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参数资料
| 型号： | LTC3770EUH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 32-QFN |
| 标准包装： | 73 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 最高 1MHz |
| 占空比： | 90% |
| 电源电压： | 4 V ~ 32 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： | 管件 |
LTC3770
Fast No R SENSE TM Step-Down
Synchronous Controller with
Margining, Tracking and PLL
FEATURES
DESCRIPTION
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Wide V IN Range: 4V to 32V
± 0.67% 0.6V Reference Voltage
Output Voltage Tracking Capability
Programmable Margining
Sense Resistor Optional
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t ON(MIN) ≤ 100ns
Phase-Locked Loop Frequency Synchronization
Powerful Dual N-Channel MOSFET Driver
Adjustable Cycle-by-Cycle Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Current Foldback Protection (Disabled at Start-Up)
Output Overvoltage Protection
Micropower Shutdown: I Q < 30μA
Power Good Output Voltage Monitor
Tracks the Reference Input Pin
Available in (5mm × 5mm) QFN and 28-Lead
The LTC ? 3770 is a synchronous step-down switching
regulator controller with output voltage up/down tracking
capability and voltage margining. Its advanced functions
and high accuracy reference are ideal for powering
high performance server, ASIC and computer memory
systems.
The LTC3770 uses a constant on-time, valley current
mode control architecture to deliver very low duty factors
without requiring a sense resistor. The operating frequency
is selected by an external resistor and is compensated for
variations in input supply voltage. An internal phase-locked
loop allows the IC to be synchronized to an external
clock.
Fault protection is provided by an overvoltage comparator
and input undervoltage lockout. The regulator current
limit is user programmable. A wide supply range allows
voltages as high as 32V to be stepped down to as low as
a 0.6V output. Power supply sequencing is accomplished
SSOP Packages
APPLICATIONS
using an external soft-start timing capacitor.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
R SENSE is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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Distributed Power Systems
Server Power Supply
Protected by U.S. Patents including 5481178, 5487554, 6580258, 6304066, 6476589,
6774611.
TYPICAL APPLICATION
High Ef?ciency Step-Down Converter
Ef?ciency and Power Loss vs Load Current
0.01μF
10k
0.1μF
PGOOD
MARGIN
PLLFLTR
PLLIN
TRACK/SS
I ON
V IN
TG
SW
68k
0.22μF
Si4884
1.8μH
V IN
10μF 5V TO 28V
35V
x3
V OUT
2.5V
100
V IN = 5V
95 V OUT = 2.5V
90
85
80
EFFICIENCY
10
1
I
1000pF
10k
BOOST
TH
LTC3770
SGND INTV CC
RUN DRV CC
CMDSH-3
+
180μF
4V
x2
10A
75
70
65
POWER LOSS
0.1
V OUT
V ON
BG
Si4874
B340A
60
SENSE
10k
V RNG
V REFOUT
SENSE +
–
4.7μF
95.3k
55
50
0.01
0.1
1
0.01
10
V REFIN
PGND
30.1k
LOAD CURRENT (A)
82k
MPGM
V FB
3770 TA01
3770 TA01b
3770fc
1
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| LTC3772BEDDB#TRMPBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-DFN 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) |
| LTC3772BEDDB#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-DFN 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) |
| LTC3772BETS8#TRMPBF | 功能描述:IC REG CTRLR BUCK PWM TSOT23-8 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) |
| LTC3772BETS8#TRPBF | 功能描述:IC REG CTRLR BUCK PWM TSOT23-8 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) |
| LTC3772EDDB#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.75V to 9.8V Input 8-Pin DFN EP |
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