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| 型号： | LTC3802EUH#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 850kHz |
| 占空比： | 92% |
| 电源电压： | 3 V ~ 30 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3802
Dual 550kHz Synchronous
2-Phase DC/DC Controller with
Programmable Up/Down Tracking
FEATURES
DESCRIPTIO
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Wide V IN Range: 3V to 30V Operation with Line
Feedforward Compensation
Leading Edge Modulation Architecture for
Extremely Low Duty Cycle Operation
Phase-Lockable Fixed Frequency: 330kHz to 750kHz
Two 180 ° Out-of-Phase Controllers
Fast Programmable Power-Up/-Down Tracking
Programmable Current Limit Without External
Current Sense Resistor
Optional Burst Mode ? Operation at Light Load
± 1% 0.6V Voltage Reference
External N-Channel MOSFET Architecture
Low Shutdown Current: <100 μ A
Overvoltage Protection and PGOOD Flag
Small 28-Lead SSOP and 32-Lead QFN Packages
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
APPLICATIO S
overvoltage protection and PGOOD sensing. An FBT pin
programs the power-up/-down tracking between the two
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Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
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
V IN
V OUT1
3.3V
15A
5V TO 22V
10k
+
56 μ F
25V
× 2
10k
+
4.7 μ F
25V
× 8
1 μ H
B340B
330 μ F
4V
× 3
560pF
5V
CMDSH-3
Si7860DP
× 2
0.1 μ F
Si7440DP
× 2 47k
CMDSH-3
TG1 PV CC TG2
BOOST2
BOOST1 SW2
SW1 BG2
BG1 PLLIN
PGND PLLLPF
LTC3802
I MAX1 I MAX2
+
10 μ F
0.1 μ F
47k
Si7860DP
× 2
Si7440DP
× 2
1 μ H
B340B
330 μ F
4V
× 3
+
10k
3.16k
3.16k
V OUT2
2.5V
15A
10k
2.21k
2.21k
FBT
CMPIN2
1500pF
390 ?
15k
2200pF
CMPIN1
COMP1
FB1
V CC
COMP2
FB2
0.1 μ F
+
10 ?
10 μ F
5V
560pF
390 ?
330pF
SGND
FCB
RUN/SS
PHASEMD
V INFF
PGOOD
330pF
2200pF
15k
1500pF
3802 TA01
0.1 μ F
5V
10k
V IN
0.47 μ F
3802f
1
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