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YX605 데이터시트 PDF




Huajing Electronics에서 제조한 전자 부품 YX605은 전자 산업 및 응용 분야에서
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부품번호 YX605 기능
기능 LOW INPUT HIGH EFFICIENCY SYNCHRONOUS STEP-UP CONVERTER
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YX605 데이터시트, 핀배열, 회로
YX605
NOLSUOYSWNCISHNRPTOUETNPOH-UIGUSHPSETFCEFPOIC-UINEPNVCCOEYNRVTERETRER
V1.0
SYNCHROLOW INPUT HIGH EFFICIENCY
FEATURES
GENERAL DESCRIPTION
Up to 0.9V Startup Voltage
Up to 94% Efficiency
Internal Power Switch
3.3V and 5V Fixed or Adjustable Output
Voltage
Zero Supply Current Shutdown Mode
Tiny SOT 23-5 Package
APPLICATIONS
Hand-Held Devices
One to Three Cell Battery Operated Devices
PDAs
Cellular Phones
Digital Cameras
GPS
The YX6 0 5 Low Input High Efficiency
Synchronous Step-Up Converter is capable of
delivering more than 400mA output current using
only three external components.
Typical startup voltage is 0.95V and the
device can operate down to a 0.6V input voltage.
Incorporating an internal synchronous rectifier,
the YX6 0 5 can achieve high efficiency of up to
94%. Variable switching frequency operation
results in high efficiency for a wide range of
loads.
The output voltage is selectable between
3.3V and 5V, or can be externally set to any
voltage between 2V and 5V. The YX6 0 5 is
available in the tiny SOT23-5 Package.
Figure 1. Typical Application Circuit
. -1-
MAR 2013




YX605 pdf, 반도체, 판매, 대치품
Figure 2. Functional Block Diagram
YX605
NOLSUOYSWNCISHNRPTOUETNPOH-UIGUSHPSETFCEFPOIC-UINEPNVCCOEYNRVTERETRER
V1.0
FUNCTIONAL DESCRIPTION
The YX60 5 comprises a reference,
feedback select error comparator, control logic
and timers, internal power MOSFETs and current
comparators. The Functional Block Diagram is
shown in Figure 2.
MAIN CONTROL LOOP
The YX 605 uses the maximum ON
time/minimum OFF time step-up architecture. An
error comparator monitors the FB voltage. When
FB is below the reference voltage and the 1µs
minimum OFF time is exceeded, the latch is set
and an ON cycle is initiated. During this period,
the N-channel power switch is turned on to
connect the LX node to ground. By doing so, the
energy is transferred from supply to the inductor.
Once the 5µs maximum ON time is exceeded or
the 1A current limit is reached, the N-channel
power switch is turned off and the OFF cycle
begins. During OFF cycle the energy stored in
the inductor is released into the load through the
synchronous rectifier. After the minimum OFF
time, if FB voltage drops below the reference
voltage, the IC transitions to the ON cycle again.
LIGHT LOAD OPERATION
At light load, the IC enters power-saving
mode by extending the OFF time, resulting in
high efficiency across a wide load range.
START UP
The YX 605 uses a proprietary start-up
scheme to ensure device start up at a very low
supply voltage down to 0.95V. The device stays
in the startup mode until VOUt passes 1.85V.
During this start-up period, the maximum ON
and minimum OFF times are extended.
SHUTDOWN
In shutdown, all internal circuits are disabled.
The power switch and the synchronous rectifier
are turned off. A DC path from the input supply to
the output still exists in shutdown due to the body
diode of the synchronous rectifier when output is
lower than input by one diode drop.
APPLICATION INFORMATION
OUTPUT VOLTAGE SELECTION
By connecting FB differently, three options
are available for output voltages: fixed 3.3V, 5V
or an adjustable voltage set by an external
resistive divider. (Figure 3).
. -4-
MAR 2013

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YX605 전자부품, 판매, 대치품
YX605
NOLSUOYSWNCISHNRPTOUETNPOH-UIGUSHPSETFCEFPOIC-UINEPNVCCOEYNRVTERETRER
V1.0
TYPICAL PERFORMANCE CHARACTERISTICS CONT'D
. -7-
MAR 2013

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관련 데이터시트

부품번호상세설명 및 기능제조사
YX605

LOW INPUT HIGH EFFICIENCY SYNCHRONOUS STEP-UP CONVERTER

Huajing Electronics
Huajing Electronics

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