8-PIN Synchronous Buck Controller Operating with Single Input Dri
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APW7037/A
8-PIN Synchronous Buck Controller
Operating with Single Input Drives N-Channel MOSFETs Simple Single-Loop Control Design
General Description
APW7037/A controller designed provide cost synchronous Buck regulator on-board converter applications. APW7037 together with dual N-channel MOSFETs such APM7313, provide cost solution such applications. This device features internal 200KHz oscillator (400KHz version), Power-On-Reset (POR) both supplies, external programmable soft-start function well output under-voltage detection that latches device when output short detected.
Voltage-Mode Control Full 100% Duty Ratio Fast Transient Response Output Voltage Accuracy Over Temperature Under-Voltage Protection Output 200kHz Constant Frequency Operation
(400kHz APW7037A)
Small size, 8-PIN Package (SOIC TSSOP)
Description
LDRV COMP HDRV
Applications
Graphics Cards Memory Power Supply Memory Termination Voltage Low-Voltage Distributed Power Supplies
Ordering Marking Information
7037/A
andling ange ackage ackage perating Junction ange 70°C andling
7037/A
7037/A XXXXX
7037/A
7037/A XXXXX
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. May, 2003 www.anpec.com.tw
APW7037/A
Block Diagram
20uA 4.5V 3.3V 64uA Regulator
HDRV
Under-V oltage Gate Control
Error FOSC
LDRV
Absolute Maximum Ratings
Description Operating Junction Temperature Storage Temperature Soldering Temperature Seconds) Minimum Rating Rating -0.2~30 -0.2~30 0~125 -65~150 Unit
Thermal Characteristics
Symbol Parameter Thermal Resistance Free 8-pin SOIC 8-pin TSSOP Value Unit °C/W
Copyright ANPEC Electronics Corp. Rev. May, 2003
www.anpec.com.tw
APW7037/A
Electrical Characteristics
Unless otherwise specified, these specifications apply over VCC=5V, VC=12V TA=0 70°C. Typical values refer TA=25°C.
APW7037/A Symbol ICCQ Parameter Test Conditions Min. Typ. 0.25 APW7037 APW7037A 1.10 SS=3V, VFB=1V SS=0V, VFB=1V Max. SUPPLY CURRENT Dynamic Supply Current FOSC=200KHz, CL=1500pF Dynamic Supply Current Static Supply Current Static Supply Current Rising Threshold Hysteresis Rising Threshold Hysteresis OSCILLATOR FOSC VOSC IFB1 IFB2 Free Running Frequency Ramp Amplitude Input Bias Current Input Bias Current Transconductance OSC=200KHz, CL=1500pF SS=GND SS=GND
Unit
POWER-ON RESET
µmho
ERROR AMPLIFIER
REFERENCE VOLTAGE LREG Regulation Voltage Line Regulation HDRV Rising Time HDRV Falling Time LDRV Rising Time LDRV Falling Time Dead Band Time PROTECTION VFBUV Under-Voltage Threshold Falling APW7037 APW7037A Shutdown Threshold Voltage Pull voltage Soft-Start Current SS=0 5~12V 1500pF 1500pF 1500pF 1500pF APW7037 1.225 1.250 1.275 APW7037A 0.784 0.800 0.816 0.35
GATE DRIVERS
Copyright ANPEC Electronics Corp. Rev. May, 2003
www.anpec.com.tw
APW7037/A
Functional Description
(Pin Connect this output (VOUT) converter external resistor divider provide voltage feedback path converter. output voltage resistor divider determined using following formula VOUT VREF
HDRV (Pin Connect this gate high-side power MOSFET. This provides gate drive MOSFET. (Pin This provides bias voltage high-side MOSFET driver. bootstrap circuit used pump boot voltage enforcing driving capability gate driver improving performance MOSFET. COMP (Pin This output error amplifier. external resistor-capacitor network provide loop compensation converter. (Pin Connect capacitor from this ground.This capacitor, along with internal 20uA current source, sets soft-start interval converter prevents outputs from overshoot well limits input current. Pull this below 0.5V shutdown converter.
where ROUT resistor connected from VOUT RGND resistor connected from ground. voltage this also monitored UnderVoltage protection. (Pin Connect this input voltage from 20V. This provides bias control circuitry low-side power MOSFET driver (LDRV). voltage this monitored Power-On Reset (POR) purpose. LDRV (Pin Connect this gate low-side power MOSFET. This provides gate drive MOSFET. (Pin Signal power ground voltage levels measured with respect this pin.
