- 您现在的位置：买卖IC网 > PDF目录15248 > LTC1876EG (Linear Technology)IC REG CTRLR BST PWM CM 36-SSOP PDF资料下载
参数资料
| 型号： | LTC1876EG |
| 厂商： | Linear Technology |
| 文件页数： | 20/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 36-SSOP |
| 标准包装： | 37 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 3 |
| 频率 - 最大： | 360kHz |
| 占空比： | 99.4% |
| 电源电压： | 3.5 V ~ 36 V |
| 降压： | 是 |
| 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： | 36-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
LTC1876
APPLICATIO S I FOR ATIO
+
V IN
+
1 μ F
the internal precision 0.8V voltage reference by the error
amplifier. The output voltage is given by the equation:
V OUT = 0 . 8 V ? 1 + ?
LTC1876
EXTV CC
V IN
TG1
SW
BG1
C IN
N-CH
BAT85
L1
0.22 μ F
VN2222LL
R SENSE
+
BAT85
BAT85
V OUT
C OUT
? R 2 ?
? R 1 ?
For the auxillary boost regulator, the resultant feedback
signal is compared with the internal precision 1.26V
voltage reference by the error amplifier. The output volt-
age is given by the equation:
V OUTAUX = 1 . 26 V ? 1 +
R 7 ?
PGND
N-CH
1876 F06b
?
?
R 8 ?
?
R 1 MAX ) = 24 k ? ?
Figure 6b. Capacitive Charge Pump for EXTV CC
Topside MOSFET Driver Supply (C B , D B )
External bootstrap capacitors C B connected to the BOOST
pins supply the gate drive voltages for the topside MOS-
FETs. Capacitor C B in the functional diagram is charged
though external diode D B from INTV CC when the SW pin is
low. When one of the topside MOSFETs is to be turned on,
the driver places the C B voltage across the gate-source of
the desired MOSFET. This enhances the MOSFET and
turns on the topside switch. The switch node voltage, SW,
rises to V IN and the BOOST pin follows. With the topside
MOSFET on, the boost voltage is above the input supply:
V BOOST = V IN + V INTVCC . The value of the boost capacitor
C B needs to be 100 times that of the total input capacitance
of the topside MOSFET(s). The reverse breakdown of the
external Schottky diode must be greater than V IN(MAX) .
When adjusting the gate drive level, the final arbiter is the
total input current for the regulator. If a change is made
and the input current decreases, then the efficiency has
improved. If there is no change in input current, then there
is no change in efficiency.
Output Voltage
The LTC1876 output voltages are each set by an external
feedback resistive divider carefully placed across the
output capacitor as shown in Figure 2. For the step-down
controller, the resultant feedback signal is compared with
SENSE + /SENSE – Pins
The common mode input range of the current comparator
SENSE pins is from 0V to (1.1)INTV CC . Continuous linear
operation is guaranteed throughout this range allowing
output voltage setting from 0.8V to 7.7V, depending upon
the voltage applied to EXTV CC . A differential NPN input
stage is biased with internal resistors from an internal 2.4V
source as shown in the Functional Diagram. This requires
that current either be sourced or sunk from the SENSE
pins depending on the output voltage. If the output voltage
is below 2.4V current will flow out of both SENSE pins to
the main output. The output can be easily preloaded by the
V OUT resistive divider to compensate for the current
comparator’s negative input bias current. The maximum
current flowing out of each pair of SENSE pins is:
I SENSE+ + I SENSE– = (2.4V – V OUT )/24k
Since V OSENSE is servoed to the 0.8V reference voltage, we
can choose R1 in Figure 2 to have a maximum value to
absorb this current.
? 0 . 8 V ?
? 2 . 4 V – V OUT ?
for V OUT < 2.4V
Regulating an output voltage of 1.8V, the minimum value
of R1 should be 32k. Note that for an output voltage above
2.4V, R1 has no maximum value since the SENSE pins
load the output.
1876fa
20
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1876EG#PBF | IC REG CTRLR BST PWM CM 36-SSOP |
| CAT809MTBI-T3 | IC VOLTAGE SUPERVISOR SOT-23-3 |
| ELL-3GM3R9N | COIL PWR CHOKE 3.9UH 940MA SMD |
| CAT809JTBI-T3 | IC VOLTAGE SUPERVISOR SOT-23-3 |
| ELL-3GM3R3N | COIL PWR CHOKE 3.3UH 980MA SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1876EG#PBF | 功能描述:IC REG CTRLR BST PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC1876EG#TR | 功能描述:IC REG CTRLR BST PWM CM 36-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC1876EG#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC1877EMS8 | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1877EMS8#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
发布紧急采购，3分钟左右您将得到回复。