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PDF AX3771 Data sheet ( Hoja de datos )
| Número de pieza | AX3771 | |
| Descripción | Dual High-Efficiency PWM Step-Down DC-DC Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3771 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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AX3771 (Preliminary)
Dual High-Efficiency PWM Step-Down
DC-DC Converter
GENERAL DESCRIPTION
The AX3771 is a dual high-efficiency Pulse-Skipping-Modulated (PSM) step-down
DC-DC converter. It is capable of delivering 1A output current over a wide input voltage
range from 2.5V to 7.5V, the AX3771 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: PSM/Low-Dropout auto-switch and shutdown
modes. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction
loss at PSM mode. No external Schottky diode is required in practical application.
The AX3771 enters Low-Dropout mode when normal PSM cannot provide regulated
output voltage by continuously turning on the upper PMOS. The AX3771 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-12L (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 7.5V Input Voltage Range
- Adjustable Output Voltage from 0.6V to VIN
- 1.4MHz Constant Frequency Operation
- 1.2A Output Current/per channel
- High Efficiency : up to 95%
- No Schottky Diode Required
- 100% Duty Cycle in Dropout
- Current Mode Operation for Excellent Line and Load Transient Response
- Current limit, Enable function
- Short Circuit Protect (SCP)
- Small 12-Lead TDFN Package
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.0.2 May.13, 2014
1 page  
AX3771 (Preliminary)
APPLICATION CIRCUIT
Adjustable Voltage Regulator
VIN=2.6V~7.5V
C1
4.7µ F
ON OFF
R1
100K
VOUT1=3.3V
L1 2.2µH
C4 330pF
VIN1 NC1 VIN21
EN1 EN2
LX1 LX2
C5
R4 4.7µF
100K
ON OFF
L2 2.2µH
C8 330pF
VOUT2=1.2V
C2
10µ F
R2 540K
FB1
R3
120K
FB2
R6
100K
R5 100K
C6
10µ F
VOUT1
=
VFB1
× (1+
R2
R3
),VOUT
2
=
VFB2
× (1+
R5
R6
)
R3,R6 : Rang = 50K ~ 330K
FUNCTION DESCRIPTIONS
Operation
AX3771 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 1.2A output current by each channel with input voltage range from 2.5V to 7.5V.
Current Mode PSM Control
Slope compensated current mode PSM 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.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.0.2 May.13, 2014
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX3771.PDF ] | |
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