MIC27600_11 Datasheet, PDF (5/28 Pages) Micrel Semiconductor – 36V, 7A Hyper Speed Control™ Synchronous DC-DC Buck Regulator

Micrel, Inc.
MIC27600
Electrical Characteristics⁽⁵⁾ (Continued)
PV_IN = V_IN = 12V, 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 ⁽⁶⁾
Maximum Duty Cycle ⁽⁷⁾
V_FB = 0V
225
300
87
Minimum Duty Cycle
V_FB > 0.8V
0
Minimum Off-time
360
Soft-Start
Soft-Start time
6
Short Circuit Protection
Current-Limit Threshold
Short-Circuit Current
Internal FETs
V_FB = 0.8V
V_FB = 0V
Top-MOSFET R_{DS (ON)}
Bottom-MOSFET R_{DS (ON)}
I_SW = 1A
I_SW = 1A
SW Leakage Current
V_IN Leakage Current
Thermal Protection
V_IN = 36V, V_SW = 36V, V_EN = 0V, V_BST = 41V
V_IN = 36V, V_SW = 0V, V_EN = 0V, V_BST = 41V
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
T_J Rising
Notes:
6. Measured in test mode.
7. The maximum duty-cycle is limited by the fixed mandatory off-time t_OFF of typically 360ns.
7.7
15
6
25
10
155
10
Max.
375
60
25
Units
kHz
%
%
ns
ms
A
A
mΩ
mΩ
µA
µA
°C
°C
July 2011
5
M9999-070811