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MIC38C45-1BM Datasheet(PDF) 8 Page - Micrel Semiconductor

Part # MIC38C45-1BM
Description  BiCMOS Current-Mode PWM Controllers
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC38C45-1BM Datasheet(HTML) 8 Page - Micrel Semiconductor

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MIC38C42/3/4/5
Micrel, Inc.
M9999-091107
8
September 2007
Symbol
Custom Coil1
ETS2
CT1
4923
ETS 92420
T1
4924
ETS 92419
L1
4925
ETS 92421
1. Custom Coils, Alcester, SD tel: (605) 934-2460
2. Energy Transformation Systems, Inc. tel: (415) 324-4949.
Test
Conditions
Results
Line Regulation VIN = 26V to 80V, IO = 2A
0.5%
Load Regulation VIN = 48V, IO = 0.2A to 2A
0.6%
Efficiency
VIN = 48V, IO = 2A
90%
Output Ripple
VIN = 48V, IO = 2A (20MHz BW)
100mV
Synchronous Buck Converter
Refertofigure2. ThisMIC38C43synchronousbuckconverter
uses an MIC5022 half-bridge driver to alternately drive the
PWMswitchMOSFET(drivenbyGATEH,orhigh-sideoutput)
and a MOSFET which functions as a synchronous rectifier
(driven by the GATEL, or low-side output).
The low-side MOSFET turns on when the high-side MOS-
FET is off, allowing current to return from ground. Current
flows through the low-side MOSFET in the source to drain
direction.
The on-state voltage drop of the low-side MOSFET is lower
than the forward voltage drop of an equivalent Schottky recti-
fier. This lower voltage drop results in higher efficiency.
A sense resistor (5mΩ) is connected to the driver’s high-
side current sense inputs to provide overcurrent protection.
Refer to the MIC5020, MIC5021, and MIC5022 data sheets
for more information.
Figure 2. 100kHz, Synchronous Buck Converter
MIC38C43
0.1µF
300k
4.3k
VOUT
5V, 8A
0.15µF
35µH
1000µF
Low ESR
0.1µF
SMP60N06-14
VDD
V R E F
GND
COM P
VOUT
RT/CT
F B
I S N S
4.7nF
10k
10k
6.8k
47k
3.3k
2200
pF
470µF
25V
MIC5022
VB
GAT E H
SH+
GAT E L
SH–
SL+
C T
GND
E N
FLT
VDD
+12V
5mΩ
0.1µF*
MKS2
*Locate near the MIC38C43 supply pins.
NC
NC
IN
NC
S L–


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