Input High Efficiency Synchronous Step-Up DC-DC Converter 0.95V T

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Input High Efficiency Synchronous Step-Up DC-DC Converter 0.95V T

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ACT6305
Input High Efficiency Synchronous Step-Up DC-DC Converter
0.95V Typical Startup Voltage Efficiency Fully Integrated Power Stage Fixed 3.3V Adjustable Output Voltage NanoStandbyShutdown Mode Tiny 23-5 Package
GENERAL DESCRIPTION
ACT6305 high-efficiency synchronous step-up DC-DC converter that consumes just 17µA quiescent supply current capable delivering more than 400mA output current using only three external components. This device achieves typical startup voltage just 0.95V, making this device ideal applications operating from alkaline cells. This device incorporates internal synchronous rectifier, achieves excellent peak efficiencies features proprietary control scheme that ensures high efficiency over wide load current range. ACT6305 voltages 3.3V externally ACT6305 Package. features pin-selectable output also voltage between available tiny SOT23-5
APPLICATIONS
Hand-Held Devices Three Cell Battery Operated Devices PDAs Cellular Phones Digital Cameras
4.7-6.8µH
22µF Ceramic
4.7- 10µF Ceramic
VOUT=
Figure Typical Application Circuit
Active-Semi, Inc.
www.active-semi.com
ACT6305
ORDERING INFORMATION
PART NUMBER ACT6305UC TEMPERATURE RANGE -40° PACKAGE SOT23-5 PINS MARK HBCA
CONFIGURATION
ACT6305
SOT23-5
DESCRIPTION
NUMBER NAME DESCRIPTION Output Voltage Selected Feedback Input. Connect select VOUT Connect select VOUT 3.3V. Connect resistor divider output voltage between Ground. Shutdown Input. Drive logic high normal operation, drive logic disable regulator. Inductor Connection Output. ACT6305 regulates voltage this pin. also provides power
Active-Semi, Inc.
www.active-semi.com
ACT6305
ABSOLUTE MAXIMUM RATINGS
(Note: Exceeding these limits damage device. Exposure absolute maximum rating conditions long periods affect device reliability.) PARAMETER VALUE UNIT
OUT, Continuous Current Maximum Power Dissipation (derate 5mW/°C above 50°C) Junction Ambient Thermal Resistance Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, sec)
-0.3 -0.3 VOUT Internally Limited 0.53
°C/W
ELECTRICAL CHARACTERISTICS
(Circuit Figure 1.5V, VOUT 3.3V, 25°C unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS UNIT
Minimum Operating Input Voltage Startup Voltage Output Voltage Startup Normal Transition Voltage Threshold Feedback Voltage Input Current Power Switch Current Limit Power Switch Resistance Synchronous Rectifier Resistance Leakage Current Output Voltage Range Quiescent Current Shutdown Supply Current Maximum Time Programming High Time Finish High Time Timeout Input Current VOUT 4.85
0.95 1.85
5.15
ILIM RONN RONP
VOUT 1.3V 100mA 100mA SHDN 3.3V External Feedback divider 1.3V SHDN VOUT 5.5V
1.16
1.18 0.15 0.25
tONMAX
tFINISH tOFF
Active-Semi, Inc.
www.active-semi.com
ACT6305
Figure Functional Block Diagram
FUNCTIONAL DESCRIPTION
ACT6305 comprises reference, feedback select error comparator, control logic timers, internal power MOSFETs current comparators. Functional Block Diagram shown Figure
voltage.
LIGHT LOAD OPERATION
Under light load conditions, automatically enters power-saving mode extending time. This reduces switching losses allows ACT6305 maintain high efficiency across very wide load range.
MAIN CONTROL LOOP
ACT6305 control architecture utilizes series one-shot current sense circuits regulate output voltage with very quiescent supply current just 17µA. cycle begins when falls below ACT6305's internal reference voltage. During cycle, N-channel power switch turned connect node ground, transferring energy from input supply inductor. cycle persists until either maximum time exceeded current limit reached. When either these conditions occur, N-channel power switch turns cycle begins. During cycle, energy stored inductor released into output capacitor load through synchronous rectifier. Once minimum time expires, another cycle begins when voltage drops below reference
VOLTAGE START
