TPS61220 Datasheet, PDF (1/22 Pages) Texas Instruments – LOW INPUT VOLTAGE STEP-UP CONVERTER IN 6 PIN SC-70 PACKAGE

TPS61220
TPS61221
TPS61222
www.ti.com ............................................................................................................................................................................................... SLVS776 – JANUARY 2009
LOW INPUT VOLTAGE STEP-UP CONVERTER IN 6 PIN SC-70 PACKAGE
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 5.5 V
• Fixed Output Voltage Versions
• Small 6-pin SC-70 Package
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
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.
L₁
V_IN
L
4.7 µH
VOUT
V_OUT
R₁
C₂
1.8 V to 5.5 V
10µ F
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
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated