MIC24054 Datasheet, PDF (5/30 Pages) Micrel Semiconductor – 12V, 9A High-Efficiency Buck Regulator

Micrel, Inc.
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
VOUT = 2.5V
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
12.5
14
11.25
8
Top-MOSFET RDS (ON)
Bottom-MOSFET RDS (ON)
ISW = 3A
ISW = 3A
27
10.5
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
85
92
5.5
100
70
Over-Temperature Shutdown
TJ Rising
160
Over-Temperature Shutdown Hysteresis
15
Notes:
6. Measured in test mode.
7. The maximum duty-cycle is limited by the fixed mandatory off-time tOFF of typically 300ns.
MIC24054
Max. Units
V
0.6
V
30
µA
750
kHz
%
%
ns
ms
20
A
A
mΩ
mΩ
60
µA
25
µA
95
%VOUT
%VOUT
µs
200
mV
°C
°C
October 2012
5
M9999-102512-A