REG71055-Q1 [TI]
30-mA 5.5-V BOOST CHARGE PUMP; 30 mA的5.5 -V升压式电荷泵
| 型号： | REG71055-Q1 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 30-mA 5.5-V BOOST CHARGE PUMP |
| 文件： | 总15页 (文件大小：465K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
REG71055-Q1
www.ti.com....................................................................................................................................................................................................... SBAS477–JULY 2009
30-mA 5.5-V BOOST CHARGE PUMP
1
FEATURES
•
•
•
•
•
•
Qualified for Automotive Applications
Input Voltage Range: 3.0 V to 5.5 V
Automatic Step-Up Operation
Low Input Current Ripple
•
1-MHz Internal Oscillator Allows Small
Capacitors
•
•
•
•
Shutdown Mode
Thermal and Current Limit Protection
5.5-V Output Voltage
Low Output Voltage Ripple
Small TSOT23-6 (DDC) Package
Minimum Number of External Components, No
Inductors
DESCRIPTION
The REG71055 is a switched capacitor voltage converter that produces a regulated, low-ripple output voltage
from an unregulated input voltage. Input supply voltage of 3.0 V to 5.5 V makes the REG71055 ideal for a variety
of battery sources, such as single-cell Li-Ion, or two- and three-cell nickel- or alkaline-based chemistries.
The input voltage may vary below the output voltage and the output remains in regulation. It works equally well
for step-up applications without the need for an inductor, providing low EMI dc/dc conversion. The high switching
frequency allows the use of small surface-mount capacitors, saving board space and reducing cost. The
REG71055 is thermally protected and current limited, protecting the load and the regulator during fault
conditions. Typical ground pin current (quiescent current) is 65 µA with no load, and less than 1 µA in shutdown
mode.
CPUMP
0.22mF
Enable
REG71055
3.3V to
R
R
R
4.2V
CIN
COUT
2.2mF
2.2mF
GND
LED
LED
LED
White LED Backlight Application
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated
REG71055-Q1
SBAS477–JULY 2009....................................................................................................................................................................................................... www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ORDERING INFORMATION(1)
TA
PACKAGE(2)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
GIXI
–40°C to 85°C
TSOT-23 – DDC
Reel of 3000
REG71055IDDCRQ1
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
DDC PACKAGE
(TOP VIEW)
1
2
3
6
5
4
CPUMP+
VIN
VOUT
GND
CPUMP-
Enable
SIMPLIFIED BLOCK DIAGRAM
CPUMP
0.22 µF
4
6
5
REG71055
VIN
CIN
2.2 µF
1
VOUT
COUT
Control
&
2.2 µF
3
Enable
Thermal
2
GND
2
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Product Folder Link(s): REG71055-Q1
REG71055-Q1
www.ti.com....................................................................................................................................................................................................... SBAS477–JULY 2009
ABSOLUTE MAXIMUM RATINGS(1)
VIN
Supply voltage
3 V to 6 V
–0.3 V to VIN
Indefinite
VEN
tSC
Enable input voltage
Output short-circuit duration
Storage temperature range
TSTG
–65°C to 150°C
260°C
TLEAD Lead temperature (soldering, 10 seconds)
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range, TA = –40°C to 85°C
TA = 25°C, VIN = VOUT/2 + 0.75 V, IOUT = 10 mA, CIN = COUT = 2.2 µF, CPUMP = 0.22 µF, and VENABLE = 1.3 V (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
See conditions under Output Voltage with a
resistive load no lower than typical
VOUT/IOUT
Input voltage, tested startup
3.0
5.5
V
I
OUT ≤ 10 mA, 3.0 V ≤ VIN ≤ 5.5 V
OUT ≤ 30 mA, 3.25 V ≤ VIN ≤ 5.5 V
5.2
5.2
30
5.5
5.5
5.8
5.8
V
V
Output voltage
I
Nominal output current
mA
mA
MHz
%
Short-circuit output current(1)
Oscillator frequency(2)
Efficiency(3)
100
1.0
90
IOUT = 10 mA, VIN = 3.0 V
IOUT = 30 mA
Ripple voltage(4)
35
mVPP
V
Logic high input voltage, Enable
Logic low input voltage, Enable
Logic high input current, Enable
Logic low input current, Enable
Thermal shutdown temperature
Thermal shutdown recovery
Quiescent current(5)
VIN = 3.0V to 5.5 V
VIN = 3.0V to 5.5 V
VIN = 3.0V to 5.5 V
VIN = 3.0V to 5.5 V
1.3
VIN
0.4
–0.2
V
100
100
nA
nA
°C
160
140
65
°C
IOUT = 0 mA, VIN = 5.5 V
100
1
µA
µA
°C
Quiescent current in shutdown mode
VIN = 3.0 V to 5.5 V, Enable = 0 V
0.01
Specified ambient temperature
Thermal resistance
TA
–40
85
θJA
TSOT23-6
220
°C/W
(1) The supply current is twice the output short-circuit current.
