MIC4684BM Micrel Inc, MIC4684BM Datasheet - Page 3

• 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

Absolute Maximum Ratings
Supply Voltage (V
Enable Voltage (V
Steady-State Output Switch Voltage (V
Feedback Voltage (V
Storage Temperature (T
ESD Rating ............................................................... Note 3
Electrical Characteristics
V
Parameter
Feedback Voltage
Feedback Bias Current
Maximum Duty Cycle
Output Leakage Current
Quiescent Current
Bootstrap Drive Current
Bootstrap Voltage
Frequency Fold Back
Oscillator Frequency
Saturation Voltage
Short Circuit Current Limit
Shutdown Current
Enable Input Logic Level
Enable Pin Input Current
Thermal Shutdown @ T
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
January 2010
MIC4684
IN
= V
EN
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
2.5V of headroom is required between V
to 3.3V circuit on page 1.
Measured on 1” square of 1 oz. copper FR4 printed circuit board connected to the device ground leads.
= 12V, V
OUT
IN
EN
), Note 3 ....................................... +34V
)......................................–0.3V to +V
FB
= 5V; I
J
) .............................................. +12V
S
) ........................ –65°C to +150°C
OUT
= 500mA; T
Condition
(±2%)
(±3%)
8V ≤ V
V
V
V
V
V
I
V
I
V
V
regulator on
regulator off
V
V
BS
OUT
FB
IN
IN
FB
FB
FB
FB
EN
EN
EN
= 10mA, V
= 30V, V
= 30V, V
= 0V
= 1.0V
= 1.5V
= 1.5V, V
= 0V, See Test Circuit
= 0V
= 0V (regulator off)
= 12V (regulator on)
= 1A
IN
SW
(Note 1)
IN
≤ 30V, 0.1A ≤ I
A
) .........–1V to V
and V
= 25°C, unless otherwise noted. Bold values indicate –40°C ≤ T
EN
EN
SW
FB
= 0V, V
= 0V, V
OUT
= 0V
= 1.5V, V
. The headroom can be reduced by implementing a feed-forward diode a seen on the 5V
SW
SW
LOAD
= 0V
= –1V
SW
IN
IN
≤ 1A, V
= 0V
3
Operating Ratings
Supply Voltage (V
Ambient Temperature (T
Junction Temperature (T
Package Thermal Resistance
θ
θ
OUT
JA
JC
, Note 5 .......................................................... 75°C/W
, Note 5 .......................................................... 25°C/W
= 5V
IN
) Note 4 ............................ +4V to +30V
A
J
) .......................... –40°C to +85°C
) ........................ –40°C to +125°C
(Note 2)
1.210
1.198
1.186
1.173
Min
250
180
5.5
2.2
30
–1
2
1.235
1.235
–0.83
0.59
Typ
380
200
150
160
J
1.4
6.2
50
94
50
16
5
6
≤ +125°C.
1.260
1.272
1.284
1.297
M9999-012610
Max
500
120
225
0.8
20
12
50
Micrel, Inc.
Units
kHz
kHz
mA
mA
mA
mA
µA
µA
µA
nA
°C
%
V
V
V
V
V
V
A
V
V