MIC2165 Controller Datasheet

MIC2165 Datasheet PDF, Equivalent


Part Number

MIC2165

Description

Adaptive On-Time DC-DC Controller

Manufacture

Micrel Semiconductor

Total Page 28 Pages
PDF Download
Download MIC2165 Datasheet PDF


MIC2165
MIC2165
Adaptive On-Time DC-DC Controller
Featuring HyperLight Load®
Hyper Speed Control™ Family
General Description
The Micrel MIC2165 is a synchronous adaptive on-time
buck controller targeting high-performance, cost-sensitive
applications such as set-top boxes, gateways, routers,
computing peripherals, and telecom/networking
equipment.
The MIC2165 operates over a supply range of 4.5V to
28V. It has an internal linear regulator which provides a
regulated 5V supply to power the internal control circuitry.
MIC2165 operates at a constant 600kHz switching
frequency and can be used to drive up to 25A of output
current. The output voltage is adjustable from 0.8V to
5.5V.
A unique Hyper Speed Control™ architecture enables
ultra-fast transient response while reducing the output
capacitance and also makes High VIN/Low VOUT operation
possible.
A UVLO feature is provided to ensure proper operation
under power-sag conditions to prevent the external power
MOSFET from over heating. Also, a soft start feature is
provided to reduce the inrush current. Short current
sensing on the bottom MOSFET with hiccup mode current
limiting ensures protection in case of an output short
circuit. Further, the MIC2165 includes an EN pin to shut
down the converter and a Power Good (PGOOD) pin to
allow simple sequencing.
The MIC2165 is available in a 10-pin MSOP ePad
package with a junction operating temperature ranging
from –40°C to +125°C. All support documentation can be
found on Micrel’s web site at: www.micrel.com.
Features
Hyper Speed Control™ architecture enables
High VIN Low VOUT operation (VIN=28V & VOUT=0.8V)
Small output capacitance
HyperLight Load® Efficiency
Built-in 5V regulator for single-supply operation
Any CapacitorTM stable
- Zero ESR to high ESR
Power-Good output
Input voltage range: 4.5V to 28V
5μA typical shutdown current
25A output current drive capability
Adjustable output from 0.8V to 5.5V with ±1% FB
Accuracy
600kHz switching frequency
Internal 5ms digital Soft Start
Thermal shutdown and hiccup current-limit protection
No external current-sense resistor required
Safe start-up into pre-biased loads
10-pin MSOP ePad package
–40°C to +125°C junction temperature range
Applications
Set-top box, gateways, routers and DSL modems
Printers, scanners, graphic and video cards
Servers, PCs and processor core supply
Low-Voltage Distributed Power
Typical Application
MIC2165 Adjustable Output 600kHz Buck Converter
100
90
80
70
60
50
40
30
20
10
0
0.01
12V to 3.3V Efficiency
0.10
1.00
OUTPUT CURRENT (A)
10.00
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
HyperLight Load is a registered trademark of Micrel, Inc.
Hyper Speed Control and Any Capacitor are trademarks of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2010
M9999-092410-E

MIC2165
Micrel, Inc.
MIC2165
Ordering Information
Part Number
MIC2165YMME
Voltage
Adj.
Switching Frequency
600kHz
Junction Temp. Range
–40° to +125°C
Package
10-pin ePad MSOP
Lead Finish
Pb-Free
Pin Configuration
10-Pin ePad MSOP (MME)
Pin Description
Pin
Number
1
2
3
4
5
6
7
8
9
10
EP
Pin Name
FB
PGOOD
EN
VIN
VDD
DL
PGND
DH
SW
BST
GND
Pin Function
Feedback (Input): Input to the transconductance amplifier of the control loop. The FB pin is regulated to
0.8V. A resistor divider connecting the output to FB is used to set the desired output voltage.
Power Good (Output): Open Drain Output. The PGOOD pin is externally tied with a resistor to VDD.
High output when VOUT>90% nominal.
Enable (Input): A logic level control of the output. The EN pin is CMOS-compatible. Logic high = enable,
logic low = shutdown. In the off state, supply current of the device is greatly reduced (typically 5µA). The
EN pin should not be left open. Connect to VIN if sequencing not required.
Supply Voltage: Input voltage for the internal +5V linear regulator. The VIN operating voltage range is
from 4.5V to 28V. A 0.1µF capacitor between VIN and the ground is required.
5V Internal Linear Regulator (Output): VDD is the external MOSFET gate drive supply voltage and an
internal supply bus for the IC. VDD is created by internal LDO from VIN. When VIN <+5.5V, VDD Should
be tied to VIN. A 2.2µF (minimum) ceramic capacitor from VDD to GND is recommended for clean
operation.
Low-Side Gate Drive (Output): High-current driver output for external low-side MOSFET. The DL driving
voltage swings from ground to VDD.
Power Ground. PGND is the ground path for the MIC2165 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 Gate Drive (Output): High-current driver output for external high-side MOSFET. The DH
driving voltage is floating on the switch node voltage (SW). It swings from ground-to-VDD minus the
diode drop.
Switch Node (Input): High current output driver return. The SW pin connects directly to the switch node.
Due to the high speed switching on this pin, the SW pin should be routed away from sensitive nodes.
Current-Sense Input (Input): SW pin also senses the current by monitoring the voltage across the low-
side MOSFET during OFF-time. The current sensing is necessary for short circuit protection and zero
current cross comparator. In order to sense the current accurately, connect the low-side MOSFET drain
to SW using a Kelvin connection.
Boost (Output): Bootstrapped voltage to the high-side N-channel MOSFET driver. A Schottky diode is
connected between the VDD pin and the BST pin. A boost capacitor of 0.1μF is connected between the
BST pin and the SW pin. Adding a small resistor at BST pin can slow down the turn-on time of high-side
N-Channel MOSFETs.
Thermal Pad and Signal ground. GND is the ground path for VDD and the control circuitry. The loop for
the signal ground should be separate from the power ground (PGND) loop.
September 2010
2 M9999-092410-E


Features MIC2165 Adaptive On-Time DC-DC Controlle r Featuring HyperLight Load® Hyper Spe ed Control™ Family General Descripti on The Micrel MIC2165 is a synchronous adaptive on-time buck controller target ing high-performance, cost-sensitive ap plications such as set-top boxes, gatew ays, routers, computing peripherals, an d telecom/networking equipment. The MIC 2165 operates over a supply range of 4. 5V to 28V. It has an internal linear re gulator which provides a regulated 5V s upply to power the internal control cir cuitry. MIC2165 operates at a constant 600kHz switching frequency and can be u sed to drive up to 25A of output curren t. The output voltage is adjustable fro m 0.8V to 5.5V. A unique Hyper Speed Co ntrol™ architecture enables ultra-fas t transient response while reducing the output capacitance and also makes High VIN/Low VOUT operation possible. A UVL O feature is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFET from over heating. Also, a soft s.
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