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Technical content

FEATURES

 Input voltage: 3.6V to +20V  Output voltage: 0.8V to VCC.  BM1513 is 2A  Oscillation frequency: 400KHz  Soft-start, Current limit, Enable function  Thermal Shutdown function  Built-in internal SW P-channel MOS  replace AP151x series  SOP-8L Pb-Free Package.

APPLICATIONS

 portable DVD  LCD Monitor  Graphic Card  DVD-Video Player  Telecom Equipment  ADSL Modem  Printer and other Peripheral Equipment  Microprocessor core supply  Networking power supply GENERAL DESCRIPTION BM1513 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. BM1513/A provides low-ripple power, high efficiency and excellent transient characteristics. The PWM control circuit is able to very the duty ratio linearly from 0 up to 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevent s overshoot at startup. An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 400KHz to 60KHz. Also, an internal compensation block is built in to minimum external component count. These ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L mini-package, providing such outstanding features as low current consumption. Since this converte r can accommodate an input voltage of up to 18V, it is also ideal when operating via an AC adapter. PIN ASSIGNMENTS PIN DESCRIPTIONS Name Pin Description FB 1 Feedback pin. FB 18 Vss EN 2

27 VssEN

H: Normal operation (Step-down operation) L: Step-down operation stopped (All circuits deactivated) Add an external resistor to set max output current. IC power supply pin Switch Pin. Connect external V C C Output inductor/diode here. MinimizeOutput 5、6 trace area at this pin to reduce EMI. VSS 7、8 GND Pin PWM Control 2A Step-Down Converter

BM1513-HPWM Control 2A Step-Down Converter BM1513 X E acking A: 3A ; Non-A means: 2A E means engineer, Non E means normal. Blank : Tube A : Taping Block Diagram Output Oscillation Reference Voltage Circuit Source with Soft Start Vcc +PWM-Switched FB Control Circuit Thermal Shutdown 100uAVON/OFF Vss EN OCSET Absolute Maximum Ratings Symbol Parameter Rating Unit VCC*1 VCC pin voltage VSS - 0.3 to VSS + 23 V VFB Feadback pin voltage VSS - 0.3 to VCC V VON/OFF*1 ON/OFF pin voltage VSS - 0.3 to VIN + 0.3 V VOUTPUT S w i t c h p i n v o l t a g e VSS - 0.3 to VIN + 0.3 V PD Power dissipation Internally limited mW o TOPR Operating temperature range -20 to +125 C o TSTG Storage temperature range -40 to +150 C Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions.

BM1513-HPWM Control 2A Step-Down Converter Electrical Characteristics (VIN = 12V, Ta=25°C, unless otherwise specified) Symbol Parameter Conditions Min. Typ. Max. Unit VFB Feedback Voltage -- 0.784 0.8 0.816 V VIN Input voltage -- 3.6 -- 20 V ISW Switch Current (1513/A) -- 2A -- -- A Current consumption ISSS VON/OFF =0V -- 10 -- µAduring power off ∆VOUT VIN = 3.6V~18V -- 0.6 1 % /VOUT Line regulation ∆VOUT IOUT = 0 to 2A -- 0.2 0.5 % /VOUT Load regulation fOSC Oscillation frequency Measure waveform at SW pin 360 400 440 KHz fOSC1 Frequency of current limit or Measure waveform at SW pin 8 160 16 KHzshort circuit protect VSH Evaluate oscillation at SW pin 2.0 -- -- V VSL EN pin input voltage Evaluate oscillation stop at SW pin -- -- 0.8 ISH EN pin input leakage -- -10 -- 10 µA ISL current -- -10 -- 10 µA IOCSET OCSET pin bias current -- 90 100 110 µA TSS Soft-Start time -- 0.3 2 5 ms RDSON Internal MOSFET Rdson -- - 100 150 m Ω VIN = 12V, VOUT = 5V EFFI Efficiency -- 92 -- % IOUT = 2A Typical Application Circuit V OUT V IN Vcc Output COCSET C R A R OCSET C Optional FB OCSET + BM1513 R B C OUT CVcc D1 R EN 20K C ENIN V SS C EN 0.1µ Note: VOUT = VFB x (1+RA/RB) R B=1K~10K ohm

BM1513-HPWM Control 2A Step-Down Converter Typical Performance Characteristics BM1513 Vin v.s. FB BM1513 Efficiency (Vout=3.3V; Iout=0.5A) (Vin=12V) 0.81 96 0.805 Vout=5V 0.8 92 0.795 88 Vout=3.3V 0.79 0.785 84 Vout =3V 0.78 80 0.775 0.77 76 0.765 72 0.76 0 0.5 1 1.5 2 0 5 10 15 20 Iout (A) Vin (V) BM1513 Vin v.s. Frequency BM1513 Load Regulation (Vout=3.3V; Iout=0.5A) (Vin=12V) 410 3.35 400 390 3.3 440 410 3.25 380 350 3.2 340 330 3.15 320 310 3.1 0 5 10 15 20 0 0.5 1 1.5 2 Vin (V) Iout (A)

BM1513-HPWM Control 2A Step-Down Converter Typical Performance Characteristics (Continued) BM1513 Vout Ripple BM1513 Vout Ripple (Vin=12V; Vout=3.3V; Iout=0.2A) (Vin=12V; Vout=3.3V; Iout=2A) Test Circuit Open OUTPUT Open OUTPUT VCC FB A VCC FB OCSET + OCSET A EN ENVSS VSS OUTPUT VCC FB OCSET + + V EN VSS VSS VSS Output Output FB EN OCSET VCC B220 4.7K C2 470uF R2 1.5K 0.1uF 100K R4 470uF ON OFF VIN 12v VOUT 3.3v L 22 uH

BM1513-HPWM Control 2A Step-Down Converter PWM Control Max. Current Limiting Under Voltage Lockout The under voltage lockout circuit of the BM1513 assures that the high-side MOSFET driver outputs remain in the off state whenever the supply voltage drops below set parameters. Lockout occurs if V CC falls below 3.3V. Normal operation resumes once V CC rises above 3.5V. 8 5 BM1513 Y WW X P The BM1513 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the BM1513, the pulse width varies in a range from 0 to 100, according to the load current, and yet ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. The output voltage is programmed by selection of the divider R1 and R2. Designer should use resistors R1 and R2 with ±1% tolerance in order to obtain best accuracy of output voltage. The output voltage can be calculated from the following formula. Vout = 0.8 x ( 1 + R1 / R2) Select a value for R2 between 0.5KΩ and 10KΩ. The lower resistor values minimize noise pickup in the sensitive feedback pin. Recommended resistance value list below: V o = 3.3V V o = 5.0V R1 4.7K 6.8K R2 1.5K 1.3K Output Voltage Definition The current limit threshold is setting by connecting an external resistor from VCC supply to OCSET. The voltage drop across this resistor is due to the 100uA internal sink sets the voltage at the pin. When the PWM voltage is less than the voltage at OCSET, an over-current condition occurs. Select a value for R OCSET to set the current limit level by using this formula: ILOAD = (I OCSET x ROCSET)/ RDSON In which the R DSON =100 mΩ、IOCSET =100uA, if the ROCSET =3K then the I LOAD have 3A maximum transient current. Note: BM1513A is fully same as BM1513 , only bigger current output , BM1513A can replace BM1513 without change anything in external.

BM1513-HPWM Control 2A Step-Down Converter

Package Information

Package Type: SOP-8L L VIEW "A" D 0.015x45 7 (4X) 7 (4X) e B VIEW "A" y A1 0.10 - 0.25 0.040 - 0.100 θ 0 O - 8O 0O - 8O