Texas Instruments TPS61090, Instruction Manual

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SW
C1 Power
Supply
L1
R1
R2
VBAT
VOUT
FB
C2 C3
LBO
PGND
LBI
SYNC
EN
GND
TPS6109x
V
OUT
Boost Output
Low Battery
Output
R3
R4
R5
TPS61090, TPS61091, TPS61092
www.ti.com SLVS484C – JUNE 2003 – REVISED DECEMBER 2014
10 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
The devices are designed to operate from an input voltage supply range between 1.8 V and 5.5 V with a
maximum switch current limit up to 2500 mA. The SYNC pin can be used to select different operation modes. To
enable power save, SYNC must be set low. The devices operate in PWM mode from the medium to heavy load
conditions and in power save mode at light load condition. In PWM mode, the TPS6109x converter operates with
the nominal switching frequency of 600 kHz. As the load current decreases, the converter enters power save
mode, reducing the switching frequency and minimizing the IC quiescent current to achieve high efficiency over
the entire load current range. The power save mode can be disabled by setting the SYNC to VBAT, TPS6109x
converter always operates with the nominal switching frequency of 600 kHz across the whole load range.
Applying an external clock with a duty cycle at the SYNC pin forces the converter to operate at the applied clock
frequency.
10.2 Typical Applications
10.2.1 Typical Application Circuit for Adjustable Output Voltage Option
Figure 14. Typical Application Circuit for Adjustable Output Voltage Option Schematic
10.2.1.1 Design Requirements
Table 3. TPS6109x 5 V Output Design Parameters
DESIGN
TYPICAL VALUES
PARAMETERS
Input Voltage Range 1.8 V to 5.0 V
Output Voltage 5.0 V
Output Voltage Ripple ±3% VOUT
Transient Response ±10% VOUT
Input Voltage Ripple ±200 mV
Output Current Rating 500 mA
Operating Frequency 600 kHz
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