MIC7401 Datasheet, PDF (40/68 Pages) Micrel Semiconductor – Configurable PMIC, Five-Channel Buck Regulator plus One-Boost with HyperLight Load®, I2C Control, and Enable

Micrel, Inc.
MIC7401
Proper Termination of Unused Pins
Many designs will not require all six DC-to-DC output
voltages. In these cases, the unused pin must be
connected to either V_IN or GND.
The schematic in Figure 21 shows where to tie the unused
pins and Table 4 summarizes the connections.
VOUT3
R7
0Ω
R1
100kΩ
PG
C1
2.2µF
VIN
C15
150µF
R6
499kΩ
VIN
EN
EN
VIN
+
PGND
VIN
VOUT2
1.1V/0.5A
PGND
VIN
VOUT3
1.8V/0.5A
PGND
VIN
VOUT4
1.05V/2.5A
PGND
C9
10µF
C10
22µF
C11
10µF
C12
22µF
C13
10µF
C14
22µF
L2
2.2µH
2 _PVIN2
1 _SW2
3 _OUT2
36 _PGND2
L3
2.2µH
4 _PVIN3
5 _SW3
7 _OUT3
6 _PGND3
L4
1.0µH
8 _PVIN4
9 _SW4
11 _OUT4
10 _PGND4
VIN
R4
100kΩ
MIC7401
VIN
STAND-BY
STAND-BY
POR
PG
EN
SDA ⁴
CLK ³
NC ²
GND ¹
PVIN1 ²⁶
VIN
OUT1 ²⁹
SW1 ²⁷
PGND1 ²⁸
PVIN6 ²⁵
VIN
PVIN6O ²⁴
SW6 ²³
PGND6 ²²
OUT6 ²¹
PVIN5 ²⁰
SW5 ¹⁹
OUT5 ¹⁷
PGND5 ¹⁸
L5
2.2µH
VIN
C7
10µF
C8
22µF
TP14
R5
R3
2kΩ 2kΩ
VIN
VOUT5
1.25V/1.0A
PGND
Figure 21. Connections for Unused Pins
Table 4. Summarization of Unused Pin Connections
Unused
VIN
Boost
PVIN6, PGIN6O, VOUT6
Buck
PVIN[x], VOUT[x]
POR
PGND
PGND6, SW6
PGND[6], SW[x]
POR
March 16, 2015
40
Revision 1.0