MIC26903ZA_14 Datasheet, PDF (5/29 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
July 22, 2014
5
Revision 1.1