參數(shù)資料
型號(hào)： TPS62240DRV
廠商： Texas Instruments, Inc.
英文描述： 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package
中文描述： 2.25兆赫300毫安降壓轉(zhuǎn)換器2x2SON/TSOT23包
文件頁(yè)數(shù)： 14/29頁(yè)
文件大小： 859K
代理商： TPS62240DRV
www.ti.com
Output voltage
V
OUT
nominal
PWM + PFM
Light load
PFM Mode
moderate to heavy load
PWM Mode
100% Duty Cycle Low Dropout Operation
UNDERVOLTAGE LOCKOUT
The undervoltage lockout circuit prevents the device from malfunctioning at low input voltages and from
excessive discharge of the battery and disables the output stage of the converter. The under-voltage lockout
threshold is typically 1.85V with falling V
IN
.
MODE SELECTION
The MODE pin allows mode selection between forced PWM mode and Power Save Mode.
ENABLE
The device is enabled setting EN pin to high. During the start up time t
Start Up
the internal circuits are settled and
the soft start circuit is activated. The EN input can be used to control power sequencing in a system with various
dc/dc converters. The EN pin can be connected to the output of another converter, to drive the EN pin high and
getting a sequencing of supply rails. With EN pin = GND, the device enters shutdown mode in which all circuits
are disabled. In fixed output voltage versions, the internal resistor divider network is then disconnected from FB
pin.
TPS62240, TPS62242, TPS62243
SLVS762B–JUNE 2007–REVISED SEPTEMBER 2007
Figure 26. Power Save Mode
The device starts to enter 100% duty cycle mode once the input voltage comes close to the nominal output
voltage. In order to maintain the output voltage, the High Side MOSFET switch is turned on 100% for one or
more cycles.
With further decreasing V
IN
the High Side MOSFET switch is turned on completely. In this case the converter
offers a low input-to-output voltage difference. This is particularly useful in battery-powered applications to
achieve longest operation time by taking full advantage of the whole battery voltage range.
The minimum input voltage to maintain regulation depends on the load current and output voltage, and can be
calculated as:
V
IN
min = V
O
max + I
O
max
×
(R
DSo(n)
max + R
L
)
With:
I
O
max = maximum output current plus inductor ripple 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
Connecting this pin to GND enables the Power Save Mode with automatic transition between PWM and PFM
mode. Pulling the MODE pin high forces the converter to operate in fixed frequency PWM mode even at light
load currents. This allows simple filtering of the switching frequency for noise sensitive applications. In this mode,
the efficiency is lower compared to the Power Save Mode during light loads.
The condition of the MODE pin can be changed during operation and allows efficient power management by
adjusting the operation mode of the converter to the specific system requirements.
14
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Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s):
TPS62240 TPS62242 TPS62243
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TPS62240DRVRG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS62240DRVT 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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TPS62240EVM-229 功能描述:電源管理IC開(kāi)發(fā)工具 TPS62240 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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