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AT7109 데이터시트 PDF




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부품번호 AT7109 기능
기능 800mA Synchronous Step-Down Converter
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AT7109 데이터시트, 핀배열, 회로
AT7109
Dual 1.5MHz, 800mA Synchronous Step-Down Converter
FEATURES
z High Efficiency: Up to 93%
z 800mA Output Current
z 2.5V to 5.5V Input Voltage Range
z 1.5MHz Constant Frequency Operation
z No Schottky Diode Required
z Low Dropout Operation: 100% Duty Cycle
z 0.6V Reference Allows Low Output Voltages
z Shutdown Mode Draws 1uA Supply Current
z Current Mode Operation for Excellent Line and
Load Transient Response
z Thermal Fault Protection
z Short Circuit Protection
APPLICATION
z Cellular Telephones
z Wireless and DSL Modems
z Digital Still Cameras
z Mp3 Players
z Portable Instruments
z Microprocessors and DSP Core Supplies
Immense Advance Tech.
DESCRIPTION
The AT7109 is a dual channel, constant frequency,
synchronous step-down DC/DC converter. Intended
for low power applications, it operates from 2.5V to
5.0V input voltage range and has a constant
1.5MHz switching frequency, enabling the use of
tiny, low cost capacitors and inductors 1mm or less
in height. Each output voltage is adjustable from
0.6V to 4.2V. Internal synchronous 0.35, 1A power
switches provide high efficiency without the need for
external Schottky diodes.
The current mode operation achieves fast line and
load transient response. To maximize battery life,
the p-channel MOSFETs are turned on continuously
in dropout (100% duty cycle), and both channels
draw a total quiescent current of only 250μA for
each output. In shutdown, the device draws <1μA.
ORDER INFORMATION
AT 7109- A DCS10 R
IAT
Circuit Type
Shipping:
R: Tape & Reel
Output Voltage:
A: ADJ
DCS10: TDFN 3x3-10L
PIN CONFIGURATIONS (TOP VIEW)
Ver.1.02
1




AT7109 pdf, 반도체, 판매, 대치품
AT7109
Dual 1.5MHz, 800mA Synchronous Step-Down Converter
ELECTRICAL CHARACTERISTICS
Immense Advance Tech.
Specifications with standard type face are for TA= 25°C, and those with boldface type apply over Full Operating Temperature Range.
VIN=3.6V, L=2.2μH, COUT=10μF unless otherwise specified.
Parameter
Symbol
Condition
Min Typ Max Unit
Input Voltage Range
Quiescent Current
VIN
IQ
IOUT= 0mA, VFB= VREF + 5%
(Note3)
2.5 5.5 V
250 μA
Shutdown Current
Regulated Feedback
Voltage
ISHDN
VFB
EN= GND
TA= +25°C
0.1 1 μA
0.5880 0.6000 0.6120 V
VFB Input Bias Current
Reference Voltage
Line Regulation(Adj)
IFB VFB =0.65V
REGLINE VIN=2.5V to 5.5V, VOUT= VFB
±30 nA
0.11 0.4 %/V
Reference Voltage
Load Regulation(Adj)
REGLOAD
0.5 %
Peak Inductor Current
IPK
VIN=3V, VFB=0.5V or VOUT=90%
Duty cycle<35%
1.3
A
Oscillator Frequency
RDS(ON) of P-CH
MOSFET
FOSC
RPFET
VFB=0.6V or VOUT=100%
ISW=300mA
1.2 1.5 1.8 MHz
0.4 0.5
RDS(ON ) of N-CH
MOSFET
RNFET ISW=-300mA
0.35 0.45
SW Leakage
ILSW VEN=0V, VSW=0V or 5V, VIN=5V
EN Threshold
VEN -40°C TA 85°C
EN Leakage Current
IEN
Note 3: SW pin open, supply current is measured without switching loss.
±0.01 ±1
0.3 1.0 1.5
±0.01 ±1
μA
V
μA
Ver.1.02
4

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AT7109 전자부품, 판매, 대치품
AT7109
Dual 1.5MHz, 800mA Synchronous Step-Down Converter
APPLICATION INFORMATION
Immense Advance Tech.
Operation
The AT7109 is a dual channel switching mode
Step-Down DC-DC converter. It utilizes internal
MOSFETs to achieve high efficiency and can
generate very low output voltage by using internal
reference at 0.6V. It operates at a fixed switching
frequency, and uses the slope compensated current
mode architecture.
Current Mode PWM Control
Slope compensated current mode PWM control
provides stable switching and cycle-by-cycle current
limit for excellent load and line responses and
protection of the internal main switch (P-Ch
MOSFET) and synchronous rectifier (N-Ch
MOSFET). During normal operation, the internal
P-Ch MOSFET is turned on for a certain time to
ramp the inductor current at each rising edge of the
internal oscillator, and switched off when the peak
inductor current is above the error voltage. The
current comparator, ICOMP, limits the peak inductor
current. When the main switch is off, the
synchronous rectifier will be turned on immediately
and stay on until either the inductor current starts to
reverse. The OVDET comparator controls output
transient overshoots by turning the main switch off
and keeping it off until the fault is no longer present.
At low input supply voltage, the RDS(ON) of the P-Ch
MOSFET increases, and the efficiency of the
converter decreases. Caution must be exercised to
ensure the heat dissipated not to exceed the
maximum junction temperature of the IC.
Note 3. The duty cycle D of a step-down converter is defined as:
D
=
TON
× fOSC
× 100%
VOUT
VIN
× 100%
Where TON is the main switch on time, and fOSC is the oscillator
frequency (1.5Mhz).
Maximum Load Current
The AT7109 will operate with input supply voltage as
low as 2.5V, however, the maximum load current de-
creases at lower input due to large IR drop on the
main switch and synchronous rectifier. The slope
compensation signal reduces the peak inductor
current as a function of the duty cycle to prevent
sub-harmonic oscillations at duty cycles greater
than 50%. Conversely the current limit increases as
the duty cycle decreases.
Short-Circuit Protection
A current limit (1.3A) circuit is equipped in the
AT7109, to protect the AT7109 when the output pin
is shorted to GND pin. This current limit will
suppress the output current so that the inductor
current has enough time to decay.
Dropout Operation
When the input voltage decreases toward the value
of the output voltage, the AT7109 allows the main
switch to remain on for more than one switching
cycle and increases the duty cycle until it reaches
100%. The output voltage then is the input voltage
minus the voltage drop across the main switch and
the inductor.
Ver.1.02
Setting the Output Voltage
Figure 2 above shows the basic application circuit
with AT7109 adjustable output version. R2 should
be smaller than 100kfor reasons of stability. The
external resistor sets the output voltage according to
the following equation:
7

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부품번호상세설명 및 기능제조사
AT7109

800mA Synchronous Step-Down Converter

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