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TPS61221DCKR
Tiny Low Input Voltage Boost Converter
0.01 0.1 1 10 100
OUTI - Output Current - mA
- Input V
oltage - V 90% 80% 70%
OUT(V = 3.3V)
Efficiency vs Output Current and Input VoltageL
10µF
4.7µH
VIN
VOUT
10µF
GND
TPS61220
VOUT
1.8 V to 6 VR10.7 V to VOUT
VIN
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Design
TPS61220, TPS61221, TPS61222SLVS776B–JANUARY 2009–REVISED NOVEMBER 2014
TPS6122x Low Input Voltage, 0.7V Boost Converter With 5.5μA Quiescent Current Features 3 DescriptionThe TPS6122x family devices providea power-supply Upto 95% Efficiencyat Typical Operating solution for products poweredby eithera single-cell,Conditions two-cell,or three-cell alkaline, NiCdor NiMH,or one-• 5.5 μA Quiescent Current cell Li-Ion or Li-polymer battery. Possible output Startup Into Loadat 0.7V Input Voltage currents depend on the input-to-output voltage ratio.
The boost converter is based ona hysteretic• Operating Input Voltage from 0.7Vto 5.5V controller topology using synchronous rectificationto• Pass-Through Function during Shutdown obtain maximum efficiency at minimal quiescent• Minimum Switching Current 200 mA currents. The output voltageof the adjustable version
canbe programmedby an external resistor divider,or• Protections: set internally toa fixed output voltage. The– Output Overvoltage converter can be switched off bya featured enable– Overtemperature pin. While being switched off, battery drain is
minimized. The deviceis offeredina 6-pin SC-70– Input Undervoltage Lockout
package (DCK) measuring2 mmx2 mmto enable• Adjustable Output Voltage from 1.8Vto6V small circuit layout size.• Fixed Output Voltage Versions Small 6-pin SC-70 Package
Device Information(1)2 Applications Battery Powered Applications– 1to3 Cell Alkaline, NiCdor NiMH 1 cell Li-Ionor Li-Primary (1) Forall available packages, see the orderable addendumat
the endof this document.• Solaror Fuel Cell Powered Applications Consumer and Portable Medical Products Personal Care Products Whiteor Status LEDs Smartphones
Simplified Schematic
