8-PIN Single Synchronous Buck Controller Operating Voltage Single

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8-PIN Single Synchronous Buck Controller Operating Voltage Single

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APW7057
8-PIN Single Synchronous Buck Controller
Operating Voltage Single Input Both 3.3V Input
General Description
APW7057 fixed 300kHz frequency, voltage mode, synchronous controller which drives dual N-channel MOSFETs designed work from single input supply both 3.3V inputs, providing excellent regulation output load variation. integrates controls, monitoring protection functions into single 8-pin package. power-on-reset (POR) circuit monitors supply voltage start up/shutdown power on/off. Internal 0.8V temperature-compensated reference voltage designed meet output voltage further applications. Additional built-in soft-start function sets soft-start interval prevent output voltage from overshoot well limiting input current. controller's over-current protection (OCP) monitors output current using voltage drop across high-side MOSFET's RDS(ON), eliminating need current sensing resistor. additional under-voltage protection(UVP) monitors voltage short-circuit protection. over-current under-voltage protections trip cycle soft-start function until third fault events happened. Pulling holding OCSET below 1.25V with open drain device shuts down controller.
Simple 8-PIN Package Drive Dual N-Channel MOSFETs Built-in Feedback Compensation Steady-State Error Voltage-Mode Control
Full 0~100% Duty Ratio
Fast Transient Response
0.8V Internal Reference Voltage ±1.5% Accuracy Over Line, Load Temp.
Programmable Over-Current Protection Using (ON) High-Side MOSFET Under-Voltage Protection Adjustable Output Voltage External ResistorDivider Small Converter Size 300kHz Constant Switching Frequency
Built-In Soft-Start (2mS typ.)
Shutdown Control
Applications
Motherboard Graphics Cards DC-DC Converter Supplied from Single Input DC-DC Converter Supplied from 3.3V Inputs
Description
BOOT UGATE LGATE PHASE OCSET
SOP-8 (Top View
ANPEC reserves right make changes improve reliability manufacturability without notice, advise customers obtain latest version relevant information verify before placing orders. Copyright ANPEC Electronics Corp. Rev. Jun., 2003 www.anpec.com.tw
APW7057
Ordering Marking Information
7057
ange ackage Tube Tape
7057
7057 XXXXX
Block Diagram
BOOT
ower
40uA
OCSET
oft-S tart ault Logic
PHASE UGATE
ft-S
Control
lifie
LGATE
illator
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
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APW7057
Typical Application
470pF
1N4148
47uF
+2.5V/10A
APM2014N APM2014N APM2300A 1000µF/10V, ESR=25 1000µF/6.3V, ESR=25
Absolute Maximum Ratings
Symbol BOOT Parameter Supply Voltage (VCC GND) BOOT Supply Voltage (BOOT GND) PHASE, OCSET Input Voltage Input Voltage Maxim Junction perature Storage perature Maxim Soldering perature, Seconds Minim Rating Rating -0.3 -0.3 -0.3 -0.3 +0.3 Unit
Thermal Characteristics
Symbol Parameter Junction-to-Ambient Resistance free (SOP-8)
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
Value
Unit
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APW7057
Recommended Operating Conditions
Symbol Supply Voltage Output Voltage Switching Regulator (Note) Input Voltage Switching Regulator (Note) Ambient Temperature Junction Temperature Parameter Range Unit
Note Refer typical application circuit
Electrical Characteristics
Unless otherwise specified, these specifications apply over VCC=5V, VBOOT=12V 0~70 Typical values TA=25oC.
Symbol Parameter Test Conditions APW7057 Unit
SUPPLY CURRENT IVCC IBOOT Nominal Supply Current BOOT Nominal Supply Current Rising Threshold Falling Threshold OSCILLATOR FOSC Free Running Frequency Ramp Upper Threshold Ramp Lower Threshold VOSC VREF Ramp Amplitude Reference Voltage Reference Voltage Accuracy ERROR AMPLIFIER Gain First Pole Frequency First Zero Frequency UGATE Duty Range Input Current
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
UGATE LGATE Open UGATE Open
POWER-ON RESET(POR) 2.85 0.95 -1.5 +1.5 VP-P
REFERENCE VOLTAGE
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APW7057
Electrical Characteristics (Cont.)
Unless otherwise specified, these specifications apply over VCC=5V, VBOOT=12V 0~70 Typical values TA=25oC. APW7057 Symbol Parameter Test Conditions Unit
CONTROLLER GATE DRIVERS UGATE Source UGATE Sink LGATE Source LGATE Sink IOCSET UVFB Dead Time OCSET Sink Current Under-Voltage Level Under-Voltage Hysteresis SOFT-START SHUTDOWN Soft-Start Interval Shutdown Threshold OCSET Shutdown Hysteresis VOCSET Falling 1.25 VOCSET=4.5V falling PROTECTION VUAGTE=1V VUGATE=1V VLGATE=1V VLGATE=1V
Functional Description
BOOT (Pin This provides bias voltage high-side MOSFET driver. Connect this +12V directly bootstrap circuit pump boot voltage enforcing driving capability gate driver improving performance MOSFET. UGATE (Pin Connect this gate high-side N-channel MOSFET. This provides gate drive high-side MOSFET. (Pin Signal power ground voltage levels measured with respect this pin. this ground plane through lowest impedance connection available.
