ISL6414 ISL6411

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ISL6414 - ISL6414
ISL6411 - ISL6411

ISL6414 Enhanced ISL6411
April 2004 AN1080.2
Author: Manisha Pandya
Introduction
ISL6414 integrates three ultra noise, dropout linear regulators providing highly integrated single-chip solution 802.11 wireless chipset architectures. operates from 3.0V 3.8V input provides preset output voltages LDO1 1.8V, LDO2 LDO3 2.84V. device features power sequencing specifically wireless chipsets. outputs sequenced such that LDO1, 1.8V core regulator voltage, always within regulation before LDO2, 2.84V output LDO, sequenced When powering down, power 2.84V LDO2 removed before 1.8V LDO1 core regulator sequenced off. Designed with internal P-channel MOSFET pass transistor, ISL6414 operates with supply current. output fault detection circuit indicates loss regulation three outputs. Other features include logic controlled shutdown mode, short circuit thermal shutdown protection, reverse battery protection. ISL6414 also includes RESET function. Integration this function into ISL6414 eliminates additional RESET external support components required wireless chipset power supply applications. asserts RESET signal whenever (IN) supply voltage drops below preset threshold, keeping asserted least 100ms after (IN) risen above reset threshold. RESET outputs provided; RESET push-pull active-LOW output, while RESET active-HIGH output.
Quick Start Evaluation
evaluation board shipped "ready use" right from box. board accepts 3.3V input from standard power supply. output exercised through external load. There posts available board introducing power board drawing current from regulated outputs. Post connectors also available monitor power good conditions FAULT (P11), RESET (P9) RESET (P10). Posts Shutdown functions SHDN (P12) SHDN3 (P13) allows power mode function testing. Each evaluation board sent with samples ISL6414IR.
Recommended Test Equipment
test functionality ISL6414, following equipment recommended: adjustable capable bench power supply electronic load Four channel oscilloscope with probes Precision digital multimeter
Power Load Connections
Input Voltage Connect positive lead adjustable bench power supply 3.3V post (P3). Connect ground lead supply post (P4). Output Voltages ISL6414EVAL1 provides fixed output voltages Wireless Chipset applications. Internal trimmed resistor networks inside chip nominal output voltages below: VOUT1 1.8V (P5) VOUT2 2.84V (P7) VOUT3 2.84V (P1) outputs exercised through external load connectors. maximum currents VOUT1 500mA, VOUT2 300mA VOUT3 -200mA. Output Loading, Sourcing Current load VOUT1 output connect positive lead electronic load VOUT1 (P5) post return terminal same load channel (P6) post. Similarly connect positive terminal second load channel VOUT2 (P7) post return terminal (P8) post load output LDO2. LDO3 output loaded connecting positive terminal third channel electronic load VOUT3 (P1) post return terminal (P2) post.
Intersil (and design) registered trademark Intersil Americas Inc. Copyright Intersil Americas Inc. 2003. Rights Reserved other trademarks mentioned property their respective owners.
Applications
PRISM® PRISM GTTM, PRISM Chipsets WLAN Cards PCMCIA, Cardbus32, MiniPCI Cards Compact Flash Cards Hand-Held Instruments
ISL6414 Reference Design
TABLE ISL6414 EVALUATION BOARD BOARD NAME ISL6414EVAL1 PART NUMBER ISL6414IR PACKAGE 16-Ld
1-888-INTERSIL 321-724-7143
Application Note 1080
Evaluation Board Performance
ISL6414EVAL1 Evaluation board provides easy platform characterize performance
Output Performance
Figures below show transient response regulation LDO1, LDO2 LDO3.
