Efficiency. Start-Up Voltage: 0.8V Internal Synchronous Rectifier 100K

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Efficiency. Start-Up Voltage: 0.8V Internal Synchronous Rectifier 100K

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PS0020 Synchronous Boost Converter with Output Disconnect
Efficiency. Start-Up Voltage: 0.8V Internal Synchronous Rectifier 100KHz Switching Allows Tiny External Components 2.5V Output Range (Note Fully Discharged Shutdown Output Voltage Logic Controlled Shutdown (<1A) Pulse Skipping Light Load Extended Battery Life Generates 3.3V 20mA from Single Cell Stable with Ceramic Output Capacitor SOT-26 Package
PS0020 synchronous, step-up DC/DC converter delivering high efficiency 6-leads SOT-26 package. device having internal NMOS switch PMOS synchronous rectifier capacity supplying 3.3V 20mA from single cell input. high frequency switching minimizes board area allowing tiny, profile inductors ceramic capacitors. PS0020 provides automatic pulse skipping light loads reducing supply current extended battery life. shutdown PS0020 fully discharges output ground takes very supply current. PS0020 available small SOT26 package with both fixed adjustable output voltage versions.
APPLICATIONS
players PDAs Organizers Digital Cameras Wireless Mice Keyboards Portable Medical Equipments Receivers Remote controls Wireless Headsets
TYPICAL APPLICATION
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PS0020
MARKING DIAGRAMS
PS0020 Adjustable/fixed voltage version, refer ordering information Mask Version Week code A~Z=W1~W26 A~Z=W27~W52 Lead Free Package
CONFIGURATION
Name
SHUTB VOUT
Type
Switch Ground Feedback Shutdown input. Analog output. Battery input.
Function
Connect inductor between Vin. Ground Adjustable feedback input, connect resistor voltage divider. SHUTB=High: normal operation. (Supports both CMOS Logic). Boost regulator output. Boost regulator input.
ORDERING INFORMATION
Part Number
PS0020A PS0020 PS0020 PS0020 PS0020
Voltage
Adj.
Marking
Junction Temp. Range
-40°C -40°C -40°C -40°C -40°C 85°C 85°C 85°C 85°C 85°C
Package
SOT-26 SOT-26 SOT-26 SOT-26 SOT-26
Note Contact factory other output voltages that above table
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PS0020
BLOCK DIAGRAM
Discharge Switch Body Manage Switch VOUT
Current Sense Amplifier
Bias Select
Bias Circuitry
Zero-Current
Thermal Sensor Program Voltage Gate Control Logic
ZeroCrossing Comparator
Fixed
Over-Current Limiter
Time Control Logic Start-up Oscillator UVLOB Under Voltage Lockout REFERENCE Minimum TOFF
SHUTB Shut-Down Circuitry
Shut Down
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PS0020
ABSOLUTE MAXIMUM RATINGS
Symbol
VSHUT VOUT ISW, IOUT, IGND TSTG
Parameter
Supply Voltage Voltage Voltage Pulsed (<100nS) SHUTB Voltage Voltage Output Voltage Switch Current Storage Temperature Range Thermal Resistance, Junction-To-Air Operating Temperature Range (Note Lead Temperature (Soldering, 10sec) Capability, model
Value
-0.3V -0.3V -0.3V -0.3V -0.3V -0.3V +125
Unit
°c/w
ELECTRICAL CHARACTERISTICS
Parameter
start-up Voltage Operating Voltage Maximum Input Operating Voltage Output Voltage Adjust Range Feedback Voltage Feedback Input Current Load Regulation Quiescent Current (No-switching) Quiescent Current (Shut-down) NMOS Switch Resistance PMOS Switch Resistance NMOS Current Limit PMOS Turn-Off Current Current Limit Delay Output Minimum Off-Time Maximum On-Time Maximum On-Time Minimum OffTime Ratio
25°C. 1.5V, VOUT 3.3V, VSHUTB 1.5V (unless otherwise noted). Conditions
load Note Note Note -40°C 85°C (Note 1.2V ILOAD 20mA 1.2V, Measured VOUT VSHUTB VOUT Including Switch Leakage VOUT 3.3V VOUT 3.3V
0.95
Unit
0.95
0.01 0.45
1.05
0.5V 0.95V, 0.5V, -40°C 85°C (Note
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PS0020
ELECTRICAL CHARACTERISTICS continued
25°C. 1.5V, VOUT 3.3V, VSHUTB 1.5V (UNLESS OTHERWISE NOTED). Parameter
SHUTB Input High SHUTB Input SHUTB Input Current Frequency Start-up Thermal Shutdown
Conditions
0.95
Unit
0.35 15°C Hysteresis
Note Minimum operating input voltage fixed battery's ability provide necessary power that (terminal) voltage. Below this voltage, battery fails deliver required power enters into deeply discharged state. This voltage lower required duty cycle less. Note When input voltage greater than output voltage regulation point, part track mode (see Track Mode). Note applications where VOUT 4.3V, external Schottky diode required. Note Limits 100% production tested 25°C. Limits over operating temperature range guaranteed design.
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PS0020
TYPICAL OPERATING CHARACTERISTICS
(VIN 1.5V, Circuit Typical Application Circuit, +25°C, unless otherwise noted.)
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PS0020
