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ISL9120 Datasheet(PDF) 9 Page - Renesas Technology Corp

Part No. ISL9120
Description  Compact High Efficiency Low Power Buck-Boost Regulator
Download  13 Pages
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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ISL9120 Datasheet(HTML) 9 Page - Renesas Technology Corp

 
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ISL9120
FN8659 Rev.2.00
Page 9 of 13
May 23, 2017
Variable Peak Current Limit Scheme
To optimize efficiency across the output current range, the ISL9120
implements a multilevel current limit scheme with 32 levels
between 350mA and 2A. The transition from one level to the other
is determined by the number of pulses in a PFM burst (pulse count)
as shown in Figure 16. At a given peak current limit level, the pulse
count increases as the output current increases. When the pulse
count reaches the upper threshold at the existing current limit, the
current limit will switch to the next higher level. Similarly, if the pulse
count reaches the lower threshold at the existing current limit, the
device will switch to the next lower level of peak current limit. If the
pulse count reaches the upper threshold at the highest current limit,
the current limit will not rise any further. Increasing the output
current beyond this point may cause the output to lose voltage
regulation.
FIGURE 15. PFM MODE OPERATION CONCEPT
FIGURE 16. PEAK CURRENT LIMIT STEP UP TRANSITION
IL
VOUT
0
1.015 * VOUT_NOMINAL
VOUT_NOMINAL
PEAK CURRENT LIMIT
IL
IOUT
0
IPK_LMT2
IPK_LMT1
INCREASING IOUT
tMIN


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