VOUT 2.84V LOAD 50mA
OUTPUT VOLTAGE (mV)
OUTPUT VOLTAGE (mV) INPUT VOLTAGE
VOUT 1.8V LOAD 50mA
INPUT VOLTAGE
TIME (1ms/DIV)
TIME (1ms/DIV)
FIGURE LINE TRANSIENT RESPONSE (VOUT1)
FIGURE LINE TRANSIENT RESPONSE (VOUT2)
OUTPUT VOLTAGE (mV)
VOUT 2.84V LOAD 50mA
OUTPUT VOLTAGE DEVIATION (mV)
VOUT 1.8V 3.3V
INPUT VOLTAGE
LOAD CURRENT (mA) TIME (1ms/DIV)
TIME (2ms/DIV)
FIGURE LINE TRANSIENT RESPONSE (VOUT3)
FIGURE LOAD TRANSIENT RESPONSE (VOUT1)
OUTPUT VOLTAGE DEVIATION (mV)
OUTPUT VOLTAGE DEVIATION (mV)
VOUT 2.84V 3.3V
VOUT 2.84V 3.3V
LOAD CURRENT (mA)
LOAD CURRENT (mA) TIME (2ms/DIV)
TIME (2ms/DIV)
FIGURE LOAD TRANSIENT RESPONSE (VOUT2)
FIGURE LOAD TRANSIENT RESPONSE (VOUT3)
Application Note 1080
Dropout Voltage
ISL6414 features typical rDS(ON) P-channel MOSFET pass transistors. This provides several advantages over similar designs using bipolar pass transistors. P-Channel MOSFET requires base drive, which reduces quiescent current considerably. based regulators waste considerable current dropout when pass transistor saturates. They also high base drive currents under large loads. ISL6414 does suffer from these problems ultra drop-out regulators maintain 2.84V supplies within regulation with worst case minimum line input. Both LDO2 LDO3 supply full load with less then 3.0V input. Figure below shows dropout voltage output load current both LDO2 LDO3.
0.140 0.120 0.100 0.080 0.060 0.040 0.020 0.000 0.00 0.05 0.10 0.15 0.20 0.25 0.30 DROPOUT (mV) DROPOUT VOLTAGE (mV) TEMPERATURE (°C)
FIGURE LD02 DROPOUT VOLTAGE TEMPERATURE
FIGURE LD02 DROPOUT VOLTAGE
TEMPERATURE (°C)
FIGURE LD03 DROPOUT VOLTAGE TEMPERATURE
0.100 0.090 0.080 0.070 0.060 0.050 0.040 0.030 0.020 0.010 0.000 0.00 0.05 0.10 0.15 0.30
Current Limit
ISL6414 monitors controls pass transistor's gate voltage limit output current. current limit LDO1 550mA, LDO2 330mA LDO3 250mA. Performance over current event tested applying over load respective outputs. FAULT output will over current condition three LDO. ISL6414 based DC-DC converter fully protected from short circuit ground outputs current limit thermal protection features.
Integrated RESET MAC/ Baseband Processors
ISL6414 includes microprocessor supervisory circuit. This circuit eliminates extra RESET external components needed wireless chipset applications. This block performs single function; asserts RESET signal whenever supply voltage decreases below preset threshold 2.63V, keeping asserted programmable time (set external capacitor after voltage risen above RESET threshold.
FIGURE LD03 DROPOUT VOLTAGE
Application Note 1080
push pull output stage reset circuit provides both active-Low RESET (P10) active-HIGH RESET (P9) output. This function guaranteed correct state down addition issuing reset microprocessor during power-up, power down brownout conditions, this block relatively immune short duration, negative-going transients/glitches. Figure below shows relations between RESET timing capacitor programmable RESET delay.
Thermal Overload Protection
Thermal overload protection limits total power dissipation ISL6414. When junction temperature (TJ) exceeds +150°C, thermal sensor sends signal shutdown logic, turning pass transistor allowing cool. pass transistor turns again after IC's junction temperature cools 20°C, resulting pulsed output during continuous thermal overload conditions. Thermal overload protection protects ISL6414 against fault conditions. continuous operation, exceed absolute maximum junction temperature rating +150°C.
