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LTC7802EUFDM Datasheet(PDF) 30 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) 30 Page - Analog Devices

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LTC7802
30
Rev. 0
For more information www.analog.com
TYPICAL APPLICATIONS
Figure 9. High Efficiency Dual 3.3V, 5V Step-Down Regulator with Spread Spectrum
0.1µF
D1
D2
L1
0.9µH
MTOP1
MTOP2
3m
MBOT2
MBOT1
0.1µF
L2
1.8µH
100µF
×2
2m
210k
68.1k
7802 F09a
LTC7802
RUN1
RUN2
SW1
BG1
TG1
BOOST1
SENSE1–
VIN
INTVCC
VIN
4.5V TO 38V
VOUT1
3.3V, 12A
VOUT2
5V*, 10A
SENSE1+
SENSE2–
MODE
TRACK/SS2
ITH2
EXTVCC
VFB2
PLLIN/SPREAD
SENSE2+
SW2
BG2
TG2
BOOST2
VFB1
PGOOD2
PGOOD1
INTVCC
ITH1
TRACK/SS1
FREQ
GND
357k
68.1k
0.1µF
3.3nF
11k
100pF
3.3nF
4.5k
0.1µF
4.7µF
fSW = 350kHz
CIN
100µF
63V
10µF
×3
+
INTVCC
COUT1
330µF
6.3V
+
100pF
100µF
×2
COUT2
330µF
6.3V
+
L1: WURTH 744355090
L2: WURTH 744313180
MTOP1,2: INFINEON BSC059N04LS6
MBOT1,2: INFINEON BSC022N04LS6
D1,2: CENTRAL SEMI CMDSH-4E
CIN: SUNCON 63CE100LX
COUT1,2: KEMET T520V337M006ATE015
*VOUT2 FOLLOWS VIN WHEN VIN < 5V
1nF
1nF
20
VOUT1 = 3.3V
VOUT2 = 5V
BOTH CHANNELS ON
BURST MODE OPERATION
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 12V
VIN = 24V
VIN = 36V
LOAD CURRENT (A)
0
3
6
9
12
70
75
80
85
90
95
100
7802 F09b
ONLY CHANNEL 1 ON
BOTH CHANNELS ON
VIN VOLTAGE (V)
5
10
15
20
25
30
35
40
0
5
10
15
20
25
30
35
40
45
50
7802 F09c
VIN = 12V
FORCED CONTINUOUS MODE
100µs/DIV
7802 F09d
VOUT2
5V/DIV
INDUCTOR
CURRENT
5A/DIV
Efficiency vs Load Current
No-Load Burst Mode Input
Current vs Input Voltage
Short-Circuit Response



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