STI8035 is a monolithic voltage regulator and interface IC, packaged in eSOP8EL, specifically designed to provide the 14/19V power supply with high fficiency and the 22kHz EXTM signaling to the LNB down-converter in the antenna dish or to the multi-switch box.
Function: 650mA LNB-Power Supply & Control Voltage Regulator
Package: eSOP8L package、eTSSOP14L package
Manufacturer: Sunto Semiconductor
Image
Description
STI8035 consists of a BOOST converter and a low-noise inear regulator along with
the circuitry required for EXTM injection and pin controllable interface. The device
makes the total LNB supply design simple, efficient and compact with low external
component count.
Features
1. Low noise output to avoid sensitivity of Can Tuner and DISH’s LNA dropping
down
2. Noise < +/-80mV@350MHz BWL，
3. Noise < +/-50mV@20MHz BWL
4. Single chip solution on 700mVpp 22KHz EXTM with 10μ s Trise/Tfall for less Transferring noise
5. LNB Voltages (2 levels: 14V and 19V) compatible with common
standards, Push-pull output stage minimizes 14→ 19V and 19V→ 14V
output transition times
Pinout
VIN 1 Power Supply input
VOUT 2 Output voltage for the LNB
BOOST 3 BOOST converter output voltage sense, and internal LDO’s input
terminal
VCP 4 Charge Pump for LDO supply
LX 5 DC-DC converter switch node connection, connects to inductor
EN 6 When this pin is low, the output is disabled. Setting EN = 1 enables the
output voltage
H_L 7 Output Voltage set input pin, high:19V, Low:14V
EXTM 8 22KHz EXTM signal input pin
GND 9 Power Ground (Exposed pad)
The external modulation input (EXTM pin) can accept a tome modulated DiSEqC
command and transfer it symmetrically to the output to meet DiSEqC 1.x protocol.
Applications
1. LNB Power supply For DVB-S/S2/ABS
2. Digital STB
3. Satellite TV cards
STI8035 Datasheet
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