MIC2176-1 Datasheet, PDF (1/31 Pages) Micrel Semiconductor – Wide Input Voltage, Synchronous Buck Controllers Featuring Adaptive On-Time Control

MIC2176-1/-2/-3
Wide Input Voltage, Synchronous Buck
Controllers Featuring Adaptive On-Time
Control
Hyper Speed Control™ Family
General Description
Features
The Micrel MIC2176-1/-2/-3 is a family of constant-frequency,
synchronous buck controllers featuring a unique digitally
modified adaptive ON-time control architecture. The MIC2176
family operates over an input supply range of 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%, and the device operates at a constant
switching frequency of 100kHz, 200kHz, and 300kHz.
Micrel’s Hyper Speed Control^TM architecture allows for ultra-
fast transient response while reducing the output capacitance
• Hyper Speed Control^TM architecture enables
- High delta V operation (V_IN = 75V and V_OUT = 1.2V)
- Small output capacitance
• 4.5V to 75V input voltage
• Output down to 0.8V with ±1% accuracy
• Any Capacitor^TM Stable
- Zero-ESR to high-ESR output capacitance
• 100kHz/200kHz/300kHz switching frequency
• Internal compensation
and also makes (High V_IN)/(Low V_OUT) operation possible.
This digitally modified adaptive t_ON ripple control architecture
combines the advantages of fixed-frequency operation and
fast transient response in a single device.
The MIC2176 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, internal soft-start to reduce
inrush current, fold-back current limit, “hiccup” mode short-
• 6ms Internal soft-start
• Foldback current limit and “hiccup” mode short-circuit
protection
• Thermal shutdown
• Supports safe start-up into a pre-biased output
• –40°C to +125°C junction temperature range
• Available in 10-pin MSOP package
circuit protection and thermal shutdown.
Applications
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
• Distributed power systems
• Networking/Telecom Infrastructure
• Printers, scanners, graphic cards and video cards
___________________________________________________________________________________________________________
Typical Application
MIC2176-2 Adjustable Output 200KHz Buck Converter
95
90
85
80
75
70
65
60
55
50
45
40
0
Efficiency
vs. Output Current
28V_IN
48VIN
60VIN
MIC2176-2
VOUT = 3.3V
V_DD = 5V LINEAR
1
2
3
4
5
OUTPUT CURRENT (A)
Hyper Speed Control, 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 [phone] • fax + 1 [phone] • http://www.micrel.com
November 2010
M9999-111710-A