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AP2004
PWM BUCK CONTROLLER
Features
* * * * * * * * * * PWM Buck Control Circuitry Operating voltage can be up to 27V Under voltage Lockout (UVLO) Protection Short Circuit Protection (SCP) Soft-start circuit Variable Oscillator Frequency -- 300Khz Max 1.25V voltage reference Output 8-pin SOP package SOP-8L: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1)
General Description
The AP2004 integrates Pulse-Width-Modulation (PWM) control circuit into a single chip, mainly designs for power-supply regulator. All the functions include an on-chip 1.25V reference output, an error amplifier, an adjustable oscillator, a soft-start, UVLO, SCP circuitry, and a push-pull output circuit. Switching frequency is adjustable by trimming CT. During low VCC situation, the UVLO makes sure that the outputs are off until the internal circuit operates normally.
Applications
* * * * Backlight inverter LCD Monitor CDROM, XDSL Product DC/DC converters in computers, etc.
Ordering Information
AP 2004 S X - 13
Package S : SOP-8L Lead Free L : Lead Free G : Green
Packaging (Note 2) SOP-8L SOP-8L
Packing
13 : Tape & Reel
Device
Lead-free
AP2004SL-13 AP2004SG-13
Notes:
Package Code S S
13" Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.
AP2004 Rev. 3
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AP2004
PWM BUCK CONTROLLER
Pin Assignments
( Top View )
OUT VCC COMP FB 1 2 3 4 8 7 6 5 GND CT SS SCP
SOP-8L
Pin Descriptions
Pin Name CT FB SS COMP OUT GND VCC SCP Timing Capacitor Voltage Feedback Soft-Start.
Description
Feedback Loop Compensation PWM Output Ground Supply Voltage Short Circuit Protection
AP2004 Rev. 3
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AP2004
PWM BUCK CONTROLLER
Block Diagram
VCC SS CT
1.25V
Bandgap Reference
2.5V Internal use
UVLO
Oscillator
VCC
MAX 300KHz .
Iss PWM Amplifier FB
+ + Error Amplifier
OUT
COMP
1.5V +
0.7V
+
SCP
GND
Absolute Maximum Ratings
Symbol PD VCC VI VO ISOURCE ISINK TOP TST Parameter Power dissipation at 25C Supply voltage Amplifier input voltage Collector output voltage Source current Sink current Operating junction temperature range Storage temperature range Rating 600 28 20 VCC-1.0V 200 200 -20 to +125 -65 to +150 Unit mW V V V mA mA o C o C
Recommended Operating Conditions
Symbol VCC VI VO IFB RF CT FOSC Supply voltage Amplifier input voltage Collector output voltage Current into feedback terminal Feedback resistor Timing capacitor Oscillator frequency 100 100 10 6800 300 Parameter Min 3.6 1.05 Max 27 1.45 Vcc-1.5 45 Unit V V V A k pF KHz
AP2004 Rev. 3
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AP2004
PWM BUCK CONTROLLER
Electrical Characteristics
(TA = 25C, VCC = 6V, f = 200 Khz)
Reference (REF) Symbol Parameter Comp connect to FB VREF Output voltage change with temperature Under voltage lockout (UVLO) Symbol Parameter VUT Upper threshold voltage (VCC) VLWT Lower threshold voltage (VCC) VHT Hysteresis (VCC) Short-circuit protection (SCP) control Symbol Parameter VIT Input threshold voltage VSTB Standby voltage VLT Latched input voltage ISCP Input (source) current Comparator threshold voltage VCT (COMP) Oscillator (OSC) Symbol Parameter FOSC Frequency Standard deviation of frequency FOSC Frequency change with voltage Error-amplifier Symbol Parameter VIO Input offset voltage IIO Input offset current IIB Input bias current VCM AV GBW CMRR VOH VOL IOI IOO Common-mode input voltage range Open-loop voltage amplification Unity-gain bandwidth Common-mode rejection ratio Max. output voltage Min. output voltage Output (sink) current (COMP) Output (source) current (COMP)
Conditions TA = -20C ~ 25C TA = 25C ~ 85C Conditions IO(REF) = 0.1mA TA = 25C
Min 1.225
Typ. 1.25 -0.1 -0.2 Typ. 2.9 2.4 500 Typ. 0.67 130 50 -15 1.5
Max 1.275 1 1 Max
Unit V % % Unit V V mV Unit V mV mV A V
Min
Conditions TA = 25C No pull up No pull up VI = 0.7V, TA = 25C
Min 0.60 100 -10
Max 0.75 160 100 -20
Conditions CT = 270 pF CT = 270 pF VCC = 3.6V ~ 20V Conditions VO (FB) = 1.25V VO (FB) = 1.25V VO (FB) = 1.25V VCC = 3.6V ~ 20V RF = 200 k
Min
Typ. 200 10 1 Typ.
