- 您现在的位置：买卖IC网 > PDF目录20391 > DC1453A (Linear Technology)BOARD EVAL LTM4619 PDF资料下载
参数资料
| 型号： | DC1453A |
| 厂商： | Linear Technology |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LTM4619 |
| 软件下载： | LTM4619 Spice Model |
| 设计资源： | DC1453A Design Files DC1453A Schematic |
| 标准包装： | 1 |
| 系列： | LTM®, uModule® |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 1.8V，3.3V |
| 电流 - 输出： | 4A |
| 输入电压： | 4.5 ~ 28 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM4619 |
| 相关产品： | LTM4619IV#PBF-ND - IC SWIT REG BUCK 4A ADJ 144LGA LTM4619EV#PBF-ND - IC SWIT REG BUCK 4A ADJ 144LGA |
LTM4619
APPLICATIONS INFORMATION
V OUT = 0.8V ?
I CIN(RMS) =
I OUT(MAX)
η
R SET =
– 1 ?
? ?
The typical LTM4619 application circuit is shown in
Figure 18. External component selection is primarily deter-
mined by the maximum load current and output voltage.
Output Voltage Programming
The PWM controller has an internal 0.8V reference voltage.
As shown in the block diagram, a 60.4k internal feedback
resistor R FB connects V OUT to V FB pin. The output voltage
will default to 0.8V with no feedback resistor. Adding a
resistor R SET from V FB pin to SGND programs the output
voltage:
60.4k + R SET
R SET
or equivalently
60.4k
? V OUT ?
0.8V ?
Table 1. R SET Resistor Table vs Various Output Voltages
V OUT (V) 0.8 1.2 1.5 1.8 2.5 3.3 5
R SET (k Ω ) Open 121 68.1 48.7 28.0 19.1 11.5
Input Capacitors
The LTM4619 module should be connected to a low AC-
impedance DC source. Two 1.5μF input ceramic capacitors
are included inside the module. Additional input capacitors
are needed if a large load is required up to the 4A level.
A 47μF to 100μF surface mount aluminum electrolytic
capacitor can be used for more input bulk capacitance.
This bulk capacitor is only needed if the input source im-
pedance is compromised by long inductive leads, traces
or not enough source capacitance.
For a buck converter, the switching duty-cycle can be
estimated as:
Without considering the inductor ripple current, for each
output, the RMS current of the input capacitor can be
estimated as:
? D ?(1 ? D)
In the above equation, η is the estimated efficiency of the
power module. The bulk capacitor can be a switcher-rated
aluminum electrolytic capacitor or a polymer capacitor. One
10μF ceramic input capacitor is typically rated for 2A of
RMS ripple current, so the RMS input current at the worst
case for each output at 4A maximum current is about 2A.
If a low inductance plane is used to power the device, then
two 10μF ceramic capacitors are enough for both outputs
at 4A load and no external input bulk capacitor is required.
Output Capacitors
The LTM4619 is designed for low output voltage ripple
noise. The bulk output capacitors defined as C OUT are
chosen with low enough effective series resistance (ESR)
to meet the output voltage ripple and transient require-
ments. C OUT can be a low ESR tantalum capacitor, a low
ESR polymer capacitor or ceramic capacitor. The typical
output capacitance range for each output is from 47μF
to 220μF. Additional output filtering may be required by
the system designer. If further reduction of output ripple
or dynamic transient spikes is required, LTpowerCAD is
available for stability analysis. Multiphase operation will
reduce effective output ripple as a function of the num-
ber of phases. Application Note 77 discusses this noise
reduction versus output ripple current cancellation, but
the output capacitance should be considered carefully as
a function of stability and transient response. LTpowerCAD
calculates the output ripple reduction as the number of
implemented phases increased by N times.
D =
V OUT
V IN
4619fb
For more information www.linear.com/LTM4619
9
相关PDF资料 |
PDF描述 |
|---|---|
| IR2153STR | IC DRVR HALF BRDG SELF-OSC 8SOIC |
| EL7158IS-T13 | IC PIN DRIVER 40MHZ 3ST 8-SOIC |
| RY-1215S | CONV DC/DC 1W 12VIN 15VOUT |
| R0.25D12-3.305/H-R | CONV DC/DC 0.25W 3.3VIN +/-5VOUT |
| EYM08DTAD-S189 | CONN EDGECARD 16POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DC1459A | 功能描述:BOARD EVALUATION FOR LTC3588 RoHS:否 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板 |
| DC1459B-A | 制造商:Linear Technology 功能描述:ENERY HARVESTING EVAL. BOARD 制造商:Linear Technology 功能描述:LTC3588, ENERGY HARVESTING PWR SUPPLY, DEMO BOARD; Silicon Manufacturer:Linear Technology; Kit Application Type:Power Management; Application Sub Type:Energy Harvesting; Kit Contents:Board |
| DC1459B-B | 制造商:Linear Technology 功能描述:EVAL BOARD, LTC3588 ENERGY HARVESTING PO 制造商:Linear Technology 功能描述:EVAL BOARD, LTC3588 ENERGY HARVESTING POWER SUPPLY; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC3588; Kit Application Type:Power Management; Application Sub Type:Energy Harvesting; Kit Contents:Board, Guide |
| DC1460A | 制造商:Linear Technology 功能描述:EVAL BOARD, LTC3620 BUCK REGULATOR, Silicon Manufacturer:Linear Technology, Sili |
| DC1466A-A | 功能描述:BOARD DAC LTC2636-12 RoHS:是 类别:编程器，开发系统 >> 评估板 - 数模转换器 (DAC) 系列:QuikEval™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- DAC 的数量:4 位数:12 采样率（每秒）:- 数据接口:串行，SPI? 设置时间:3µs DAC 型:电流/电压 工作温度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
发布紧急采购，3分钟左右您将得到回复。