Charge Pump

Power Stage

C1

C1−

C1+

IN

PGND

C2

C2−

C2+

IN

OUT

PGND

Oscillator

Control

Circuit

ENABLE

Shutdown/

Start-up Control

_

+

+

−

VREF

_

+

+

−

0.8 × VI

FB

_

+

+

−

VREF

PG

TPS60141

GND

TPS60140, TPS60141

SLVS273A – FEBRUARY 2000 – REVISED NOVEMBER 2015

www.ti.com

Functional Block Diagrams (continued)

Figure 4. TPS60141 Functional Block Diagram

9.3 Feature Description

9.3.1 Undervoltage Lockout

The TPS6014x devices have an undervoltage lockout feature that deactivates the device and places it in

shutdown mode when the input voltage falls below 1.6 V.

9.3.2 Low-Battery Detector (TPS60140 Only)

The internal low-battery comparator trips at 1.21 V ± 5% when the voltage on pin LBI ramps down. The voltage

recommends that the sum of resistors R1 and R2 to be in the 100-k

Ω to 1-MΩ range. When choosing R1 and

R2, be aware of the input leakage current into the LBI terminal.

LBO is an open-drain output. TI recommends an external pullup resistor to OUT, in the 100-k

Ω to 1-MΩ range.

During start-up, the LBO output signal is invalid for the first 500 µs. LBO is high impedance when the device is

disabled. If the low-battery comparator function is not used, connect LBI to ground and leave LBO unconnected.

8

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