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PDF AX3522 Data sheet ( Hoja de datos )
| Número de pieza | AX3522 | |
| Descripción | 3A Synchronous Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3522
1MHz, 3A Synchronous Step-Down Converter
GENERAL DESCRIPTION
The AX3522 is a 1MHz constant frequency current mode PWM step-down converter. It
is ideal for portable equipment requiring very high current up to 3A from single-cell
Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions.
The AX3522 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 AX3522 can supply up to 3A output load current from a 2.8V to
5.5V input voltage and 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 AX3522 is
available in adjustable (0.8V to VIN) output voltage. The device is available in SOP-8L-EP
and TDFN-8L Pb-free packages.
FEATURES
- 2.8V to 5.5V Input Voltage Range
- Output Voltages from 0.8V to VIN
- High Efficiency: Up to 94%
- 1MHz Constant Frequency Operation
- With power saving mode
- Up to 3A Output Current
- No Schottky Diode Required
- Current Mode Operation for Excellent Line and Load Transient Response
- Current limit and thermal shutdown protection
- Short Circuit Protect (SCP)
- Build-in Soft Start function
- SOP-8L-EP and TDFN-8 Pb-Free packages
1/12
AXElite Confidential Materials, do not copy or distribute without written consent .
Rev.1.1 Oct.07, 2010
1 page  
AX3522
APPLICATION CIRCUIT
VIN=2.8 to 5.5V
C1
22uF
R1
10R
C3
100nF
PVIN
SVIN
EN
LX
FB
SGND
PGND
AX3522
L1
2.2uH
R2
300K
R3
600K
VOUT=1.2V
C5
15pF C2
22uF
VOUT = 0.8 * (1+R2/R3)
R2 = 300K~820K
FUNCTION DESCRIPTIONS
Operation
AX3522 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 0.8V. It operates at a fixed switching frequency, and uses the slope
compensated current mode architecture. This Step-Down DC-DC Converter supplies
3000mA output current at input voltage range from 2.8V 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.1.1 Oct.07, 2010
5 Page 
PACKAGE OUTLINES
(1) SOP-8L-EP
X
AX3522
Expose Pad
b
D
7 (4X)
L
DETAIL A
θ
e
y
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
DETAIL A
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.1.1 Oct.07, 2010
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX3522.PDF ] | |
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