--- 產(chǎn)品詳情 ---
Regulated outputs (#) | 3 |
Vin (Min) (V) | 4.5 |
Vin (Max) (V) | 18 |
Iout (Max) (A) | 3 |
Rating | Catalog |
LDO | 1 |
Iq (Typ) (mA) | 20 |
Features | Adjustable Current Limit, Enable, Frequency Synchronization, Power Good, Synchronous Rectification, UVLO Adjustable, Soft Start Adjustable |
Shutdown current (ISD) (Typ) (uA) | 1300 |
Configurability | Hardware configurable, User programmable |
- Wide Input Supply Voltage Range
(4.5 V - 18 V) - 0.8 V, 1% Accuracy Reference
- Continuous Loading: 3 A (Buck 1),
2 A (Buck 2 and 3) - Maximum Current: 3.5 A (Buck 1),
2.5 A (Buck 2 and 3) - Adjustable Switching Frequency
300 kHz - 2.2 MHz Set By External Resistor - External Synchronization Pin for Oscillator
- External Enable/Sequencing and Soft Start Pins
- Adjustable Current Limit Set By External Resistor
- Soft Start Pins
- Current-Mode Control With Simple Compensation Circuit
- Power Good and Reset Generator
- Storage and Release Circuit Optimized for Reduction of Storage
Capacitance in Dying Gasp Mode (Option) - Low Power Mode Set By External Signal
- QFN Package, 40-Pin 6 mm x 6 mm RHA
- APPLICATIONS
- xDSL/xPON Modems
- Cable Modems
- Power Line Modem
- Home Gateway and Access Point Networks
- Wireless Routers
- Set Top Box
The TPS65250 features three synchronous wide input range high efficiency buck converters. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.
The converters can operate in 5-, 9-, 12- and 15-V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 0.8 V and the input supply minus 1 V. Each converter features enable pin that allows a delayed start-up for sequencing purposes, soft start pin that allows adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The COMP pin allows optimizing transient versus dc accuracy response with a simple RC compensation.
The switching frequency of the converters can either be set with an external resistor connected to ROSC pin or can be synchronized to an external clock connected to SYNC pin if needed. The switching regulators are designed to operate from 300 kHz to 2.2 MHz. Both Bucks 2 and Buck 3 run in-phase and 180° out of phase with Buck 1 to minimize input filter requirements.
TPS65250 features a unique storage and release circuitry for dying gasp mode. The storage capacitor is separated from input capacitor during normal operation. The storage and release circuit will charge the storage capacitor with a controlled circuit to reduce the inrush current from the adaptor supply to a storage voltage of 20 V to accumulate as much energy as possible taking advantage of the 1/2 CV2 feature.
TPS65250 continuously monitors the input voltage. Once the input voltage drops below a release voltage of 10.5 V, the circuit tries to transfer charge from storage capacitor to the input capacitor keeping the input voltage closer to release value for as long as possible. The release voltage should be set lower than the processor dying gasp detect voltage. This feature greatly reduces the capacitance required to support the dying gasp operation. The storage and release circuitry is completely on chip except for the charge and storage capacitors. The control circuit makes sure that the current charging the storage capacitor is limited during power up and the storage capacitor is fully charged to its target value before the end of reset (PGOOD pin) flag to the processor is released. The circuit also features a flag signal issued to the host circuit to indicate that the ?dump? stage is in process (GASP pin). This signal can be used to initiate the dying gasp process and reduce the system complexity. During the release process Buck 3 must stay enabled, but Buck 1 and Buck 2 can be disabled to maximize the release time.
TPS65250 features a supervisor circuit that monitors Buck 1 and Buck 3 output voltage and generates an internal power good (PG) signal. The PGOOD pin is asserted once sequencing is done, all PG signals are reported and a selectable end of reset time lapses. The polarity of the PGOOD signal is active high.
TPS65250 also features a low power mode enabled by an external signal, which allows for a reduction on the input power supplied to the system when the host processor is in stand-by (low activity) mode.
