MIC26903 Datasheet, PDF (5/31 Pages) Micrel Semiconductor – 28V, 9A Hyper Light Load Synchronous DC/DC Buck Regulator

Micrel, Inc.
MIC26903
Electrical Characteristics⁽⁵⁾ (Continued)
PV_IN = V_IN = V_EN = 12V, V_BST – V_SW = 5V; T_A = 25°C, unless noted. Bold values indicate −40°C ≤ T_J ≤ +125°C.
Parameter
Condition
Min.
Typ.
Soft-Start
Soft-Start time
5
Short-Circuit Protection
Current-Limit Threshold
V_FB = 0.8V, T_J = 25°C
12.5
15
Current-Limit Threshold
Short-Circuit Current
Internal FETs
V_FB = 0.8V, T_J = 125°C
V_FB = 0V
11.25
15
4
Top-MOSFET R_{DS (ON)}
Bottom-MOSFET R_{DS (ON)}
I_SW = 3A
I_SW = 3A
27
10.5
SW Leakage Current
V_EN = 0V
V_IN Leakage Current
Power Good (PG)
V_EN = 0V
PG Threshold Voltage
PG Hysteresis
PG Delay Time
Sweep V_FB from Low to High
Sweep V_FB from High to Low
Sweep V_FB from Low to High
85
92
5.5
100
PG Low Voltage
Sweep V_FB < 0.9 × V_NOM, I_PG = 1mA
70
Thermal Protection
Over-Temperature Shutdown
T_J Rising
160
Over-Temperature Shutdown
Hysteresis
15
Max. Units
ms
20
A
20
A
A
mΩ
mΩ
60
µA
25
µA
95
%V_OUT
%V_OUT
µs
200
mV
°C
°C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
3. The device is not guaranteed to function outside operating range.
4. PD_(MAX) = (T_J(MAX) – T_A)/ θ_JA, where θ_JA depends upon the printed circuit layout. A 5 square inch 4 layer, 0.62”, FR-4 PCB with 2oz finish copper weight
per layer is used for the θ_JA.
5. Specification for packaged product only.
6. Measured in test mode.
7. The maximum duty-cycle is limited by the fixed mandatory off-time t_OFF of typically 300ns.
July 2011
5
M9999-071311-A