MIC2128 Datasheet, PDF (7/32 Pages) Microchip Technology – 75V, Synchronous Buck Controller Featuring Adaptive On-Time Control with External Soft Start

MIC2128
Note: Unless otherwise indicated, V_VIN = 12V, f_SW = 300 kHz, R_ILIM = 1.5 k, L = 10 µH, V_EXTVDD = V_OUT, T_A = +25°C
(refer to the Typical Application circuit).
5.2
5
EXTVDD = GND
V_EXTVDD = 12V
4.8
4.6
V_EXTVDD = 5V
4.4
4.2
V_VIN = 48V
V_EN = V_VIN
4
0
10
20
30
40
50
60
I_PVDD (mA)
FIGURE 2-7:
PVDD Load Regulation.
1.6
1.4
V_EN rising
1.2
1.0
V_EN falling
0.8
0.6
-50 -25
0
25 50 75
Temperature (°C)
100 125
FIGURE 2-10:
Temperature.
Enable Threshold vs.
4.5
4.3
4.1
3.9
3.7
3.5
3.3
3.1
-50
V_VDD rising
V_VDD falling
I_VDD = 0 mA
EXTVDD = GND
-25
0
25 50 75 100 125
Temperature (°C)
FIGURE 2-8:
Temperature.
VDD UVLO Threshold vs.
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
-50 -25
FIGURE 2-11:
Temperature
V_VIN = 12V
V_EN = 5V
0
25 50 75
Temperature (°C)
100 125
Enable Bias Current vs.
4.8
4.7
4.6
4.5
4.4
4.3
4.2
-50
V_EXTVDD rising
V_EXTVDD falling
-25
0
25 50 75
Temperature (°C)
100 125
FIGURE 2-9:
Temperature.
EXTVDD Threshold vs.
320
310
300
290
280
270
260
250
240
230
220
6
I_OUT = 5A
I_OUT = 0A
V_OUT = 5V
F_{SW_SETPOINT} = 300 kHz
V_EXTVDD = V_OUT
V_EN = V_VIN
12 18 24 30 36 42 48 54 60 66 72 78
Input Voltage (V)
FIGURE 2-12:
Input Voltage.
Switching Frequency vs.
 2016 Microchip Technology Inc.
DS20005620A-page 7