General Description
The TD1501 is a ries of easy to u fixed and adjustable step-down (buck) switch-mode voltage regulators. The devices are available in fixed output voltage of 3.3V, 5V, and an adjustable output version. Both versions are capable of driving a 3A load with excellent line and load regulation.
Requiring a minimum number of external components, the regulators are simple to u and include internal frequency compensation, and a fixed-frequency oscillator.
The output voltage is guaranteed to ±3% tolerance under specified input voltage and output load conditions. The oscillator frequency is guaranteed to ±15%. External shutdown is included, featuring typically 80 µA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.
The TD1501 is available in TO-220B-5L TO220-5L and TO-263-5L packages. Features
课英文
• 3.3V, 5V and adjustable output versions
• Output adjustable from 1.23v to 43V
• Fixed 150KHz frequency internal oscillator
• Guaranteed 3A output load current
• Input voltage range up to 45V
• Low power standby mode, I Q typically 80 µA • TTL shutdown capability
• Excellent line and load regulation
• Requires only 4 external components
• High efficiency
• Thermal shutdown and current limit protection • Available in TO-220B/TO220 and TO-263 packages
Applications
• Simple High-efficiency step-down regulator • On-card switching regulators
• Positive to negative converter
• LCD monitor and LCD TV
什么犹豫• DVD recorder and PDP TV
• Battery charger
• Step-down to 3.3V for microprocessors
Package Types
Figure 1. Package Types of TD1501
TO220-5L
Pin Descriptions
Ordering Information
Name Description Vin
Input supply voltage
Output Switching output Gnd Ground Feedback
Output voltage feedback
ON/OFF ON/OFF shutdown
Active is “Low” or floating
5 ON/OFF 4 Feedback 3 Gnd 2 Output 1 Vin
Functional Block Diagram
Figure 2. Functional Block Diagram of TD1501 Typical Application (Fixed Output Voltage Versions)
Figure 3. Typical Application of TD1501
Absolute Maximum Ratings
Note1: Stress greater than tho listed under Maximum Ratings may cau permanent damage to the device. This is a stress rating only and functional operation of the device at the or any other conditions above tho indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
东的英文Parameter Value Unit Supply Voltage Vin -0.3 to 45 V Feedback VFB pin voltage -0.3 to Vin+0.3 V ON/OFF Pin voltage -0.3 to Vin+0.3 V Output pin voltage
-
0.3 to Vin+0.3
V Output Voltage to Ground (Steady State) -1
V Power Dissipation
Internally limited W Operating Temperature Range -40 to +125 ºC Storage Temperature
-65 to +150
ºC Lead Temperature (Soldering, 10 c)
260
ºC
ESD(HM) 2000 V
Thermal Resistance-Junction to Ambient(R θJA) 23 ºC / W Thermal Resistance-Junction to Ca(R θJC)
3.5
ºC / W
Electrical Characteristics (All Output Voltage Versions)
Unless otherwi specified, Vin = 12V for 3.3V, 5V, adjustable version. Iload = 0.5A, Ta = 25℃.
Symbol Parameter Conditions
Min. Typ. Max. Unit
I b
Feedback bias current
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Adjustable only, V FB = 1.3V
10 50/100 nA I Q Quiescent current V FB =12V force driver off
5
10
mA I STBY
Standby quiescent current
ON/OFF=5V, V IN =36V 80
200/250uA
F OSC Oscillator frequency 127 150 173 KHz
V SAT Saturation voltage I OUT =3A 1.2 1.4/1.5 V I CL Current Limit
Peak Current (V FB =0V) 4.5 5.5/6.5 A I L
I L Output leakage current Output=0V (V FB =12V) 50 uA Output leakage current Output=-1V (V IN =36V) 2 30 mA V IL
ON/OFF pin logic input
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Low (Regulator ON)
1.3
0.6
V
V IH Threshold
voltage High (Regulator OFF) 2.0 1.3 V
I H
I L ON/OFF pin input current V LOGIC=2.5V(Regulator OFF) 5 15 uA V LOGIC=0.5V(Regulator ON) 0.02
5 uA
θJC Thermal Resistance
Junction to Ca
TO220B-5L/TO220-5L
梦到妈妈去世了
TO263-5L
2.5
3.5
O C/W
θJA Thermal Resistance
Junction to Ambient
(Note1)
TO220B-5L/TO220-5L
TO263-5L
28
23
O C/W
TD1501 ADJ Vout: Output Voltage
11V≤V IN≤45V, 0.2A≤I LOAD≤
3A, V OUT for 9V
1.193/
1.180
1.23
1.267/
1.280 V η: Efficiency V IN=12V,V OUT=9V,I LOAD=3A 88 %
TD1501 3.3V Vout: Output Voltage
4.75V≤V IN≤45V, 0.2A≤I LOAD
≤3A
3.168/
繁华三千
3.135
3.3
3.432/
3.465 V η: Efficiency V IN=12V, I LOAD
=3A
76 %
TD1501 5V Vout: Output Voltage
7V≤V IN≤45V, 0.2A≤I LOAD≤
3A
4.800/
征兵标语4.750
5.0
5.200/
5.250 V η: Efficiency V IN=12V, I LOAD
=3A
83 %
Specifications with boldface type are for full operationg temperature range, the other type are for T J=25O C.
Note1: Thermal resistance with copper area of approximately 3 in2.
Typical Performance Characteristics
Figure 4. Output Voltage vs. Temperature Figure 5. Switching Frequency vs. Temperature
Figure 6. Output Saturation Characteristics Figure 7. Quiescent Current vs. Temperature
