MIC2101_13 Datasheet, PDF (5/36 Pages) Micrel Semiconductor – 38V, Synchronous Buck Controllers Featuring Adaptive On-Time Control

Micrel, Inc.
Electrical Characteristics⁽4⁾ (Continued)
VIN = 12V, VOUT = 1.2V; VBST – VSW = 5V; TA = 25°C, unless noted. Bold values indicate ƒ&”7J ”ƒ&
Parameter
Condition
Min.
Typ.
Max.
Oscillator
Switching Frequency
Maximum Duty Cycle
VFREQ = VIN
VFREQ = 50%VIN
400
600
750
300
85
Minimum Duty Cycle
Minimum Off-Time
VFB > 0.8V
0
140
200
260
Soft-Start
Soft-Start time
5
Short-Circuit Protection
Current-Limit Threshold
VFB = 0.79V
30
14
0
Short-Circuit Threshold
Current-Limit Source Current
Short-Circuit Source Current
FET Drivers
VFB = 0V
VFB = 0.79V
VFB = 0V
23
7
9
60
80
100
27
37
47
DH, DL Output Low Voltage
ISINK = 10mA
0.1
DH, DL Output High Voltage
DH On-Resistance, High State
ISOURCE = 10mA
VPVDD  0.1V
or
VBST  0.1V
2.1
3.3
DH On-Resistance, Low State
1.8
3.3
DL On-Resistance, High State
1.8
3.3
DL On-Resistance, Low State
1.2
2.3
SW, BST Leakage Current
50
Power Good (PG)
PG Threshold Voltage
PG Hysteresis
PG Delay Time
PG Low Voltage
Thermal Protection
Sweep VFB from Low to High
85
Sweep VFB from High to Low
Sweep VFB from Low to High
VFB < 90% x VNOM, IPG = 1mA
90
95
6
100
70
200
Over-Temperature Shutdown
TJ Rising
160
Over-Temperature Shutdown Hysteresis
7
MIC2101/02
Units
kHz
%
%
ns
ms
mV
mV
μA
μA
V
V
Ÿ
Ÿ
Ÿ
Ÿ
μA
%VOUT
%VOUT
μs
mV
°C
°C
November 13, 2013
5
Revision 2.0