MIC2174_10 Datasheet, PDF (5/27 Pages) Micrel Semiconductor – Synchronous Buck Controller Featuring Adaptive On-Time Control 40V Input, 300kHz

Micrel, Inc.
Electrical Characteristics⁽⁴⁾
V_BST − V_LX = 5V; T_A = 25°C, unless noted. Bold values indicate −40°C ≤ T_J ≤ +125°C.
Parameter
Condition
Soft-Start
Soft-Start Period
Oscillator
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
FET Drives
MIC2174
MIC2174C
Measured at DH ⁽⁷⁾
MIC2174C
Measured at DH, V_FB = 1V
DH, DL Output Low Voltage
I_SINK = 10mA
DH, DL Output High Voltage
I_SOURCE = 10mA
DH On-Resistance, High State
DH On-Resistance, Low State
DL On-Resistance, High State
DL On-Resistance, Low State
LX Leakage Current
HSD Leakage Current
Thermal Protection
V_LX = 40V, V_IN = 5.5V,V_BST = 45.5V
V_LX = 40V, V_IN = 5.5V,V_BST = 45.5V
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
Shutdown Control
EN Logic Level Low
EN Logic Level High
EN Pull-Up Current
3V < V_IN <5.5V
3V < V_IN <5.5V
Note:
7. The maximum duty cycle is limited by the fixed mandatory off time T_OFF of typical 363ns.
MIC2174/MIC2174C
Min.
Typ. Max. Units
6
ms
0.225
0.202
0.3 0.375
MHz
0.27 0.338
87
%
87
0
%
0.1
V
V_IN-0.1V
or
V
V_BST-0.1V
2.1 3.3
Ω
1.8 3.3
Ω
1.8 3.3
Ω
1.2 2.3
Ω
55
µA
21
µA
155
°C
10
°C
0.4
0.8
V
0.9 1.2
V
50
µA
September 2010
5
M9999-091310-C