efficiency start-up voltage 0.8V Internal synchronous rectifier 2MHz s

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efficiency start-up voltage 0.8V Internal synchronous rectifier 2MHz s

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PS0100 600mA Synchronous Boost Converter with Output Disconnect
efficiency start-up voltage 0.8V Internal synchronous rectifier 2MHz switching allows tiny external components 0.5V 4.4V input range 2.5V 5.0V output range (Note Fully discharged shutdown output voltage Logic controlled shutdown (<1µA) 250µA operating supply current (measured VOUT) Pulse skipping light load extended battery life Generates 3.3V 100mA from single cell Stable with ceramic output capacitor profile 6-Leads SOT-26 package players PDAs organizers Digital cameras Wireless mice/ keyboards Portable medical equipment Cordless phones Wireless Headsets
PS0100 synchronous, step-up DC/DC converter delivering high efficiency SOT-26 package. device internal NMOS switch PMOS synchronous rectifier capacity supplying 3.3V 100mA from single cell input. High frequency switching 2MHz) minimizes board area allowing tiny, profile inductors ceramic capacitors. PS0100 provides automatic pulse skipping light loads, thus reducing supply current extended battery life. shutdown, PS0100 fully discharges output ground draws supply current. PS0100 available small SOT-26 package with both fixed adjustable output voltage versions.
DESCRIPTION
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
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PS0100
CONFIGURATION
DESIGNATOR
Name SHUTB VOUT Type Switch Ground Feedback Shutdown input Analog output Battery input Function Connects inductor between Ground Adjustable feedback input, connects resistor voltage divider SHUTB High: normal operation (Supports both CMOS logic) Boost regulator output Boost regulator input
ORDERING INFORMATION
Part Number PS0100A PS0100 PS0100 PS0100 PS0100 Voltage Adj. Junction Temperature Range -40°C 85°C -40°C 85°C -40°C 85°C -40°C 85°C -40°C 85°C Package SOT-26 SOT-26 SOT-26 SOT-26 SOT-26
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PS0100
BLOCK DIAGRAM
Discharge Switch Body Manage Switch VOUT Current Sense Amplifier
Bias Select
Bias Circuitry
Zero-Current
Thermal Sensor Program Voltage
Zero Crossing Comparator
Gate Control Logic Fixed
Over-Current Limiter Start-up Oscillator UVLOB Under Voltage Lockout REFERENCE
Time Control Logic
Minimum TOFF
SHUTB
Shut-Down Circuitry
Shut Down
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PS0100
ABSOLUTE MAXIMUM RATINGS
Symbol VSHUTB 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 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 +125 Unit °C/W
ELECTRICAL CHARACTERISTICS
(All specifications 25°C, 1.5V, VOUT 3.3V, VSHUTB 1.5V, unless otherwise specified.) Parameter Minimum Start-Up Voltage Minimum 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 Off-Time Ratio Conditions load Note Note Note -40°C 85°C (Note 1.2V ILOAD 10mA 100mA 1.2V, measured VOUT VSHUTB VOUT including switch leakage VOUT 3.3V VOUT 3.3V 0.13 0.95 0.95 Unit
0.97
0.01 0.45
1.03
0.5V 0.95V, 0.5V, -40°C 85°C (Note
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PS0100
ELECTRICAL CHARACTERISTICS (continued)
(All specifications 25°C, 1.5V, VOUT 3.3V, VSHUTB 1.5V, unless otherwise specified.) Parameter SHUTB Input High SHUTB Input SHUTB Input Current Frequency Start-Up Thermal Shutdown Conditions 0.95 Type 0.35 15°C Hysteresis Unit
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 operates track mode (see Track Mode). Note applications where VOUT 4.3V, external Schottky diode recommended. Note Limits 100% production tested TA=25°C. Specifications over -40°C +85°C operating temperature range assured design.
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PS0100
TYPICAL OPERATING CHARACTERISTICS
(All specifications =+25°C, 1.5V, circuit typical application circuit, unless otherwise specified.)
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PS0100
TYPICAL OPERATING CHARACTERISTICS (continued)
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PS0100
TYPICAL OPERATING CHARACTERISTICS (continued)
July 2007
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PS0100
TYPICAL OPERATING CHARACTERISTICS (continued)
July 2007
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PS0100
OPERATION
