LNBH25 STMicroelectronics, LNBH25 Datasheet - Page 2

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LNBH25

Manufacturer Part Number
LNBH25
Description
LNB supply and control IC with step-up and I2C interface
Manufacturer
STMicroelectronics
Datasheet

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Contents
Contents
1
2
3
4
5
6
2/34
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
2.12
2.13
2.14
2.15
2.16
2.17
2.18
2.19
2.20
2.21
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Typical application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
I²C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
DiSEqC data encoding (DSQIN pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Data encoding by external 22 kHz tone TTL signal . . . . . . . . . . . . . . . . . . 4
Data encoding by external DiSEqC envelope control
through the DSQIN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LPM (low power mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DiSEqC 2.0 implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Output current limit selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Output voltage selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Diagnostic and protection functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Surge protections and TVS diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
FLT: fault flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
VMON: output voltage diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
TMON: 22 kHz tone diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
TDET: 22 kHz tone detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
IMON: minimum output current diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . 8
PDO: overcurrent detection on output pull-down stage . . . . . . . . . . . . . . . 8
Power-on I²C interface reset and undervoltage lockout . . . . . . . . . . . . . . . 8
PNG: input voltage minimum detection . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ISW: inductor switching current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
COMP: boost capacitor ESR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
OLF: overcurrent and short-circuit protection and diagnostic . . . . . . . . . . . 9
OTF: thermal protection and diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Doc ID 022433 Rev 4
LNBH25

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