AX3070
Wide Input Range CC/CV Step Down
Controller
GENERAL DESCRIPTION
The AX3070 is a step down PWM controller with a driving dual output current to 4.8 A
(2.4A+2.4A). It is designed to allow for operating a wide supply voltage range from 9V to 40V.
The external shutdown function can be controlled by logic level to pull COMP/EN pin down,
and then comes into standby mode. The external compensation makes feedback control
have good line and load regulation with flexible external design.
The AX3070 operates in the CC (Constant output Current) mode or CV (Constant
output Voltage) mode, and the OCP current value is set by current sensing resisters.
The AX3070 is suitable for the DC/DC switching power applications when requested
the current limit function. The devices are available in MSOP-10L packages and require very
few external devices for operation.
FEATURES
-
-
-
-
-
-
-
-
-
-
-
-
-
V
IN
Operate with 9V ~ 40V Supply Voltage
V
OUT
Accuracy (V
REF
=1.0V) ±2.0%
Dual-Channeling CC/CV Mode Control
External Current Limit Setting for 2 channel
Over Temperature Protection
Internal Soft Start ~ 3ms
Fixed Frequency 120KHz
UVLO Protection (min=7V, typ=7.5V, max=8V)
Duty Cycle Range (0~90%)
Single Pin to External Compensation and Shutdown Control
C
OUT
MLCC support.
Built in Adjustable Line-Compensation
MSOP-10L Package
APPLICATION
-
-
-
-
Car Charger
High-Brightness Lighting
Portable Charger Devices
General-Purpose DC/DC Controller with Current Limit
1/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev1.5 Nov.24, 2016
AX3070
BLOCK DIAGRAM
Over Temperature
Protection
POR
VIN
Internal
Regulator
5V
FB
0.36V
5V
+
-
-
UVP
Fault
Logics
BS
0.4V
+
UG
VREF
+
ERROR
AMPLIFIER
-
+
Cable
COMP
Gate
Control
LX
COMP
-
ramp
LG
SEN1
0.1V
Current
Sensor1
SEN2
0.1V
Current
Sensor2
Oscillator
120KHz
Zero
Current
Detection
GND
PIN ASSIGNMENT
The package of AX3070 is MSOP-10L the pin assignment is given by:
2/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev1.5 Nov.24, 2016
AX3070
Name
VIN
Description
Power Supply Input. Bypass this pin with a 1uF ceramic capacitor to GND,
placed as close to the IC as possible.
Error Amplifier Output. This is the output of the error amplifier (EA) and the
non-inverting input of the PWM comparator. Use this pin in combination with the
FB pin to compensate the voltage control feedback loop of the converter. Pulling
COMP to a level below 0.4V nominal disables the controller, causes the
oscillator to stop, and makes the UGATE and LGATE outputs held low.
Feedback Pin. The voltage at this pin is regulated to 1.0V. Connect to the
resistor divider between output and GND to set the output voltage.
The Current Sense Input2 (+) Pin. When the SEN2 is larger than the current
sense voltage, OCP function will enable.
The Current Sense Input1 (+) Pin. When the SEN1 is larger than the current
sense voltage, OCP function will enable.
Ground. Connect this pin to a large PCB copper area for best heat dissipation,
Return FB, and COMP to this GND and connect this GND to power GND at a
single point for best noise immunity.
Output to Low-side Gate Driver.
Output to High-side Gate Driver.
Power Switching Output to External Inductor.
Bootstrap Pin. This provides power to the internal higher MOSFET gate driver.
Connect a 100nF capacitor from BS pin to LX pin.
COMP
FB
SEN2
SEN1
GND
LG
UG
LX
BS
ORDER/MARKING INFORMATION
Order Information
Top Marking
3/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev1.5 Nov.24, 2016
AX3070
ABSOLUTE MAXIMUM RATINGS
(at T
A
= 25°C)
Characteristics
Supply Input Voltage
BS to LX
LX to GND
BS, UG to GND
FB, COMP, LG,SEN1, SEN2 to GND
ESD HBM (Human Body Mode)
ESD MM (Machine Mode)
Power Dissipation, PD @T
A
=25°C
Thermal Resistance from Junction to case
Thermal Resistance from Junction to ambient
Symbol
V
IN
V
SW
Rating
-0.3 to +43
-0.3 to +7
-1 to +V
IN
+1
V
SW
-0.3 to V
SW
+7
0.3 to +7
±2K
±200
( T
J
-T
A
) / θ
JA
43
135
Unit
V
V
V
V
V
V
V
mW
°C/W
°C/W
P
D
θ
JC
θ
JA
RECOMMENDED OPERATION CONDITIONS
Characteristics
Storage Temperature Range
Junction Temperature
Operating Temperature
Lead Temperature Range(Soldering 10sec)
Symbol
T
ST
T
J
T
OP
Rating
-65 to +150
-40 to +125
-40 to +85
260
Unit
°C
°C
°C
°C
4/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev1.5 Nov.24, 2016
AX3070
ELECTRICAL CHARACTERISTICS
V
CC
=12V, T
A
=25°C (unless otherwise specified.)
Characteristics
Symbol
Test Conditions
Supply Voltage Range V
IN
V
CC
I
CCQ
COMP/EN=GND
Supply Input Current
I
CC
12Vin V
OUT
=5V,No load
I
CC
30Vin V
OUT
=5V,No load
Power-On-Reset
V
CCRTH
V
CC
Rising.
VCC POR Threshold
V
CCFTH
V
CC
Falling.
Oscillator
Normal PWM Frequency
F
OSC
I
OUT
=200mA
Minimum On-Time
T
ON-MIN
Duty Cycle Range
Duty
Reference
V
REF
Reference Voltage
Reference Voltage Tolerance
Line compensation Current
I
FB
V
SEN1
or V
SEN2
=100mV
PWM Error Amplifier
COMP Shutdown Threshold Voltage
V
COMP
=V
COMP_H
-1V
COMP Source Current
V
COMP
=1V
COMP Sink Current
Current Sense Amplifier
Difference Voltage between SEN-
△V
SEN
and SEN+
Pre-Driver (Ensured
by design)
source
UG Driver
sink
source
LG Driver
sink
UG low to LG high
Dead Time
LG low to UG high
Protection
Over Temperature Shutdown
Over Temperature Hysteresis
Soft Start
T
SS
Soft Start Time
Recycle Time
Output Short Circuit Protect Section
V
SCP
Short Circuit Fold Back Voltage
Min Typ Max
9
- 40
-
2 -
- 7.5 -
- 15 20
7
6
7.5 8
6.5 7
Units
V
mA
mA
mA
V
96 120 144 KHz
- 200 -
Ns
0
- 90
%
-
-2
-
-
-
-
1.0 -
- +2
5 -
0.4 -
132 -
126 -
V
%
uA
V
uA
uA
mV
Ω
Ω
Ω
Ω
nS
nS
°C
°C
ms
s
V
95 100 105
-
-
-
-
-
-
-
-
-
-
-
10
2
13
1.5
40
100
-
-
-
-
-
-
160 -
40 -
3
0.5
0.4
-
-
-
5/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev1.5 Nov.24, 2016
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