ACT6305 uses proprietary start-up circuitry that allows achieve very voltage startup down 0.95V. ACT6305 remains low-voltage startup mode until VOUT exceeds 1.85V. ACT6305 cannot support it's full rated load current when operating low-voltage startup mode, care should taken minimize load current during startup.
SHUTDOWN
shutdown mode, internal circuits including power switch synchronous rectifier disabled, reducing quiescent supply current less than 1µA. Note that shutdown mode path from input supply output still exists body diode synchronous rectifier.
Active-Semi, Inc.
www.active-semi.com
ACT6305
APPLICATION INFORMATION
OUTPUT VOLTAGE SELECTION
ACT6305 uses proprietary circuitry that enables provide three different output voltage options; ATC6305 provides fixed output voltage options 3.3V adjusted over 1.2V range connecting external resistive voltage divider. shown Figure connected resistive divider VOUT 3.3V VOUT VOUT 1.18V (1+R1/R2) output capacitor value should range 22µF 100µF. obtain small output ripple, large capacitor with ESR; ceramic capacitors should used highest performance. tantalum capacitor used, choose only types smaller low-ESR capacitor about connected parallel filter high frequency noise.
INDUCTOR SELECTION
most applications, inductor value should range 10µH 47µH. Smaller inductors provide faster load transient response have smaller physical size, they also result higher ripple current reduce maximum available output current. Choose inductors with series resistance obtain highest efficiency.
BOARD LAYOUT
reduce noise increase efficiency, high current traces should wide direct, extended ground plane should used. Switching current paths should laid tightly possible, with inductor input output capacitors located close order reduce electromagnetic radiation.
Figure
OUTPUT CAPACITOR SELECTION
minimum value capacitance required maintain loop stability normal operation
external resistor divider used, place resistors very close pins, keep them away from high switching current paths.
Active-Semi, Inc.
www.active-semi.com
ACT6305
TYPICAL PERFORMANCE CHARACTERISTICS
Active-Semi, Inc.
www.active-semi.com
ACT6305
TYPICAL PERFORMANCE CHARACTERISTICS CONT'D
Title
Active-Semi, Inc.
www.active-semi.com
ACT6305
TYPICAL PERFORMANCE CHARACTERISTICS CONT'D
Mode Connection Output Capacitor VOUT(50mV/Div)
VOUT VVOUT 3.3V 3.3V VVIN 1.2V 1.2V ILOAD 10mA 10mA
LOAD
Current Limit Condition Output Capacitor VOUT (100mV/Div)
VOUT VOUTOUT 3.3V 3.3V VINVIN 2.4V 2.4V ILOAD 408mA ILOAD 408mA
V(LX)
V(LX)
V(LX) (2V/Div) Time: 5µs/Div
V(LX) (2V/Div) Time: 2.5µs/Div
Heavy Load Condition Output Capacitor VOUT(100mV/Div)
VOUT VOUT 5.2V 3.6V ILOAD 400mA V(LX)
Mode Connection High Output Capacitor VOUT(100mV/Div)
VOUT
VOUT 3.3V 2.4V ILOAD 112mA
V(LX)
V(LX) (2V/Div) Time: 2.5µs/Div
V(LX) (2V/Div) Time: 25µs/Div
Heavy Load Condition High Output Capacitor VOUT(100mV/Div)
VOUT VOUT 3.3V 2.4V ILOAD 340mA
V(LX)
V(LX) (2V/Div) Time: 5µs/Div
Active-Semi, Inc.
www.active-semi.com
ACT6305
SOT23-5 PACKAGE OUTLINE DIMENSIONS
DIMENSION MILLIMETERS 1.050 1.250 0.000 0.100 1.050 1.150 0.300 0.400 0.100 0.200 2.820 3.020 1.500 1.700 2.650 2.950 0.950 1.800 2.000 0.700 0.300 0.600 DIMENSION INCHES 0.041 0.049 0.000 0.004 0.041 0.045 0.012 0.016 0.004 0.008 0.111 0.119 0.059 0.067 0.104 0.116 0.037 0.071 0.079 0.028 0.012 0.024
SYMBOL
Active-Semi, Inc. reserves right modify circuitry specifications without notice. Users should evaluate each product make sure that suitable their applications. Active-Semi products intended authorized critical components life-support devices systems. Active-Semi, Inc. does assume liability arising product circuit described this data sheet, does convey patent license. Active-Semi logo trademarks Active-Semi, Inc. more information this other products, contact sales@active-semi.com visit www.active-semi.com. other inquiries, please send 1270 Oakmead Parkway, Suite 310, Sunnyvale, California 94085-4044,
Active-Semi, Inc.
www.active-semi.com

Input High Efficiency Synchronous Step-Up DC-DC Converter 0.95V T

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