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LTC7803 Datasheet(PDF) 39 Page - Analog Devices

Part # LTC7803
Description  40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller
PDF  44 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC7803 Datasheet(HTML) 39 Page - Analog Devices

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LTC7817
39
Rev 0
For more information www.analog.com
TYPICAL APPLICATIONS
Figure 11. High Efficiency 380kHz Wide Input Range 24V/2A Boost and Two-Phase 5V/30A Buck Regulator
(11a)
(11c)
(11d)
(11b)
Two-Phase Buck Load Step
Transient Response
Efficiency vs Load Current
Efficiency vs Input Voltage
0.1µF
L3
4.7µH
4m
10µF
0.1µF
L1
1µH
2m
100µF
x2
COUT1
220µF
COUT3
47µF
0.1µF
2m
68.1k
357k
7817 TA03
4.7µF
D2
D1
100pF
4.7nF
3.65k
47pF
1nF
2k
1nF
1nF
1nF
0.1µF
0.22µF
CIN
100µF
10pF
523k
27.4k
10pF
L2
1µH
D3
LTC7817
VBIAS
SW3
BG3
TG3
BOOST3
SENSE3+
VFB3
ITH1
SENSE3–
SW1
BG1
TG1
BOOST1
SENSE1+
SENSE1–
VIN
12V NOMINAL
4.5V-38V
VOUT1
5V/30A
SW2
BG2
TG2
BOOST2
SENSE2+
VFB1
SENSE2–
EXTVCC
INTVCC
FREQ
PLLIN/MODE
VPRG3
VIN
SGND
INTVCC
INTVCC
RUN1 RUN2 RUN3
TRACK/SS1
TRACK/SS2
SS3
ITH2
ITH3
INTVCC
x4
10µF
x2
PGOOD1
VFB2
VOUT3
24V/2A
MTOP1
MBOT1
MTOP2
MBOT2
MTOP3
MBOT3
MTOP1,2: INFINEON BSC059N04LS6
MBOT1,2: INFINEON BSC022N04LS6
MTOP3: INFINEON BSC059N04LS6
MBOT3: INFINEON BSC059N04LS6
L1,2: COILCRAFT XAL1580-102ME
L3: COILCRAFT XAL1010-472ME
D1,2,3: CENTRAL SEMI CMDSH-4E
CIN: SUNCON 63HVPF100M
COUT1: PANASONIC 6TPF220M5L
COUT3: SUNCON 63CE47LX
fSW=380kHz
VOUT1 FOLLOWS VIN WHEN VIN < 5V
VOUT3 FOLLOWS VIN WHEN VIN > 24V
INTVCC
PGND
Load Step Transient Response
Two–Phase Buck
VIN = 15V
10A TO 30A LOAD STEP
20µs/DIV
VOUT1
500mV/DIV
L1 INDUCTOR
CURRENT
10A/DIV
L2 INDUCTOR
CURRENT
10A/DIV
7817 F11b
Buck
Boost
VIN=10V
VIN=20V
VIN=10V
VIN=20V
LOAD CURRENT (A)
0.001
0.01
0.1
1
10 30
70
75
80
85
90
95
100
Efficiency vs Load Current
7817 F11c
Buck, ILOAD=5A
Buck, ILOAD=20A
Boost, ILOAD=2A
VIN INPUT VOLTAGE (V)
5
10
15
20
25
30
35
40
88
90
92
94
96
98
100
Efficiency vs Input Voltage
7817 F11d



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