MIC2155_0911 Datasheet, PDF (8/35 Pages) Micrel Semiconductor – Two-Phase, Single-Output, PWM Synchronous Buck Control IC

Micrel, Inc.
MIC2155/2156
Electrical Characteristics⁽³⁾ cont.
T_J = 25°C; V_EN = V_IN1 = V_IN2 =12V; unless otherwise specified. Bold values indicate -40°C≤T_J≤+125°C
Parameter
Condition
Min Typ
Max
Units
Current Sense
CS Over Current Trip Point
Program Current
180 195 220 µA
CS Comparator Sense
Threshold
(Senses drop across low-side FET)
-10
0
+10 mV
Power Good
V_FB Threshold
PGOOD Voltage Low
Gate Drivers
V_FB = 0 V; I_PGOOD = 1mA
86 88.5 91 %Nom
0.225 0.3
V
Rise/Fall Time
Into 3000pF
Source
23
Sink
16
ns
High-Side Drive Resistance ^{VDD = VIN = 5V}
Source
Sink
1.6 3.5
Ω
1.7 2.5
Ω
Low-Side Drive Resistance ^{VDD = VIN = 5V}
Source
Sink
2
3.5
Ω
1.4 2.5
Ω
Driver Non-Overlap Time
(adaptive)
60
ns
Notes:
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating
the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, T_J(Max), the
junction-to-ambient thermal resistance, θ _JA, and the ambient temperature, T_A. The maximum allowable power dissipation will result in excessive die
temperature, and the regulator will go into thermal shutdown.
2. The device is not guaranteed to function outside its operating rating.
3. Specification for packaged product only.
4. Minimum on-time before automatic cycle skipping begins. See applications section.
November 2009
8
M9999-111209-B