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| 型号： | LTC1909-8EG |
| 厂商： | Linear Technology |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 47 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 200kHz |
| 占空比： | 90% |
| 电源电压： | 4 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： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
| 其它名称： | LTC19098EG |
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LTC1909-8
Wide Operating Range,
No R SENSE TM Step-Down DC/DC
Controller with SMBus Programming
FEATURES
DESCRIPTIO
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SMBus/I 2 C TM Programmable Output Voltage:
1.3V to 3.5V
No Sense Resistor Required
2% to 90% Duty Cycle at 200kHz
t ON(MIN) ≤ 100ns
True Current Mode Control
Stable with Ceramic C OUT
Power Good Output Voltage Monitor and 50 μ s Timer
Wide V IN Range: 4V to 36V (Abs Max)
Precision Resistor Divider and Reference Provide
± 1.35% Output Voltage Accuracy Over Temperature
Adjustable Switching Frequency and Current Limit
Forced Continuous Control Pin
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Available in a 28-Lead SSOP Package
The LTC ? 1909-8 is a synchronous step-down switching
regulator controller with a digitally programmable output
voltage. The output voltage is selected from one of two
5-bit settings programmed into internal registers via a
2-wire SMBus/I 2 C interface. The interface features safe-
guards against invalid output voltages and allows the mi-
croprocessor to turn the regulator on and off. Valley cur-
rent control delivers very low duty cycles without requiring
a sense resistor. Operating frequency is selected by an
external resistor and is compensated for variations in V IN
and V OUT .
Discontinuous mode operation provides high efficiency
operation at light loads. A forced continuous control pin
reduces noise and RF interference and can assist second-
ary winding regulation by disabling discontinuous mode
operation when the main output is lightly loaded.
Fault protection is provided by internal foldback current
APPLICATIO S
limiting, an output overvoltage comparator and optional
short-circuit shutdown timer.
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Power Supplies for DSPs, ASICs, FPGAs and CPUs
Voltage Margining
The LTC1909-8 is available in the 28-lead SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R SENSE is a trademark of Linear Technology Corporation.
I 2 C is a trademark of Philips Electronics N.V.
TYPICAL APPLICATIO
100k
100k
100k
0.1 μ F
11k
100pF
39k
1
2
3
4
5
FCB PGND
LTC1909-8
RUN/SS BOOST
V ON TG
PGOOD SW
V RNG SENSE +
28
27
26
25
24
CMDSH-3
0.22 μ F
M1
L1
1.8 μ H
C IN
10 μ F
50V
× 4
V IN
5V TO 24V
GND
V OUT
2.5V OR 2.6V
10A
(V OUT SET BY SEL)
SEL
470pF
20k
6
7
8
9
10
I TH
SGND
I ON
V FB
SEL
BG
INTV CC
V IN
EXTV CC
V CC
23
22
21
20 5V
EXT
19
1 ?
0.1 μ F
+
4.7 μ F
6.3V
M2
D1
+
C OUT1, 2
180 μ F
4V
× 2
C OUT3
22 μ F
6.3V
X7R
GND
SDA
SCL
VRON
11
12
13
14
SDA
SCL
VRON
PGTMR
GND
FB
V OSENSE
CPUON
18
17
16
15
R ON
1.4M 1%
19098 F01
C IN : UNITED CHEMICON THCR60E1H106TZ
C OUT1, 2 : CORNELL DUBILIER ESRE181ME04B/
PANASONIC EEFVEOG181R
D1: DIODES INC. B340A
L1: SUMIDA CEP125-1R8MC-H
M1: Si4884
M2: Si4874
Figure 1. High Efficiency Step-Down Converter
19098f
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 74HC273DB | 功能描述:触发器 OCTAL D-TYPE RoHS:否 制造商:Texas Instruments 电路数量:2 逻辑系列:SN74 逻辑类型:D-Type Flip-Flop 极性:Inverting, Non-Inverting 输入类型:CMOS 输出类型: 传播延迟时间:4.4 ns 高电平输出电流:- 16 mA 低电平输出电流:16 mA 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:X2SON-8 封装:Reel |
| 74HC273DB,112 | 功能描述:触发器 OCTAL D-TYPE RoHS:否 制造商:Texas Instruments 电路数量:2 逻辑系列:SN74 逻辑类型:D-Type Flip-Flop 极性:Inverting, Non-Inverting 输入类型:CMOS 输出类型: 传播延迟时间:4.4 ns 高电平输出电流:- 16 mA 低电平输出电流:16 mA 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:X2SON-8 封装:Reel |
| 74HC273DB,118 | 功能描述:触发器 OCTAL D-TYPE RoHS:否 制造商:Texas Instruments 电路数量:2 逻辑系列:SN74 逻辑类型:D-Type Flip-Flop 极性:Inverting, Non-Inverting 输入类型:CMOS 输出类型: 传播延迟时间:4.4 ns 高电平输出电流:- 16 mA 低电平输出电流:16 mA 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:X2SON-8 封装:Reel |
| 74HC273DBT | 制造商:NXP Semiconductors 功能描述:HC/UH SERIES, POSITIVE EDGE TRIGGERED D FLIP-FLOP, TRUE OUTPUT, 20 Pin Plastic SMT |
| 74HC273DB-T | 功能描述:触发器 OCTAL D-TYPE RoHS:否 制造商:Texas Instruments 电路数量:2 逻辑系列:SN74 逻辑类型:D-Type Flip-Flop 极性:Inverting, Non-Inverting 输入类型:CMOS 输出类型: 传播延迟时间:4.4 ns 高电平输出电流:- 16 mA 低电平输出电流:16 mA 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:X2SON-8 封装:Reel |
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