SI9161BQ-T1 Vishay, SI9161BQ-T1 Datasheet - Page 11

• Manufacturer Part Number: SI9161BQ-T1
• Description: IC, VOLTAGE MODE PWM CTRL, 6V, TSSOP-16
• Manufacturer: Vishay

Specifications of SI9161BQ-T1

• Input Voltage: 6V
• Output Voltage: 5.2V
• Output Current: 10mA
• Frequency: 2MHz
• Power Dissipation Pd: 925mW
• Supply Voltage Range: 2.7V To 6V
• Digital Ic Case Style: TSSOP
• No. Of Pins: 16
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-16
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Output Noise
The noise generated by a dc-dc converter is always an issue
within the mobile phone. The Si9161 offers two benefits.
1. The noise spectrum is a constant, i.e. no random noise or
2. The switching fundamental can be synchronized to a
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FIGURE 6. Efficiency of Si9161 and Si6801 Boost converter
random harmonic generation.
known frequency, e.g. 812.5 kHz which is
GSM/DCS system clock, or 1.23 MHz which is the channel
spacing frequency for CDMA, etc.
at various fixed frequencies
FIGURE 8. Spectrum response for the Si9161 demo board output voltage
-th of the
Figures 7 through 9 show the output noise and output
spectrum analysis.
Output Noise Spectrum
Note there is no random noise, only switching frequency
harmonics. This is very good news for the RF stages, where
an unknown, or random noise spectrum will cause problems.
FIGURE 7. Output noice of the Si9160 demo board
Vishay Siliconix
S-60752—Rev. B, 05-Apr-99
Si9161
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