique Hyper Speed Control^TM 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 controllers utilizes an architecture which is
adaptive Ton ripple controlled. A UVLO feature is provided to
ensure proper operation under power-sag conditions to
• Output down to 0.8V with ±1% FB accuracy
• Up to 95% efficiency
• Foldback current limit and “hiccup” mode short-circuit
protection
• 6ms Internal soft start
• Thermal shutdown
• Pre-bias output safe
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
• –40°C to +125°C junction temperature range
• Available in 10-pin MSOP package
protection ensure FET and load protection.
Applications
The MIC2164/-2/-3 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.
• Set-top box, gateways and routers
• Printers, scanners, graphic cards and video cards
• Telecommunication, PCs and servers
• Microprocessor core supply
• Low-voltage distributed power
________________________________________________________________________________________________________________________
Typical Application
MIC2164/-2/-3 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)
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
September 2009
M9999-090409-B