Datasheet

DS
GC1
TPS43330-Q1
or
TPS43332-Q1
V
IN
V
BAT
R
IFLT
C
IFLT
R
ISEN
TPS43330-Q1
TPS43332-Q1
SLVSA82E –MARCH 2011–REVISED APRIL 2013 www.ti.com
Figure 22. External Current Shunt Resistor
Frequency-Hopping Spread Spectrum
The TPS43332-Q1 features a frequency-hopping pseudo-random spectrum-spreading architecture. On this
device, whenever the SYNC pin is high, the internal oscillator frequency varies from one cycle to the next within
a band of ±5% around the value programmed by the resistor at the RT pin. The implementation uses a linear-
feedback shift register that changes the frequency of the internal oscillator based on a digital code. The shift
register is long enough to make the hops pseudo-random in nature and has a design such that the frequency
shifts only by one step at each cycle to avoid large jumps in the buck and boost switching frequencies.
Table 1. Frequency-Hopping Control
SYNC
Frequency Spread Spectrum (FSS) Comments
Terminal
Device in forced continuous mode, internal PLL locks into external clock
External clock Not active
between 150 kHz and 600 kHz.
Device can enter discontinuous mode. Automatic LPM entry and exit,
Low or open Not active
depending on load conditions
TPS43330-Q1: FSS not active
High Device in forced continuous mode
TPS43332-Q1: FSS active
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