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AX1509
150KHz, 2A PWM Buck DC/DC Converter
Description
The AX1509 is Monolithic IC that design for a step-down DC/DC Converter, and own the
ability of driving a 2A load without additional transistor component. The output version
included 3.3V, 5V, 12V and an adjustable type. It operates at a switching frequency of
150KHz thus allowing smaller sized filter components than what would be needed with lower
frequency switching regulators. Other features include a guaranteed ±4% tolerance on
output voltage under specified input voltage and output load conditions, and ±15% on the
oscillator frequency. Regarding protected function, thermal shutdown is to prevent over
temperature operating from damage, and current limit is against over current operating of
the output switch.
Features
• 3.3V, 5V, 12V and adjustable
• Adjustable version output voltage range: 1.25-18V
• ±4% max over line and load conditions
• 150KHz ±15% fixed switching frequency
• TTL shutdown capability
• Operating voltage can be up to 22V
• Output load current: 2A
• SOP-8 and DIP-8 packages
• Low power standby mode
• Thermal-shuntdown and current-limit protection
• High efficiency
• Built-in switching a transistor on chip, requires only 4 external components
Applications
• Simple High-efficiency step-down regulator
• Positive to negative converter
• On-card switching regulators
Pin Connections
87 65
12 34
Pin1: Operating Voltage Input
Pin2: Switch Output
Pin3: Output Voltage Feedback Control
Pin4: ON/OFF Shutdown
Pin5: Ground
Pin6: Ground
Pin7: Ground
Pin8: Ground
Page No. : 1/8
8-Lead Plastic DIP-8
Package Code: P
•
8-Lead Plastic SOP-8
Package Code: S
DS-AX1509-01 Aug, 2006
www.Orister.com
Pin Connections
Current
Source
Bias
11.2253V5V
Reference
FB
+
R2
AMP
-
R1=2.5K
+
COMP
-
SD
2.5V
Regulator
Start
Up
++
200mV 220mV
-
COMP
+
150KHz
OSC.
+
COMP
Current
Limit
-
-
COMP
+
Driver
Thermal
Limit
Page No. : 2/8
VIN
R
3A
Switch
Output
GND
Absolute Maxium Rating (Note1)
Parameter
Supply Voltage
On/Off Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
Operating Temperature
Storage Temperature
Operating Voltage
Symbol
VCC
VSD
VFB
VOUT
PD
Topr
Tstg
VOP
Value
+24
-0.3~+18
-0.3~+18
-1
Internally Limited
-40~+125
-65~+150
+4.5~+22
Unit
V
V
V
V
W
oC
oC
V
Electrical Characteristics (Continued)
Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25oC(Note 2)
Part No.
Parameter
Symbol
Conditions
Min.
Typ. Max.
(Note3) (Note4)
AX1509-3.3
AX1509-5.0
AX1509-12
AX1509-ADJ
Output Voltage
Efficiency
Output Voltage
Efficiency
Output Voltage
Efficiency
Output Voltage
Efficiency
VOUT
η
VOUT
η
VOUT
η
VOUT
η
4.75V≤VIN≤22V, 0.2A≤ILOAD≤2A
VIN=12V, ILOAD=2A
7V≤VIN≤22V, 0.2A≤ILOAD≤2A
VIN=12V, ILOAD=2A
15V≤VIN≤22V, 0.2A≤ILOAD≤2A
VIN=25V, ILOAD=2A
4.5V≤VIN≤22V, 0.2A≤ILOAD≤2A
VOUT programmed for 3V
VIN=12V, VOUT=3V, ILOAD=2A
3.168
3.135
3.3
3.342
3.465
- 73 -
4.800
4.750
5.0
5.200
5.250
- 80 -
11.52
11.40
12.0
12.48
12.60
- 90 -
1.213
1.200
1.25
1.287
1.300
- 73 -
Unit
V
%
V
%
V
%
V
%
DS-AX1509-01 Aug, 2006
www.Orister.com
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