參數(shù)資料
型號： LTC3770
廠商： Linear Technology Corporation
英文描述： Synchronous Controller with Margining, Tracking and PLL
中文描述： 同步控制器裕，跟蹤和PLL
文件頁數(shù)： 1/24頁
文件大?。?/td> 302K
代理商： LTC3770
1
LTC3770
3770f
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. No R
is a trademark of Linear
Technology Corporation. Protected by U.S. Patents including 5481178, 5487554, 6580258,
6304066, 6476589, 6774611.
Fast No R
SENSE
Synchronous Controller with
Margining, Tracking and PLL
DESCRIPTIOU
TM
Step-Down
■
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 Lock 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
< 30
μ
A
■
Power Good Output Voltage Monitor
Tracks the Reference Input Pin
■
Available in (5mm
×
5mm) QFN and 28-Lead
SSOP Packages
APPLICATIU
■
Distributed Power Systems
■
Server Power Supply
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 fre-
quency is selected by an external resistor and is compen-
sated for variations in input supply voltage. An internal
phase-lock 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 volt-
ages as high as 32V to be stepped down to as low as a 0.6V
output. Power supply sequencing is accomplished using
an external soft-start timing capacitor.
High Efficiency Step-Down Converter
FEATURES
TYPICAL APPLICATIO
U
CMDSH-3
B340A
95.3k
30.1k
10k
82k
1.8
μ
H
10
μ
F
10
μ
F
35V
x3
V
5V TO 28V
V
2.5V
10A
180
μ
F
4V
x2
Si4874
Si4884
68k
0.1
μ
F
0.22
μ
F
10k
1000pF
V
OUT
10k
0.01
μ
F
+
I
ON
V
IN
TG
SW
BOOST
PLLIN
RUN
V
ON
V
RNG
I
TH
SGND
INTV
CC
DRV
CC
BG
PGND
SENSE
–
SENSE
+
V
FB
V
REFIN
MPGM
LTC3770
PGOOD
MARGIN
V
REFOUT
TRACK/SS
PLLFLTR
3770 TA01
LOAD CURRENT (A)
E
100
90
80
70
60
50
95
85
75
65
55
P
10
0.1
1
0.01
0.01
1
10
3770 TA01b
0.1
V
IN
= 5V
V
OUT
= 2.5V
EFFICIENCY
POWER LOSS
Efficiency and Power Loss vs Load Current
相關(guān)PDF資料
PDF描述
LTC3770EG Synchronous Controller with Margining, Tracking and PLL
LTC3770EUH Synchronous Controller with Margining, Tracking and PLL
LTC3776 16-Bit Buffer/Driver With 3-State Outputs 48-TVSOP -40 to 85
LTC3776EUF Dual 2-Phase, No RSENSE Synchronous Controller for DDR/QDR Memory Termination
LTC3776EGN Dual 2-Phase, No RSENSE Synchronous Controller for DDR/QDR Memory Termination
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3770EG 制造商:Linear Technology 功能描述:LDO Cntrlr SYNC BUCK REG 0.6V to 32V 28-Pin SSOP
LTC3770EG#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3770EG#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3770EUH#PBF 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3770EUH#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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