- 您现在的位置：买卖IC网 > PDF目录15347 > LTC1872ES6#TR (Linear Technology)IC REG CTRLR BST PWM CM SOT23-6 PDF资料下载
参数资料
| 型号： | LTC1872ES6#TR |
| 厂商： | Linear Technology |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM SOT23-6 |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 650kHz |
| 电源电压： | 2.5 V ~ 9.8 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 ~ 85°C |
| 封装/外壳： | SOT-23-6 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1872CS6#TR LTC1872CS6TR LTC1872CS6TR-ND LTC1872ES6TR |
LTC1872
OPERATIO
(Refer to Functional Diagram)
I PK =
Comparator OVP guards against transient overshoots
> 7.5% by turning off the external N-channel power
MOSFET and keeping it off until the fault is removed.
Burst Mode Operation
The LTC1872 enters Burst Mode operation at low load
currents. In this mode, the peak current of the inductor is
set as if V ITH /RUN = 1V (at low duty cycles) even though
the voltage at the I TH /RUN pin is at a lower value. If the
inductor’s average current is greater than the load require-
ment, the voltage at the I TH /RUN pin will drop. When the
I TH /RUN voltage goes below 0.85V, the sleep signal goes
high, turning off the external MOSFET. The sleep signal
goes low when the I TH /RUN voltage goes above 0.925V
and the LTC1872 resumes normal operation. The next
oscillator cycle will turn the external MOSFET on and the
switching cycle repeats.
Undervoltage Lockout
To prevent operation of the N-channel MOSFET below safe
input voltage levels, an undervoltage lockout is incorpo-
rated into the LTC1872. When the input supply voltage
drops below approximately 2.0V, the N-channel MOSFET
and all circuitry is turned off except the undervoltage
block, which draws only several microamperes.
110
100
90
80
70
60
Overvoltage Protection
The overvoltage comparator in the LTC1872 will turn the
external MOSFET off when the feedback voltage has risen
7.5% above the reference voltage of 0.8V. This compara-
tor has a typical hysteresis of 20mV.
Slope Compensation and Inductor’s Peak Current
The inductor’s peak current is determined by:
V ITH ? 0 . 7
10 ( R SENSE )
when the LTC1872 is operating below 40% duty cycle.
However, once the duty cycle exceeds 40%, slope com-
pensation begins and effectively reduces the peak induc-
tor current. The amount of reduction is given by the curves
in Figure 2.
Short-Circuit Protection
Since the power switch in a boost converter is not in series
with the power path from input to load, turning off the
switch provides no protection from a short-circuit at the
output. External means such as a fuse in series with the
boost inductor must be employed to handle this fault
condition.
50
40
30
20
10
0
I RIPPLE = 0.4I PK
AT 5% DUTY CYCLE
I RIPPLE = 0.2I PK
AT 5% DUTY CYCLE
V IN = 4.2V
10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
1872 F02
Figure 2. Maximum Output Current vs Duty Cycle
5
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1872ES6#TRPBF | IC REG CTRLR BST PWM CM SOT23-6 |
| LTC1872ES6#TRM | IC REG CTRLR BST PWM CM SOT23-6 |
| UVY1C332MHD | CAP ALUM 3300UF 16V 20% RADIAL |
| URU0J472MRD | CAP ALUM 4700UF 6.3V 20% RADIAL |
| ISC1210EB390K | INDUCTOR WW 39UH 10% 1210 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1872ES6TRMPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Step-Up 2.5-9.8V TSOT23 |
| LTC1873EG | 功能描述:IC REG CTRLR BUCK PWM VM 28-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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1873EG#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 28-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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1873EG#TR | 功能描述:IC REG CTRLR BUCK PWM VM 28-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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1873EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 28-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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
发布紧急采购，3分钟左右您将得到回复。