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TLV61224
SLVSAM7A – MARCH 2011 – REVISED MAY 2015
TLV61224 Single-Cell, High-Efficient, Step-Up Converter in 6-Pin SC-70 Package
1 Features
3 Description
•
The TLV61224 device provides a power-supply
solution for products powered by either a single-cell
or 2-cell alkaline or NiMH, or 1-cell Li-primary battery.
Possible output currents depend on the input-tooutput voltage ratio. The boost converter is based on
a hysteretic controller topology using synchronous
rectification to obtain maximum efficiency at minimal
quiescent currents. The output voltage of this device
is set internally to a fixed output voltage of 3 V. The
converter can be switched off by a featured enable
pin. While being switched off, battery drain is
minimized. The device is offered in a 6-pin SC-70
package (DCK) measuring 2 mm × 2 mm to enable
small circuit layout size.
1
•
•
•
•
•
•
•
•
•
Up to 94% Efficiency at Typical Operating
Conditions
5-μA Quiescent Current
Operating Input Voltage From 0.7 V to 3 V
Pass-Through Function During Shutdown
Output Current of More Than 40 mA From a 1.2-V
Input
Typical Switch Current Rating 400 mA
Output Overvoltage Protection
Overtemperature Protection
Fixed 3-V Output Voltage
Small 6-Pin SC-70 Package
Device Information(1)
2 Applications
•
•
•
PART NUMBER
TLV61224
Battery Powered Applications
– 1- to 2-Cell NiMH or Alkaline
– 1-Cell Li-Primary
Consumer and Portable Medical Products
Personal Care Products
PACKAGE
SOT (6)
BODY SIZE (NOM)
2.00 mm × 1.25 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
L1
4.7 µH
VIN
0.8 V to VOUT
VOUT
L
VIN
C1
10 µF
FB
C2
10 µF
VOUT
3.0 V
EN
GND
TLV61224
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TLV61224
SLVSAM7A – MARCH 2011 – REVISED MAY 2015
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Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
4
4
4
4
5
6
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Typical Characteristics ..............................................
Detailed Description .............................................. 8
7.1
7.2
7.3
7.4
Overview ...................................................................
Functional Block Diagram .........................................
Feature Description...................................................
Device Functional Modes..........................................
8
8
8
9
8
Application and Implementation ........................ 10
8.1 Application Information............................................ 10
8.2 Typical Application ................................................. 10
9 Power Supply Recommendations...................... 13
10 Layout................................................................... 13
10.1 Layout Guidelines ................................................. 13
10.2 Layout Example .................................................... 13
10.3 Thermal Considerations ........................................ 14
11 Device and Documentation Support ................. 15
11.1
11.2
11.3
11.4
11.5
11.6
Device Support......................................................
Documentation Support ........................................
Community Resource............................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
15
15
15
15
15
15
12 Mechanical, Packaging, and Orderable
Information ........................................................... 15
4 Revision History
Changes from Original (March 2011) to Revision A
•
2
Page
Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
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5 Pin Configuration and Functions
DCK Package
6-Pin SOT
Top View
VIN
FB
GND
EN
L
VOUT
Pin Functions
PIN
NAME
NO.
EN
6
FB
GND
I/O
DESCRIPTION
I
Enable input (1: enabled, 0: disabled). Must be actively tied high or low.
2
I
Output voltage sense input. Must be connected to VOUT.
