参数资料
型号: LTC3833IUDC#PBF
厂商: Linear Technology
文件页数: 1/36页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 20-QFN
标准包装: 91
PWM 型: 电流模式
输出数: 1
频率 - 最大: 2.2MHz
电源电压: 4.5 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 ~ 125°C
封装/外壳: 20-WFQFN 裸露焊盘
包装: 管件
LTC3833
Wide V IN Range: 4.5V to 38V
V OUT Range: 0.6V to 5.5V
Output Accuracy: ±0.25% at 25°C and ±0.67%
Differential Output Sensing Allowing Up to 500mV
Fast Load Transient Response
t ON(MIN) = 20ns, t OFF(MIN) = 90ns
Controlled On-Time Valley Current Mode
Frequency Programmable from 200kHz to 2MHz
R SENSE or Inductor DCR Current Sensing
Overvoltage Protection and Current Limit Foldback
Power Good Output Voltage Monitor
Output Tracking or Adjustable Soft-Start
External V CC Input for Bypassing Internal LDO
20-Pin QFN (3mm × 4mm) and TSSOP Packages
FEATURES
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over Temperature
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Line Loss
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Architecture
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and Synchronizable to External Clock
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APPLICATIONS
Fast Accurate Step-Down
DC/DC Controller with
Differential Output Sensing
DESCRIPTION
The LTC ? 3833 is a synchronous step-down DC/DC
switching regulator controller targeted for high power
applications. It drives all N-channel power MOSFETs. The
controlled on-time valley current mode architecture allows
for both fast transient response and constant frequency
switching in steady-state operation, independent of V IN ,
V OUT and load current.
Differential output voltage sensing along with a precision
internal reference combine to offer ±0.67% output regula-
tion and the ability to correct for up to ±500mV variations
in the output terminals due to line losses. The operating
frequency can be programmed from 200kHz to 2MHz with
an external resistor and can be synchronized to an external
clock for noise and EMI sensitive applications.
Very low t ON and t OFF times allow for near 0% and near
100% duty cycles, respectively. Programmable soft-start or
output voltage tracking is available. Safety features include
output overvoltage protection, programmable current limit
with foldback, and a power good output signal.
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Distributed Power Systems
Point-of-Load Converters
Computing Systems
Datacomm Systems
L , LT, LTC, LTM, OPTI-LOOP, PolyPhase, μModule, Linear Technology and the Linear logo
are registered trademarks and Hot Swap, No R SENSE and UltraFast are trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 5487554, 6580258, 6304066, 6476589,
6774611.
TYPICAL APPLICATION
1.5V, 20A, 300kHz High Current Step-Down Converter
INTV CC
100k
0.1μF
470pF
10k
137k
300kHz
V RNG V IN
V OUT
SENSE –
PGOOD SENSE +
RUN TG
LTC3833
SW
TRACK/SS BOOST
I TH INTV CC
RT
EXTV CC BG
SGND PGND
MODE/PLLIN
V OSNS+
V OSNS–
0.1μF
INTV CC
4.7μF
0.1μF
3.24k
0.47μH
15k
10k
180μF
V OUT
1.5V
20A
330μF
× 2
3833 TA01a
V IN
4.5V TO 14V
100
90
80
70
60
50
40
0.1
Efficiency
PULSE-SKIPPING
MODE
FORCED
CONTINUOUS
MODE
1 10
LOAD CURRENT (A)
V IN = 12V
V OUT = 1.5V
100
3833 TA01b
3833f
1
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