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參數資料
| 型號： | TPS62321YEDR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 500-mA, 3-MHz SYNCHRONOUS STEP-DOWN CONVERTER IN CHIP SCALE PACKAGING |
| 中文描述： | 500毫安，3 MHz的同步降壓轉換器芯片級封裝 |
| 文件頁數： | 16/31頁 |
| 文件大小： | 1635K |
| 代理商： | TPS62321YEDR |
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LOW-DROPOUT OPERATION 100% DUTY CYCLE
In 100% duty cycle mode, the TPS6230x, TPS6231x, and TPS6232x offer a low input-to-output voltage
difference. In this mode, the P-channel MOSFET is constantly turned on. This is particularly useful in
battery-powered applications to achieve the longest operation time by taking full advantage of the whole battery
voltage range. The minimum input voltage to maintain regulation, depending on the load current and output
voltage, can be calculated as:
V
I(MIN)
= V
O(MAX)
+ I
O(MAX)
x (r
DS(on) MAX
+ R
L
)
I
O(MAX)
: Maximum output current
r
DS(on) MAX
: Maximum P-channel switch r
DS(on)
R
L
: DC resistance of the inductor
V
O(MAX)
: nominal output voltage plus maximum output voltage tolerance
ENABLE
The device starts operation when EN is set high and starts up with the soft start as previously described.
Pulling the EN pin low forces the device into shutdown, with a shutdown quiescent current of typically 0.1
μ
A. In
this mode, the P and N-channel MOSFETs are turned off, the internal resistor feedback divider is disconnected,
and the entire internal-control circuitry is switched off. When an output voltage is present during shutdown mode,
which can be caused by an external voltage source or super capacitor, the reverse leakage is specified under
electrical characteristics. For proper operation, the EN pin must be terminated and must not be left floating.
In addition, the TPS6232x devices integrate a resistor, typically 35
, to actively discharge the output capacitor
when the device turns off. The required time to discharge the output capacitor at V
O
depends on load current.
UNDERVOLTAGE LOCKOUT
The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the
converter from turning on the switch or rectifier MOSFET under undefined conditions.
SHORT-CIRCUIT PROTECTION
As soon as the output voltage falls below 50% of the nominal output voltage, the converter current limit is
reduced by 50% of the nominal value. Because the short-circuit protection is enabled during start-up, the device
does not deliver more than half of its nominal current limit until the output voltage exceeds 50% of the nominal
output voltage. This needs to be considered when a load acting as a current sink is connected to the output of
the converter.
THERMAL SHUTDOWN
As soon as the junction temperature, T
, exceeds typically 150
°
C, the device goes into thermal shutdown. In this
mode, the P- and N-channel MOSFETs are turned off. The device continues its operation when the junction
temperature falls below typically 130
°
C again.
TPS62300, TPS62301, TPS62302
TPS62303, TPS62305, TPS62311
TPS62313, TPS62320, TPS62321
SLVS528B–JULY 2004–REVISED JUNE 2005
DETAILED DESCRIPTION (continued)
The TPS6231x devices have a UVLO threshold set to 2 V (typical). Fully functional operation is permitted down
to 2.4 V input voltage. EN is set low for input voltages lower than 2.4 V to avoid the possibility of misoperation.
TPS6231x devices are to be considered where the user requires direct control of the turn-off sequence as part of
a larger power management system.
16
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS62321YEDT | 功能描述:開關變換器、穩壓器與控制器 1.5V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS62321YZDR | 功能描述:直流/直流開關調節器 1.5V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62321YZDT | 功能描述:直流/直流開關調節器 1.5V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62350EVM-201 | 功能描述:電源管理IC開發工具 STEP DOWN CONVERTER RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS62350YZGR | 功能描述:直流/直流開關調節器 Adj. 800mA 3MHz Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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