AX3075/B
Wide Input Range CC/CV Step Down
Controller
GENERAL DESCRIPTION
The AX3075/B is a step down PWM controller with a driving dual output current to 3.4A.
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 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 AX3075/B 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 AX3075/B is suitable for the DC/DC switching power applications when requested
the current limit function. The devices are available in TDFN-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/65KHz
UVLO Protection (min=7V, typ=7.5V, max=8V)
Duty Cycle Range
AX3075 (0~93%)
AX3075B (0~97%)
Single Pin to External Compensation and Shutdown Control
C
OUT
MLCC support.
Built in Adjustable Line-Compensation
TDFN-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.
Rev1.2 Apr.22, 2016
AX3075/B
BLOCK DIAGRAM
Over Temperature
Protection
POR
VIN
Internal
Regulator
5V
FB
0.36V
5V
+
-
-
UVP
Fault
Logics
BS
0.4V
+
-
+
Cable
COMP
Gate
Control
UG
VREF
+
ERROR
AMPLIFIER
COMP
LX
-
ramp
LG
SEN1
0.1V
Current
Sensor1
SEN2
0.1V
Current
Sensor2
Oscillator
120KHz/65KHz
Zero
Current
Detection
GND
PIN ASSIGNMENT
The package of AX3075/B is TDFN-10L the pin assignment is given by:
VIN
1
COMP
2
FB
3
SEN2
4
SEN1
5
TDFN-10L (3*3)
TOP View
10
BS
Exposed
Pad
(GND)
LX
8
UG
7
LG
9
6
GND
2/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev1.2 Apr.22, 2016
AX3075/B
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 0 75X
Y Y W WX
Part number
AX3075
AX3075B
ID code: internal
WW: 01~52
Year: 10=2010
11=2011
:
:
19=2019
AX3075 X XXX X
Blank:120KHz Package Type Packing
B:65KHz J10: TDFN-10L Blank : Tube
A : Taping
3/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev1.2 Apr.22, 2016
AX3075/B
ABSOLUTE MAXIMUM RATINGS
(at T
A
= 25°C)
Characteristics
Symbol
Supply Input Voltage
V
IN
BS to LX
LX to GND
V
SW
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
P
D
Thermal Resistance from Junction to case
θ
JC
Thermal Resistance from Junction to ambient
θ
JA
RECOMMENDED OPERATION CONDITIONS
Characteristics
Symbol
Storage Temperature Range
T
ST
Junction Temperature
T
J
Operating Temperature
T
OP
Temperature Range(Soldering 10sec)
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
7.8
68
Unit
V
V
V
V
V
V
V
mW
°C/W
°C/W
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.
Rev1.2 Apr.22, 2016
AX3075/B
ELECTRICAL CHARACTERISTICS
V
CC
=12V, T
A
=25°C (unless otherwise specified.)
Characteristics
Symbol
Test Conditions
Min Typ Max Units
Supply Voltage Range V
IN
V
CC
9
- 40
V
I
CCQ
COMP/EN=GND
-
2
-
mA
I
CC
12V
IN
V
OUT
=5V,No load
- 3.5 -
mA
AX3075
Supply Input Current
I
CC
30V
IN
V
OUT
=5V,No load
-
4
-
mA
I
CC
12V
IN
V
OUT
=5V,No load
- 4.5 -
mA
AX3075B
I
CC
30V
IN
V
OUT
=5V,No load
-
5
-
mA
Power-On-Reset
V
CCRTH
V
CC
Rising.
7 7.5 8
VCC POR Threshold
V
V
CCFTH
V
CC
Falling.
- 6.5 -
Oscillator
AX3075
96 120 144 KHz
Normal PWM Frequency
F
OSC
I
OUT
=200mA
AX3075B
50 65 80 KHz
Minimum On-Time
T
ON-MIN
- 200 -
nS
AX3075
0
- 93
%
Duty Cycle Range
Duty
AX3075B
0
- 97
%
Reference
V
REF
- 1.0 -
V
Reference Voltage
-2
- +2
%
Reference Voltage Tolerance
Line compensation Current
I
FB
V
SEN1
or V
SEN2
=100mV
-
5
-
uA
PWM Error Amplifier
- 0.4 -
V
COMP Shutdown Threshold Voltage
V
COMP
=V
COMP_H
-1V
- 132 -
uA
COMP Source Current
V
COMP
=1V
- 126 -
uA
COMP Sink Current
Current Sense Amplifier
Difference Voltage between SEN-
△V
SEN
95 100 105 mV
and SEN+
Pre-Driver (Ensured
by design)
source
- 12 -
Ω
UG Driver
sink
-
3
-
Ω
source
- 15 -
Ω
LG Driver
sink
-
2
-
Ω
UG low to LG high
- 40 -
nS
Dead Time
LG low to UG high
- 100 -
nS
Protection
- 160 -
°C
Over Temperature Shutdown
- 40 -
°C
Over Temperature Hysteresis
Soft Start
T
SS
-
3
-
ms
Soft Start Time
- 0.5 -
s
Recycle Time
Output Short Circuit Protect Section
V
SCP
- 0.4 -
V
Short Circuit Fold Back Voltage
5/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev1.2 Apr.22, 2016
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