APE1707 150KHz, Buck DC/DC Converter GENERAL DESCRIPTION
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APE1707
150KHz, Buck DC/DC Converter
GENERAL DESCRIPTION
APE1707 series monolithic designed step-down DC/DC converter, ability driving load without additional transistor. saves board space. external shutdown function controlled logic level then come into standby mode. internal compensation makes feedback control having good line load regulation without external design. Regarding protected function, thermal shutdown prevent over temperature operating from damage, current limit against over current operating output switch. current limit function occurs down below 0.5V, switching frequency will reduced. APE1707 series operates switching frequency 150KHz thus allow smaller sized filter components than what would needed with lower frequency switching regulators. output version included fixed 3.3V, 12V, adjustable type. chips available standard 8-lead package.
FEATURES
Output voltage: 3.3V, adjustable output version1. Adjustable version output voltage range, 1.23V 38.5V. 150KHz fixed switching frequency. Voltage mode non-synchronous control. Thermal-shutdown current-limit protection. ON/OFF shutdown control input. Short Circuit Protect (SCP). Operating voltage 40V. Output load current: SOP-8L Pb-Free packages. power standby mode. Built-in switching transistor chip.
Data specifications subject change without notice
20080514pre
APE1707
BLOCK DIAGRAM
200mV
220mV CURRENT SOURCE BIAS 1.235V REFERENCE 2.5V REGULATOR START
COMP.
Current limit
COMP.
COMP.
COMP.
CONTROL DRIVER
Thermal Shutdown
R2=0O, R1=OPEN
ASSIGNMENT
package APE1707 SOP-8L; assignment given Name Description Operating voltage input Switching output Output voltage feedback control ON/OFF Shutdown
(Top View)
SOP-8L
150kHz OSC.
SWITCH
APE1707
ORDER INFORMATION Order Information
APE1707X-XX Package Type SOP-8L Output Voltage 33:3.3V 50:5.0V Blank:ADJ
MARKING INFORMATION Marking
1707M
Part number code: internal 01~52 Year 2008
1707M-50
Part number Output Voltage code: internal 01~52 Year 2008
ABSOLUTE MAXIMUM RATINGS
Characteristics Maximum Supply Voltage ON/OFF Input Voltage Feedback Voltage Output Voltage Ground Power Dissipation Internally limited Storage Temperature Range Operating Junction Temperature Range Operating Supply Voltage Thermal Resistance from Junction case Thermal Resistance from Junction ambient Symbol VOUT Rating -0.3 -0.3 -0.8 TJ-TA +150 +125 +4.5
APE1707
Unit
Note measured with copper area(need connect pins) approximately (Multi-layer).
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta=25°C, VCC=12V 3.3V,
adjustable version VCC=18V version. ILOAD 0.2A)
Characteristics Quiescent Current Feedback bias current Shutdown supply Current Oscillator frequency Oscillator frequency short circuit protect Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Current limit
Symbol FOSC FSCP
Conditions VFB=12V force driver VFB=1.3V (Adjustable version only) pin=5V VCC=40V
Units
(Adjustable) When VFB<0.5V (Fixed)When VOUT*40% VFB=0V force driver VFB=12V force driver Pear current, outside circuit FB=0V force driver IOUT IOUT=2A, outside circuit VFB=0V force driver outside circuit VFB=12V force driver VCC=40V force driver (regulator High (regulator OFF) VEN=2.5V (OFF) VEN=0.5V (ON)
Load Regulation( VOUT/VOUT VOUT Saturation voltage pin=0V pin=-0.8V leakage current
-200
-0.1 -0.01
logic input threshold voltage logic input current input current
Thermal shutdown Temp
ELECTRICAL CHARACTERISTICS (Continued)
version Characteristics Symbol
Output Feedback
APE1707-ADJ
APE1707
Conditions
ILOAD =0.2A VOUT programmed 3.3V
1.193
1.23
1.267
Units
voltage Efficiency Output voltage
12V, ILOAD=2A ILOAD =0.2A 12V, ILOAD=2A ILOAD =0.2A 12V, ILOAD=2A ILOAD =0.2A 15V, ILOAD 11.64 4.85 3.20
3.40
3.30
APE1707-3.3V
Efficiency Output voltage
APE1707-5.0V
5.00
12.0 12.36 5.15
Efficiency Output voltage
APE1707-12V
Efficiency
APE1707
APPLICATION CIRCUIT
