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PDF AX3512 Data sheet ( Hoja de datos )
| Número de pieza | AX3512 | |
| Descripción | 600mA Synchronous Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3512
1.4MHz, 600mA Synchronous Step-Down
Converter
GENERAL DESCRIPTION
AX3512 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 5.5V input
voltage range makes AX3512 ideally suited for single Li-Ion, two to three AA
battery-powered applications. 100% duty cycle provides low dropout operation, extending
battery life in portable systems. PWM 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. AX3512 is available in small
TSOT-23-5L and TDFN-6L packages.
FEATURES
- 2.5V to 5.5V Input Voltage Range
- Output Voltage from 0.6V to VIN
- High Efficiency: Up to 95%
- 1.4MHz Constant Frequency Operation
- Up to 600mA 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
- TSOT-23-5L and TDFN-6L Pb-Free packages
1/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Oct.20, 2011
1 page  
AX3512
APPLICATION CIRCUIT
VIN=2.5V~5.5V
C1
4.7uF
U1
VIN SW
EN
GND FB
AX3512
L1
2.7uH
R1
600K
VOUT = 0.6 * (1+R1/R2)
R2=100K~330K
R2
300K
VOUT=1.8V
C3
15pF C2
10uF
FUNCTION DESCRIPTIONS
Operation
AX3512 is a 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
minimum 600mA output current at 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 transient 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.
5/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Oct.20, 2011
5 Page 
AX3512
TYPICAL CHARACTERISTICS (CONTINUES)
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 = 0A 600mA VIN = 3.3V, VOUT = 1.2V, IOUT = 0A 600mA
11/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Oct.20, 2011
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AX3512.PDF ] | |
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