Copyright ANPEC Electronics Corp. Rev. Jun., 2003 www.anpec.com.tw
LGATE (Pin Connect this gate low-side N-channel MOSFET. This provides gate drive low-side MOSFET. (Pin Connect this supply voltage. This provides bias control circuitry lowside MOSFET driver. voltage this monitored Power-On Reset (POR) purposes.
APW7057
Functional Description
(Pin This inverting input internal error amplifier. Connect this output (VOUT) converter external resistor divider provide feedback loop converter. output voltage resistor divider determined using following formula ROUT VOUT=0.8V RGND where ROUT resistor connected from VOUT RGND resistor connected from GND. OCSET (Pin Connect resistor (ROCSET) from this drain high-side MOSFET. This resistor, internal 40µA current source (IOCSET), MOSFET's onresistance (RDS(ON)) converter over-current trip point (IPEAK) according following formular IPEAK IOCSET ROCSET RDS(ON) PHASE (Pin Connect this source high-side MOSFET. This used monitor voltage drop across high-side MOSFET over-current protection.
over-current trip cycles soft-start function counts each over-current event. shuts down controller after counter reaches three times. Pulling holding this below 1.25V with open drain device shuts down Releasing OCSET initiates soft-start controller.
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
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APW7057
Typical Characteristics
Reference Voltage Junction Temperature
0.812
Switching Frequency Junction Temperature
Switching Frequency, FOSC (kHz)
Reference Voltage, VREF
0.808
0.804 0.800 0.796
0.792 0.788
Junction Temperature (oC)
Junction Temperature (°C)
OCSET Current Junction Temperature
OCSET Current IOCSET (µA)
Junction Temperature (oC)
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
www.anpec.com.tw
APW7057
Operating Waveforms
(Refer typical application circuit)
Load Transient Response IOUT IOUT slew rate 10A/µS IOUT
VOUT
IOUT
VOUT
IOUT
VOUT
VUGATE
VUGATE
IOUT
IOUT
IOUT VOUT, 100mV/Div, Offset 2.50V VUGATE, 10V/Div, IOUT, 5A/Div Time 10µS/Div 20MHz
VOUT, 100mV/Div, Offset 2.50V VUGATE, 10V/Div, IOUT, 5A/Div Time 10µS/Div 20MHz
VOUT, 100mV/Div, Offset 2.50V IOUT, 5A/Div Time 100µS/Div 20MHz
UGATE LGATE UGATE Rising
IOUT=10A VUGATE IOUT=10A VUGATE
UGATE Falling
VLGATE
VLGATE
VUGATE, 2V/Div, VLGATE, 2V/Div, Time 125nS/Div 500MHz
VUGATE, 2V/Div, VLGATE, 2V/Div, Time 125nS/Div 500MHz
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
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APW7057
Operating Waveforms (Cont.)
Powering Soft-start Powering
Powering
VOUT
VOUT
VIN, 2V/Div, VOUT, 1V/Div, Time 1mS/Div 20MHz
VIN, 2V/Div, VOUT, 1V/Div, Time 5mS/Div
Short-Circuit Protection Under-Voltage (UVP) Over-Current Protection (OCP)
VOUT
IOUT
VOUT, 1V/Div, IOUT, 10A/Div Time 1mS/Div 20MHz
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
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APW7057
Packaging Information
SOP-8 Reference JEDEC Registration MS-012)
0.004max.
Min.
0.015X45
Inche
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
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APW7057
Physical Specifications
Terminal Material Lead Solderability Packaging Solder-Plated Copper (Solder Material 90/10 63/37 SnPb Meets Specification RSI86-91, ANSI/J-STD-002 Category 2500 devices reel
(IR/Convection Reflow)
Reflow Condition
temperature
Reference JEDEC Standard J-STD-020A APRIL 1999
Peak temperature
183°C Pre-heat temperature
Time
Classification Reflow Profiles
Convection Convection °C/second max. seconds max. seconds seconds +5/-0 +5/-0 /second max. minutes max. /second max.
Average ramp-up rate(183 Peak) Preheat temperature Temperature maintained above Time within actual peak temperature Peak temperature range Ramp-down rate Time peak temperature
seconds 215~ +5/-0 /second max.
Package Reflow Conditions
pkg. thickness 2.5mm bags Convection +5/-0 215-219 IR/Convection +5/-0 pkg. thickness 2.5mm pkg. volume pkg. thickness 2.5mm pkg. volume Convection +5/-0 +5/-0 IR/Convection +5/-0
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
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APW7057
Reliability test program
Test item SOLDERABILITY HOLT Latch-Up Method MIL-STD-883D-2003 MIL-STD-883D-1005.7 JESD-22-B, A102 MIL-STD-883D-1011.9 MIL-STD-883D-3015.7 JESD Description 245°C 1000 Bias Hrs, 121°C -65°C 150°C, Cycles VHBM 2KV, 200V 10ms 100mA
Carrier Tape Reel Dimension
Application
330±1
12.75
12.4 +0.2
5.2±
1.75±
SOP-8
1.55±0.1 1.55+ 0.25
2.1± 0.3±0.013
(mm)
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
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APW7057
Cover Tape Dimensions
Application SOP- Carrier Width Cover Tape Width Devices Reel 2500
Customer Service
Anpec Electronics Corp. Head Office Li-Hsin Road, SBIP, Hsin-Chu, Taiwan, R.O.C. 886-3-5642000 886-3-5642050 Taipei Branch 137, Lane 235, Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, 886-2-89191368 886-2-89191369
Copyright ANPEC Electronics Corp. Rev. Jun., 2003
www.anpec.com.tw

8-PIN Single Synchronous Buck Controller Operating Voltage Single

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