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부품번호 | AX3513 기능 |
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기능 | 1A Synchronous Step-Down Converter | ||
제조업체 | AXElite | ||
로고 | |||
AX3513
1.4MHz, 1A Synchronous Step-Down
Converter
GENERAL DESCRIPTION
AX3513 is a high efficiency monolithic synchronous buck regulator using a constant
frequency, current mode architecture. The device is available in an adjustable version.
Supply current with no load is 250uA and drops to <1uA in shutdown. The 2.5V to 6V input
voltage range makes AX3513 ideally suited for single Li-Ion, two to four AA battery-powered
applications. 100% duty cycle provides low dropout operation, extending battery life in
portable systems. PWM pulse skipping mode operation provides very low output ripple
voltage for noise sensitive applications. Switching frequency is internally set at 1.4MHz,
allowing the use of small surface mount inductors and capacitors. The internal synchronous
switch increases efficiency and decreases need of an external schottky diode. Low output
voltages are easily supported with the 0.6V feedback reference voltage. AX3513 is available
in small TSOT23-5L and TDFN-6L packages.
FEATURES
- 2.5V to 6V Input Voltage Range
- Output Voltage from 0.6V to VIN
- High Efficiency: Up to 96%
- 1.4MHz Constant Frequency Operation
- Up to 1A Output Current
- Quiescent Current: 250uA (Typical)
- No Schottky Diode Required
- Current Mode Operation for Excellent Line and Load Transient Response
- Current limit, Enable function
- Short Circuit Protect (SCP)
- Build in soft start function
- ≤ 1µA Shutdown Current
- TSOT23-5L and TDFN-6L Pb-Free packages
1/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jun.25, 2010
Free Datasheet http://www.datasheet4u.com/
AX3513
ELECTRICAL CHARACTERISTICS
(VIN = VEN=3.6V, TA =25°C, unless otherwise specified)
Characteristics
Symbol
Conditions
Min Typ Max Units
Input Voltage Range
VIN
2.5 -
6V
Feedback Voltage
VFB TA = +25°C
0.588 0.600 0.612
V
-40°C≤TA≤ 85°C 0.582 0.600 0.618
Feedback Bias Current
Quiescent Current
IFB VFB=0.65V
ICCQ VFB=1V
- - ±30 nA
- 250 350 uA
Shutdown Supply Current
ISD VEN =0V
- 0.1 1 uA
Switching Current Limit
Line Regulation
Load Regulation
ILIMIT
△VOUT/VOUT VIN = 2.5V to 5.5V
△VOUT/VOUT IOUT = 0.01 to 1A
1.2 1.4 - A
- 0.04 0.4 %/V
- 0.5 - %
Oscillation Frequency
RDS(ON) of P-CH MOSFET
RDS(ON) of N-CH MOSFET
EN pin logic input threshold
voltage
FOSC
RDSON
RDSON
VENL
VENH
SW pin
1.1
VFB = 0V, IOUT = 0.5A -
(Note 1)
-
-
1.5
1.4 1.7 MHz
0.3 0.4 Ω
0.25 0.35 Ω
- 0.4
V
--
EN Pin Input Current
Efficiency
Thermal shutdown
Thermal
shutdown Hysteresis
Note 1: Guaranteed by design.
IEN - ±0.1 ±1 uA
EFFI
VIN=5V, VOUT=3.3V,
IOUT=0.5A
-
94
-
%
TDS - 140 - °C
TSH - 30 - °C
4/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jun.25, 2010
Free Datasheet http://www.datasheet4u.com/
4페이지 AX3513
For output voltages above 2.0V, when light-load efficiency is important, the minimum
recommended inductor is 2.7µH. For optimum voltage-positioning load transients, choose
an inductor with DC series resistance in the 50mΩ to 150mΩ range. For higher efficiency at
heavy loads (above 200mA), or minimal load regulation (but some transient overshoot), the
resistance should be kept below 100mΩ. The DC current rating of the inductor should be at
least equal to the maximum load current plus half the ripple current to prevent core
saturation (1000mA+100mA).
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching
noise from the device. The input capacitor impedance at the switching frequency shall be
less than input source impedance to prevent high frequency switching current passing to the
input. A low ESR input capacitor sized for maximum RMS current must be used. Ceramic
capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR
and small temperature coefficients. A 4.7µF ceramic capacitor for most applications is
sufficient.
Output Capacitor Selection
The output capacitor is required to be 10uF to keep the output voltage ripple small and
to ensure regulation loop stability. The output capacitor must have low impedance at the
switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due
to their low ESR and high ripple current.
Compensation Capacitor Selection
The compensation capacitors for increasing phase margin provide additional stability. It
is required 15pF, Please refer to Demo Board Schematic to design.
7/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jun.25, 2010
Free Datasheet http://www.datasheet4u.com/
7페이지 | |||
구 성 | 총 13 페이지수 | ||
다운로드 | [ AX3513.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |