Buck Controller. MIC2164-2 Datasheet

MIC2164-2 Controller. Datasheet pdf. Equivalent

Part MIC2164-2
Description 300kHz PWM Buck Controller
Feature MIC2164/-2/-3/C Synchronous Buck Controllers featuring Adaptive On-Time Control 28V Input, Constant .
Manufacture Micrel Semiconductor
Datasheet
Download MIC2164-2 Datasheet



MIC2164-2
MIC2164/-2/-3/C
Synchronous Buck Controllers featuring
Adaptive On-Time Control 28V Input,
Constant Frequency
Hyper Speed Control™ Family
General Description
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 VIN/Low VOUT
operation possible. The MIC2164/-2/-3/C controllers
utilizes an architecture which is adaptive TON 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.
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.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Hyper Speed Control™
Features
Hyper Speed Control architecture enables high delta V
operation (VHSD = 28V and VOUT = 0.8V) and smaller
output capacitors than competitors
3V to 28V input voltage
Any Capacitor™ 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, “hiccup” mode short-circuit
protection, thermal shutdown, and safe pre-bias startup
6ms Internal soft start
–40°C to +125°C junction temperature range
Available in 10-pin MSOP package
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
Hyper Speed Control and Any Capacitor are trademarks of Micrel, Inc.
100
95
90
85
80
75
70
65
60
55
50
0
MIC2164
12V to 3.3V Efficiency
VIN=5V
4 8 12 16
OUTPUT CURRENT (A)
20
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 12, 2015
Revision 4.1



MIC2164-2
Micrel, Inc.
MIC2164/-2/-3/C
Ordering Information
Part Number
Voltage(1)
Switching
Frequency
Accuracy
MIC2164YMM
Adjustable
300kHz
±1%
MIC2164-2YMM Adjustable
600kHz
±1%
MIC2164-3YMM Adjustable
1MHz
±1%
MIC2164CYMM Adjustable
270kHz
±3%
Note:
1. Other voltages are available. Contact Micrel for details.
Junction Temperature Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
10-pin MSOP
10-pin MSOP
10-pin MSOP
10-pin MSOP
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pin Configuration
10-Pin MSOP (MM)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
HSD
EN
FB
GND
IN
DL
PGND
DH
Pin Function
High-Side N-MOSFET Drain Connection (input): Power to the drain of the external high-side N-channel
MOSFET. The HSD operating voltage range is from 3V to 28V. Input capacitors between HSD and the
power ground (PGND) are required.
Enable (input): A logic level control of the output. The EN pin is CMOS-compatible. Logic high or
floating = enable, logic low = shutdown. In the off state, supply current of the device is greatly reduced
(typically 0.8mA).
Feedback (input): Input to the transconductance amplifier of the control loop. The FB pin is regulated to
0.8V. A resistor divider connecting the feedback to the output is used to adjust the desired output
voltage.
Signal ground. GND is the ground path for the device input voltage VIN and the control circuitry. The
loop for the signal ground should be separate from the power ground (PGND) loop.
Input Voltage (input): Power to the internal reference and control sections of the MIC2164/-2/-3. The IN
operating voltage range is from 3V to 5.5V. A 1µF and 0.1µF ceramic capacitors from IN to GND are
recommended for clean operation.
Low-Side Drive (output): High-current driver output for external low-side MOSFET. The DL driving
voltage swings from ground-to-IN.
Power Ground. PGND is the ground path for the MIC2164/-2/-3 buck converter power stage. The
PGND pin connects to the sources of low-side N-Channel MOSFETs, the negative terminals of input
capacitors, and the negative terminals of output capacitors. The loop for the power ground should be as
small as possible and separate from the Signal ground (GND) loop.
High-Side Drive (output): High-current driver output for external high-side MOSFET. The DH driving
voltage is floating on the switch node voltage (LX). It swings from ground to VIN minus the diode drop.
Adding a small resistor between DH pin and the gate of the high-side N-channel MOSFETs can slow
down the turn-on and turn-off time of the MOSFETs.
February 12, 2015
2
Revision 4.1







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