PS0100 compact, high-efficiency, synchronous boost converter SOT-26 package designed spacerestricted applications. part available with adjustable output voltages ranging from 2.5V 5.0V. able start with input voltages 0.8V operate with input voltages down 0.5V. With internal synchronous rectifier on-resistance internal NMOS switch, device maintains high efficiency over wide range load current. shown Block Diagram, PS0100 consists accurate band core, error amplifier, start-up oscillator control logic unit along with PMOS NMOS switches. With current mode control, PS0100 ultra-fast line improved load regulation. Moreover, PS0100 provides real shutdown circuitry which disconnects output from input during shutdown results discharge output ground. conductive path through body PMOS, output allowed zero during shutdown, drawing zero current from input.
Output Voltage Selection
PS0100 features user-adjustable output through external feedback network. voltage divider from VOUT ground programs output voltage from 2.5V using following equation: VOUT VREF (R1/R2)] where, VREF 1.0V
PS0100 starts typically 0.8V. When turned device gets start bias from VIN. start-up oscillator, which runs typically KHz, takes output voltage high enough that VOUT exceeds VIN. Once VOUT exceeds VIN, internal bias switches from VOUT internal bias-select circuit. Thus, once started (i.e. VOUT exceeds VIN), internal circuit bias completely independent VIN. start-up oscillator runs duty cycle around 650KHz. Once VOUT exceeds (typically 1.9V), start-up oscillator disabled normal fixed operation takes over.
Start-Up Mode
Thermal overload protection limits total power dissipation PS0100. 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 PS0100 event fault condition. continuous operation, exceed absolute maximum junction temperature rating +125°C.
Thermal Overload Protection
Current Limit Short Circuit Protection
Internal PMOS NMOS Switches
PS0100 features 0.45 NMOS switch PMOS switch. normal operation, these switches alternatively turned thus initiate charging inductor from then discharging output capacitor load. However, between event switch turning other turning dead time provided avoid huge in-rush current from output ground switches. During dead time, both switches remain inductor discharges body diode PMOS switch output.
PS0100 includes current limiter that monitors peak inductor current through NMOS switch turns NMOS switch when inductor peak current exceeds 850mA. Because true shutdown feature, allowed short-circuited. thermal shutdown turns regulator event excessive heating when temperature reaches 145°C.
Light Load Operation
PS0100 provides improved light load efficiency. internal zero current comparator monitors inductor current load shuts PMOS switch once this current reduces some value (typically 50mA). This prevents inductor current from reversing polarity, avoiding back-charging thus improving efficiency light loads. 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, thus providing better efficiency.
True Shutdown Mode
PS0100 designed allow true shutdown managing body diode PMOS switch. PMOS switch turned there
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PS0100
Anti-Ringing Control
When inductor current goes zero, there arises high frequency ringing pin. prevent this, discharge switch provided between VIN, that this high frequency ringing damped out.
Under Voltage Lockout
When supply becomes (typically below 1.8V), PS0100 produces internal UVLO (Under Voltage Lockout) signal that disables normal operation enables start-up oscillator fixed frequency. this stage, very circuits operational. When oscillator raises supply above 1.9V, UVLO signal disabled normal mode takes over operation start-up oscillator. This mechanism protects chip from producing false logic input supply.
PS0100 features active-high CMOS input enable (SHUTB) that allows on/off control regulator. When SHUTB=Low, shutdown chip occurs that time almost quiescent current (<1µA) flows. output capacitor completely discharged through load feedback resistors real output shutdown. discharge switch internally connected between Enable (SHUTB) input TTL/CMOS compatible. Connect SHUTB normal operation.
Enable Input
Track Mode
PS0100 track mode when greater than output voltage regulation point. 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, regular loop control operation remains off. Instead, regulator runs intermittent oscillator operation.
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PS0100
PACKAGE INFORMATION
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PS0100
DISCLAIMERS
LIFE SUPPORT Power IC's products designed used components devices intended support sustain human life. Power IC's products components intended surgical implants 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 2MHz s

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