(2) The converter regulates by enabling and disabling periods of switching cycles. The switching frequency is the oscillator frequency during
an active period.
(3) See efficiency curves for other VIN/VOUT configurations.
(4) Effective series resistance (ESR) of capacitors is < 0.1Ω.
(5) Measured when the device is not switching.
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TYPICAL CHARACTERISTICS
TA = 25°C, VIN = VOUT/2 + 0.75 V, IOUT = 5 mA, CIN = COUT = 2.2 µF, CPUMP = 0.22 µF, and VENABLE = 1.3 V (unless otherwise
noted)
SUPPLY CURRENT vs TEMPERATURE
EFFICIENCY vs VIN
(No Load)
100
80
60
40
20
0
90
80
70
60
50
40
30
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
1.5
2.0
2.5
3.5
4.0
4.5
5.0
5.5
3.0
Temperature (°C)
VIN (V)
Figure 1.
Figure 2.
SUPPLY CURRENT vs TEMPERATURE
(Not Enabled)
LOAD TRANSIENT RESPONSE
20
18
16
14
12
10
8
20mV/div
VOUT
6
10mA/div
4
ILOAD
2
BW = 20MHz
0
Time (10ms/div)
-10
-40 -30 -20
0
10 20 30 40 50 60 70 80 90
Temperature (°C)
Figure 3.
Figure 4.
OUTPUT VOLTAGE vs TEMPERATURE
OUTPUT VOLTAGE DRIFT HISTOGRAM
0.2
25
20
15
10
5
0.1
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
0
20
-40 -20
0
40
60
80
100 120 140
Junction Temperature (°C)
VOUT Drift (ppm/°C)
Figure 5.
Figure 6.
4
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REG71055-Q1
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TYPICAL CHARACTERISTICS (continued)
TA = 25°C, VIN = VOUT/2 + 0.75 V, IOUT = 5 mA, CIN = COUT = 2.2 µF, CPUMP = 0.22 µF, and VENABLE = 1.3 V (unless otherwise
noted)
SHORT-CIRCUIT LOAD CURRENT vs VIN
250
225
200
175
150
125
100
75
50
25
0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VIN (V)
Figure 7.
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SBAS477–JULY 2009....................................................................................................................................................................................................... www.ti.com
THEORY OF OPERATION
The REG71055 regulated charge pump provides a regulated output voltage for input voltages ranging from less
than the output to greater than the output. This is accomplished by automatic mode switching within the device.
When the input voltage is greater than the required output, the unit functions as a variable frequency
switch-mode regulator. This operation is shown in Figure 8. Transistors Q1 and Q3 are held off, Q4 is on, and Q2
is switched as needed to maintain a regulated output voltage.
When the input voltage is less than the required output voltage, the device switches to a step-up or boost mode
of operation, as shown in Figure 9.
A conversion clock of 50% duty cycle is generated. During the first half cycle the FET switches are configured as
shown in Figure 9A, and CPUMP charges to VIN.
During the second half cycle the FET switched are configured as shown in Figure 9B, and the voltage on CPUMP
is added to VIN. The output voltage is regulated by skipping clock cycles as necessary.
Peak Current Reduction
In normal operation, the charging of the pump and output capacitors usually leads to relatively high peak input
currents which can be much higher than that of the average load current. The regulator incorporates circuitry to
limit the input peak current, lowering the total EMI production of the device and lowering output voltage ripple and
input current ripple. Input capacitor (CIN) supplies most of the charge required by input current peaks.
VIN
Q1
Q2
OFF
OFF
SWITCHED
CPUMP
Q3
Q4
ON
CIN
VOUT
COUT
Step-Down (Buck) Mode
Figure 8. Simplified Schematic of the REG71055 Operating in the Step-Down Mode
VIN
VIN
Q2
Q2
Q1
Q1
OFF
ON
ON
ON
OFF
CPUMP
CPUMP
Q3
Q4
Q3
Q4
OFF
ON
OFF
CIN
CIN
VOUT
VOUT
COUT
COUT
Step-Up (Boost) Mode
(A)
(B)
Figure 9. Simplified Schematic of the REG71055 Operating in the Step-Up or Boost Mode
6
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REG71055-Q1
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Protection
The regulator has thermal shutdown circuitry that protects it from damage caused by overload conditions. The
thermal protection circuitry disables the output when the junction temperature reaches approximately 160°C,
allowing the device to cool. When the junction temperature cools to approximately 140°C, the output circuitry is
automatically reenabled. Continuously running the regulator into thermal shutdown can degrade reliability. The
regulator also provides current limit to protect itself and the load.
Shutdown Mode
The EN pin enables the IC when pulled high and places it into energy-saving shutdown mode when pulled low.
When in shutdown mode, the output is disconnected from the input and the quiescent current is reduced to 0.01
µA typical. This shutdown mode functionality is only valid when VIN is above the minimum recommended
operating voltage. The EN pin cannot be left floating and must be actively terminated either high or low.
