August 2000 Power Management Products
User’s Guide
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Copyright 2000, Texas Instruments Incorporated
Related Documentation From Texas Instruments
Preface
Read This First
About This Manual
This user’s guide describes the evaluation module (EVM)
TPS60210EVM-167. This EVM helps to evaluate the performance of the regulated low-ripple charge pump dc/dc converter TPS60210. The EVM has the
dimension of a 14-pin dual inline package and the board is a single-layer
board. The board design is optimized for performance and space.
The user’s guide also documents the necessary changes to use the board for
the other devices of the TPS6021x family.
How to Use This Manual
For more information about the EVM, please read Chapter 1, Description of
the EVM. Chapter 2 includes the Physical Data and the Setup of the EVM.
Related Documentation From Texas Instruments
Data sheet of TPS60210/TPS6021 1/TPS60212/TPS60213 (literature number
SL VS296)
Erich Bayer, Alexander Müller, Hans Schmeller, and Günter Sporer: Charge
Pump Technology Optimized for Battery-Operated Systems, EE-Times
Special Seminar Series, Analog & Mixed Signal Technology , Oct. 99
Brigitte Kormann: TPS6014x Charge Pump Evaluation Module Design Guide
(literature number SLVU023)
Brigitte Kormann: TPS6010x/TPS6011x Charge Pump Application Report
(literature number SLVA070)
Running Title—Attribute Reference
Contents
1 Description of the EVM 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Physical Data and Setup of the EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Schematic of the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Layout of the EVM 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Setup of the EVM 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Evaluation Information 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures
2–1 Schematic of the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Placement of the Components 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 Single Layer of the EVM 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–4 Actual Size of the EVM, 17,9 mm × 10,2 mm 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T ables
2–1 Bill of Material for the TPS60210 EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Pin Assignment of the Board to a 14-Pin Dual-In-Line Socket 2-5. . . . . . . . . . . . . . . . . . . . . . .
Description of the EVM
The Texas Instruments TPS60210 charge pump is a regulated voltage doubler. The TPS60210 delivers 3.3-V output voltage (VO) from a 1.8-V to 3.6-V
input voltage (VI). The output current (IO) is 100 mA minimum, for an input voltage (V
I
) of 2.0 V or higher.
For output currents below 2 mA, the device can be operated in the snooze
mode (SNOOZE
= 0). This is an operating mode, where the quiescent current
is drastically reduced. In this mode, V
O
is regulated to 3.3 V ±6%. The low
quiescent current is achieved by disabling most of the internal circuitry as long
as VO is high enough. When VO decreases, the device operates for a short period of time in normal mode, to boost VO. The internal circuitry is then disabled
again. This reduces the quiescent current to a typical value of only 2 µA. If the
device is programmed to operate in snooze mode and the I
O
increases above
2 mA, the device enters the startup mode to increase VO.
Additionally, the TPS60210 has a low battery detector (LBI input and LBO
output). The trip voltage of the LBI input is typically 1.18 V . The TPS60210 can
be programmed with an external resistive divider to the specific trip voltage for
the application. On the EVM, the resistive divider on the LBI input is connected
to VI and the trip voltage is set to 2.0 V, typically. The LBO output is an
open-drain output and is in a high-impedance state as long as the voltage at
LBI is above the trip voltage. A 1-MΩ pullup resistor to V
O
is added on the EVM
to get a defined high signal as long as the voltage at LBI is above the trip
voltage.
For simple evaluation, a 1-MΩ resistor between VI and the SNOOZE pin is
added to operate the TPS60210 in normal mode.
A minimum of four external capacitors for a push-pull voltage doubler charge
pump are required. The EVM is built with these four capacitors. For evaluation,
it is possible to use other capacitor values like those given in the application
section of the TPS6021x data sheet (literature number SL VS296). The capacitors on the EVM are ceramic capacitors. The ESR of all other capacitor types
is too high to get good performance.
Chapter 1
The TPS60210 EVMs can also be used to evaluate the other devices of this
family (TPS6021 1, TPS60212, and TPS60213). For that purpose, replace the
integrated circuit. For the TPS60211 and TPS60213, the LBI resistors should
be removed and LBI connected to GND. The LBO pullup resistor works as
power good (PG) pullup, and the LBO pad gives the PG signal.
Free samples of the other parts of the TPS6021x family can be ordered from
http://www.ti.com
. Use the
SC Part Number Search
to go to the product folder
of the specific device.
Physical Data and Setup of the EVM
Physical Data and Setup of the EVM
This section shows the schematic, the layout, and setup of the EVM. The
layout of a charge pump circuit is critical; therefore, the given layout can be
used as a reference and helps to reduce design and evaluation time.
Topic Page
2.1 Schematic of the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Layout of the EVM 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Setup of the EVM 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Evaluation Information 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2
Schematic of the EVM
2.1 Schematic of the EVM
Figure 2–1 shows the schematic of the EVM. For this EVM, only ceramic capacitors with X5R or X7R material are used.
