MIC2125 Datasheet, PDF (4/34 Pages) Microchip Technology – 28V Synchronous Buck Controllers Featuring Adaptive ON-Time Control

MIC2125/6
TABLE 1-1: ELECTRICAL CHARACTERISTICS
Electrical Characteristics: V_IN = 12V, V_OUT = 1.2V, V_BST – V_SW = 5V; T_A = 25°C, unless noted. Bold values indicate
–40°C ≤ T_J ≤ +125°C. (Note 1).
Parameters
Min.
Typ.
Max.
Units
Conditions
Power Supply Input
Input Voltage Range (V_IN)
(Note 2)
Quiescent Supply Current
(MIC2125)
Quiescent Supply Current
(MIC2126)
Shutdown Supply Current
4.5
—
4.5
—
—
340
—
1.1
—
0.1
V_DD Supply
V_DD Output Voltage
V_DD UVLO Threshold
V_DD UVLO Hysteresis
Load Regulation
4.8
5.2
3.7
4.2
—
400
0.6
2
Reference
Feedback Reference Voltage
0.597
0.6
0.594
0.6
FB Bias Current
—
0.01
Enable Control
EN Logic Level High
EN Logic Level Low
EN Hysteresis
1.6
—
—
—
—
120
EN Bias Current
—
6
Oscillator
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Minimum On-Time
Minimum Off-Time
—
750
—
375
—
85
—
0
—
100
150
220
5.5
28
750
3
5
5.4
4.5
—
3.6
0.603
0.606
0.5
—
0.6
—
30
—
—
—
—
—
300
V
V_DD = V_IN
—
µA V_FB = 1.5V
mA V_FB = 1.5V
µA SW unconnected, V_EN = 0V
V
V_IN = 7V to 28V, I_DD = 10 mA
V_DD rising
mV —
%
I_DD = 0 to 40 mA
V
T_J = 25°C (±0.5%)
–40°C ≤ T_J ≤ +125°C (±1%)
µA V_FB = 0.6V
V
—
—
mV —
µA V_EN = 12V
kHz V_FREQ = V_IN
V_FREQ = 50% x V_IN
%—
V_FB > 0.6V
ns —
—
Soft-Start
Soft-Start Time
—
7
—
ms —
Short-Circuit Protection and OVP
Current-Limit Comparator
–15
–4
7
mV V_FB = 0.6V
Offset
Current-Limit Source Current
32
36
40
µA V_FB = 0.6V
Note 1: Specification for packaged product only.
2: The application is fully functional at low V_DD (supply of the control section) if the external MOSFETs have
low voltage V_TH.
DS20005459B-page 4
 2015 Microchip Technology Inc.