KSZ8721BMC-EVAL Micrel Inc, KSZ8721BMC-EVAL Datasheet - Page 7

• Manufacturer Part Number: KSZ8721BMC-EVAL
• Description: BOARD EVALUATION FOR KSZ8721BMC
• Manufacturer: Micrel Inc

Specifications of KSZ8721BMC-EVAL

• Main Purpose: Interface, Ethernet PHY
• Embedded: No
• Utilized Ic / Part: KSZ8721BMC
• Primary Attributes: 1 Port, 100BASE-TX/100BASE-FX/10BASE-T
• Secondary Attributes: MII, RMII, HP Auto MDI, MDI-X Auto Polarity Correction
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1627

February 2011
Analog Product Highlight — MIC27600 & MIC2267
SuperSwitcher II™
The Micrel MIC27600, the latest addition to the SuperSwitcher II™ family,
is a constant-frequency, synchronous buck regulator featuring a unique
digitally modified adaptive on-time control architecture. The MIC27600 op-
erates over an input supply range of 4.5V to 36V and provides a regulated
output of up to 7A of output current. The output voltage is adjustable down
to 0.8V with a guaranteed accuracy of ±1%, and the device operates at a
switching frequency of 300kHz.
Micrel’s Hyper Speed Control™ architecture allows for ultra-fast transient
response while reducing the output capacitance and also makes (High V
(Low V
control architecture combines the advantages of fixed-frequency operation
and fast transient response in a single device.
The MIC27600 offers a full suite of protection features to ensure protec-
tion 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, foldback current limit, “hiccup” mode short-circuit
protection and thermal shutdown.
Features
Applications
4.5V to 36V
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V
EN
5V
V
DD
IN
OUT
Hyper Speed Control™ architecture enables
4.5V to 36V voltage input
Adjustable output from 0.8V to 5.5V (V
Adjustable output from 0.8V to 3.6V (V
±1% FB accuracy
Any Capacitor™ Stable - Zero-ESR to high-ESR
7A output current capability, up to 95% efficiency
300kHz switching frequency
Internal compensation, 6ms internal soft-start
Thermal shutdown
Supports safe startup into a pre-biased load
28-pin 5mm x 6mm MLF
Distributed power systems
Communications/networking infrastructure
Set-top box, gateways and routers
Printers, scanners, graphic cards and video cards
2.2µF
4.7µF
x2
) operation possible. This digitally modified adaptive t
VDD
SGND
VIN
PVIN
PGND
EN
MIC27600
BST
SW
CS
FB
MIC27600
®
0.1µF
package
10k
0.1µF
4µH
HSD
HSD
10k
3.24k
≤ 28V)
≤ 36V)
22nF
100µF
V
3.3V/7A
OUT
ON
ripple
IN
)/
6
USB
HUB
USB Power Maximizer™
The MIC2267 is a USB Power Maximizer™ which transfers the maximum
power from the limited USB current source by shaping the input current limit
profile. It incorporates a high efficiency, integrated synchronous step down
regulator. Internal 150mΩ switches and adjustable operating frequency
allows the MIC2267 to achieve greater than 90% efficiency across a broad
load range. It replaces the USB current limit switch, 5V buck regulator
and minimizes capacitance for many USB applications. The adjustable
frequency control can be utilized to move harmonics away from sensitive
frequency bands.
The MIC2267 allows the input current limit profile to be shaped for various
applications. With a current mode control with external compensation,
the MIC2267 transient response can be optimized over load and output
capacitance making it highly flexible for many applications.
Additional features include 1µA shutdown current, output current limit and
thermal shutdown protection.
Features
Applications
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10µF
Input voltage range: 3.0V to 5.5V
Output voltage adjustable down to 1.0V
Up to 96% efficiency at 500mA output
Efficiency >90% across a broad load range
Fast transient response
Adjustable frequency from 400kHz to 1.5MHz
Adjustable input current limiting 100mA to over 1A
100% maximum duty cycle
Fully integrated MOSFET switches
Micropower shutdown
Thermal shutdown and output current-limit protection
12-pin 3mm x 3mm MLF
USB power
Wireless router cards
General buck converter applications
100k
2.2nF
75k
PGOOD
EN
FILTER
FREQ
VIN
SLOPEC
150k
LIMIT PGND AGND
MIC2267
MIC2267
®
COMP
SW
FB
11.5k
15nF
4.7µH
680pF
23k
10k
VOUT = 3.6V
Micrel, Incorporated
CBULK
WIRELESS
MODEM
OTHER
DATA