Copyright ANPEC Electronics Corp. Rev. May, 2003
www.anpec.com.tw
APW7037/A
Typical Applications
Dual supply voltage(5V 12V) application
100uF
47uF
2300A 0.1uF
7037
HDRV
7313
3.3uH 1.5V
Shutdown
LDRV
7313 1.24k
C6,C9 150uF
2200pF
Single supply voltage(5V) application
1N4148
1N4148
1N4148
0.1uF
100uF
47uF
2300A 0.1uF
Shutdown
7037
HDRV
7312
3.3uH 1.5V
LDRV
7312 1.24k
C7,C10 150uF
2200pF
Copyright ANPEC Electronics Corp. Rev. May, 2003
www.anpec.com.tw
APW7037/A
Typical Applications (Cont.)
Monitor Application Circuit
2N3904 Circ pplic ation
1N4148
0.1uF
L431
1N4148 0.1uF
470uF
47uF
0.1uF
7037
HDRV
7313
50uH 0.2~
LDRV
7313
C7,C10 470uF
2200pF
Copyright ANPEC Electronics Corp. Rev. May, 2003
www.anpec.com.tw
APW7037/A
Package Information
SOP-8 Reference JEDEC Registration MS-012)
0.004max.
Min.
0.015X45
Inche
Copyright ANPEC Electronics Corp. Rev. May, 2003
www.anpec.com.tw
APW7037/A
Package Information
TSSOP-8
GAUGE PLANE
0.25
(L1)
Millimeters Min. 0.00 0.80 0.19 4.30 0.45 0.09 0.09 0.65 6.40 Max. 0.15 1.05 0.30 4.50 0.75 Min. 0.000 0.031 0.007 0.114 0.169 0.018 0.004 0.004 0.008
Inches Max. 0.047 0.006 0.041 0.012 0.122 0.026 0.252 0.039REF 0.177 0.030
Copyright ANPEC Electronics Corp. Rev. May, 2003
www.anpec.com.tw
APW7037/A
Physical Specifications
Terminal Material Lead Solderability Solder-Plated Copper (Solder Material 90/10 63/37 SnPb) Meets Specification RSI86-91, ANSI/J-STD-002 Category
Reflow Condition
(IR/Convection Reflow)
temperature
Peak temperature
183°C Pre-heat temperature
Time
Classification Reflow Profiles
Convection Convection Average ramp-up rate(183°C Peak) 3°C/second max. seconds Preheat temperature 25°C) seconds Temperature maintained above 183°C seconds Time within actual peak temperature Peak temperature range +5/-0°C +5/-0°C Ramp-down rate /second max. minutes max. Time 25°C peak temperature /second max.
seconds 215-219°C +5/-0°C /second max.
Package Reflow Conditions
pkg. thickness 2.5mm bgas 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
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Copyright ANPEC Electronics Corp. Rev. May, 2003
APW7037/A
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 Dimensions
Application
330±1
SOP-8
12.75 +0.15
12.4 +0.2 12.4
5.2±
2.1±
1.75± 0.3±0.013 1.75±0.1
1.55 ±+0.1 1.55+0.25 Application TSSOP-8 +1.5 12.75+ 0.15
0.3±0.013
(mm)
Copyright ANPEC Electronics Corp. Rev. May, 2003 www.anpec.com.tw
APW7037/A
Cover Tape Dimensions
Application SOP- TSSOP- Carrier Width Cover Tape Width Devices Reel 2500 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. May, 2003
www.anpec.com.tw
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