MIC2111B Datasheet, PDF (4/35 Pages) Micrel Semiconductor – High-Performance, Multi-Mode, Step-Down Controller

Micrel, Inc.
MIC2111B
Pin Description (Continued)
Pin Number I/O Pin Name Pin Name
Low-Side Logic Output. Connect this pin to module-mode pin for outside audio operation.
9
I/O
LS
Leave this pin open if outside audio (>25kHz) operation is not required. Current limit can be
adjusted by connecting a resistor from LS to AGND (see Table 1 for details).
10
O
HS
High-Side Logic of Power Module Top FET. Connect this pin to the PWM pin of power module.
This pin has tri-state capability.
11
P
VCC
5V Supply Input. A 1μF ceramic capacitor from VCC to AGND is required for decoupling.
12
P
AGND Analog Ground.
13
I
ISEN− Negative pin of the inductor current-sense input.
14
I
ISEN+ Positive pin of the inductor current-sense input.
Bi-Directional Pin. This pin goes low if controller or module is not ready. This pin goes low if
15
I/O FAULTb V_CC is less than UVLO, or if a TJ or OVP fault is triggered. Either VCC cycling or EN cycling is
required to clear the fault. This pin has an internal 100kΩ pull-up resistor to VCC
16
I
RS+
The non-inverting input of the remote sensing amplifier. Remote sense for output voltage.
17
I
RS-
The inverting input of the remote sensing amplifier. Remote sense for GND.
18
O
VDIFF Output of differential amplifier. Connect a resistor divider from VDIFF to set output voltage
19
I
FB
The inverting input of the error amplifier.
20
I/O
COMP
Transconductance Amplifier Output. Connect compensation network from COMP node for
frequency response.
October 13, 2015
4
Revision 2.1