KSZ8721BMC-EVAL Micrel Inc, KSZ8721BMC-EVAL Datasheet - Page 21

• 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
Voltage Regulator DC-to-DC Topologies
MIC/MAQ5280*
MIC2940A
MIC5203
MIC5205
MIC5219
MIC5245
MIC37102/502
MIC37302*
MIC39100/150/302
LM257x
MIC2176*
MIC457x
MIC2207/8*
MIC468x*
MIC4690*
MIC472x*
MIC4782*
MIC4742*/4*
MIC2177*
MIC2178*
MIC2179*
MIC2202/3/4/5/6*
MIC22200*
MIC2224*
MIC2225*
MIC22400*
MIC2245/85/85A*
MIC22600/1/2*
MIC2124*
MIC2130/1*
MIC2155/6
MIC2159*
MIC2164*
MIC2165/6*
MIC2168A
MIC2141*
MIC2142*
MIC2145*
MIC2171*
MIC2185*
MIC2186*
MIC2250*
MIC2253*
MIC2287*/8*/9*
MIC2290*
MIC2291/2/3*
LM257x
MIC2196*
MIC457x
MIC4680
MIC4681
MIC4690
Notes:
* = evaluation board is available.
1 = internal inductor
Device
MIC47050*/100*
MIC47150/300
MIC49150/300*
MIC59150/300*
MIC61150/300*
MIC68220*
MIC68400*
MIC69100*/153*/302*
MIC2267
MIC22700/705*
MIC22950*
MIC23xxx*
MIC26400*
MIC26600*
MIC26950*
MIC27600*
MIC33xxx* Note 1
MIC2169A/B*
MIC2174
MIC2176*
MIC2182*
MIC2183
MIC2193*
MIC2198*/9*
MIC2295*
MIC2296
MIC2297*
MIC2298*/9*
MIC2570*
MIC2601/2*
MIC2605/6*
MIC3172
MIC3287*
MIC3291
V
V
V
V
V
IN
IN
IN
IN
IN
Typical Applications
3
2
D
D
D
D
/D
/D
D
1
Input
Output
V
V
V
V
V
OUT
OUT
OUT
OUT
OUT
20
Pros
Linear Regulator
Only Steps Down (V
– Inexpensive
– Very Small
– Low Noise/EMI
– Ideal for:
Buck Regulator (Internal Switch)
Only Steps Down (V
– Lowest Peak Current
– Only One Switch Voltage Drop
– Low-Ripple Currnet In
– Output-Filter Capacitor
– Simple Inductor
– Low Switch-Stress Voltage
Eff ≈ +85%
Synchronous Buck Regulator
(Internal Switch)
– Highest Efficiency (+90%)
– Highest Efficiency Step Down
– Pros are the same as Buck
– High Output Current (up to 20A)
Synchronous Buck Regulator
(External Switch)
– Highest Efficiency (+90%)
– Highest Efficiency Step Down
– Pros are the same as Buck
– High Output Current (up to 20A)
Boost
Only Steps Down (V
– Low Peak Current
– Low-Side Switch
– Simple Inductor
– Low Switch-Stress Voltage
Eff ≈ 85%
Inverter/Buck-Boost
Negative Output Only
– Simple Inductor
Eff ≈ 85%
– 3.3V to 2.5V
– 2.5V to 1.8V
– 1.8V to 1.2V
OUT
OUT
OUT
< V
< V
< V
IN
IN
IN
)
)
)
Cons
Inefficient at high input-to-output voltage
differential
Eff = V
Note:
If a linear regulator gets too hot, then
use a buck switching regulator instead of
the new HELDO
High-Side Switch
I
DC ≈
Two Switches
I
DC ≈
Two Switches
I
DC ≈
Output can't be completely turned off.
No short-circuit protection.
I
DC ≈
High-Side Switch
High Peak Currents
I
DC ≈
SW
SW
SW
SW
SW
(Avg) ≈ I
(Avg) ≈ I
(Avg) ≈ I
(Avg) ≈
(Avg) ≈
V
V
OUT
V
V
OUT
IN
V
V
OUT
V
IN
V
OUT
IN
× Eff
/V
OUT
OUT
× Eff
– (V
× Eff
V
IN
1 – DC
OUT
OUT
+ (V
OUT
1 – DC
I
V
OUT
OUT
I
OUT
Micrel, Incorporated
OUT
®
IN
IN
MIC38300.
× Eff)
× Eff)