Description
The AP1509 ries are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 2A load without additional transistor. It saves board space. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having good line and load regulation without external design. 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. If current limit function occurs and V FB is down below 0.5V, the switching frequency will be reduced. The AP1509 ries operates at a switching frequency of 150KHz thus allow 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. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The chips are available in a standard 8-lead SOP-8 package. Pin Assignments
(Top View)
V IN
GND FB
GND Output
GND
GND SD
SOP-8L
Features
• Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version
• Adjustable Version Output Voltage Range, 1.23V to 18V+4%
• 150KHz +15% Fixed Switching Frequency
• Voltage Mode Non-Synchronous PWM Control
• Thermal-Shutdown and Current-Limit Protection
• ON/OFF Shutdown Control Input
• Operating Voltage can be up to 22V
• Output Load Current: 2A
• SOP-8L Packages
• Low Power Standby Mode
• Built-in Switching Transistor On Chip
• SOP-8L: Available in “Green” Molding Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1) Applications鲫鱼豆腐汤怎么做好吃
• Simple High-Efficiency Step-Down Regulator • On-Card Switching Regulators
• Positive to Negative Converter
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Plea visit our website at /products/lead_free.html.
Typical Application Circuit
(1) Fixed Type Circuit
(2) Adjustable Type Circuit
V OUT = V FB ×(1 +
R2
R1
)
V FB = 1.23V R2 = 1K ~ 3K
(3) Delay Start Circuit
Pin Descriptions
Functional Block Diagram
GND
Output V IN
SD
FB
Pin Name
Description
V IN
Operating voltage input
Output Switching output GND Ground FB Output voltage feedback control SD
ON/OFF Shutdown
Absolute Maximum Ratings
Symbol Parameter Rating Unit
ESD HBM Human Body Model ESD Protection 2 KV
ESD MM Machine Model ESD Protection 200 V V IN Supply
Voltage +24 V V SD ON/OFF Pin Input Voltage -0.3 to +18 V
V FB Feedback Pin Voltage -0.3 to +18 V
V OUT Output Voltage to Ground -1 V
P D Power Dissipation Internally Limited W
T ST Storage Temperature -65 to +150 o C
T J Operating Junction Temperature -40 to +125 o C Recommended Operating Conditions
Symbol Parameter Min Max Unit
I OUT Output
Current 0 2 A
Voltage 4.5 22 V V OP Operating
T A Operating Ambient Temperature -20 85 o C
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Electrical Characteristics
Unless otherwi specified, V IN = 12V for 3.3V, 5V, adjustable version and V IN = 18V for the 12V version. I LOAD = 0.5A Specifications with boldface type are for full operating temperature range, the other type are for T J = 25ºC.
离别时的祝福语Symbol Parameter Conditions Min Typ. Max Unit
I FB Feedback Bias Current V FB = 1.3V
(Adjustable version only)
-10
-50
nA
-100
F OSC Oscillator
劳动纪律Frequency 127 150 173
KHz 110 173
F SCP Oscillator Frequency of
Short Circuit Protect
When current limit occurred
and V FB < 0.5V, T a = 25 o C
10 30 50 KHz
V SAT Saturation
Voltage I OUT = 2A
No outside circuit
V FB = 0V force driver on
1.25
1.4
V
1.5
DC Max. Duty Cycle (ON) V FB = 0V force driver on 100
% Min. Duty Cycle (OFF) V FB = 12V force driver off 0
I CL Current
Limit Peak current
No outside circuit
V FB = 0V force driver on
3 A
I L Output = 0
Output
Leakage
Current
No outside circuit
V FB = 12V force driver off
-200
uA Output = -1 V IN =
22V -5 mA
I Q Quiescent
Current V FB = 12V force driver off 5 10 mA
I STBY Standby Quiescent
Current
ON/OFF pin = 5V
V IN = 22V
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150
uA
200
V IL
ON/OFF Pin Logic Input
Threshold Voltage Low (regulator ON) -
1.3
0.6
V
V IH High (regulator OFF) 2.0 -丝瓜鸡蛋
I H ON/OFF Pin Logic Input
Current
V LOGIC = 2.5V (OFF) -0.01
uA
I L ON/OFF Pin Input Current V LOGIC = 0.5V (ON) -0.1 -1
θJA Thermal
Resistance SOP-8L Junction to
ca
15 o C/W
θJC Thermal Resistance回顾党的历史
with a copper area of
approximately 3 in2
SOP-8L
Junction to
ambient
70 o C/W