Figure 2–1.Schematic of the EVM
OUTPUT
3.3 V, 100 mA
INPUT
1.8 V to 3.6 V
C1
1µF
C2
1µF
C
4
2.2µF
C
3
2.2µF
R1
R2
1
2
3
4
5
6
7
8
9
10
R3
Low Battery
Warning
IN
C1–
C1+
LBI
TPS60210
OUT
C2–
C2+
LBO
GND
SNOOZE
100 nF
R4
Table 2–1.Bill of Material for the TPS60210 EVM
Component Value Part Number Manufacturer Description
C1, C2 1 µF, 10 V, 0805 LMK212BJ105KG–T Taiyo Yuden Flying capacitors
C3, C4 2.2 µF, 16 V, 1206 EMK316BJ225KL–T Taiyo Yuden Input and output capacitors
C5 100 nF Filter capacitor for the LBI
input signal
IC1 TPS60210 Texas Instruments
R1 402 kΩ E96-Series LBI input voltage adjustment
R2 576 kΩ E96-Series LBI input voltage adjustment
R3 1 MΩ Pullup for the open drain
output LBO
R4 1 MΩ Pullup for the SNOOZE input
Table 2–1 contains the bill of material of the TPS60210EVM-167. The following paragraph describes the use of some of the parts.
R1 and R2 adjust the input voltage of the LBI input for low battery detection.
The resistive divider on the EVM is connected to V
I
. For the given resistor values, the LBO signal will go active (low) if VI is below 2.0 V. The divided input
voltage is compared to the internal reference voltage of 1.18 V. C5 works as
a filter capacitor for the LBI input voltage. This capacitor is recommended if line
or load transients occur. At the switching point of the LBI comparator, noise
may trigger the LBI, and this may lead to oscillations at the LBO pin. The LBO
output is an open-drain output and requires an external pullup resistor (R3).
For R3, a value between 100 kΩ and 1 MΩ is recommended. If your application
does not require low battery detection, these four parts can be omitted. In this
case, connect the LBI-pin to ground.
Schematic of the EVM
Physical Data and Setup of the EVM
R4 is the pullup resistor for the SNOOZE pin, therefore, the device operates
in normal mode. Applying a logic low level to the SNOOZE input, programs the
device in snooze mode.
Note:
When the device is in snooze mode, be aware that the LBI and SNOOZE resistors (R1, R2, and R4) draw more current than the device itself. For measuring the low quiescent current in this mode, these three resistors must be
removed.
For operation with the internal oscillator, connect the SNOOZE signal to either
the input voltage (like on the EVM) or a logic high level respectively , or to a lowlevel for operation in snooze mode. The device can also be synchronized with
an external oscillator signal. For synchronization to an external oscillator signal, the SNOOZE
pin must be connected to this signal. When the internal logic
detects an external clock signal, the device is synchronized to this clock and
the internal clock is turned off. For the appropriate frequency and levels,
please refer to the TPS6021x data sheet (literature number SLVS296).
Layout of the EVM
2.2 Layout of the EVM
Figure 2–2 and Figure 2–3 show the placement of the components and the
layout of the EVM. The components and all signals are exclusively placed on
the top layer of the PC board. Figure 2–4 shows the actual size of the board.
Figure 2–2.Placement of the Components
C1
C2
C3
C4
R2
C5
R3
R4
R1
IC1
Figure 2–3.Single Layer of the EVM
Figure 2–4.Actual Size of the EVM, 17,9 mm × 10,2 mm
Table 2–1 contains the values and description of the five capacitors and the
four resistors that are placed on the EVM.
The EVM is built to fit into a 14-pin dual in-line socket. However, not all 14 pins
are used. Only pins 1 to 3, 7, 8, and 12 to 14 of a dual in-line socket are used.
Table 2–2 shows the correlation between the dual in-line pin number and the
connected signal of the device on the board.
Setup of the EVM
Physical Data and Setup of the EVM
Table 2–2.Pin Assignment of the Board to a 14-Pin Dual-In-Line Socket
Socket Pin Number Connected Signal
1 LBI
2 Not connected
3 OUT
7, 8 GND
12 IN
13 SNOOZE
14 LBO
2.3 Setup of the EVM
Follow these steps for proper operation of the EVM:
1) Connect a load to the output (between GND and OUT).
> 33 Ω or 0 mA to 100 mA for 2.0 V ≤ VI ≤ 3.6 V
> 66 Ω or 0 mA to 50 mA for 1.8 V ≤ VI < 2 V
> 132 Ω or 0 mA to 25 mA for 1.6 V ≤ VI ≤ 1.8 V
Note:
Start up only with resistive load, not with a current sink.
2) Connect a dc power supply (or a battery pack) with an appropriate voltage
between input (IN), and ground (GND).
1.6 V ≤ V
I
≤ 3.6 V
Evaluation Information
2.4 Evaluation Information
Due to the pullup resistor R4 at SNOOZE of the EVM, the TPS60210 is
enabled by default. T o operate the device in snooze mode, drive the SNOOZE
pin of the EVM to ground.
By connecting a clock signal between 400 kHz and 800 kHz to the SNOOZE
pin of the board, the device can be synchronized to an external clock. To get
the proper duty cycle and levels, please refer to the TPS6021x data sheet
(literature number SLVS296). In synchronization, snooze mode can not be
used.
For testing the functionality of the low battery detector (transition on LBO),
reduce the input voltage below 2 V and a transition from high-to-low at LBO
will occur. Trip voltages other than 2 V, can be adjusted by replacing the LBI
resistive divider with the appropriate resistors. For the correct resistor values
for different trip voltages, please refer to the TPS6021x data sheet (literature
number SLVS296).
It is also possible to evaluate several different capacitors on the EVM. A
capacitor selection list with the measured output ripple voltage can be found
in the TPS6021x data sheet (literature number SLVS296).
Note:
Do not use the device for long periods of time at the maximum input voltage,
maximum output current, and maximum ambient temperature. The
dissipated power could heat up the device and may destroy it. This is not a
problem in battery driven systems. For more details refer to the application
part in the TPS6021x data sheet (literature number SLVS296).
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