參數(shù)資料
型號(hào)： E910.27A
廠商： ELMOS SEMICONDUCTOR AG
英文描述： External Adjustable High Efficiency PFM Step-Down Converter
中文描述： 外部可調(diào)式高效率PFM升壓型轉(zhuǎn)換器
文件頁(yè)數(shù)： 1/50頁(yè)
文件大?。?/td> 1063K
代理商： E910.27A
- Preliminary -
E910.27A
External Adjustable High Efficiency PFM Step-Down Converter
Features
More than 90% efficiency and 100% duty cycle
Wide input voltage range from 5V to 40V
Integrated 1.6A on-chip P-channel MOS power switch
12μA typical shutdown current
Less than 0.5V drop voltage at 500mA output current
0.2V to Vinput adjustable output range
Controllable VOUT via an external Reference
No control loop compensation required
Improved current-limited PFM converter
Maximum operating frequency > 300kHz
Power good, reset or watchdog signal
Under-voltage lockout and thermal shutdown
-40°C to 125°C junction temperature
Available in thermally enhanced TSSOP24 package
Applications
Automotive electronics
Minimum component step-down converter
Sequenceable POL power supply systems
Externally controllable LED power supply
Externally controllable power amplifier
Brief Functional Description
The easy to use hysteretic step-down converter provides high
efficiency over a wide load and input range with few external
components.
An advanced PFM control scheme gives this device the bene-
fits of a PWM converter with high efficiency at heavy loads,
while using very low operating current at light loads to maintain
an excellent behaviour over load variation.
Maximum switching frequency of 300kHz permits small exter-
nal components and operation to 100% duty cycle allows the
lowest possible dropout voltage. For optimal flexibility an exter-
nal shunt resistor sets the maximum output current.
The converter contains a selectable internal reference with
high or low voltage to regulate a wide range of output voltage
or output current. The reference for output regulation can also
be provided from an external source, like DAC.
A selectable power good, reset or watchdog signal is provided.
An external capacitor sets the reset output pulse duration and /
or watchdog trigger time.
An optional internal short delay timeout can greatly reduce the
losses of the whole application in case of short or overload.
Very low shutdown and quiescent currents and the wide input
voltage range makes the converter ideal for battery powered
systems.
ELMOS Semiconductor AG
Specification 1 / 50
03SP0357E.00 05.09.2006
Typical Application
VINPUT
VOUTPUT
CIN
RS
CDR
COUT
LCK
RFB1
RFB2
CSM
DSW
ENPS
SMON, RSEL
VSM
CDRV
RSIN
SWD
R
R
V
G
P
V
E91027
DAC
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