3
–
Control / logic and power ground
L
5
I
Connection for Inductor
VIN
1
I
Boost converter input voltage
VOUT
4
O
Boost converter output voltage
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TLV61224
SLVSAM7A – MARCH 2011 – REVISED MAY 2015
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
Voltage (2)
Temperature
(1)
(2)
MIN
MAX
UNIT
VIN, L, VOUT, EN, FB
–0.3
7.5
V
Operating junction temperature, TJ
–40
150
°C
Storage, Tstg
–65
150
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltages are with respect to network ground terminal.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±2000
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
±1500
Machine model (MM)
±200
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
MIN
NOM
MAX
UNIT
VIN
Supply voltage at VIN
0.7
3
V
TA
Operating free air temperature
–40
85
°C
TJ
Operating virtual junction temperature
–40
125
°C
6.4 Thermal Information
TLV61224
THERMAL METRIC
(1)
DCK (SOT)
UNIT
6 PINS
RθJA
Junction-to-ambient thermal resistance
231.9
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
55.8
°C/W
RθJB
Junction-to-board thermal resistance
77.3
°C/W
ψJT
Junction-to-top characterization parameter
0.7
°C/W
ψJB
Junction-to-board characterization parameter
76.4
°C/W
(1)
4
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
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6.5 Electrical Characteristics
over recommended free-air temperature range and over recommended input voltage range (typical at an ambient temperature
range of 25°C) (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DC-DC STAGE
VIN
Input voltage range
VIN
Maximum minimum input voltage
RLoad ≥ 150 Ω, TA = 25°C
for start-up
0.7
VOUT
TLV61224 output voltage
ILH
Inductor current ripple
ISW
0.7
VIN < VOUT
2.85
switch current limit
VOUT = 3 V, VIN = 1.2 V
160
RDSon_HSD
Rectifying switch ON-resistance
VOUT = 3 V
RDSon_LSD
Main switch ON-resistance
Line regulation
Load regulation
3
3.15
200
mA
mA
1000
mΩ
VOUT = 3 V
600
mΩ
VIN < VOUT
0.5%
VIN < VOUT
0.5%
1
10
VEN = 0 V, VIN = 1.2 V, VOUT ≥ VIN
0.2
1
Leakage current into VOUT
VEN = 0 V, VIN = 1.2 V, VOUT = 3 V
1
ILKG_L
Leakage current into L
VEN = 0 V, VIN = 1.2 V, VL = 1.2 V, VOUT ≥
VIN
IEN
EN input current
Clamped on GND or VIN (VIN < 1.5 V)
ISD
Shutdown
current
ILKG_VOUT
VOUT
VIN
V
400
5
Quiescent
current
V
V
0.5
IQ
VIN
3
IO = 0 mA, VEN = VIN = 1.2 V, VOUT = 3 V
μA
μA
μA
0.01
0.7
μA
0.005
0.1
μA
CONTROL STAGE
Maximum EN input low voltage
VIN ≤ 1.5 V
VIH
Minimum EN input high voltage
VIN ≤ 1.5 V
VIL
Maximum EN input low voltage
VIN > 1.5 V
0.4
V
VIH
Minimum EN input high voltage
VIN > 1.5 V
1.2
V
VUVLO
Undervoltage lockout threshold
for turnoff
VIN decreasing
500
mV
VIL
0.2 × VIN
V
0.8 ×
VIN
Undervoltage lockout hysteresis
50
Overvoltage protection threshold
5.5
V
mV
7.5
V
Overtemperature protection
140
°C
Overtemperature hysteresis
20
°C
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TLV61224
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6.6 Typical Characteristics
Table 1. Table of Graphs
FIGURE
Minimum of Maximum Output
Current
Efficiency
Input Current
Output Voltage
6
vs Input Voltage
Figure 1
vs Output Current, VIN = [1.2 V; 2.4 V]
Figure 2
vs Input Voltage, IOUT = [100 uA; 1 mA; 10 mA; 50 mA]
Figure 3
vs Input Voltage at No Output Load, Device Enabled
Figure 4
vs Output Current, VIN = [1.2 V; 2.4 V]
Figure 5
vs Input Voltage, Device Disabled, RLOAD = [1 kΩ; 10 kΩ]
Figure 6
Figure 1. Minimum of Maximum Output Current vs Input
Voltage
Figure 2. Efficiency vs Output Current
Figure 3. Efficiency vs Input Voltage
Figure 4. Input Current vs Input Voltage at No Output Load,
Device Enabled
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Figure 5. Output Voltage vs Output Current
Figure 6. Output Voltage vs input Voltage, Device Disabled
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TLV61224
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7 Detailed Description
7.1 Overview
The TLV61224 device is a high-performance, high-efficient boost converter. To achieve high-efficiency, the
power stage is implemented as a synchronous boost topology. Two actively controlled low RDSon power
MOSFETs are used to achieve power switching.
7.2 Functional Block Diagram
L
VOUT
VOUT
VIN
Gate
Driver
VIN
Start Up
EN
Device
Control
Current
Sensor
FB
GND
VREF
7.3 Feature Description
7.3.1 Controller Circuit
The device is controlled by a hysteretic current-mode controller. This controller regulates the output voltage by
keeping the inductor ripple current constant in the range of 200 mA and adjusting the offset of this inductor
current depending on the output load. If the required average input current is lower than the average inductor
current defined by this constant ripple, the inductor current becomes discontinuous to keep the efficiency high at
low-load conditions.
IL
Continuous Current Operation
Discontinuous Current Operation
200 mA
(typ.)
200 mA
(typ.)
t
Figure 7. Hysteretic Current Operation
The output voltage VOUT is monitored through the internal feedback network, which is connected to the voltage
error amplifier. To regulate the output voltage, the voltage error amplifier compares this feedback voltage to the
internal voltage reference and adjusts the required offset of the inductor current accordingly.
