MIC2128 Datasheet, PDF (4/32 Pages) Microchip Technology – 75V, Synchronous Buck Controller Featuring Adaptive On-Time Control with External Soft Start

MIC2128
ELECTRICAL CHARACTERISTICS (Note 1)
Electrical Specifications: unless otherwise specified, V_IN = 12V, V_OUT = 1.2V; V_BST - V_SW = 5V, T_A = +25°C.
Boldface values indicate -40°C  T_J  +125°C (Note 2).
Parameter
Symbol
Min. Typ. Max. Units
Test Conditions
Power Supply Input
Input Voltage Range
V_VIN
4.5
—
5.5
V P_VDD and V_DD shorted to V_IN
(V_PVDD = V_VIN = V_VDD)
5.5
—
75
Quiescent Supply Current
Shutdown Supply Current
I_Q
I_VIN(SHDN)
—
1.4
1.8
mA V_FB = 1.5V, no switching
—
0.1
5
µA EN = Low
—
30
60
µA EN = Low, V_IN = V_DD = 5.5V
PVDD,VDD and EXTVDD
P_VDD Output Voltage
V_PVDD
4.8
V_DD UVLO Threshold
V_{VDD_UVLO_Rise}
3.7
V_DD UVLO Hysteresis
V_{VDD_UVLO_Hys}
—
EXTVDD Bypass Threshold
V_{EXTVDD_Rise}
4.4
EXTVDD Bypass Hysteresis
V_{EXTVDD_Hys}
—
EXTVDD Dropout Voltage
—
5.1 5.4
V V_VIN = 7V to 75V,
I_PVDD = 10 mA
4.2 4.5
V V_DD rising
600
—
mV V_DD falling
4.6 4.85
V EXTVDD rising
200
—
mV
250
—
mV V_EXTVDD = 5V, I_PVDD = 25mA
Reference
Feedback Reference Voltage
FB Bias Current
V_REF
I_FB
0.597 0.6 0.603 V T_J = 25°C
0.594 0.6 0.606 V -40°C  T_J 125°C
—
50
500
nA V_FB = 0.6V
Enable Control
EN Logic Level High
EN Logic Level Low
EN Hysteresis
EN Bias Current
V_{EN_H}
V_{EN_L}
V_{EN_Hys}
I_EN
1.6
—
—
V
—
—
0.6
V
—
150
—
mV
—
6
30
µA V_EN = 12V
ON Timer
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Minimum ON Time
Minimum OFF Time
f₀
D_MAX
D_MIN
t_ON(MIN)
t_OFF(MIN)
—
800
—
kHz V_FREQ = V_VIN, V_VIN = 12V
230 270 300
V_FREQ = 33% of V_VIN,
V_VIN = 12V
—
85
—
% V_FREQ = V_VIN = 12V
—
0
—
% V_FB > 0.6V
—
80
—
ns
150 230 350 ns
Soft-Start
Soft-Start Current Source
I_SS
—
1.3
—
µA
Current Limit
Current-Limit Comparator
Offset
V_OFFSET
-15
0
15
mV V_FB = 0.59V
I_LIM Source Current
I_CL
I_LIM Source Current Tempco
Negative Current Limit
—
Comparator Threshold
80
96
110
µA V_FB = 0.59V
—
0.3
— µA/°C
—
48
—
mV
Note 1:
2:
Specification for packaged product only.
The application is fully functional at low V_DD (supply of the control section) if the external MOSFETs have
low voltage V_TH.
DS20005620A-page 4
 2016 Microchip Technology Inc.