MIC4684
Micrel
MIC4684
2A High-Efficiency SuperSwitcher鈩?Buck Regulator
Final Information
General Description
The MIC4684 is a high-efficiency 200kHz stepdown (buck)
switching regulator. Power conversion efficiency of above
85% is easily obtainable for a wide variety of applications.
The MIC4684 achieves 2A of continuous current in an 8-lead
SO (small outline) package at 60掳C ambient temperature.
High efficiency is maintained over a wide output current range
by utilizing a boost capacitor to increase the voltage available
to saturate the internal power switch. As a result of this high
efficiency, no external heat sink is required. The MIC4684,
housed in an SO-8, can replace larger TO-220 and TO-263
packages in many applications.
The MIC4684 allows for a high degree of safety. It has a wide
input voltage range of 4V to 30V (34V transient), allowing it to
be used in applications where input voltage transients may be
present. Built-in safety features include over-current protec-
tion, frequency-foldback short-circuit protection, and thermal
shutdown.
The MIC4684 is available in an 8-lead SO package with a
junction temperature range of 鈥?0掳C to +125掳C.
Features
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SO-8 package with 2A continuous output current
Over 85% efficiency
Fixed 200kHz PWM operation
Wide 4V to 30V input voltage range
Output voltage adjustable to 1.235V
All surface mount solution
Internally compensated with fast transient response
Over-current protection
Frequency foldback short-circuit protection
Thermal shutdown
Simple high-efficiency step-down regulator
5V to 3.3V/1.7A converter (60掳C ambient)
12V to 1.8V/2A converter (60掳C ambient)
On-card switching regulator
Dual-output
卤5V
converter
Battery charger
Applications
Ordering Information
Part Number
MIC4684BM
Voltage
Adj
Junction Temperature Range
鈥?0掳C to +125掳C
Package
SOP-8
Typical Application
V
IN
6.5V to 25V
3
8
MIC4684BM
VIN
BS
EN
SW
FB
GND
2, 6, 7
4
1
C
BS
0.33碌F/50V
68碌H
R1
3.01k
R2
3.01k
V
OUT
2.5V/1.5A
330碌F
6.3V
C
IN
33碌F
35V
5
Efficiency
vs. Output Current
100
V
OUT
= 3.3V
80
3A
40V
EFFICIENCY (%)
60
40
20
0
Adjustable Buck Converter
1A, 20V Feed forward diode
V
IN
5V
卤10%
V
OUT
= 1.8V
V
OUT
= 2.5V
V
IN
= 5.0V
0.5
1
1.5
OUTPUT CURRENT (A)
2
3
8
MIC4684BM
VIN
BS
EN
SW
FB
GND
2, 6, 7
4
1
C
BS
0.33碌F/50V
47碌H
0
V
OUT
3.3V/1.7A
220碌F
10V
C
IN
68碌F
10V
5
Efficiency vs. Output Current
2A
20V
5V to 3.3V Converter
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
July 2001
1
MIC4684
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