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参数资料
| 型号： | LTC1775IS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 165kHz |
| 占空比： | 99% |
| 电源电压： | 4.3 V ~ 36 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC1775
High Power
No R SENSE
TM
Current Mode
Synchronous Step-Down
Switching Regulator
FEATURES
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
Highest Efficiency Current Mode Controller
No Sense Resistor Required
300mV Maximum Current Sense Voltage
Stable High Current Operation
Dual N-Channel MOSFET Synchronous Drive
Wide V IN Range: 4V to 36V
Wide V OUT Range: 1.19V to V IN
± 1% 1.19V Reference
Programmable Fixed Frequency with Injection Lock
Very Low Drop Out Operation: 99% Duty Cycle
Forced Continuous Mode Control Pin
Optional Programmable Soft Start
Pin Selectable Output Voltage
Foldback Current Limit
Output Overvoltage Protection
Logic Controlled Micropower Shutdown: I Q < 30 μ A
Available in 16-Lead Narrow SSOP and SO Packages
The LTC ? 1775 is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using few external components. Current mode
control with MOSFET V DS sensing eliminates the need for
a sense resistor and improves efficiency. Largely similar
to the LTC1625, the LTC1775 has twice the maximum
sense voltage for high current applications. The frequency
of a nominal 150kHz internal oscillator can be synchro-
nized to an external clock over a 1.5:1 frequency range.
Burst Mode TM operation at low load currents reduces
switching losses and low dropout operation extends oper-
ating time in battery-powered systems. A forced continu-
ous mode control pin can assist secondary winding
regulation by disabling Burst Mode operation when the
main output is lightly loaded.
Fault protection is provided by foldback current limiting
and an output overvoltage comparator. An external ca-
APPLICATIO S
pacitor attached to the RUN/SS pin provides soft start
capability for supply sequencing. A wide supply range
s
s
s
s
Notebook Computers
Automotive Electronics
Battery Chargers
Distributed Power Systems
allows operation from 4V (4.3V for LTC1775I) to 36V at the
input and 1.19V to V IN at the output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R SENSE and Burst Mode are trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO N
Efficiency vs Load Current
C C
C SS 0.1 μ F
R C
10k
LTC1775
SYNC V IN
TK
RUN/SS TG
V PROG SW
BOOST
I TH INTV CC
C B 0.33 μ F
D B
CMDSH-3
M1
SUD50N03-10
D1
MBRS340
L1
6 μ H
+
C IN
22 μ F
30V
× 4
+
V IN
5V TO
28V
V OUT
3.3V
C OUT 10A
680 μ F
6.3V
100
95
90
85
80
V IN = 10V
f = 150kHz
FCB = INTV CC
V OUT = 5V
V OUT = 3.3V
2.2nF
SGND BG
V OSENSE PGND
+
C VCC
4.7 μ F
M2
SUD50N03-10
1775 F01
75
70
0.01
0.1 1
10
LOAD CURRENT (A)
Figure 1. High Efficiency Step-Down Converter
1775 F01b
1
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相关代理商/技术参数 |
参数描述 |
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| LTC1778EGN | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 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) |
| LTC1778EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP 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) |
| LTC1778EGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 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) |
| LTC1778EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP 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) |
| LTC1778EGN-1 | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 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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