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PDF AX3514B Data sheet ( Hoja de datos )
| Número de pieza | AX3514B | |
| Descripción | 2A Synchronous Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3514/A/B
1.2MHz, 2A Synchronous Step-Down
Converter
GENERAL DESCRIPTION
The AX3514/A/B is a 1.2MHz constant frequency current mode PWM step-down
converter. It is ideal for portable equipment requiring very high current up to 2A from
single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load
conditions. The AX3514/A/B 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 AX3514/A/B can supply up to 2A output load
current from a 2.6V to 5.5V input voltage and the output voltage can be regulated as low as
0.6V. 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
AX3514/A/B is available in adjustable (0.6V to VIN) output voltage. The device is available in
SOP-8L Pb-free and TDFN-10L packages.
FEATURES
- 2.6V to 5.5V Input Voltage Range
- Output Voltages from 0.6V to VIN
- High Efficiency: Up to 96%
- 1.2MHz Constant Frequency Operation
- Up to 2A Output Current
- No Schottky Diode Required
- Low RDS(ON) Internal Switches: 0.15Ω
- 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 Pb-Free and TDFN-10L packages
1/12
AXElite Confidential Materials, do not copy or distribute without written consent .
Rev.1.8 Nov.09, 2011
1 page  
AX3514/A/B
APPLICATION CIRCUIT
VIN=2.6 to 5.5V
C1
22uF
R1
10R
C3
100nF
U1
PVIN
SVIN
EN
LX
FB
PGND SGND
AX3514
L1
3.3uH
R2
600K
R3
300K
VOUT = 0.6 * (1+R2/R3)
R2=510K~820K
VOUT=1.8V
C5
15pF
C2
22uF
FUNCTION DESCRIPTIONS
Operation
AX3514/A/B 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
2000mA 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.
5/12
AXElite Confidential Materials, do not copy or distribute without written consent .
Rev.1.8 Nov.09, 2011
5 Page 
PACKAGE OUTLINES
(1) SOP-8L
AX3514/A/B
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
11/12
AXElite Confidential Materials, do not copy or distribute without written consent .
Rev.1.8 Nov.09, 2011
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX3514B.PDF ] | |
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