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PDF AX3516 Data sheet ( Hoja de datos )
| Número de pieza | AX3516 | |
| Descripción | 2.5A Synchronous Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3516 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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AX3516
1.2MHz, 2.5A Synchronous Step-Down
Converter
GENERAL DESCRIPTION
The AX3516 is a 1.2MHz constant frequency current mode PWM step-down converter.
It is ideal for portable equipment requiring very high current up to 2.5A from single-cell
Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions.
The AX3516 also can run at 100% duty cycle for low dropout operation, extending battery
life in portable systems while light load operation provides very low output ripple for noise
sensitive applications. The AX3516 can supply up to 2.5A output current from a 2.6V to 4V
input voltage and up to 3A output current from a 4V to 5.5V input voltage. The output voltage
can be regulated as low as 0.8V. The high switching frequency minimizes the size of
external components while keeping switching losses low. The internal slope compensation
setting allows the device to operate with smaller inductor values to optimize size and provide
efficient operation. The AX3516 is available in adjustable (0.8V to VIN) output voltage. The
device is available in SOP-8L-EP, TDFN-8L and TDFN-10L Pb-free packages.
FEATURES
- 2.6V to 5.5V Input Voltage Range
- Output Voltages from 0.6V to VIN
- High Efficiency: Up to 94%
- 1.2MHz Constant Frequency Operation
- Output Current:
Up to 2.5A Output Current for VIN=2.6V~4V
Up to 3A Output Current for VIN=4V~5.5V
- 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
- SOP-8L-EP, TDFN-8L and TDFN-10L Pb-Free packages
1/13
AXElite Confidential Materials, do not copy or distribute without written consent .
Rev.1.7 Jun.28, 2010
1 page  
AX3516
APPLICATION CIRCUIT
VIN=2.6 to 5.5V
R1
C1
22uF
10R
C3
100nF
U1
PVIN
SVIN
EN
LX
FB
PGND SGND
AX3516
VOUT = 0.6 * (1+R2/R3)
R2=470K~750K
L1
3.3uH
R2
600K
R3
300K
VOUT=1.8V
C5
15pF C2
22uF
FUNCTION DESCRIPTIONS
Operation
AX3516 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
2500mA output current at input voltage range from 2.6V 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, as indicated by the
current reversal comparator, IZERO, or the beginning of the next clock cycle.
5/13
AXElite Confidential Materials, do not copy or distribute without written consent .
Rev.1.7 Jun.28, 2010
5 Page 
PACKAGE OUTLINES
(1) SOP-8L-EP
AX3516
Symbol
Dimensions in Millimeters
Min. Nom. Max.
A - - 1.75
A1 0
- 0.15
A2 1.25
-
-
C 0.1 0.2 0.25
D 4.7 4.9 5.1
E 3.7 3.9 4.1
H 5.8 6 6.2
L 0.4 - 1.27
b 0.31 0.41 0.51
e 1.27 BSC
y - - 0.1
X - 2.34 -
Y - 2.34 -
θ 0O - 8O
Mold flash shall not exceed 0.25mm per side
JEDEC outline: MS-012 BA
Dimensions in Inches
Min. Nom. Max.
- - 0.069
0 - 0.06
0.049
-
-
0.0075 0.008
0.01
0.185 0.193
0.2
0.146 0.154 0.161
0.228 0.236 0.244
0.015
-
0.05
0.012 0.016
0.02
0.050 BSC
- - 0.004
- 0.092 -
- 0.092 -
0O - 8O
11/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.7 Jun.28, 2010
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AX3516.PDF ] | |
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