Max
Unit KHz %
Min
160 1.05 70 60 Vref-0.1 80 1.5 80
Max 6 100 500 1.45
Unit mV nA nA V dB MHz dB V V mA A
1 VID = -0.1V, VO = 1.25V VID = 0.1V, VO = 1.25V 0.5 -45 1.6 -70
AP2004 Rev. 3
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AP2004
PWM BUCK CONTROLLER
Electrical Characteristics
Output section Symbol ILEAK IDRV VSAT Sink current Source current Output saturation voltage Parameter
(Continued) (TA = 25C, VCC = 6V, f = 200 Khz)
Conditions VO = 25V VIN = 20V VIN = 20V IO = 10 mA VO = 6V Conditions
Min
Typ. 200 200 1.0 120
Max 10
Unit A mA mA
Leakage current
1.5
V mA
ISC Short-circuit output current PWM comparator Symbol Parameter VT0 VT100 Total device Symbol ICCA Soft Start Symbol VSS ISS
Min 1.2 Min
Typ. 0.6 1.3 Typ. 6
Max 0.7
Unit V V
Input threshold voltage at f = 10 KHz CT (COMP) Maximum duty cycle Parameter Average supply current Parameter Soft-start Voltage Constant Charge Current Conditions CT = 270pF Conditions
Max 10 Max
Unit mA Unit V A
Min
Typ. 2.3 20
Typical Application Circuit
R3 1K~30K
Vcc = 12V
C2 10nF Optional 1 OUT GND 8 2 VCC CT 7 3 COMP SS 6 FB SCP 5 C4 270pF C5 50nF C6 220nF 4 Q1 P mos AF9435P AF4835P 5A C1 470uF L1 22uH R1 9K Output 5V/5A C4 50nF Optional C3 470uF R2 3K
Vout=Vref 1 +

R1 R2
Step-Down DC/DC converter
AP2004 Rev. 3
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AP2004
PWM BUCK CONTROLLER
Typical Characteristics
REFERENCE OUTPUT VOLTAGE vs. POWER-SUPPLY VOLTAGE
1.26 1.255 1.25 1.245 1.24 1.235 1.23 1.225 1.22 4 8 12 16 20 24 28
AVERAGE SUPPLY CURRENT vs. POWER-SUPPLY VOLTAGE
5
VrefReference Output Voltage (V)
Icc-Average Supply Current (mA)
4 3 2 1 0 0 4 8 12 16 20 24 28
Vcc-Power Supply Voltage (V)
Vcc - Power-Supply Voltgae (V)
VCT(min) VCT(max)
AVERAGE SUPPLY CURRENT vs. AMBIENT TEMPERATURE
7
VCT vs. Frequency
1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 100 200
ICC - Average Supply Current (mA)
6 5 4 3 2 -50 -25 0 25 50 75 100
VCT (V)
300
TA - Ambient Temperatrure()
Frequency (KHz)
350
OSCILLATOR FREQUENCY vs. TIMING CAPACITANCE
tscp-SCP Time-out Period (ms)
35 30 25 20 15 10 5 0 45
SCP TIME-OUT PERIOD vs. SCP CAPACITANCE
fosc - Frequency (KHz)
300 250 200 150 100 50 0
100 600 1100 1600 2100 2600 3100 3600 4100 4600 5100 5600 6100 6600
90 135 180 225 270 315 360 405 450 495
CT-Timing Capacitor (pF)
Cscp - SCP Capacitance (nF)
AP2004 Rev. 3
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AP2004
PWM BUCK CONTROLLER
Typical Characteristics (Continued)
SOFT-START TIME (Ts) vs. SOFT-START CAPACITOR (Css)
30 25 20 15 10 5 0 25 50 75 100 125 150 175 200
Ts (mS)
Css (nF)
Marking Information
(1) SOP-8L
( Top View )
8 5
Logo Part Number AP2004 YY WW X X
1 4
L : Lead Free G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code
AP2004 Rev. 3
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AP2004
PWM BUCK CONTROLLER
Package Information
(1) Package Type: SOP- 8L
(All Dimensions in mm)
3.85/3.95
5.90/6.10
0.10/0.20
0.254 0.62/0.82
Gauge Plane Seating Plane
Detail "A"
7~9 1.30/1.50 1.75max. 0.15/0.25
0.35max. 45
7~9
Detail "A"
0/8
1.27typ 4.85/4.95
0.3/0.5
8x-0.60 5.4 6x-1.27 8x-1.55
Land Pattern Recommendation (Unit: mm)
IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated.
AP2004 Rev. 3
8 of 8 www.diodes.com
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