TPS61220_15 Datasheet, PDF (1/27 Pages) Texas Instruments – TPS6122x Low Input Voltage, 0.7V Boost Converter With 5.5μA Quiescent Current

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TPS61220, TPS61221, TPS61222
SLVS776B – JANUARY 2009 – REVISED NOVEMBER 2014
TPS6122x Low Input Voltage, 0.7V Boost Converter With 5.5μA Quiescent Current
1 Features
•1 Up to 95% Efficiency at Typical Operating
Conditions
• 5.5 μA Quiescent Current
• Startup Into Load at 0.7 V Input Voltage
• Operating Input Voltage from 0.7 V to 5.5 V
• Pass-Through Function during Shutdown
• Minimum Switching Current 200 mA
• Protections:
– Output Overvoltage
– Overtemperature
– Input Undervoltage Lockout
• Adjustable Output Voltage from 1.8 V to 6 V
• Fixed Output Voltage Versions
• Small 6-pin SC-70 Package
2 Applications
• Battery Powered Applications
– 1 to 3 Cell Alkaline, NiCd or NiMH
– 1 cell Li-Ion or Li-Primary
• Solar or Fuel Cell Powered Applications
• Consumer and Portable Medical Products
• Personal Care Products
• White or Status LEDs
• Smartphones
3 Description
The TPS6122x family devices provide a power-supply
solution for products powered by either a single-cell,
two-cell, or three-cell alkaline, NiCd or NiMH, or one-
cell Li-Ion or Li-polymer battery. Possible output
currents depend on the input-to-output voltage ratio.
The boost converter is based on a hysteretic
controller topology using synchronous rectification to
obtain maximum efficiency at minimal quiescent
currents. The output voltage of the adjustable version
can be programmed by an external resistor divider, or
is set internally to a fixed output voltage. The
converter can be switched off by a featured enable
pin. While being switched off, battery drain is
minimized. The device is offered in a 6-pin SC-70
package (DCK) measuring 2 mm x 2 mm to enable
small circuit layout size.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61220
TPS61221
SC-70 (6)
2.00mm x 1.25mm
TPS61222
(1) For all available packages, see the orderable addendum at
the end of this document.
4 Simplified Schematic
L₁
V_IN
L
4.7 µH
VOUT
V_OUT
R₁
C₂
1.8 V to 6 V
10µF
VIN
FB
0.7 V to V_OUT
C₁
EN
R₂
10 µF
GND
TPS61220
Efficiency vs Output Current and Input Voltage (V_OUT = 3.3V)
≥ 70%
0.8
1.3
≥ 80%
1.8
2.3
≥ 90%
2.8
0.01
0.1
1
10
100
I _OUT - Output Current - mA
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.