参数资料
型号: LTC3867EUF#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 24-QFN
产品培训模块: LTC3867 Synchronous Step-Down DC/DC Controller
标准包装: 91
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1.2MHz
占空比: 98%
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 ~ 125°C
封装/外壳: 24-WFQFN 裸露焊盘
包装: 管件
LTC3867
Synchronous Step-Down
DC/DC Controller with
Differential Remote Sense
and Nonlinear Control
V IN Range: 4V to 38V
V OUT Range: 0.6V to 14V
Nonlinear Control Architecture Minimizes Output
Programmable DCR Temperature Compensation
±0.75% 0.6V Voltage Reference
Fixed Frequency Range of 200kHz to 1.2MHz
PLL Frequency Synchronization
R SENSE or DCR Current Sensing
Differential Remote Output Voltage Sense
Supports Smooth Start-Up into Pre-Biased Outputs
Programmable Soft-Start or V OUT Tracking
Hiccup Mode/Soft Recovery from Output Overcurrent
24-Lead (4mm × 4mm) QFN Package
Automotive Systems
Telecom Systems
Industrial Equipment
Distributed DC Power Systems
FEATURES
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n
n
Transient Excursions (Optional)
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n
n
n
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n
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APPLICATIONS
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L , LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6177787,
6580258, 6498466, 6611131.
TYPICAL APPLICATION
High Efficiency Synchronous Step-Down Controller
DESCRIPTION
The LTC ? 3867 is a current mode synchronous step-down
switching regulator controller that drives all N-channel
power MOSFET stages. Output voltage transient excursions
are minimized by use of a nonlinear control architecture
to eliminate clock latency issues.
The maximum current sense voltage is programmable
from 30mV to 75mV, allowing the use of either a discrete
sense resistor or the inductor DCR as the sensing element.
Programmable DCR temperature compensation allows
constant current limit regardless of inductor tempera-
ture. Programmable inductor temperature-based thermal
shutdown protects the power components from thermal
stress. Soft recovery from output shorts or overcurrent
minimizes output overshoot.
The LTC3867 features a precision 0.6V reference and
can regulate output voltages up to 14V from a wide
4V to 38V input supply range. The LTC3867 includes
a high speed differential remote sense amplifier. Burst
Mode ? operation, continuous and pulse-skipping modes
are supported. The LTC3867 is available in a 24-lead
(4mm × 4mm) QFN package.
DIFF +
DIFF –
ITEMP
ITSD
SGND
Efficiency and Power Loss
EXTV CC
0.22μF
0.1μF
37.4k
INTV CC
330pF
100pF
49.9k
49.9k
75k
DIFFOUT PGOOD
I LIM RUN
TK/SS
FREQ V IN
MODE/PLLIN TG
IFAST
LTC3867
I TH BOOST
SW
SGND INTV CC
V FB
SENSE – BG
+
INTV CC
0.1μF
D B
4.7μF
22μF
50V
0.4μH
3.3k
V IN
5V TO 18V
V OUT
1.5V
10A
330μF × 2
+100μF
100
90
80
70
60
50
40
30
20
10
0
0.01
0.1
1 10
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100
SENSE +
PGND
3867 TA01a
LOAD CURRENT (A)
3867 TA01b
3867f
1
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LTC3867IUF#PBF 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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 ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3867IUF#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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 ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3868EGN-1#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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 ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3868EGN-1#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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 ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
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