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LM5165 Datasheet(PDF) 16 Page - Texas Instruments

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Part # LM5165
Description  LM5165-Q1 Automotive 3-V to 65-V Input, 150-mA Synchronous Buck Converter With Ultra-Low IQ
PDF  52 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM5165 Datasheet(HTML) 16 Page - Texas Instruments

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t
VREF
I
OUT2
Inductor
Current
FB Voltage
(internal)
I
OUT1
CCM
Operation
DCM
Operation
VOUT
SW
Voltage
Extended
On-Time
VIN
SLEEP
ACTIVE
ACTIVE
SLEEP
4 mV
Figure 7-4. COT Mode SW Node Voltage, Feedback Voltage, and Inductor Current Waveforms
The required on-time adjust resistance for a particular frequency is given in Equation 2 and tabulated in Table
7-1. The maximum programmable on-time is 15 µs.
4
OUT
RT
SW
V
V
10
R
k
F
kHz
1.75
ª º
¬ ¼
:
˜
ª
º
¬
¼
ª
º
¬
¼
(2)
Table 7-1. On-Time Adjust Resistance (E96 EIA Values) for Various Switching
Frequencies and Output Voltages
FSW (kHz)
RRT (kΩ)
VOUT = 1.8 V
VOUT = 3.3 V
VOUT = 5 V
VOUT = 12 V
100
102
187
287
681
200
51.1
95.3
143
240
300
34
63.4
95.3
226
400
25.5
47.5
71.5
169
500
20.5
37.4
57.6
137
600
16.9
31.6
47.5
115
The choice of control mode and switching frequency requires a compromise between conversion efficiency,
quiescent current, and passive component size. Lower switching frequency implies reduced switching losses
(including gate charge losses, transition losses, and so forth) and higher overall efficiency. Higher switching
frequency, on the other hand, implies a smaller LC output filter and hence a more compact design. Lower
inductance also helps transient response as the large-signal slew rate of inductor current increases. The ideal
switching frequency in a given application is a tradeoff and thus is determined on a case-by-case basis. It relates
to the input voltage, output voltage, most frequent load current level(s), external component choices, and circuit
size requirement. At light loads, the PFM converter has a relatively longer sleep time interval and thus operates
with lower input quiescent current and higher efficiency.
LM5165-Q1
SNVSAJ3C – MARCH 2016 – REVISED DECEMBER 2022
www.ti.com
16
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Copyright © 2022 Texas Instruments Incorporated
Product Folder Links: LM5165-Q1



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