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LTC7802EUFDM Datasheet(PDF) 31 Page - Analog Devices

Part # LTC7802EUFDM
Description  40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum
PDF  34 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC7802EUFDM Datasheet(HTML) 31 Page - Analog Devices

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LTC7802
31
Rev. 0
For more information www.analog.com
TYPICAL APPLICATIONS
Figure 10. 2.25MHz 2-Phase Single Output 3.3V, 24A Step-Down Regulator
D1
MTOP1
3m
MBOT1
0.1µF
1nF
1nF
L1, 0.16µH
7802 F10a
LTC7802
RUN1
RUN2
VFB2
MODE
FREQ
INTVCC
INTVCC
VIN
VIN
4.5V TO 38V
12V NOMINAL
VOUT
3.3V, 24A
SENSE1–
BOOST2
EXTVCC
VFB1
TG2
SW2
BG2
ITH1
TRACK/SS1
PGOOD1
PGOOD2
ITH2
TRACK/SS2
PLLIN/SPREAD
SENSE1+
SW1
BG1
TG1
BOOST1
GND
210k
68.1k
0.1µF
47pF
470pF
6k
3m
SENSE2+
SENSE2–
100µF
10µF
+
INTVCC
VIN
D2
MTOP2
MBOT2
0.1µF
L2, 0.16µH
INTVCC
VIN
COUT
470µF
4V
4.7µF
×6
+
4.7µF
150
150
fSW = 2.25MHz
MTOP1,2: INFINEON BSC059N04LS6
MBOT1,2: INFINEON BSC022N04LS6
L1,2: COILCRAFT XAL5030-161ME
D1,2: INFINEON BAS140WE6327HTSA1
COUT: KEMET T520D477M004ATE012
VIN = 15V
0A TO 15A LOAD STEP
10µs/DIV
7802 F10b
VOUT
200mV/DIV
INDUCTOR L1
CURRENT
10A/DIV
INDUCTOR L2
CURRENT
10A/DIV
FORCED CONTINUOUS OPERATION
VIN = 8V
VIN = 12V
VIN = 24V
LOAD CURRENT (A)
0
5
10
15
20
25
30
65
70
75
80
85
90
95
Efficiency vs Load Current
7802 F10c
DETECTOR = PEAK-HOLD
RBW = 9.1kHz
PLLIN/SPREAD = GND
PLLIN/SPREAD = INTVCC
FREQUENCY (MHz)
1
2
3
4
5
6
7
8
9
10
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
Output Voltage Noise Spectrum
7802 F10d
Load Step Transient Response
Efficiency vs Load Current
Output Voltage Noise Spectrum



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