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PDF LTC3802 Data sheet ( Hoja de datos )
| Número de pieza | LTC3802 | |
| Descripción | Dual 550kHz Synchronous 2-Phase DC/DC Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC3802 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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LTC3802
Dual 550kHz Synchronous
2-Phase DC/DC Controller with
Programmable Up/Down Tracking
www.datasheet4u.com
FEATURES
DESCRIPTIO
s Wide VIN Range: 3V to 30V Operation with Line
Feedforward Compensation
s Leading Edge Modulation Architecture for
Extremely Low Duty Cycle Operation
s Phase-Lockable Fixed Frequency: 330kHz to 750kHz
s Two 180° Out-of-Phase Controllers
s Fast Programmable Power-Up/-Down Tracking
s Programmable Current Limit Without External
Current Sense Resistor
s Optional Burst Mode® Operation at Light Load
s ±1% 0.6V Voltage Reference
s External N-Channel MOSFET Architecture
s Low Shutdown Current: <100µA
s Overvoltage Protection and PGOOD Flag
s Small 28-Lead SSOP and 32-Lead QFN Packages
U
APPLICATIO S
s Notebook and Palmtop Computers
s Portable Instruments
s Battery-Operated Digital Devices
s DC Power Distribution Systems
The LTC®3802 is a dual switching regulator controller
optimized for high efficiency step-down conversion from
input voltages between 3V to 30V. The controller uses a
leading edge modulation scheme to allow extremely low
duty cycle operation. The constant frequency voltage mode
controller allows a phase-lockable frequency between
330kHz and 750kHz. Power loss and noise due to the ESR
of the input capacitors are minimized by operating the two
controller output stages 180° out of phase. The synchro-
nous buck architecture automatically shifts to Burst Mode
operation as the output load decreases, ensuring maxi-
mum efficiency over a wide range of load currents.
The LTC3802 features an onboard, trimmed 0.6V refer-
ence and provides better than 1% regulation at the con-
verter outputs. A separate output sense provides real time
overvoltage protection and PGOOD sensing. An FBT pin
programs the power-up/-down tracking between the two
channels to meet various sequencing requirements. A
RUN/SS pin provides soft-start and externally program-
mable current limit protection functions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
U.S. Patent Nos 5481178, 5846544, 6304066, 6580258, 5055767, 6307356
TYPICAL APPLICATIO
VIN
5V TO 22V + 56µF
25V
×2
VOUT1
3.3V
15A
10k 10k
2.21k 2.21k
4.7µF
25V
×8
1µH
B340B
+ 330µF
4V
×3
560pF
1500pF
390Ω
5V
CMDSH-3
Si7860DP
×2
0.1µF
Si7440DP
×2 47k
2200pF
15k
330pF
CMDSH-3
TG1 PVCC TG2
BOOST2
BOOST1
SW2
SW1 BG2
BG1 PLLIN
PGND
PLLLPF
LTC3802
IMAX1
IMAX2
FBT CMPIN2
CMPIN1
VCC
COMP1
COMP2
FB1
SGND
FB2
PHASEMD
FCB
RUN/SS
VINFF
PGOOD
0.1µF
10k
5V
+
10µF
0.1µF
47k
Si7860DP
×2
Si7440DP
×2
1µH
B340B
330µF +
4V
×3
0.1µF
5V
+ 10Ω
10µF
2200pF
15k
330pF
560pF
1500pF
390Ω
VIN
0.47µF
VOUT2
2.5V
15A
10k 10k
3.16k 3.16k
3802 TA01
3802f
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC3802
Efficiency vs IOUT
100
www.data95sheet4OBuPu.ErcsRotAMmToIOdNe
90
85
80
75
CONTINUOUS
MODE
70
65
60
55
50
45
40
0.1
VIN = 12V
VOUT = 3.3V
TA = 25°C
CIRCUIT ON THE FIRST PAGE
OF THIS DATA SHEET
1 10 100
IOUT (A)
3802 G01
Efficiency vs VIN
100
TA = 25°C
98 CIRCUIT ON THE FIRST PAGE
OF THIS DATA SHEET
96
94 VOUT = 2.5V
92 IOUT = 5A
90
VOUT = 2.5V
IOUT = 10A
88
86
84
82
80
0 5 10 15 20
VIN (V)
25 30
3802 G02
Load Regulation
2.5125
2.5075
VIN = 12V
TA = 25°C
CIRCUIT ON THE FIRST PAGE
OF THIS DATA SHEET
0.5
0.4
0.3
0.2
2.5025
0.1
0
2.4975
–0.1
–0.2
2.4925
–0.3
–0.4
2.4875
0
–0.5
5 10 15 20
IOUT (A)
3802 G03
Line Regulation
2.5125
2.5075
VCC = 5V
IOUT = 5A
TA = 25°C
2.5025
2.4975
2.4925
2.4875
0
5 10 15 20
VIN (V)
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
25 30
3802 G04
VFB vs Temperature
606.0
VCC = 5V
604.8
1.0
0.8
603.6
0.6
602.4
0.4
601.2
0.2
600.0
0
598.8
–0.2
597.6
–0.4
596.4
–0.6
595.2
–0.8
594.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
–1.0
100 125
LTC1323 • TPC05
VFB vs VCC Supply Voltage
603.0
TA = 25°C
602.4
0.5
0.4
601.8
0.3
601.2
0.2
600.6
0.1
600.0
0
599.4
–0.1
598.8
–0.2
598.2
–0.3
597.6
–0.4
597.0
3
3.5 4 4.5 5 5.5
VCC SUPPLY VOLTAGE (V)
–0.5
6
3802 G06
Line Feedforward Transient
VOUT
2.5V
(NO LOAD)
AC 50mV/DIV
VCOMP
AC 50mV/DIV
VIN
5V TO 15V
STEP
5V/DIV
CIN: 1µF/50V ×6 10µs/DIV
SANYO 35CV220AX
3802 G07
3802f
5
5 Page 
BLOCK DIAGRA
www.datasheet4u.com
PLLIN
PLLLPF
PHASEMD
TO CH2
PLL AND OSC
–
PWM
+
VINFF
COMP1, 2
LINE
FEEDFORWARD
COMPENSATION
LTC3802
CHANNEL 1
SUBCIRCUIT
VCC FCB DUPLICATE FOR
SECOND CONTROLLER
CHANNEL
DISABLE Burst Mode
OPERATION
STOP TOP GATE
LOGIC
BURST
÷ 100
– ILIM +
÷5
–1
10µA
BOOST1, 2
TG1, 2
SW1, 2
PVCC
BG1, 2
PGND
SGND
IMAX1,2
EXTREF
(QFN PACKAGE
ONLY)
VREF
0.6V
FB1, 2
7µA
POWER DOWN
SOFT-
START
RUN/SS
ERR
FBT
TRACK
CMPIN2
POS
RESET
VREF + 15mV
NEG
RESET
VREF – 12mV
MAX
VREF + 5%
CMPIN1, 2
PGOOD
MPG
100µs
DELAY
FROM CH2 PGOOD
COMPARATORS
NPG
VREF – 10%
VREF + 10%
PPG
PGOOD COMPARATORS
3802 BD
3802f
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC3802.PDF ] | |
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