参数资料
型号: LTC3879IUD#TRPBF
厂商: Linear Technology
文件页数: 1/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 16-QFN
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 2MHz
占空比: 90%
电源电压: 4 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 16-WFQFN 裸露焊盘
包装: 带卷 (TR)
LTC3879
Fast, Wide Operating
Range No R SENSE
Step-Down Controller
FEATURES
DESCRIPTION
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Wide V IN Range: 4V to 38V
±1% 0.6V Voltage Reference
Extremely Fast Transient Response
t ON(MIN) : 43ns
No R SENSE ? Valley Current Mode Control
Stable with Low ESR Ceramic C OUT
Supports Smooth Start-Up in Pre-Biased Output
Optimized for High Step-Down Ratios
Adjustable Output Voltage Soft-Start or Tracking
Power Good Output Voltage Monitor
Dual N-Channel MOSFET Synchronous Drive
Adjustable Switching Frequency
Programmable Current Limit with Foldback
Output Overvoltage Protection
16-Pin MSOP and 3mm × 3mm QFN Packages
The LTC ? 3879 is a synchronous step-down switching
regulator controller optimized for high switching frequency
and fast transient response. The constant on-time valley
current mode architecture allows for a wide input range,
including very low duty factor operation. No external sense
resistor or slope compensation is required. System ?ex-
ibility is offered through a user-programmable soft-start pin
and independent RUN pin. The voltage ramping soft-start
function can be programmed with a capacitor or made to
track an external reference source.
Operating frequency is set by an external resistor and
compensated for variations in V IN to offer excellent line
stability. Discontinuous mode operation provides high
ef?ciency during light load conditions. A forced continu-
ous control pin allows the user to reduce noise and RF
APPLICATIONS
interference. Safety features include output overvoltage
protection and programmable current limit with foldback.
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Distributed Power Systems
The current limit is user programmable.
Embedded Computing
Communications Infrastructure
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L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No R SENSE is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6100678, 6580258, 5847554, 6304066.
TYPICAL APPLICATION
High Ef?ciency Step-Down Converter
The LTC3879 allows operation from 4V to 38V at the input
and from 0.6V to 90% V IN at the output. The LTC3879 is
available in a small 16-pin thermally enhanced MSOP or
3mm × 3mm QFN packages.
Ef?ciency vs Load Current
0.1μF
27k
220pF
RUN I ON
TRACK/SS V IN
TG
LTC3879
I TH SW
SGND BOOST
MODE
432k
0.22μF
RJK0305
0.56μH
10μF
V IN
4.5V TO 28V
V OUT
1.2V
15A
100
90
80
70
60
50
DISCONTINUOUS
MODE
CONTINUOUS
MODE
INTV CC
BG
4.7μF
RJK0330
330μF
2
40
30
PGOOD PGND
V RNG V FB
10k
10k
20
10
0
0.01
0.1
V IN = 12V
V OUT = 1.2V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
1 10 100
3879 TA01a
LOAD CURRENT (A)
3879 TA01b
3879f
1
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