Capacitor Selection
For minimum output voltage ripple, the output capacitor COUT should be a ceramic, surface-mount type. Tantalum
capacitors generally have a higher effective series resistance (ESR) and may contribute to higher output voltage
ripple. Leaded capacitors also increase ripple due to the higher inductance of the package itself. To achieve best
operation with low input voltage and high load current, the input and pump capacitors (CIN and CPUMP
,
respectively) should also be surface-mount ceramic types. In all cases, X7R or X5R dielectric are recommended.
See the typical operating circuit shown in Figure 10 for component values.
CPUMP
0.22mF
4
6
Enable
3
5
1
VIN
VOUT
REG710
COUT
CIN
2.2mF
2.2mF
GND
2
Figure 10. Typical Operating Circuit
With light loads or higher input voltage, a smaller 0.1µF pump capacitor (CPUMP) and smaller 1µF input and
output capacitors (CIN and COUT, respectively) can be used. To minimize output voltage ripple, increase the
output capacitor, COUT, to 10µF or larger.
The capacitors listed in Table 1 can be used with the REG71055. This table is only a representative list of
compatible parts.
Table 1. Suggested Capacitors
RATED
DIELECTRIC
MATERIAL
PACKAGE
SIZE
WORKING
VOLTAGE
MANUFACTURER
PART NUMBER
C1206C255K8RAC
C1206C224K8RAC
ECJ−2YBOJ225K
ECJ−2VBIC224K
ECJ−2VBIC104
VALUE
2.2 µF
0.22 µF
2.2 µF
0.22 µF
0.1 µF
2.2 µF
0.22 µF
TOLERANCE
±10%
X7R
X7R
X5R
X7R
X7R
X7R
X7R
1206
1206
805
10 V
10 V
6.3 V
16 V
16 V
16 V
25 V
Kemet
±10%
±10%
Panasonic
±10%
805
±10%
805
EMK316BJ225KL
TKM316BJ224KF
±10%
1206
1206
Taiyo Yuden
±10%
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Efficiency
The efficiency of the charge pump regulator varies with the output voltage version, the applied input voltage, the
load current, and the internal operation mode of the device.
The approximate efficiency is given by:
Efficiency (%) = VOUT/(2 ´ VIN) ´ 100
(step-up operating mode)
or
VOUT
´ 100
VIN
(step-down operating mode)
Table 2 lists the approximate values of the input voltage at which the device changes internal operating mode.
See efficiency curves in the Typical Characteristics section for various loads and input voltages.
Table 2. Operating Mode Change vs VIN
PRODUCT
OPERATING MODE CHANGES AT VIN OF
REG71055
Step-up only
Layout
Large transient currents flow in the VIN, VOUT, and GND traces. To minimize both input and output ripple, keep
the capacitors as close as possible to the regulator using short, direct circuit traces.
A suggested printed circuit board (PCB) routing is shown in Figure 11. The trace lengths from the input and
output capacitors have been kept as short as possible.
VENABLE
AREA: < 0.08 sq. inches
VOUT
VIN
COUT
CIN
CP
GND
Figure 11. Suggested PCB Design for Minimum Ripple
8
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APPLICATION CIRCUITS
0.22mF
0.22mF
CP1
CP2
3.3V
3.0V
5.0V
1.8V
VIN
VOUT
VIN
VOUT
REG710-3.3
REG710-3
REG71050
REG710-5
2.2mF
2.2mF
+
2.2mF
VIN
CIN
COUT
-
EN
GND
EN
GND
Figure 12. Circuit for Step-Up Operation From 1.8 V to 5 V With 10-mA Output Current
0.22mF
CP1
VIN
VOUT
VOUT
REG710-3.3
+
4.7mF
4.7mF
COUT
VIN
CIN
GND
-
0.22mF
CP2
VIN
VOUT
REG710-3.3
GND
Figure 13. Circuit for Doubling the Output Current
CPUMP
0.22mF
Enable
REG71050
REG710-5
3.3V to
4.2V
R
R
R
CIN
COUT
2.2mF
2.2mF
GND
LED
LED
LED
Figure 14. Circuit for Driving LEDs
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0.22mF
C-
VIN
C+
VOUT
3.3V
VIN £ VOUT
IL
REG710-3.3
2.2mF
2.2mF
EN
GND
RL
2.2mF
74HC04
5818
5818
-2.7V at 1mA
when IL = 10mA
2.2mF
Figure 15. Negative Bias Supply
10
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PACKAGE OPTION ADDENDUM
www.ti.com
24-Aug-2009
PACKAGING INFORMATION
Orderable Device
Status (1)
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
REG71055IDDCRQ1
ACTIVE
SOT
DDC
6
3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
(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)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF REG71055-Q1 :
Catalog: REG71055
•
NOTE: Qualified Version Definitions:
Catalog - TI's standard catalog product
•
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Jul-2010
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
REG71055IDDCRQ1
SOT
DDC
6
3000
179.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Jul-2010
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SOT DDC
SPQ
Length (mm) Width (mm) Height (mm)
203.0 203.0 35.0
REG71055IDDCRQ1
6
3000
Pack Materials-Page 2
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