MIC25400 Datasheet, PDF (5/27 Pages) Micrel Semiconductor – 2A Dual Output PWM Synchronous Buck Regulator IC

Micrel, Inc.
MIC25400
Parameter
Condition
Min
Oscillator / PWM
Switching Frequency
0.8
Maximum Duty-cycle
70
Minimum On-Time
I_LOAD > 200mA ⁽⁵⁾
Error Amplifier (each channel)
DC Gain
High-side internal MOSFET
On Resistance RDS(ON)
Low-side MOSFET driver
I_FET = 1A, V_FB=0.8V
DH On-Resistance
DH Transition Time
Pull Up, I_SOURCE = 10mA
Pull Down; I_SINK = 10mA
Into 1000pF
Into 1000pF
Driver Non-overlap Dead Time (Adaptive)
EN/DLY and soft-start control
EN/DLY Pull-up Current
V_EN/DLY=0V
5.0
P_VDD Threshold
P_VDD turns on
0.3
Soft-start Begins Threshold
Channel soft-start begins
1
Soft-start Ends Threshold
Channel soft-start ends
2
Power Good
PG Threshold Voltage
V_OUT Rising (% of V_OUT nominal)
86
PG Output Low Voltage
V_FB = 0V, I_PG = 1mA
PG Leakage Current
V_FB = 800mV, V_PG = 5.5V
Thermal Protection
Over-temperature Shutdown
Over-temperature Shutdown
Hysteresis
T_J Rising
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
5. Minimum on-time before automatic cycle skipping begins. See applications section.
Typ
1
75
15
68
150
4
2.5
12
9
25
6.5
0.4
1.35
2.4
90
0.24
5
172
22
Max Units
1.2
MHz
%
ns
dB
mΩ
Ω
Ω
ns
ns
ns
8.0
µA
0.6
V
1.8
V
2.8
V
94 %Nom
0.3
V
nA
°C
°C
January 2011
5
M9999-020111-C