MIC28510_12 Datasheet, PDF (5/30 Pages) Micrel Semiconductor – 75V/4A Hyper Speed Control Synchronous DC/DC Buck Regulator

Micrel, Inc.
MIC28510
Electrical Characteristics⁽⁵⁾ (Continued)
PV_IN = V_FS = 48V, V_DD = 5V; V_BST – V_SW = 5V; T_A = 25°C, unless noted. Bold values indicate 40°C ≤ T_J ≤ +125°C.
Parameter
Condition
Min.
Typ.
Oscillator
Switching Frequency
Maximum Duty Cycle ⁽⁶⁾
Minimum Duty Cycle
Minimum Off-time
V_FS = PV_IN
V_FB = 0V, V_FS=PV_IN
V_FB > 0.8V
375
500
80
0
360
Soft-Start
Soft-Start time
6
Short-Circuit Protection
Current–Limit Threshold
Short–Circuit Current
Internal FETs
Top–MOSFET R_{DS (ON)}
Bottom–MOSFET R_{DS (ON)}
SW Leakage Current
PV_IN Leakage Current
Thermal Protection
Over–Temperature Shutdown
Over–Temperature Shutdown
Hysteresis
V_FB = 0.8V, T_J = 25°C
V_FB = 0.8V, T_J = 125°C
V_FB = 0V
I_SW = 1A
I_SW = 1A
PV_IN = 36V, V_SW = 36V, V_EN = 0V, V_BST = 41V
PV_IN = 36V, V_SW = 0V, V_EN = 0V, V_BST = 41V
T_J Rising
Note:
6. The maximum duty–cycle is limited by the fixed mandatory off-time (t_OFF ) of typically 360ns.
4.8
7
4
2
4.3
31
31
160
2
Max.
625
10
10
5.7
55
55
Units
kHz
%
%
ns
ms
A
A
mΩ
mΩ
µA
µA
°C
°C
March 2012
5
M9999-030912-A