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PDF AX3515A Data sheet ( Hoja de datos )
| Número de pieza | AX3515A | |
| Descripción | Dual High-Efficiency PWM Step-Down DC-DC Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3515A
Dual High-Efficiency PWM Step-Down
DC-DC Converter
GENERAL DESCRIPTION
The AX3515A is a dual high-efficiency Pulse-Width-Modulated (PWM) step-down
DC-DC converter. It is capable of delivering 1A output current over a wide input voltage
range from 2.5V to 5.5V, the AX3515A is ideally suited for portable electronic devices that
are powered from 1-cell Li-ion battery or from other power sources within the range such as
cellular phones, PDAs and other handheld devices.
Two operational modes are available: PWM/Low-Dropout auto-switch and shutdown
modes. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction
loss at PWM mode. No external Schottky diode is required in practical application.
The AX3515A enters Low-Dropout mode when normal PWM cannot provide regulated
output voltage by continuously turning on the upper PMOS. The AX3515A enter shutdown
mode and consumes less than 0.1μA when EN pin is pulled low.
The switching ripple is easily smoothed-out by small package filtering elements due to
a fixed operation frequency of 1.4MHz. This along with small TDFN-10L (3x3) package
provides small PCB area application. Other features include soft start, lower internal
reference voltage with 2% accuracy, over temperature protection, and over current
protection.
FEATURES
- 2.5V to 5.5V Input Voltage Range
- Adjustable Output Voltage from 0.6V to VIN
- 1A Output Current/per channel
- High Efficiency : up to 95%
- No Schottky Diode Required
- 1.4MHz Fixed-Frequency PWM Operation
- Small 10-Lead TDFN Package
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.20, 2011
1 page  
AX3515A
APPLICATION CIRCUIT
Adjustable Voltage Regulator
VIN=2.6V~5.5V
OFF ON
VOUT1=3.3V
C5
10uF
C2
4.7uF
R5
100K U1
1 EN1
2.2uH
10 SW1
C3 15pF
R1 540K
2 FB1
R2
120K
EN2 6
AX3515A SW2 5
FB2 7
R6
100K
C1
4.7uF
ON OFF
2.2uH
C4 15pF
R3 100K
R4
100K
VOUT2=1.2V
C6
10uF
VOUT1
=
VFB1
× (1+
R1
R2
),VOUT
2
=
VFB2
× (1+
R3
R4
)
R2,R4 : Rang = 50k ~ 330k
FUNCTION DESCRIPTIONS
Operation
AX3515A is a dual channel, monolithic 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. This Step-Down DC-DC Converter
supplies 1A output current by each channel with input voltage range from 2.5V to 5.5V.
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, beginning of the
next clock cycle.
5/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.20, 2011
5 Page 
AX3515A
TYPICAL CHARACTERISTICS (COUNTINOUS)
VIN = 5V, VOUT = 1.2V, RLOAD = No Load
VIN = 5V, VOUT = 1.2V, RLOAD = 1Ω
VIN = 5V, VOUT = 1.2V, RLOAD = No Load
VIN = 5V, VOUT = 1.2V
VIN = 5V, VOUT = 1.2V, IOUT = 0.2A 1A
VIN = 3.3V, VOUT = 1.2V, IOUT = 0.2A 1A
11/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.20, 2011
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX3515A.PDF ] | |
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