Adjustable Output Voltage Version
VIN=12 0.1uF 340A 47uH 4.7K Vout=5.0
0.1uF
1.5K
APE1707
Adjustable Output Voltage Version With Delayed Startup
VIN=12V 0.1uF 100k B240A 470uF 0.1uF 1.8K 33uH Vout=2.5V/2A 1.8K
470uF
0.1uF
ON/OFF
APE1707
Vout
1.23V, 0.47K
Table Resistor select output voltage setting VOUT 3.3V 2.5V 1.8V 1.5K 1.8K 1.5K 1.8K 1.8K 1.8K 4.7K 5.6K 2.5K 3.0K 1.8K 0.82K
recommend value (IOUT=2A,) VOUT VIN=12V VIN=24V 2.5V 33uH 33uH 3.3V 33uH 33uH 47uH 47uH 68uH
APE1707
Fixed Output Voltage Version
VIN=12~24V 470uF 0.1uF B340A 470uF 0.1uF 33uH Vout=3.3V/2A
APE1707-33
Inverting Regulator with Delayed Startup
VIN=5~20V 2A/30V 0.1uF 220uF 220uF 0.1uF 33uH 100k 100uF 3A/20V VOUT -5V200mA 0.1uF IN5400
APE1707-50
APE1707
FUNCTION DESCRIPTIONS
Functions This positive input supply switching regulator. suitable input bypass capacitor must presented this minimize voltage transients supply switching currents needed regulator. Circuit ground. Internal switch. voltage this switches between (+VCC VSAT) approximately 0.5V, with duty cycle approximately VOUT VCC. minimize coupling sensitive circuitry, board copper area connected this should minimized. Feedback Senses regulated output voltage complete feedback loop. Allows switching regulator circuit shutdown using logic level signals thus dropping total input supply current approximately 100uA. Pulling this below threshold voltage approximately 1.3V turns regulator pulling this above 1.3V maximum Vcc) shuts regulator down. this shutdown feature needed, wired ground pin. Thermal Considerations SOP-8 package needs heat sink under most conditions. size heat sink depends input voltage, output voltage, load current ambient temperature. APE1707 junction temperature rises above ambient temperature load different input output voltages. data these curves taken with APE1707 (SOP-8 package) operating buck-switching regulator ambient temperature (still air). These temperature increments approximate affected many factors. Higher ambient temperatures requires more heat sinker.
APE1707
FUNCTION DESCRIPTIONS (Continued)
best thermal performance, wide copper traces generous amounts printed circuit board copper (need connect pins) should used board layout, (One exception SW(switch) pin, which should have large areas copper.) Large areas copper provide best transfer heat (lower thermal resistance) surrounding air, moving lowers thermal resistance even further. Package thermal resistance junction temperature increments approximate. increments affected factors. Some these factors include board size, shape, thickness, position, location, even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single double-sided, multi-layer board amount solder board. effectiveness board dissipate heat also depends size, quantity spacing other components board, well whether surrounding still moving. Furthermore, some these components such
catch diode will heat board heat vary input voltage changes. inductor, depending physical size, type core material resistance, could either heat sink taking heat away from board, could heat board.
TYPICAL CHARACTERISTICS
Output Ripple (VIN=12V, VOUT=3.3V, IOUT=2A)
APE1707
Power test wave (VIN=12V, VOUT=5V, IOUT=2A
VOUT VOUT (AC)
Load Transient Response (VIN=12V, VOUT=3.3V, IOUT=0.1~2A)
test wave (VIN=12V, VOUT=5V, IOUT=2A
VOUT VOUT (AC) VOUT
Efficiency (VIN=12V, VOUT=3.3V)
Vin=12V
Efficiency (VIN=12V, VOUT=5.0V)
Vin=12V
Efficiency(%)
Efficiency(%)
Iout(A)
Iout(A)
ADVANCED POWER ELECTRONICS CORP.
Package Outline SO-8
SYMBOLS
Millimeters
1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.38
1.55 0.18 0.41 0.22 4.90 3.90 6.15 0.71 4.00 1.27
1.75 0.25 0.51 0.25 5.00 4.00 6.50 1.27 8.00
DETAIL
1.All Dimension Millimeters. 2.Dimension Does Include Mold Protrusions.
DETAIL
Part Marking Information Packing SO-8
Part Number Package Code
1707M-XX
YWWSSS
Output Voltage Date Code (YWWSSS) YLast Digit Year WWWeek SSSSequence
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