参数资料
型号: LTC3786EMSE#PBF
厂商: Linear Technology
文件页数: 1/34页
文件大小: 0K
描述: IC REG CTRLR BST PWM CM 16-MSOP
标准包装: 37
PWM 型: 电流模式
输出数: 1
频率 - 最大: 850kHz
占空比: 100%
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: 16-TFSOP(0.118",3.00mm 宽)裸露焊盘
包装: 管件

LTC3786
Low I Q Synchronous
Boost Controller
Synchronous Operation For Highest Efficiency and
Wide V IN Range: 4.5V to 38V (40V Abs Max) and
Output Voltages Up to 60V
±1% 1.2V Reference Voltage
R SENSE or Inductor DCR Current Sensing
100% Duty Cycle Capability for Synchronous MOSFET
Low Quiescent Current: 55μA
Phase-Lockable Frequency (75kHz to 850kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Adjustable Output Voltage Soft-Start
Power Good Output Voltage Monitor
Low Shutdown Current I Q : <8μA
Internal 5.4V LDO for Gate Drive Supply
Thermally Enhanced 16-Pin 3mm × 3mm QFN and
Industrial and Automotive Power Supplies
Automotive Start-Stop Systems
Medical Devices
High Voltage Battery-Powered Systems
FEATURES
n
Reduced Heat Dissipation
n
Operates Down to 2.5V After Start-Up
n
n
n
n
n
n
n
n
n
n
n
n
MSOP Packages
APPLICATIONS
n
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n
n
TYPICAL APPLICATION
12V to 24V/5A Synchronous Boost Converter
V IN 4.5V TO 24V
DESCRIPTION
The LTC ? 3786 is a high performance synchronous boost
converter controller that drives all N-channel power
MOSFETs. Synchronous rectification increases efficiency,
reduces power losses and eases thermal requirements,
allowing the LTC3786 to be used in high power boost
applications.
A 4.5V to 38V input supply range encompasses a wide
range of system architectures and battery chemistries.
When biased from the output of the boost converter or
another auxiliary supply, the LTC3786 can operate from
an input supply as low as 2.5V after start-up. The 55μA
no-load quiescent current extends operating run time in
battery-powered systems.
The operating frequency can be set for a 50kHz to 900kHz
range or synchronized to an external clock using the
internal PLL. The LTC3786 also features a precision 1.2V
reference and a power good output indicator. The SS pin
ramps the output voltage during start-up. The PLLIN/MODE
pin selects among Burst Mode ? operation, pulse-skipping
mode or continuous inductor current mode at light loads.
L , LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are
registered trademarks and 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
5408150, 5481178, 5705919, 5929620, 6177787, 6498466, 6580258, 6611131.
Efficiency and Power Loss
vs Load Current
VBIAS
SENSE +
LTC3786
PGOOD SENSE –
PLLIN/MODE
RUN
4m
3.3μH
220μF
100
90
80
70
60
BURST
EFFICIENCY
BURST
LOSS
10000
1000
100
15nF
8.66k
12.1k
0.1μF
220pF
232k
FREQ
SS
ITH
VFB
TG
SW
BOOST
BG
INTV CC
GND
0.1μF
4.7μF
220μF
V OUT
24V
5A
50
40
30
0
20 V IN = 12V
V OUT = 24V
10 Burst Mode OPERATION
FIGURE 8 CIRCUIT
0.00001 0.0001 0.001 0.01 0.1 1 10
OUTPUT CURRENT (A)
10
1
0.1
3786 TA01a
3786 TA01b
3786fa
1
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LTC3786EUD#TRPBF 功能描述:IC REG CTRLR BST PWM CM 16-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)
LTC3786IMSE#PBF 功能描述:IC REG CTRLR BST PWM CM 16-MSOP 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)
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