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參數(shù)資料
| 型號： | TPS2500DRCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 1075 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, 0.90 MM HEIGHT, PLASTIC, SON-10 |
| 文件頁數(shù)： | 3/41頁 |
| 文件大?。?/td> | 1641K |
| 代理商： | TPS2500DRCR |
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TJ Junction Temperature °C
0
1
2
3
4
5
6
50
0
50
100
150
I q
Bias
Current
A
G007
VIN = 3.3 V
VIN Input Voltage V
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
I q
Bias
Current
A
G008
TJ = 40°C
TJ = 85°C
TJ = 25°C
www.ti.com
SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010
TYPICAL CHARACTERISTICS (continued)
Figure 9. Bias Current vs Junction Temperature,
Figure 10. Bias Current vs Input Voltage,
VIN = 3.3 V, VEN = 0 V (Disabled)
VEN = 0 V (Disabled)
THEORY OF OPERATION
DESCRIPTION
This device targets applications for host-side USB devices where a 5-V power rail, required for USB operation, is
unavailable. The TPS2500 integrates the functionality of a synchronous boost converter and a single USB switch
into a monolithic integrated circuit so that lower-voltage rails can be used directly to provide USB power. An
additional feature is that the auxiliary 5-V power rail is brought external to the device to power non-USB loads in
addition to the integrated USB switch.
The boost converter is highly integrated, including the switching MOSFETs (low-side N-channel, high-side
synchronous P-channel), gate-drive and analog-control circuitry, and control-loop compensation. Additional
features include high-efficiency light-load operation, overload and short-circuit protection, and controlled
monotonic soft start. The USB switch integrates all necessary functions, including back-to-back series N-channel
MOSFETs, charge-pump gate driver, and analog control circuitry. The current-limit protection is user-adjustable
by selecting the RILIM resistor from ILIM to GND.
The only external components required are the boost inductor, current-limit setting resistor, and input and output
capacitors for the boost converter.
BOOST CONVERTER
Start-Up
Input power to the TPS2500 is provided from IN to GND. The device has an undervoltage lockout (UVLO) circuit
that disables the device until the voltage on IN exceeds 2.15 V (typical). The TPS2500 goes through its normal
start-up process and attempts to regulate the AUX voltage to 5.1 V (typical).
The boost converter has a two-step start-up sequence. Step one is a constant-current mode that regulates the
current through the high-side P-channel MOSFET to ISTART (2.65 A typical). ISTART provides power to the load and
charges the output capacitance on VAUX until VAUX reaches VIN – VEXIT. The converter begins to switch once VAUX
exceeds VIN – VEXIT. The initial duty cycle of the device is limited by a closed-loop soft start that ramps the
reference voltage to the internal error amplifier to provide a controlled, monotonic start-up on VAUX. The boost
converter goes through this cycle any time the voltage on VAUX drops below VIN – VEXIT due to overload
conditions or the boost converter re-enables after normal shutdown.
Copyright 2008–2010, Texas Instruments Incorporated
11
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| TPS2500DRCT | 功能描述:電源開關(guān) IC - USB Integr USB Pwr Sw w/ Boost Converter RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2500EVM-337 | 功能描述:電源管理IC開發(fā)工具 Eval Mod for TPS2500 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS-250-10 | 制造商:PennEngineering (PEM) 功能描述: 制造商: 功能描述: 制造商:undefined 功能描述: |
| TPS2501DRCR | 功能描述:電源開關(guān) IC - USB Integr USB Pwr Sw RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2501DRCT | 功能描述:電源開關(guān) IC - USB Integr USB Pwr Sw RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
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