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LTC7803 Datasheet(PDF) 42 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) 42 Page - Analog Devices

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LTC7817
42
Rev 0
For more information www.analog.com
TYPICAL APPLICATIONS
Figure 14. High Efficiency Wide Input Range 2.25MHz Dual 5V/3.3V Regulator
(14a)
(14c)
(14d)
(14b)
0.1µF
L3
0.16µH
2m
10µF
0.1µF
3m
100
4.7µF
x4
150µF
10µF
68µF
0.1µF
5m
357k
68.1k
10µF
100µF
68.1k
4.7µF
D2
D1
220pF
6.8nF
7.68k
47pF
2.2nF
12.4k
47pF
680pF
9.3k
1nF
1nF
1nF
0.1µF
0.1µF
0.1µF
220µF
63V
210k
47pF
L1
0.16µH
L2
0.33µH
D3
1V TO 38V*
(>5V START-UP)
LTC7817
VBIAS
SW3
BG3
TG3
BOOST3
SENSE3+
VFB3
ITH1
SENSE3–
SW1
BG1
TG1
BOOST1
SENSE1+
VFB1
SENSE1–
VIN
VOUT1
3.3V/10A
VOUT3
8V WHEN VIN<8V
FOLLOWS VIN WHEN VIN>8V
SW2
BG2
TG2
BOOST2
SENSE2+
VFB2
SENSE2–
EXTVCC
VOUT2
5V/7A
INTVCC
FREQ
VPRG3
VOUT3
PLLIN/MODE
INTVCC
INTVCC
RUN1 RUN2 RUN3
TRACK/SS1
TRACK/SS2
SS3
ITH2
ITH3
INTVCC
x2
4V
6.3V
x3
PGOOD1
MTOP1,2: INFINEON BSC093N04LS
MBOT1,2: INFINEON BSC093N04LS
MTOP3 (x2): INFINEON BSC027N04LS
MBOT3: INFINEON BSC059N04LS
L1,3: COILCRAFT XAL5030-161ME
L2: COILCRAFT XAL5030-331ME
MTOP1
MBOT1
MTOP2
MBOT2
MTOP3
×2
MBOT3
D1,2,3: INFINEON BAS140WE6327HTSA1
CIN: SUNCON 63CE220LX
COUT1: KEMET T520B157M004ATE015
COUT2: KEMET T520B107M006APE070
COUT3: PANASONIC 50SVPF68M
fSW=2.25MHz
* WHEN VIN < 4V, MAXIMUM COMBINED LOAD CURRENT AVAILABLE IS REDUCED
* OUTPUT CURRENT CAPABILITY AT HIGH INPUT VOLTAGES MAY BE LIMITED BY THE THERMAL
CHARACTERISTICS OF THE OVERALL SYSTEM AND PRINTED CIRCUIT BOARD DESIGN
CIN
COUT3
COUT1
COUT2
50V
INTVCC
7817 TA06
75
SGND
PGND
Efficiency and Power Loss vs
Load Current
VOUT1 Switch Node Waveform
Efficiency vs Input Voltage
VOUT2 = 5V
ALL THREE CHANNELS ON
BURST MODE OPERATION
POWER LOSS
VOUT1 = 3.3V
EFFICIENCY
VIN = 12V
LOAD CURRENT (A)
0.0001
0.001
0.01
0.1
1
10
0
10
20
30
40
50
60
70
80
90
100
0.001
0.01
0.1
1
10
100
vs Load Current
Efficiency and Power Loss
7817 F14b
VIN = 24V
IOUT1 = 4A
100ns/Div
–5
0
5
10
15
20
25
30
35
40
VOUT1 Switch Node Waveform
7817 F14c
VOUT1 = 3.3V
VOUT2 = 5V
ALL THREE CHANNELS ON
BURST MODE OPERATION
IOUT1 = 100mA
IOUT1 = 5A
IOUT2 = 100mA
IOUT2 = 5A
VIN VOLTAGE (V)
0
5
10
15
20
25
30
35
40
0
10
20
30
40
50
60
70
80
90
100
Efficiency vs Input Voltage
7817 F14d



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