MIC45404 Datasheet, PDF (13/32 Pages) Microchip Technology – 19V 5A Ultra-Low Profile DC-to-DC Power Module

MIC45404
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
MIC45404
Symbol
1, 54
2
3
4
5, 6
7, 8
9, 23, 24, 50, 51
11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21
10, 22, 25, 40
26, 27, 28, 29, 30, 31, 32, 33,
34, 35, 36, 37, 38, 39
41, 42
43
44
45
46, 47
48
49
52
53
55
OUTSNS
EN/DLY
V_DDP
V_DDA
GND_EXT
V_IN
GND
OUT
KEEPOUT
LX
BST
PG
VOSET0
VOSET1
NC
I_LIM
FREQ
A_GND
COMP
GND_EP
Pin Function
Output Sensing Pin
Precision Enable/Turn-On Delay Input Pin
MOSFET Drivers Internal Supply Pin
Internal LDO Output and Analog Supply Pin
Ground Extension Pins
Input Voltage Pins
Power Ground Pins
Output Side Connection Pins
Depopulated Pin Positions
Switch Node Pins
Bootstrap Capacitor Pin
Power Good Output Pin
Output Voltage Selection Pins
Not Connected Pins
Current Limit Selection Pin
Switching Frequency Selection Pin
Analog Ground Pin
Compensation Network Pin
Ground Exposed Pad.
3.1 Output Sensing Pins (OUTSNS)
Connect these pins directly to the Buck Converter
output voltage. These pins are the top side terminal of
the internal feedback divider.
3.2 Precision Enable/Turn-On Delay
Input Pin (EN/DLY)
The EN/DLY pin is first compared against a 515 mV
threshold to turn on the on-board LDO regulator. The
EN/DLY pin is then compared against a 1.21V (typical)
threshold to initiate output power delivery. A 150 mV
typical hysteresis prevents chattering when power
delivery is started. A 2 µA (typical) current source pulls
up the EN/DLY pin. Turn-on delay can be achieved by
connecting a capacitor from EN/DLY to ground, while
using an open-drain output to drive the EN/DLY pin.
3.3 MOSFET Drivers Internal
Supply Pin (V_DDP)
Internal supply rail for the MOSFET drivers, fed by the
V_DDA pin. An internal resistor (10) between the V_DDP
and V_DDA pins, and an internal decoupling capacitor
are provided in the module in order to implement an RC
filter for switching noise suppression.
3.4 Internal Regulator Output Pin
(V_DDA)
Output of the internal linear regulator and internal
supply for analog control. A 1 µF minimum ceramic
capacitor should be connected from this pin to GND; a
2.2 µF nominal value is recommended.
 2015 Microchip Technology Inc.
DS20005478A-page 13