MIC26903ZA Datasheet, PDF (5/28 Pages) Micrel Semiconductor – 28V, 9A Hyper Speed Control Synchronous DC/DC Buck Regulator

Micrel, Inc.
MIC26903-ZA
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
5
Short-Circuit Protection
Current-Limit Threshold
Current-Limit Threshold
Short-Circuit Current
Internal FETs
Top-MOSFET RDS (ON)
Bottom-MOSFET RDS (ON)
SW Leakage Current
VIN Leakage Current
Power Good (PG)
VFB = 0.6V, TJ = 25°C
VFB = 0.6V, TJ = 125°C
VFB = 0V
ISW = 3A
ISW = 3A
VEN = 0V
VEN = 0V
12.5 15
11.25 15
4
27
10.5
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
Overtemperature Shutdown
TJ Rising
160
Overtemperature Shutdown Hysteresis
15
Notes:
6. Measured in test mode.
7. The maximum duty-cycle is limited by the fixed mandatory OFF-time tOFF, typically 300ns.
Max.
0.6
30
750
20
20
60
25
95
200
Units
V
V
µA
kHz
%
%
ns
ms
A
A
A
mΩ
mΩ
µA
µA
%VOUT
%VOUT
µs
mV
°C
°C
May 29, 2013
5
Revision 1.0