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AX3811A Datasheet Preview

AX3811A Datasheet

Synchronous Step-Down Regulator

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AX3811A
High Efficiency Fast Response, 2A, 18V Input
Synchronous Step-Down Regulator
GENERAL DESCRIPTION
AX3811A develops high efficiency synchronous stepdown DC-DC converter capable of
delivering 2A load current. AX3811A operates over a wide input voltage range from 4.35V to
18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the
conduction loss.
AX3811A adopts the instant PWM architecture to achieve fast transient responses for
high step down applications and high efficiency at light loads. In addition, it operates at
pseudo-constant frequency of 500 kHz under heavy load conditions to minimize the size of
inductor and capacitor.
FEATURES
- Low RDS(ON) for internal switches (top/bottom):140/130 mΩ
- 4.35-18V input voltage range
- 2A load current capability
- Instant PWM architecture to achieve fast transient responses Internal softstart limits the
inrush current
- 2% 0.6V reference
- RoHS Compliant and Halogen Free
- Compact package: SOT23-6
Applications
- Set Top Box
- Portable TV
- Access Point Router
- DSL Modem
- LCD TV
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Nov.04, 2013




AXElite

AX3811A Datasheet Preview

AX3811A Datasheet

Synchronous Step-Down Regulator

No Preview Available !

AX3811A
PIN ASSIGNMENT
The package of AX3811A is SOT-23-6L; the pin assignment is given by:
(Top View)
BS 1
6 LX
GND 2
5 IN
FB 3
4 EN
SOT-23-6L
Name
Description
Boot-Strap pin. Supply high side gate
BS driver. Decouple this pin to LX pin with
0.1uF ceramic cap.
GND Ground pin
Output feedback pin. Connect this pin to
FB
the center point of the output resistor
divider (as shown in Figure 1) to program
the output voltage: Vout=0.6*(1+R1/R2)
EN
Enable control. Pull high to turn on. Do
not float.
IN
Input pin. Decouple this pin to GND pin
with at least 10uF ceramic cap
LX
Inductor pin. Connect this pin to the
switching node of inductor
ORDER/MARKING INFORMATION
Order Information
AX3811A X X
Package Type Packing
C: SOT-23-6L Blank: Tube
A : Taping
Top Marking
NBX Y Z
Lot Number Code
Week Code
Year Code
AX3811A
ABSOLUTE MAXIMUM RATINGS
Characteristics
Supply Input Voltage
LX, EN Voltage
FB, BS-LX Voltage
Power Dissipation (@ TA = 25°C)
Package Thermal Resistance (Note 2)
Junction Temperature Range
Lead Temperature (Soldering, 10 sec.)
Storage Temperature Range
Recommended Operating Conditions (Note 3)
Supply Input Voltage
Junction Temperature Range
Ambient Temperature Range
Symbol
PD
θJC
θJA
TJ
Rating
19
VIN+0.3V
4
0.6
75
170
150
260
65 to 150
4.35 to 18
-40 to 125
-40 to 85
Unit
V
V
V
W
°C/W
°C/W
°C/W
°C
°C
V
°C
°C
2/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Nov.04, 2013


Part Number AX3811A
Description Synchronous Step-Down Regulator
Maker AXElite
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