8
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Feature Description (continued)
7.3.2 Start-up
After the EN pin is tied high, the device starts to operate. If the input voltage is not high enough to supply the
control circuit properly, a start-up oscillator starts to operate the switches. During this phase the switching
frequency is controlled by the oscillator and the maximum switch current is limited. As soon as the device has
built up the output voltage to about 1.8 V (high enough for supplying the control circuit) the device switches to its
normal hysteretic current mode operation. The start-up time depends on input voltage, load current, and output
capacitance.
7.3.3 Operation at Output Overload
If the inductor current is in normal boost operation, the current reaches the internal switch current limit threshold.
The main switch is turned off to stop a further increase of the input current.
In this case, the output voltage decreases because with limited input current it is no longer possible to provide
sufficient power to the output to maintain the programmed output voltage.
If the output voltage drops below the input voltage, the back-gate diode of the rectifying switch gets forwardbiased and current starts flowing through it. This diode cannot be turned off, so the current finally is only limited
by the remaining DC resistances. As soon as the output load decreases to a value the converter can supply, the
converter resumes normal operation providing the set output voltage.
7.3.4 Undervoltage Lockout
An implemented undervoltage lockout function (UVLO) stops the operation of the converter if the input voltage
drops below the typical UVLO threshold. This function is implemented to prevent malfunctioning of the converter
and protect batteries against deep discharge.
7.3.5 Overvoltage Protection
If, for any reason, the output voltage is not fed back properly to the input of the voltage amplifier, control of the
output voltage will not work anymore. Therefore, overvoltage protection is implemented to avoid the output
voltage exceeding critical values for the device and possibly for the system it is supplying. For this protection the
output voltage of the TLV61224 device is also monitored internally. If the output voltage of the device reaches
the internally programmed threshold, the voltage amplifier regulates the output voltage to this value.
7.3.6 Overtemperature Protection
The device has a built-in temperature sensor which monitors the internal IC junction temperature. If the
temperature exceeds the programmed threshold (see Electrical Characteristics), the device stops operating. As
soon as the IC temperature has decreased below the programmed threshold, it starts operating again. To
prevent unstable operation close to the region of overtemperature threshold, a built-in hysteresis is implemented.
7.4 Device Functional Modes
7.4.1 Device Enable and Shutdown Mode
The device is enabled when EN pin is set high and shut down when EN is low. During shutdown, the converter
stops switching and all internal control circuitry is turned off. In this case, the input voltage is connected to the
output through the back-gate diode of the rectifying MOSFET. This means that voltage will always exist at the
output, which can be as high as the input voltage or lower depending on the load.
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8 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.
8.1 Application Information
The TLV61224 device is intended for systems which are powered by a single-cell battery to up to two Alkaline,
NiCd, or NiMH cells with a typical terminal voltage from 0.7 V to 3 V and can output 3-V voltage. Additionally, any
other voltage source with a typical output voltage from 0.7 V to 3 V can be used with the TLV61224 device.
8.2 Typical Application
L1
4.7 µH
VIN
0.8 V to VOUT
VOUT
L
VIN
C1
10 µF
C2
10 µF
FB
VOUT
3.0 V
EN
GND
TLV61224
Figure 8. Typical Application Schematic
8.2.1 Design Requirements
In this example, TLV61224 device is used to design a 3-V power supply with up to 15-mA output current
capability. The TLV61224 device can be powered by a single-cell battery to up to two Alkaline, NiCd, or NiMH
cells with a typical terminal voltage from 0.7 V to 3 V. The input voltage range is from 0.8 V to 1.5 V for singlecell Alkaline battery input design.
8.2.2 Detailed Design Procedure
8.2.2.1 Programming the Output Voltage
At fixed voltage versions, the output voltage is programmed by an internal resistor divider. The FB pin is used to
sense the output voltage. To configure the devices properly, the FB pin must be connected directly to VOUT.
8.2.2.2 Inductor Selection
To make sure that the TLV61224 devices can operate, a suitable inductor must be connected between pin VIN
and pin L. Inductor values of 4.7 μH show good performance over the whole input and output voltage range.
Due to the fixed inductor current ripple control the switching frequency is defined by the inductor value. For a
given switching frequency, input and output voltage the required inductance can be estimated using Equation 1.
L=
V ´ (VOUT - VIN )
1
´ IN
f ´ 200 mA
VOUT
(1)
Using inductor values greater than 4.7 μH can improve efficiency because greater values cause lower switching
frequency and less switching losses. TI does not recommend using inductor values less than 2.2 μH.
To ensure reliable operation of the TLV61224 device under all load conditions, TI recommends using inductors
with a current rating of 400 mA or higher. This will cover normal operation including current peaks during line and
load transients.