VOLTAGE
TIME (µs)
FIGURE SHUTDOWN RESET FAULT
Operating Region Power Dissipation
maximum power dissipation ISL6414 depends thermal resistance package circuit board, temperature difference between junction ambient air, rate flow. power dissipated device where IOUT1 (VIN VOUT1) IOUT2 (VIN VOUT2) IOUT3 (VIN- VOUT3) maximum allowed power dissipation PMAX (TJMAX TA)/JA Where TJMAX 150°C, ambient temperature, thermal resistance from junction surrounding environment.
Shutdown
Driving SHDN input (P12) puts both LDO1 LDO2 into shutdown mode. Driving SHDN3 (P13) input puts LDO3 shutdown mode. Pulling SHDN SHDN3 pins simultaneously, puts entire chip into shutdown mode, supply current drops typical. External pull resistors required because both SHDN SHDN3 inputs have internal pull-up resistors, that normal operation outputs always enabled. During shutdown mode using SHDN pin, FAULT output will remain HIGH (refer Figure 11).
Fault-Detection Circuitry
FAULT monitors LDO1 output regulation, well fault conditions such current limit thermal shutdown. FAULT output goes LOW, LDO1 output regulation ±5.5% (typ.). During shutdown mode using SHDN pin, FAULT output will remain HIGH (refer Figure 11).
References
Intersil documents available web, http://www.intersil.com/ ISL6414 Data Sheet, Intersil Corporation, File FN9128.
Application Note 1080 ISL6414EVAL1 Schematic
FAULT 100K 10µF +3.3V
RESET RESET
VOUT1 +1.8V
RESET
FAULT
0.01µF
OUT3 GND3
SHDN SHDN3 VOUT3 +2.84V
RESET ISL6414 SHDN SHDN3
OUT1 OUT2 0.033µF
4.7µF
0.033µF 4.7µF
VOUT2 +2.84V
4.7µF 0.033µF
ISL6414EVAL1 Bill Materials
ITEM REFERENCE PART NUMBER ISL6414IR PART TYPE Linear, Multi-Output DESCRIPTION Regulator, Drop PACKAGE 16-Lead VENDOR Intersil
CAPACITORS C10, (DNP) 1210ZC106MAT2A 1210ZC475MAT2A Capacitor, Ceramic, 10µF, 20%, Capacitor, Ceramic, 4.7µF, 20%, Capacitor, Ceramic, SM_1210 SM_1210 SM_1210 AVX/Panasonic AVX/Panasonic AVX/Panasonic
0603ZC103KAT2A 0603ZC333JAT2A
Capacitor, Ceramic, 0.01µF, 10%, Capacitor, Ceramic, 0.033µF,
SM_0603 SM_0603
AVX/Panasonic AVX/Panasonic
RESISTORS Resistor, Film 100k, 0.1W SM_0603 Panasonic
OTHERS 1514-2 Turrett Post Terminal post, throughhole, inch tall Keystone
Application Note 1080 ISL6414EVAL1 Evaluation Board Layout
ISL6414EVAL1
FIGURE ISL6414EVAL1 LAYER SILK SCREEN
FIGURE ISL6414EVAL1 LAYER
Application Note 1080 ISL6414EVAL1 Evaluation Board Layout (Continued)
FIGURE ISL6414EVAL1 LAYER (GROUND)
FIGURE ISL6414EVAL1 LAYER (POWER)
Application Note 1080 ISL6414EVAL1 Evaluation Board Layout (Continued)
FIGURE ISL6414EVAL1 LAYER (BOTTOM)
FIGURE ISL6414EVAL1 BOTTOM LAYER SILK SCREEN
Intersil U.S. products manufactured, assembled tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications viewed www.intersil.com/design/quality
Intersil products sold description only. Intersil Corporation reserves right make changes circuit design, software and/or specifications time without notice. Accordingly, reader cautioned verify that data sheets current before placing orders. Information furnished Intersil believed accurate reliable. However, responsibility assumed Intersil subsidiaries use; infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Intersil subsidiaries.
information regarding Intersil Corporation products, www.intersil.com

ISL6414 ISL6411

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