Silicon Laboratories TS3300 User Manual

UG188: TS3300 EVB User's Guide

A 0.6–3.0 V IN, 1.8–3.6 V OUT, 3.5 µA, High-Efficiency Boost +
Output Load Switch

The demo board for the TS3300 is a completely assembled and tested circuit board that
can be used for evaluating the TS3300. The TS3300 is a power management product
that combines a high-efficiency boost regulator and an output load switch in one pack­age.

The TS3300 includes an Anti-crush™ feature to prevent the collapse of the input voltage
to the boost regulator when the input is a weak (high impedance) source. If the input
voltage drops below a pre-determined voltage threshold (settable by a resistor divider),
the boost regulator switching cycles are paused, effectively limiting the minimum input
voltage. A pull-down resistor pad is available in order to set the anti-crush voltage.

The TS3300 boost regulator is set to an output voltage of 3.6 V via a resistor divider cir­cuit. The TS3300 is fully specified over the –40°C to +85°C temperature range and is
available in a low-profile, thermally-enhanced 16-pin 3×3 mm TQFN package with an ex­posed back-side paddle. The product data sheet and additional documentation can be
found at www.silabs.com.

KEY FEATURES

• Boost Regulator

• Input Voltage: 0.6 V – 3 V

• Output Voltage: 3.6 V

• Shutdown Control Jumper

• Coilcraft 10 µH Inductor
(LPS4018-103ML)

•

Resistor Pad Available for Anti-Crush
Voltage Setting

™

TS3300 Demo Board (Top View)

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UG188: TS3300 EVB User's Guide

Functional Description

1. Functional Description

Boost Regulator Output Voltage Setting

The TS3300 boost regulator is set to an output voltage of 3 V via a resistor divider circuit, as shown in the figure below.

Figure 1.1. Setting the Boost Output Voltage with a Voltage Divider

The output feedback (BO FB) pin is 505 mV. It is recommended to use large resistor values to minimize additional current draw at the
output. Resistors values less than 8 MΩ are recommended. Boost output voltage can be set by solving for R3 for a given R6 value in
the following equation:

VBO− 0.505)R6

(

R3 =

0.505

To set a 3 V output voltage with R6 = 1.37 MΩ, R3 is calculated to be 6.77 MΩ. A 1% standard resistor value of 6.81 MΩ is selected.
This results in an output voltage of 3.02 V.

Anti-Crush™ Voltage Setting

To set the anti-crush voltage, a feedback pin (BI FB) in conjunction with a voltage divider circuit can be implemented, as shown in the
figure below. The feedback pin voltage is 392 mV. It is recommended to use large resistor values to minimize additional current draw at
the input.

Figure 1.2. Setting the Anti-Crush Voltage with a Voltage Divider

Using the following equation to solve for R1 for a given R2 value, the output voltage can be set:

R1 =

V

(

ANTI −CRUSH

− 0.392)R2

0.392

To set a 0.8V output voltage with R2 = 1.37 MΩ, R1 is calculated to be 1.42 MΩ. A 1% standard resistor value of 1.37 MΩ is selected.
This results in an anti-crush voltage of 784 mV. The anti-crush voltage is to be set above the minimum input voltage specification of the
TS3300. Refer to the TS3300 Data Sheet “Applications Information” section for more details.

TS3300 Configurations

The TS3300 can be operated in either a Boost Only Configuration or in a Boost + Output Load Switch Configuration. The TS3300
Demo Board is designed so that both circuit configurations can be evaluated. Two sets of Quick-Start Procedures are provided, detail­ing how to evaluate each circuit configuration. If the Output Load Switch is not needed, it is recommended to use the Boost Only Con­figuration, since the lowest quiescent current is achievable this way.

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UG188: TS3300 EVB User's Guide

Quick-Start Procedure

2. Quick-Start Procedure

2.1 Required Equipment

• TS3300 Demo Board

• 1.2 V Battery or Power Supply

• Two Digital Multimeters

• Oscilloscope

2.2 Boost + Output Load Switch Configuration

To evaluate the Boost + Output Load Switch configuration, the following steps should be performed:

1. Connect Jumper J1 LOW. The pin should be connected to the Lo pin, otherwise PCB ground.

2. Connect the provided Jumper so that the REGIN pin is connected to the BOOST_OUT pin.

3. Connect Jumper J3 LOW. The REGEN pin should be connected to the Lo pin, otherwise PCB ground.

4. Connect the battery positive terminal to the test point labeled BOOST_IN. Connect the negative terminal of the battery to the test
point labeled GND.

5. To monitor the boost regulator output voltage, connect the positive terminal of the voltmeter to the test point labeled BOOST_OUT.
Connect the negative terminal of the voltmeter to the test point labeled GND. Connect the Oscilloscope probe to the test point la­beled BOOST_OUT to monitor the output ripple. The BOOST_OUT voltage should be regulated at approximately 3.02 V.

6. To monitor the output load switch voltage, V

REGOUT

OUT. Connect the negative terminal of the voltmeter to the test point labeled GND. The REGOUT voltage should be regulated at
approximately 3.02 V. Connect the Oscilloscope probe to the test point labeled REGOUT to monitor the output load switch.

7. To disable the Output Load Switch, connect Jumper J3 HIGH. The REGEN pin should be connected to the Hi pin, otherwise RE­GIN. The output load switch voltage, V

REGOUT

8. To enable the Output Load Switch, connect Jumper J3 LOW. The REGEN pin should be connected to the Lo pin, otherwise PCB
ground. The output load switch voltage, V

REGOUT

, connect the positive terminal of the voltmeter to the test point labeled REG-

, should drop to 0 V.

, should be approximately equal to V

BOOST_OUT

.

Table 2.1. Output Load Switch settings for Boost + Output Load Switch Configuration

Output Load Switch Function

REG FB SW EN REG IN REG EN Function

High

V

REGOUT

= GND

(OFF State)

REG FB, SW EN, REGIN should be connected to BO.

Low V

REGOUT

= V

BO

(ON State)

2.3 Boost Only Configuration

To evaluate the Boost Only configuration, the following steps should be performed:

1. Connect Jumper J1 LOW. The BENb pin should be connected to the Lo pin, otherwise PCB ground.

2. Connect the provided Jumper so that the REGIN pin is connected to the GND pin.

3. Connect Jumper J3 LOW. The REGEN pin should be connected to the LO pin, otherwise PCB ground.

4. Connect REGOUT to PCB Ground.

5. Connect the battery positive terminal to the test point labeled BOOST_IN. Connect the negative terminal of the battery to the test
point labeled GND.

6. To monitor the boost regulator output voltage, connect the positive terminal of the voltmeter to the test point labeled BOOST_OUT.
Connect the negative terminal of the voltmeter to the test point labeled GND. Connect the Oscilloscope probe to the test point la­beled BOOST_OUT to monitor the output ripple. The BOOST_OUT voltage should be regulated at approximately 3.02 V.

7. To shutdown the boost regulator, connect Jumper J1 HIGH. The BENb pin should be connected to the Hi pin, otherwise
BOOST_IN. The boost output voltage, V

BOOST_OUT

, should drop to 0 V. The input supply current reduces to 0.1 µA.

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