AP2008
PWM BUCK CONTROLLER
Features
• • • • • • • • • • PWM Buck Control Circuitry Operating voltage can be up to 20V Under voltage Lockout (UVLO) Protection Short Circuit Protection (SCP) Soft-start circuit Variable Oscillator Frequency -- 300Khz Max 0.77V 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 AP2008 integrates Pulse-Width-Modulation (PWM) control circuit into a single chip, mainly designs for power-supply regulator. All the functions include an on-chip 0.77V 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 is operational normally.
Applications
• • • • Backlight inverter LCD Monitor XDROM, XDSL Product DC/DC converters in computers, etc.
Ordering Information
AP 2008 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
AP2008SL-13 AP2008SG-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.
AP2008 Rev. 2
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AP2008
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 OUT VCC COMP FB SCP SS CT GND PWM Output Supply Voltage Feedback Loop Compensation Voltage Feedback Short Circuit Protection Soft-Start. Timing Capacitor Ground Description
AP2008 Rev. 2
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AP2008
PWM BUCK CONTROLLER
Block Diagram
VCC SS CT
10K-300KHz / CT value
0.77V
Bandgap Reference
2.5V Internal use
UVLO
Oscillator VCC
Iss PWM Amplifier FB + + Error Amplifier OUT
COMP 1.5V + 0.7V +
SCP
GND
Absolute Maximum Ratings
Symbol VCC VI VO ISOURCE ISINK TOP TST Supply voltage Amplifier input voltage Collector output voltage Source current Sink current Operating temperature range Storage temperature range Parameter Rating 22 20 VCC-1.0V 200 200 -20 to +85 -65 to +150 Unit V V V mA mA
o o
C C
Recommended Operating Conditions
Symbol VCC VI VO IFB RF CT FOSC
AP2008 Rev. 2
Parameter Supply voltage Amplifier input voltage Collector output voltage Current into feedback terminal Feedback resistor Timing capacitor Oscillator frequency
Min 3.6 1.05
Max 20 1.45 Vcc-1.5 45
Unit V V V µA kΩ pF KHz
100 100 10 6800 300
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AP2008
PWM BUCK CONTROLLER
Electrical Characteristics
(TA=25ºC, 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 ΔFOSC 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 = -20ºC ~ 25ºC TA = 25ºC ~ 85ºC Conditions IO(REF) = 0.1mA TA = 25ºC
Min 0.755
Typ. 0.770 -0.1 -0.2 Typ. 2.9 2.4 500 Typ. 0.67 130 50 -15 1.5
Max 0.785 ±1 ±1 Max
Unit V % % Unit V V mV Unit V mV mV µA V
Min
Conditions TA = 25ºC No pull up No pull up VI = 0.7V, TA = 25ºC
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)=0.77V VO (FB)=0.77V VO (FB)=0.77V VCC=3.6V ~ 20V RF=200 kΩ
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 µA
1 VID = -0.1V, VO = 0.77V VID = 0.1V, VO = 0.77V 0.5 -45 1.6 -70
AP2008 Rev. 2
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AP2008
PWM BUCK CONTROLLER
Electrical Characteristics
Output section Symbol ILEAK IDRV VSAT Sink current Source current Output saturation voltage Parameter
(Continued) (TA=25ºC, VCC=6V, f=200 Khz)
Conditions VO = 20V VIN= 12V VIN= 12V IO = 10 mA VO = 6V Conditions
Min
Typ. 200 200 1.0 120
Max 10
Unit µA 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=6800pF (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 µA
Min
Typ. 2.3 20
Typical Application Circuit
R3 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 L1 10uH 5A R1 1K C1 470uF
Output
C4 50nF (Optional)
1V/5A
C3 470uF
R2 4K
Step-Down DC/DC converter
AP2008 Rev. 2
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AP2008
PWM BUCK CONTROLLER
Typical Characteristics
REFERENCE OUTPUT VOLTAGE vs. POWER-SUPPLY VOLTAGE
0.785 0.78 0.775 0.77 0.765 0.76 0.755
AVERAGE SUPPLY CURRENT vs. POWER-SUPPLY VOLTAGE
5
Icc-Average Supply Current (mA)
VrefReference Output Voltage (V)
4 3 2 1 0 0 4 8 12 16 20
4
6
8
10
12
14
16
18
20
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 Temperature (℃)
Frequency (KHz)
350
OSCILLATOR FREQUENCY vs. TIMING CAPACITANCE
tscp-SCP Time-out Period (ms)
fosc - Frequency (KHz)
300 250 200 150 100 50 0
100 600 1100 1600 2100 2600 3100 3600 4100 4600 5100 5600 6100 6600
35 30 25 20 15 10 5 0 45
SCP TIME-OUT PERIOD vs. SCP CAPACITANCE
90 135 180 225 270 315 360 405 450 495
CT-Timing Capacitor (pF)
Cscp - SCP Capacitance (nF)
AP2008 Rev. 2
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AP2008
PWM BUCK CONTROLLER
Typical Characteristics
(Continued)
SOFT-START TIME (Ts) vs. SOFT-START CAPACITOR (Css)
30 25
Ts (mS)
20 15 10 5 0 25 50 75 100 125 150 175 200
Css (nF)
Marking Information
(1) SOP-8L
( Top View )
8 5
Logo Part Number AP2008 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
AP2008 Rev. 2
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AP2008
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.
AP2008 Rev. 2
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