TPS65250 is packaged in a small, thermally efficient QFN RHA40 package.
為你推薦
-
TI數(shù)字多路復(fù)用器和編碼器SN54HC1512022-12-23 15:12
-
TI數(shù)字多路復(fù)用器和編碼器SN54LS1532022-12-23 15:12
-
TI數(shù)字多路復(fù)用器和編碼器CD54HC1472022-12-23 15:12
-
TI數(shù)字多路復(fù)用器和編碼器CY74FCT2257T2022-12-23 15:12
-
TI數(shù)字多路復(fù)用器和編碼器SN74LVC257A2022-12-23 15:12
-
TI數(shù)字多路復(fù)用器和編碼器SN74LVC157A2022-12-23 15:12
-
TI數(shù)字多路復(fù)用器和編碼器SN74ALS258A2022-12-23 15:12
-
TI數(shù)字多路復(fù)用器和編碼器SN74ALS257A2022-12-23 15:12
-
TI數(shù)字多路復(fù)用器和編碼器SN74ALS157A2022-12-23 15:12
-
TI數(shù)字多路復(fù)用器和編碼器SN74AHCT1582022-12-23 15:12
-
【PCB設(shè)計必備】31條布線技巧2023-08-03 08:09
相信大家在做PCB設(shè)計時,都會發(fā)現(xiàn)布線這個環(huán)節(jié)必不可少,而且布線的合理性,也決定了PCB的美觀度和其生產(chǎn)成本的高低,同時還能體現(xiàn)出電路性能和散熱性能的好壞,以及是否可以讓器件的性能達到最優(yōu)等。在上篇內(nèi)容中,小編主要分享了PCB線寬線距的一些設(shè)計規(guī)則,那么本篇內(nèi)容,將針對PCB的布線方式,做個全面的總結(jié)給到大家,希望能夠?qū)︷B(yǎng)成良好的設(shè)計習(xí)慣有所幫助。1走線長度1276瀏覽量 -
電動汽車直流快充方案設(shè)計【含參考設(shè)計】2023-08-03 08:08
-
Buck電路的原理及器件選型指南2023-07-31 22:28
-
100W USB PD 3.0電源2023-07-31 22:27
-
千萬不要忽略PCB設(shè)計中線寬線距的重要性2023-07-31 22:27
想要做好PCB設(shè)計,除了整體的布線布局外,線寬線距的規(guī)則也非常重要,因為線寬線距決定著電路板的性能和穩(wěn)定性。所以本篇以RK3588為例,詳細為大家介紹一下PCB線寬線距的通用設(shè)計規(guī)則。要注意的是,布線之前須把軟件默認設(shè)置選項設(shè)置好,并打開DRC檢測開關(guān)。布線建議打開5mil格點,等長時可根據(jù)情況設(shè)置1mil格點。PCB布線線寬01布線首先應(yīng)滿足工廠加工能力,1139瀏覽量 -
基于STM32的300W無刷直流電機驅(qū)動方案2023-07-06 10:02
如何驅(qū)動無刷電機?近些年,由于無刷直流電機大規(guī)模的研發(fā)和技術(shù)的逐漸成熟,已逐步成為工業(yè)用電機的發(fā)展主流。圍繞降低生產(chǎn)成本和提高運行效率,各大廠商也提供不同型號的電機以滿足不同驅(qū)動系統(tǒng)的需求?,F(xiàn)階段已經(jīng)在紡織、冶金、印刷、自動化生產(chǎn)流水線、數(shù)控機床等工業(yè)生產(chǎn)方面應(yīng)用。無刷直流電機的優(yōu)點與局限性優(yōu)點:高輸出功率、小尺寸和重量、散熱性好、效率高、運行速度范圍寬、低 -
上新啦!開發(fā)板僅需9.9元!2023-06-21 17:43
-
參考設(shè)計 | 2KW AC/DC數(shù)字電源方案2023-06-21 17:43
-
千萬不能小瞧的PCB半孔板2023-06-21 17:34