OPERATION PS0020 compact, high-efficiency, synchronous boost converter 6-leads SOT-26 package designed space-restricted applications. parts available with adjustable output voltages ranging from 2.5V 5.0V. They able start with input voltages 0.8V operate with input voltages down 0.5V. With internal synchronous rectifier on-resistance internal NMOS switch, devices maintain high efficiency over wide range load current. shown Block Diagram, PS0020 consists accurate band core, error amplifier, start-up oscillator control logic unit along with PMOS NMOS switches. With current mode control, PS0020 ultra-fast line improved load regulation. Moreover, PS0020 provides real shutdown circuitry, which disconnects output from input shutdown results discharge output ground. Start-Up Mode: PS0020 will start typically 0.8V. When turned-on, device gets start bias from Vin. start-up oscillator, which runs typically KHz, brings output voltage high enough that Vout exceeds Vin. Once Vout exceeds Vin, internal bias switches from Vout internal biasselect circuit. Thus, once started (i.e. Vout exceeds Vin), internal circuit bias completely independent Vin. start-up oscillator runs duty cycle around 100KHz. Once Vout exceeds (typically 1.9V), start-up oscillator disabled normal fixed operation takes over. Internal PMOS NMOS switches PS0020 features 0.45 NMOS switch PMOS switch. normal operation these switches alternatively turned-on thus initiate charging inductor from then discharging output capacitor load. However, between event switch turning-off other turning-on, dead time provided avoid huge in-rush current from output ground switches. dead time, both switches remain inductor discharges body diode PMOS switch output. True Shutdown Mode PS0020 designed allow true shutdown managing body diode PMOS switch. PMOS switch turned there conductive path through body PMOS, output allowed zero during shutdown, drawing zero current from input. Output Voltage Selection PS0020A features user-adjustable output through external feedback network. voltage divider from Vout ground programs output voltage from 2.5V using following equation: Vout=Vref*[1+(R1/R2)] Where, Vref=1V Thermal Overload Protection Thermal-overload protection limits total power dissipation PS0020. When junction temperature exceeds +145°C, thermal sensor signals shutdown logic turns most internal circuitry. thermal sensor turns internal circuitry again after IC's junction temperature drops 15°C. Thermal-Overload protection designed protect PS0020 event fault condition. continual operation, exceed absolute maximum junction temperature rating +125°C. Current Limit Short Circuit Protection PS0020 includes current limiter that monitors peak inductor current through NMOS switch turns NOMS switch when inductor peak current exceeds 300mA. Because true shutdown feature, allowed shortcircuited. thermal shutdown turns regulator case excessive heating, when temperature reaches 145°C.
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PS0020
Light Load Operation PS0020 provides improved light load efficiency. internal zero current comparator monitors inductor current load shuts PMOS switch once this current reduces some value (50mA, typically). This prevents inductor current from reversing polarity, avoiding backcharging thus improving efficiency light load. that time, both NMOS PMOS switches remain off. However, normal operation starts again when output voltage falls below regulation point. automatically skips pulses light load, providing better efficiency. Anti-ringing Control When inductor current goes zero, there arises high frequency ringing pin. prevent this phenomenon, discharge switch provided between VIN, that this high frequency ringing damped out. Under Voltage Lockout When supply goes (below 1.8V typ), PS0020 produces internal UVLO (under voltage lockout) signal that disables normal operation enables start-up oscillator fixed frequency. that time, very circuits operational. When oscillator raises supply above 1.9V, UVLO signal disabled normal mode takes over start-up oscillator operation. This mechanism protects chip from producing false logic input supply.
Enable Input PS0020 features active-high CMOS input enable (SHUTB) that allows on/off control regulator. When SHUTB=Low, shutdown chip occurs that time almost quiescent current (<1A) flows. Output capacitor completely discharged through load feedback resistors real output shut down. discharge switch internally connected between Enable (SHUTB) input threshold TTL/CMOS compatible. Connect SHUTB normal operation. Track Mode PS0020 track mode when greater than output voltage regulation point abnormal boost converter operation). track mode, regulator runs fixed start-up oscillator frequency. start-up oscillator runs freely until Vout exceeds Vin. When Vout falls below Vin, start-up oscillator enabled again. Thus track mode, normal loop control operation remains off, rather regulator runs intermittent oscillator operation.
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PS0020
PACKAGE INFORMATION
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PS0020
DISCLAIMERS
LIFE SUPPORT Power IC's products designed used components devices intended support sustain human life. Power IC's products components intended surgical implant into body, other applications which failure Power IC's products could create situation where personal death injury occur, authorized without express written approval Power IC's Chief Executive Officer. Power will held liable damages claims resulting from products medical applications. MILITARY Power IC's products designed military applications. Power IC's products military applications authorized without express written approval Power IC's Chief Executive Officer. Power will held liable damages claims resulting from products military applications. RIGHT MAKE CHANGES Power reserves right change this document and/or this product without notice. Customers advised consult their Power sales representative before ordering.
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Efficiency. Start-Up Voltage: 0.8V Internal Synchronous Rectifier 100K

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