- 您现在的位置：买卖IC网 > PDF目录68420 > TPS62734DRYT (TEXAS INSTRUMENTS INC) SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO6 PDF资料下载
参数资料
| 型号： | TPS62734DRYT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1 X 1.50 MM, 0.60 MM HEIGHT, PLASTIC, MO-287UFAD, SON-6 |
| 文件页数： | 13/27页 |
| 文件大小： | 4698K |
| 代理商： | TPS62734DRYT |
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页当前第13页第14页第15页第16页第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
(
)
DC
OUT
IN
CDEC
COUT
CDEC
COUT
V
C
dQ
_
-
=
(
)
2
_
2
_
2
1
_
arg
DC
OUT
IN
CDEC
COUT
Loss
e
Ch
V
C
E
-
=
SLVSAC3
– MAY 2011
ADDITIONAL DECOUPLING CAPACITORS
In addition to the output capacitor there are further decoupling capacitors connected to the output of the
TPS62730. These decoupling capacitor are placed closely at the RF transmitter or micro controller. The total
capacitance of these decoupling capacitors should be kept to a minimum and should not exceed the values given
in the reference designs, see Figure 31 and Figure 32. During mode transition from DC/DC operation to bypass
mode the capacitors on the output VOUT are charged up to the battery voltage VIN via the internal bypass
switch. During mode transition from bypass mode to DC/DC operation, these capacitors need to be discharged
by the system supply current to the nominal output voltage threshold until the DC/DC will kick in. The charge
change in the output and decoupling capacitors can be calculated according to Equation 6. The energy loss due
to charge/discharge of the output and decoupling capacitors can be calculated according to Equation 7
(6)
(7)
with
dQCOUT_CDEC : Charge change needed to charge up / discharge the output and decoupling capacitors from
VOUT_DC_DC to VIN and vice versa
CCOUT_CDEC: Total capacitance on the VOUT pin of the device, includes output and decoupling capacitors
VIN: Input (battery) voltage
VOUT_DC_DC: nominal DC/DC output voltage VOUT
INPUT CAPACITOR SELECTION
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is
required for best input voltage filtering to ensure proper function of the device and to minimize input voltage
spikes. For most applications a 2.2
F to 4.7F ceramic capacitor is recommended. The input capacitor can be
increased without any limit for better input voltage filtering.
Table 2 shows a list of tested input/output capacitors.
INPUT BUFFER CAPACITOR SELECTION
In addition to the small ceramic input capacitor a larger buffer capacitor CBuf is recommended to reduce voltage
drops and ripple voltage. When using battery chemistries like Li-SOCl2, Li-SO2, Li-MnO2, the impedance of the
battery has to be considered. These battery types tend to increase their impedance depending on discharge
status and often can support output currents of only a few mA. Therefore a buffer capacitor is recommended to
stabilize the battery voltage during DC/DC operations e.g. for a RF transmission. A voltage drop on the input of
the TPS62730 during DC/DC operation impacts the advantage of the step down conversion for system power
reduction. Furthermore the voltage drops can fall below the minimum recommended operating voltage of the
device and leads to an early system cut off. Both impacts effects reduce the battery life time. To achieve best
performance and to extract most energy out of the battery a good procedure is to design the select the buffer
capacitor value for an voltage drop below 50mVpp during DC/DC operation. The capacitor value strongly
depends on the used battery type, as well the current consumption during a RF transmission as well the duration
of the transmission.
Table 2. List of Capacitor
CAPACITANCE [
μF]
SIZE
CAPACITOR TYPE
SUPPLIER
2.2
0402
GRM155R60J225
Murata
CHECKING LOOP STABILITY
The first step of circuit and stability evaluation is to look from a steady-state perspective at the following signals:
Switching node, SW
Inductor current, IL
Output ripple voltage, VOUT(AC)
20
Copyright
2011, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| TPS62735DRYR | SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO6 |
| TPS62731DRYT | SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO6 |
| TPS62730DRYR | SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO6 |
| TPS65165RSBR | 6.6 A SWITCHING REGULATOR, 720 kHz SWITCHING FREQ-MAX, QCC40 |
| TS3A5017DRE4 | DUAL 4-CHANNEL, SGL ENDED MULTIPLEXER, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS62736EVM-205 | 功能描述:电源管理IC开发工具 TPS62736 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS62736RGYR | 功能描述:直流/直流开关转换器 Hi Eff Nanopower Buck Cnvtr RoHS:否 制造商:Texas Instruments 最大输入电压:5.5 V 开关频率:2 MHz 输出电压: 输出电流:50 mA 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT |
| TPS62736RGYT | 功能描述:直流/直流开关转换器 Hi Eff Nanopower Buck Cnvtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS62737RGYR | 功能描述:Buck Switching Regulator IC Positive Programmable 1.3V 1 Output 200mA 14-VFQFN Exposed Pad 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可编程 输出数:1 电压 - 输入（最小值）:2V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.3V 电压 - 输出（最大值）:5V 电流 - 输出:200mA 频率 - 开关:2MHz 同步整流器:是 工作温度:-20°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:14-VFQFN 裸露焊盘 供应商器件封装:14-VQFN（3.5x3.5） 标准包装:1 |
| TPS62737RGYT | 制造商:Texas Instruments 功能描述:IC REG BUCK ADJ 200MA 14VQFN 制造商:Texas Instruments 功能描述:IC LOW POWER BUCK CONV 2MHZ 制造商:Texas Instruments 功能描述:IC, LOW POWER BUCK CONV, 2MHZ, VQFN-16 制造商:Texas Instruments 功能描述:Voltage Regulators - Switching Regulators Progr Output Vltg UL Pwr Buck Cnvrtr 制造商:Texas Instruments 功能描述:Ultra Low Power Harvester-200MA 制造商:Texas Instruments 功能描述:IC, LOW POWER BUCK CONV, 2MHZ, VQFN-16, Primary Input Voltage:5.5V, No. of Outpu 制造商:Texas Instruments 功能描述:DC-DC CONV, BUCK, ADJ, 2.5MHZ, VQFN-14, Primary Input Voltage:5.5V, No. of Outputs:1, Output Voltage:5V, Output Current:200mA, No. of Pins:14, Operating Temperature Min:-20C, Operating Temperature Max:85C, MSL:MSL 2 - 1 year , RoHS Compliant: Yes |
发布紧急采购，3分钟左右您将得到回复。