MIC4684BM Micrel Inc, MIC4684BM Datasheet - Page 5

• Manufacturer Part Number: MIC4684BM
• Description: IC REG BUCK 2A ADJ VOLT HE 8SOIC
• Manufacturer: Micrel Inc
• Series: SuperSwitcher™r
• Type: Step-Down (Buck)r

Specifications of MIC4684BM

• Mounting Type: Surface Mount
• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to 1.235V
• Current - Output: 2A
• Frequency - Switching: 200kHz
• Voltage - Input: 4 ~ 30 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): No
• Current Rating: 2A
• Output Voltage Max: 1.235V
• Supply Voltage Max: 30V
• Leaded Process Compatible: No
• Voltage Regulator Type: Switching
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant, Lead free / RoHS Compliant

Typical Characteristics
(T
January 2010
MIC4684
A
= 25°C unless otherwise noted)
100
200
180
160
140
120
100
100
10.9
10.8
10.7
10.6
10.5
10.4
10.3
95
90
85
80
75
70
65
60
55
50
90
80
70
60
50
40
30
20
10
80
60
40
20
5V
0
0
Efficiency vs. Output Current
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
0
0
0
V
OUT
with Feed Forward Diode
IN
V
V
V
IN
OUT
FB
5
0.5
= 8V
5
Minimum Duty Cycle
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Shutdown Current
Efficiency without Feed
V
= 12V
vs. Input Voltage
INPUT VOLTAGE (V)
= 1.3V
vs. Input Voltage
INPUT VOLTAGE (V)
IN
10 15 20 25 30 35 40
Forward Diode
10 15 20 25 30 35 40
= 5V
= 24V
1
1.5
V
IN
= 12V
V
IN
V
2
V
OUT
= 12V
EN
5V
3.3V
2.5V
1.8V
2.5
= 0V
= 5V
OUT
OUT
OUT
OUT
3
7
6
5
4
3
2
1
0
1.255
1.250
1.245
1.240
1.235
1.230
1.225
100
605
600
595
590
585
580
575
570
0
95
90
85
80
75
70
65
60
55
50
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
0
3.3V
0
V
5
Bootstrap Voltage
IN
vs. Input Voltage
INPUT VOLTAGE (V)
5
Feed Forward Diode
= 8V
OUTPUT CURRENT (A)
Saturation Voltage
OUT
5
vs. Input Voltage
INPUT VOLTAGE (V)
V
Reference Voltage
10 15 20 25 30 35 40
10
IN
vs. Input Voltage
INPUT VOLTAGE (V)
10 15 20 25 30 35 40
Efficiency without
= 24V
15
5
V
IN
V
V
20
= 12V
IN
FB
V
V
V
I
I
V
OUT
OUT
OUT
IN
OUT
OUT
= 12V
= 1.5V
= 12V
25
= 500mA
= 1A
= 3.3V
= V
= 5V
REF
30
6.3
6.2
6.1
5.9
5.8
5.7
100
350
300
250
200
150
100
51.5
50.5
49.5
48.5
95
90
85
80
75
70
65
60
55
50
50
6
51
50
49
0
0
0
0
0
V
Bootstrap Drive Current
OUT
2 4 6 8
5V
5
Quiescent Current
5
OUTPUT CURRENT (A)
Foldback Frequency
vs. Input Voltage
INPUT VOLTAGE (V)
V
IN
vs. Input Voltage
INPUT VOLTAGE (V)
10 15 20 25 30 35 40
= 3.3V
OUT
0.5
vs. Input Voltage
INPUT VOLTAGE (V)
10 15 20 25 30 35 40
Efficiency with Feed
Forward Diode
= 1.8V
10 12 14 16 18 20
1
V
V
V
IN
FB
OUT
V
V
V
IN
1.5
= 12V
EN
= 1.5V
FB
M9999-012610
= 5.0V
= 2.5V
= 5V
= 0V
Micrel, Inc.
2