10
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Typical Application (continued)
Table 2 lists the inductor series from different suppliers that have been used with the TLV61224 converter:
Table 2. List of Inductors
VENDOR
INDUCTOR SERIES
EPL3015
Coilcraft
EPL2010
Murata
LQH3NP
Tajo Yuden
NR3015
Wurth Elektronik
WE-TPC Typ S
8.2.2.3 Capacitor Selection
8.2.2.3.1
Input Capacitor
TI recommends at least a 10-μF input capacitor to improve transient behavior of the regulator and EMI behavior
of the total power supply circuit. TI recommends placing a ceramic capacitor as close as possible to the VIN and
GND pins of the IC.
8.2.2.3.2
Output Capacitor
For the output capacitor C2, TI recommends placing small ceramic capacitors as close as possible to the VOUT
and GND pins of the IC. There are no minimum output capacitor ESR requirements for maintaining control loop
stability. If, for any reason, the application requires the use of large capacitors which cannot be placed close to
the IC, TI recommends using a small ceramic capacitor with a capacitance value in the range of 2.2 μF in parallel
to the large capacitor. This small capacitor should be placed as close as possible to the VOUT and GND pins of
the IC.
A minimum capacitance value of 4.7 μF should be used; TI recommends a value of 10 μF. Use Equation 2 to
calculate the required output capacitance in case an inductor with a value greater than 4.7 μH has been
selected.
C2 ³
L
´
2
(2)
8.2.3 Application Curves
Input Voltage
500 mV/div, DC
Output Current
20 mA/div, DC
Output Voltage
10 mV/div, AC
Output Voltage
10 mV/div, AC
VIN = 1.2 V, IOUT = 10 mA to 30 mA
TLV61224
VIN = 0.9 V to 1.2 V, IOUT = 30 mA
TLV61224
Time 2 ms/div
Figure 9. Load Transient Response
Time 2 ms/div
Figure 10. Line Transient Response
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Enable Voltage
2 V/div, DC
Output Voltage
500 mV/div, DC
Inductor Current
100 mA/div, DC
VIN = 1.2 V, RLOAD = 150 W
TLV61224
Time 40 ms/div
Figure 11. Start-Up After Enable
Table 3 lists the components used for the waveform measurements.
Table 3. List of Components:
COMPONENT
REFERENCE
PART NUMBER
MANUFACTURER
VALUE
C1
GRM188R60J106ME84D
Murata
10 μF, 6.3 V
C2
GRM188R60J106ME84D
Murata
10 μF, 6.3 V
L1
EPL3015-472MLB
Coilcraft
4.7 μH
12
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9 Power Supply Recommendations
The power supply can be 1-cell or 2-cell alkaline, NiCd or NiMH batteries. The input supply should be well
regulated with the rating of TLV61224 device. If the input supply is located more than a few inches from the
device, additional bulk capacitance may be required in addition to the ceramic bypass capacitors. An electrolytic
or tantalum capacitor with a value of 47 µF is a typical choice.
10 Layout
10.1 Layout Guidelines
As for all switching power supplies, the layout is an important step in the design, especially at high peak currents
and high switching frequencies. If the layout is not carefully done, the regulator could show stability problems as
well as EMI problems. Therefore, use wide and short traces for the main current path and for the power ground
paths. The input and output capacitor, as well as the inductor should be placed as close as possible to the IC.
To lay out the ground, TI recommends using short traces as well, separated from the power ground traces. This
avoids ground shift problems, which can occur due to superimposition of power ground current and control
ground current. Assure that the ground traces are connected close to the device GND pin.
10.2 Layout Example
L1
VOUT
Enable
VIN
C2
VIN
GND
VOUT
C1
GND
Figure 12. PCB Layout Suggestion
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10.3 Thermal Considerations
Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires
special attention to power dissipation. Many system-dependent issues such as thermal coupling, airflow, added
heat sinks and convection surfaces, and the presence of other heat-generating components affect the powerdissipation limits of a given component.
Three basic approaches for enhancing thermal performance are listed below.
• Improving the power-dissipation capability of the PCB design
• Improving the thermal coupling of the component to the PCB
• Introducing airflow in the system
For more details on how to use the thermal parameters in the dissipation ratings table, check the Thermal
Characteristics of Linear and Logic Packages Using JEDEC PCB Designs application note (SZZA017) and the
Semiconductor and IC Package Thermal Metrics application note (SPRA953).
14
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11 Device and Documentation Support
11.1 Device Support
11.1.1 Third-Party Products Disclaimer
TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT
CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES
OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER
ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.
11.2 Documentation Support
11.2.1 Related Documentation
•
•
Thermal Characteristics of Linear and Logic Packages Using JEDEC PCB Designs, SZZA017
Semiconductor and IC Package Thermal Metrics, SPRA953
11.3 Community Resource
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.4 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
TLV61224DCKR
ACTIVE
SC70
DCK
6
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
QXC
TLV61224DCKT
ACTIVE
SC70
DCK
6
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
QXC
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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