- 您现在的位置：买卖IC网 > PDF目录15237 > LTC1629IG-PG (Linear Technology)IC REG CTRLR BUCK PWM CM 28-SSOP PDF资料下载
参数资料
| 型号： | LTC1629IG-PG |
| 厂商： | Linear Technology |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 47 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 360kHz |
| 占空比： | 99.5% |
| 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 |
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页当前第17页第18页第19页第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
LTC1629/LTC1629-PG
APPLICATIO S I FOR ATIO
OPTIONAL EXTV CC CONNECTION
5V < V SEC < 7V +
V IN
C IN
+
V IN
C IN
+
C IN
LTC1629
V IN
1N4148
V SEC
V IN
TG1
BAT85
0.22 μ F
BAT85
EXTV CC
TG1
SW1
BG1
N-CH
T1
6.8V
+
R SENSE
+
1 μ F
V OUT
C OUT
EXTV CC
LTC1629
SW1
BG1
N-CH
L1
VN2222LL
R SENSE
+
BAT85
V OUT
C OUT
N-CH
PGND
1629 F05a
Figure 5a. Secondary Output Loop and EXTV CC Connection
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 rises to V IN + V INTVCC .
The value of the boost capacitor C B needs to be 30 to 100
times that of the total input capacitance of the topside
MOSFET(s). The reverse breakdown of D B must be greater
than V IN(MAX).
The final arbiter when defining the best gate drive ampli-
tude level will be the input supply current. If a change is
made that decreases input current, the efficiency has
improved. If the input current does not change then the
efficiency has not changed either.
Output Voltage
The LTC1629 has a true remote voltage sense capablity.
The sensing connections should be returned from the load
back to the differential amplifier’s inputs through a com-
mon, tightly coupled pair of PC traces. The differential
amplifier rejects common mode signals capacitively or
inductively radiated into the feedback PC traces as well as
ground loop disturbances. The differential amplifier out-
put signal is divided down and compared with the internal
precision 0.8V voltage reference by the error amplifier.
The differential amplifier can be used in either of two
configurations according to the voltage applied to the
AMPMD pin. The first configuration, with the connections
illustrated in the Functional Diagram, utilizes a set of
internal precision resistors to enable precision instrumen-
tation-type measurement of the output voltage. This con-
N-CH
PGND
1629 F05b
Figure 5b. Capacitive Charge Pump for EXTV CC
figuration is activated when the AMPMD pin is tied to
ground and is the only configuration available for the
LTC1629-PG. When the AMPMD pin is tied to INTV CC , the
resistors are disconnected and the amplifier inputs are
made directly available. The amplifier can then be used as
a general purpose op amp. The amplifier has a 0V to 3V
common mode input range limitation due to the internal
switching of its inputs. The output is an NPN emitter
follower without any internal pull-down current. A DC
resistive load to ground is required in order to sink current.
The output will swing from 0V to 10V. (V IN ≥ V DIFFOUT + 2V.)
Soft-Start/Run Function
The RUN/SS pin provides three functions: 1) Run/Shut-
down, 2) soft-start and 3) a defeatable short-circuit latchoff
timer. Soft-start reduces the input power sources’ surge
currents by gradually increasing the controller’s current
limit I TH(MAX) . The latchoff timer prevents very short,
extreme load transients from tripping the overcurrent
latch. A small pull-up current (>5 μ A) supplied to the RUN/
SS pin will prevent the overcurrent latch from operating.
The following explanation describes how the functions
operate.
An internal 1.2 μ A current source charges up the C SS
capacitor . When the voltage on RUN/SS reaches 1.5V, the
controller is permitted to start operating. As the voltage on
RUN/SS increases from 1.5V to 3.0V, the internal current
limit is increased from 25mV/R SENSE to 75mV/R SENSE .
The output current limit ramps up slowly, taking an
additional 1.4 μ s/ μ F to reach full current. The output cur-
17
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3703IGN-5#PBF | IC REG CTRLR BST PWM VM 16-SSOP |
| LT3757MPMSE#TRPBF | IC REG CTRLR PWM CM 10-MSOP |
| NCP304HSQ30T1G | IC VOLT DETECT CMOS 3.0V SC-82AB |
| ISC1210EB150J | INDUCTOR WW 15UH 5% 1210 |
| LTC3890HUH#TRPBF | IC REG CTRLR BUCK PWM CM 32-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1629IG-PG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-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 |
| LTC1629IG-PG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 28-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 |
| LTC1629IG-PG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-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 |
| LTC1642ACGN | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 16.5V 16-Pin SSOP N |
| LTC1642ACGN#PBF | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。