Texas Instruments TPS6021 Series User manual

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August 2000 Power Management Products
User’s Guide
SLVU030
查询SLVU030供应商 捷多邦，专业PCB打样工厂，24小时加急出货

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Copyright 2000, Texas Instruments Incorporated

Related Documentation From Texas Instruments
iii
Read This First
Preface
Read This First
About This Manual
This user’s guide describes the evaluation module (EVM)
TPS60210EVM-167.ThisEVMhelpstoevaluatetheperformanceoftheregu-
lated 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
DatasheetofTPS60210/TPS60211/TPS60212/TPS60213(literaturenumber
SLVS296)
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)

iv

Running Title—Attribute Reference
v
Contents
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
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. . . . . . . . . . . . . . . . . . . . . . .

vi

1-1
Description of the EVM
The Texas Instruments TPS60210 charge pump is a regulated voltage dou-
bler. The TPS60210 delivers 3.3-V output voltage (VO) from a 1.8-V to 3.6-V
inputvoltage(VI).Theoutputcurrent(IO)is100mAminimum,foraninputvolt-
age (VI) of 2.0 V or higher.
For output currents below 2 mA, the device can be operated in the snooze
mode(SNOOZE= 0). Thisis an operatingmode, where thequiescent current
is drastically reduced. In this mode, VOis regulated to 3.3 V ±6%. The low
quiescentcurrentis achievedbydisablingmostoftheinternalcircuitryaslong
asVOishighenough.WhenVOdecreases,thedeviceoperatesforashortpe-
riodoftimeinnormal mode, toboostVO.Theinternalcircuitryis thendisabled
again. This reduces the quiescent current to a typical value of only 2 µA. If the
deviceisprogrammedto operate in snooze modeandtheIOincreasesabove
2 mA, the device enters the startup mode to increase VO.
Additionally, the TPS60210 has a low battery detector (LBI input and LBO
output).Thetripvoltageof the LBIinputistypically1.18V.TheTPS60210can
beprogrammedwithan externalresistivedividertothespecific tripvoltagefor
theapplication.OntheEVM,theresistivedividerontheLBIinputisconnected
to VIand 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
LBIisabovethetripvoltage.A1-MΩpullupresistortoVOisaddedontheEVM
to get a defined high signal as long as the voltage at LBI is above the trip
voltage.
For simple evaluation, a 1-MΩresistor between VIand 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
pumparerequired.TheEVMisbuiltwiththesefourcapacitors.Forevaluation,
it is possible to use other capacitor values like those given in the application
sectionoftheTPS6021xdatasheet(literaturenumberSLVS296).Thecapaci-
tors on the EVM are ceramic capacitors. The ESR of all other capacitor types
is too high to get good performance.
Chapter 1

1-2
The TPS60210 EVMs can also be used to evaluate the other devices of this
family(TPS60211, 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
SCPart NumberSearch to go to the productfolder
of the specific device.

2-1
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
2-2
2.1 Schematic of the EVM
Figure 2–1 shows the schematic of the EVM. For this EVM, only ceramic ca-
pacitors 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
1µFC2
1µF
C4
2.2 µF
C3
2.2 µFR1
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 kΩE96-Series LBI input voltage adjustment
R2 576 kΩE96-Series LBI input voltage adjustment
R3 1 MΩPullup for the open drain
output LBO
R4 1 MΩPullup for the SNOOZE input
Table 2–1 contains the bill of material of the TPS60210EVM-167. The follow-
ing paragraph describes the use of some of the parts.
R1 and R2 adjust the input voltage of the LBI input for low battery detection.
Theresistive divider on the EVM is connected toVI. For thegiven resistor val-
ues, the LBO signal will go active (low) if VIis below 2.0 V. The divided input
voltage is compared to the internal reference voltage of 1.18 V. C5 works as
afiltercapacitorfortheLBIinputvoltage.Thiscapacitorisrecommendedifline
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).
ForR3,avaluebetween100kΩand1MΩisrecommended.Ifyourapplication
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
2-3
Physical Data and Setup of the EVM
R4 is the pullup resistor for the SNOOZE pin, therefore, the device operates
innormalmode.ApplyingalogiclowleveltotheSNOOZEinput,programsthe
device in snooze mode.
Note:
Whenthedevice is in snooze mode,beawarethat the LBI and SNOOZEre-
sistors (R1, R2, and R4) draw more current than the device itself. For mea-
suring the low quiescent current in this mode, these three resistors must be
removed.
Foroperationwiththeinternal oscillator,connecttheSNOOZE signal toeither
theinputvoltage(likeontheEVM)oralogichighlevelrespectively,ortoalow-
levelfor operation in snoozemode. The devicecan also be synchronized with
an external oscillator signal. For synchronization to an external oscillator sig-
nal,theSNOOZEpinmustbeconnectedtothissignal.Whentheinternallogic
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
2-4
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.
TheEVMisbuilt to fit into a14-pindualin-linesocket. However,notall14pins
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
2-5
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
2Not 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 Ωor 0 mA to 100 mA for 2.0 V ≤VI≤3.6 V
> 66 Ωor 0 mA to 50 mA for 1.8 V ≤VI< 2 V
> 132 Ωor 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) Connectadcpowersupply(orabatterypack) withanappropriatevoltage
between input (IN), and ground (GND).
1.6 V ≤VI≤3.6 V

Evaluation Information
2-6
2.4 Evaluation Information
Due to the pullup resistor R4 at SNOOZE of the EVM, the TPS60210 is
enabledbydefault.Tooperatethedevicein snoozemode,drivetheSNOOZE
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:
Donot use the devicefor long periodsof time at themaximum 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).