DC-DC CONVERTER REGULATED CHARGE PUMP REGULATED CHARGE PUMP OUTPU
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ST619LB SERIES
DC-DC CONVERTER REGULATED CHARGE PUMP
REGULATED CHARGE PUMP OUTPUT CURRENT GUARANTEED OVER TEMPERATURE 20mA 30mA INDUCTORS; VERY NOISE USES SMALL, INEXPENSIVE CAPACITORS LOGIC CONTROLLED SHUT-DOWN SUPPLY CURRENT SHUT DOWN DISCONNECTS LOAD FROM INPUT AVAILABLE SO-8 DIP-8 PACKAGES
DIP-8
SO-8
DESCRIPTION ST619LB step-up charge pump DC-DC converter which delivers regulated output 30mA over temperature. input voltage range 3.6V (two battery cells). requires only four external capacitor: 0.22µF flying capacitors, 10µF capacitors input output.
operating supply current (typ 200mA) make device ideal small, portable battery powered applications. When shut down load disconnected from input supply current typically 0.02µA. ST619LB available SO-8 DIP-8 packages.
SCHEMATIC DIAGRAM
November 2000
ST619LB SERIES
OPERATING PRINCIPLE ST619LB able provide regulated output from 3.6V (two battery cells) input. Internal charge pump external capacitors generate output, eliminating need inductors. output voltage regulated pulse skipping controller that turns charge pump when output voltage begins drop. maintain greatest efficiency internal charge pump device operates voltage doubler when ranges from 3.0V 3.6V voltage tripler when ranges from 2.0V 2.5V. When ranges from 2.5V 3.0V ST619LB switches between doubler tripler mode alternating cycles, making charge pump. further enhance efficiency over input range, internal comparator selects higher ST619LB's circuitry. With 20mA typical efficiency value 80%. tripler mode (see block diagram), when switches close, switches open ABSOLUTE MAXIMUM RATINGS
Symbol VSHDN Tstg Input Voltage Output Voltage Shutdown Input Voltage Output Current Continuous Storage Temperature Range Operating Junction Temperature Range Parameter Value -0.3 -0.3 -0.3 0.3) +150 Unit
capacitors charge second half cycle, connected series between when switches open switches close. doubler mode only used. During oscillator cycle, energy transferred from input charge pump capacitors, then from charge pump capacitors output capacitors load. number cycles within given time frame increases load increases input supply voltage decreases. limiting case charge pumps operate continuously, oscillator frequency nominally 500kHz. Shut Down Mode ST619LB enters power shut down mode when SHDN logic high. shut down mode, disconnected from falls SHDN connected ground normal operation. SHDN CMOS compatible input.
Absolute Maximum Ratings those values beyond which damage device occur. Functional operation under these condition implied.
THERMAL DATA
Symbol Rthj-amb Parameter Thermal Resistance Junction-ambient SO-8 DIP-8 Unit °C/W
This value depends from thermal design which device mounted.
ST619LB SERIES
CONNECTION DIAGRAM (top view) DESCRIPTION
Symbol C2GND SHDN Name Function Positive terminal first charge pump capacitor Input supply voltage output voltage. VO=0V when shutdown mode. Positive terminal second charge pump capacitor Negative terminal second charge pump capacitor Ground Active high C-MOS logic level shutdown input. SHDN connected normal operation. Negative terminal first charge pump capacitor
ORDERING CODES
TYPE ST619LB DIP-8 ST619LBN SO-8 ST619LBD SO-8 (T&R) ST619LBDR
ELECTRICAL CHARACTERISTICS (VI=2 3.6V, =0.22µF, =10µF, 85°C, unless otherwise specified. Typical value referred 25°C)
Symbol Parameter Input Voltage Output Voltage 3.6V 3.6V load, Full Load 3.6V 3.6V SHDN Full Load 0.7V SHDN 0.005 Load Load Load =20mA =30mA =20mA 20mA 30mA Test Conditions Min. 0.02 Typ. Max. Unit
VRIPPLE Output Voltage Ripple ISHDN Load Supply Current Shutdown Supply Current Efficency
fOSC
Switching Frequency SHDN Input Threshold SHDN Input Threshold SHDN Input Current
Note: overload short Output Ground. above conditions observed device damaged.
ST619LB SERIES
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified 25°C) Figure Load Supply Current Input Voltage Figure Output Voltage Output Current
Figure Shutdown Supply Current Input Voltage
Figure Efficency Output Current
Figure Maximum Output Current Input Voltage
Figure Efficency Input Voltage
ST619LB SERIES
Figure Output Voltage Input Voltage Figure Line Transient Response
RL=250
Figure Start-up
Figure Load Transient Response
VI=3V, IO=0 25mA
Figure Output Voltage Temperature
ST619LB SERIES
APPLICATION INFORMATION Charge pump capacitors values charge pump capacitors critical ensure adequate output current avoid excessive peak currents. suggested values range 0.22µF 1.0µF avoid higher values capacitors, order obtain best performance. Ceramic tantalum capacitors recommended. Input output capacitors type input capacitor (C3) output filter capacitor (C4) used critical, does affect performance. Tantalums, ceramics aluminium electrolytic suggested. lowest ripple, large, effective series resistance (ESR) ceramic tantalum capacitors. input supply TYPICAL APPLICATION CIRCUIT source impedance very low, omitted. typical application circuit shows component values proper operation using minimal board space. input bypass capacitor (C3) output filter capacitor (C4) should least 10µF. Many capacitors exhibit variation over temperature. Compensate capacitor temperature coefficient selecting large nominal value ensure proper operation over temperature. Layout Consideration below figure, typical application demoboard ST619LB reported. good layout ensures stability helps maintain output voltage under heavy loads. best performance, very short connections capacitors.
TYPICAL APPLICATION DEMOBOARD
ST619LB SERIES
Plastic DIP-8 MECHANICAL DATA
DIM. MIN. 0.44 0.017 2.54 7.62 7.62 0.130 0.063 0.38 1.39 0.91 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 TYP. 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 MAX. MIN. inch TYP. 0.130 MAX.
P001F
ST619LB SERIES
SO-8 MECHANICAL DATA
DIM. MIN. 1.27 3.81 1.27 (max.) 0.14 0.015 0.65 0.35 0.19 0.25 TYP. MAX. 1.75 0.25 1.65 0.85 0.48 0.25 (typ.) 0.188 0.228 0.050 0.150 0.157 0.050 0.023 0.196 0.244 0.025 0.013 0.007 0.010 0.003 MIN. inch TYP. MAX. 0.068 0.009 0.064 0.033 0.018 0.010 0.019
0016023
ST619LB SERIES
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