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AP1503
300Khz, 2.5A PWM Buck DC/DC Converter Features
- Output voltage: 3.3V - 300KHz +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: 2.5A - SOP-7L packages - Low power standby mode - Built-in switching transistor on chip
General Description
The AP1503 series are monolithic ICs designed for step-down DC/DC converters, and own the ability of driving a 2.5A load without additional transistor components. Due to reducing the number of external component, the board space can be saved easily. The external shutdown function can be controlled by logic level and then come into standby mode. The external compensation makes feedback control have good line and load regulation. 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. The AP1503 series operates at a switching frequency of 300KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +2% 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. The packages are available in a standard SOP-7 lead package.
Applications
- Simple High-efficiency step-down regulator - On-card switching regulators - Positive to negative converter - DSL Modems - Portable Computers - Regulated Wall Adapters - Distributed Power
Pin Assignment
SOP7 with Heat Sink
Pin Descriptions
Name VIN VB Description Operating voltage input Boost pin ON/OFF Shutdown Output voltage feedback control Compensation pin Ground Switching output
VIN VB SD FB
1 2 3 4
7 6 5
VO GND COMP
SD FB COMP GND VO
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
Rev 1.0 Sep. 29, 2004 1/5
AP1503
300Khz, 2.5A PWM Buck DC/DC Converter Ordering Information
AP1503 XX X X X
Output version -33 : 3.3V
Package S : SOP-7L
Lead Free Blank : Normal L : Lead Free Package
Packing Blank : Tube A : Taping
Block Diagram
SD VIN
200mV Current Source bias 1.235V Reference 2.5V Regulator Start up 220mV
+ Comp _
Comp +
FB
Comp +
COMP
Anachip Corp. www.anachip.com.tw 2/5
_
+ Amp _
Frequecy compensation
Pre-driver
300kHz OSC.
Thermal Shutdown
_
VB
3A Switch
VO GND
Rev 1.0 Sep. 29, 2004
AP1503
300Khz, 2.5A PWM Buck DC/DC Converter Absolute Maximum Ratings
Symbol VCC VSD VFB VOUT PD TST TOP VOP Parameter Supply Voltage ON/OFF Pin input voltage Feedback Pin voltage Output voltage to Ground Power dissipation Storage temperature Operating temperature Operating voltage Rating +26 -0.3 to +25 -0.3 to +25 -1 Internally limited -65 to +150 -40 to +125 +7 to +40 Unit V V V V W o C o C V
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN=12V for 3.3V, 5V, ILOAD = 0.5A
Symbol FOSC VSAT DC ICL
Parameter Oscillator frequency Saturation voltage Max. Duty Cycle (ON) Min. Duty cycle (OFF) Current limit Output = 0 Output leakage Output = -1 current
Conditions
Min. 255 230
Typ. 300 0.4 90 0
Max. 345 360 0.5 0.6
Unit KHz V %
IL VC VB IB IQ ISTBY VIL VIH IH IL JC JA
ISW=2A VB=VIN+2.5V. VFB=0V force driver on VFB=6V force driver off Peak current No outside circuit VFB=0 force driver on no outside circuit VFB=6V force driver off VIN=24V
3
3.25
3.5 4 -1 -1
A uA mA V
COMP Min SW threshold Duty Cycle=0%,FB=3.5V 2A ISW threshold Min VB above switch ISW=2A ISW=1A Boost current ISW=2A Quiescent Current VFB=6 force driver off Standby Quiescent ON/OFF pin=5V Current VIN=24V Low (regulator ON) ON/OFF pin logic input threshold voltage High (regulator OFF) ON/OFF pin logic input VLOGIC=2.5V (OFF) current ON/OFF pin input current VLOGIC=0.5V (ON) Thermal Resistance SOP-7L Junction to case Thermal Resistance Junction to With copper area of SOP-7L 2 ambient approximately 0.5 in
0.04 0.8 2.6 120 130 5 80 2.0 1.3
3 140 10 150 200 0.6 -0.1 -1
V mA mA uA V uA
o o
20 50
C/W C/W
Anachip Corp. www.anachip.com.tw 3/5
Rev 1.0 Sep. 29, 2004
AP1503
300Khz, 2.5A PWM Buck DC/DC Converter Electrical Characteristics (Continued)
Symbol
VOUT
Parameter Output voltage Efficiency
Conditions 7V < VIN < 24V 0.2A < ILOAD < 2.5A VIN = 12V, ILOAD=2A
Typ. 3.3 79
Limit 3.23/3.2 3.37/3.4
Unit V VMIN VMAX %
AP1503-3.3V
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25C.
Typical Application Circuit
FB VB 2 VO CB
7V
DC Input Vin 1 3
4
D2
Schottky Diode
3.3V/2.5A
Output Load
AP1503 -33
5 SD 6
7
L1 D1
Inductor
Cin
Capacitor
COMP GND
Co
Capacitor
Schottky Diode
CC
Anachip Corp. www.anachip.com.tw 4/5
Rev 1.0 Sep. 29, 2004
AP1503
300Khz, 2.5A PWM Buck DC/DC Converter Marking Information
( Top View ) 7 5
Logo Output Type 33 : 3.3V
AP1503 XX YY WW X X
Blank: normal L: Lead Free Package ID code: internal Xth week: 01~52 Year: "01" = 2001 "02" = 2002
~
1
4
Package Information
Package Type: SOP-7L
C2 C3
A
B1 B2
E C1 C
e D
F
Symbol A B1 B2 C C1 C2 C3 D E e F
Dimensions In Millimeters Min. 5.79 3.83 3.78 4.80 1.57 0.32 1.17 0.19 0.48 1.35 Nom. 5.99 3.91 3.86 4.87 1.67 0.4 1.27 0.22 1.04REF 0.68 1.45 7o Max. 6.19 3.99 3.94 4.94 1.77 0.48 1.37 0.25 0.88 1.55
Dimensions In Inches Min. 0.228 0.151 0.149 0.189 0.062 0.013 0.046 0.007 0.019 0.053 Nom. 0.236 0.154 0.152 0.192 0.066 0.016 0.050 0.009 0.041REF 0.027 0.057 7o Max. 0.244 0.157 0.155 0.194 0.070 0.019 0.054 0.010 0.035 0.061
Anachip Corp. www.anachip.com.tw 5/5
Rev 1.0 Sep. 29, 2004

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