mic4684 Micrel Semiconductor, mic4684 Datasheet - Page 3

• Manufacturer Part Number: mic4684
• Description: Mic4684 2a High-efficiency Buck Regulator
• Manufacturer: Micrel Semiconductor

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.
February 2005
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
Max
500
120
225
0.8
20
12
50
M9999-021705
Micrel, Inc.
Units
kHz
kHz
mA
mA
mA
mA
µA
µA
µA
nA
°C
%
V
V
V
V
V
V
A
V
V