MIC24055 Datasheet, PDF (5/29 Pages) Micrel Semiconductor – 12V, 12A High-Efficiency Buck Regulator

Micrel, Inc.
MIC24055
Electrical Characteristics⁽⁵⁾ (Continued)
PVIN = VIN = VEN = 12V, VBST – VSW = 5V; TA = 25°C, unless noted. Bold values indicate –40°C ≤ TJ ≤ +125°C.
Parameter
Condition
Min.
Typ.
Enable Control
EN Logic Level High
1.8
EN Logic Level Low
EN Bias Current
Oscillator
Switching Frequency ⁽⁶⁾
Maximum Duty Cycle ⁽⁷⁾
Minimum Duty Cycle
Minimum Off-Time
VEN = 12V
VFB = 0V
VFB = 1.0V
6
450
600
82
0
300
Soft-Start
Soft-Start time
3
Short-Circuit Protection
Peak Inductor Current-Limit
Threshold
Short-Circuit Current
Internal FETs
VFB = 0.8V, TJ = 25°C
VFB = 0.8V, TJ = 125°C
VFB = 0V
Top-MOSFET RDS (ON)
Bottom-MOSFET RDS (ON)
ISW = 3A
ISW = 3A
SW Leakage Current
VIN Leakage Current
Power Good (PG)
VEN = 0V
VEN = 0V
PG Threshold Voltage
PG Hysteresis
PG Delay Time
PG Low Voltage
Thermal Protection
Sweep VFB from Low to High
Sweep VFB from High to Low
Sweep VFB from Low to High
Sweep VFB < 0.9 × VNOM, IPG = 1mA
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
TJ Rising
Notes:
6. Measured in test mode.
7. The maximum duty-cycle is limited by the fixed mandatory off-time tOFF of typically 300ns.
18.75
21
17.36
21
12
13
5.3
85
92
5.5
100
70
160
15
Max.
0.6
30
750
38.5
38.5
60
25
95
200
Units
V
V
µA
kHz
%
%
ns
ms
A
A
mΩ
mΩ
µA
µA
%VOUT
%VOUT
µs
mV
°C
°C
December 2012
5
M9999-120712-A