REG711EA-5 [TI]
50mA SWITCHED-CAP DC/DC CONVERTER; 50毫安开关CAP DC / DC转换器
| 型号： | REG711EA-5 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 50mA SWITCHED-CAP DC/DC CONVERTER |
| 文件： | 总10页 (文件大小：181K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
REG711
REG711
www.ti.com
50mA SWITCHED-CAP DC/DC CONVERTER
FEATURES
DESCRIPTION
The REG711 is a switched capacitor voltage con-
verter, which produces a regulated, low ripple output
voltage from an unregulated input voltage. A wide
input supply voltage of 1.8V to 5.5V makes the
REG711 ideal for a variety of battery sources, such as
single cell Li-Ion, or two and three cell Nickel or
Alkaline based chemistries.
ꢀ WIDE INPUT RANGE: 1.8V TO 5.5V
5V VERSION: 2.7V TO 5.5V
ꢀ AUTOMATIC STEP-UP/STEP-DOWN
OPERATION
ꢀ LOW INPUT CURRENT RIPPLE
ꢀ LOW OUTPUT VOLTAGE RIPPLE
The input voltage may vary above and below the
output voltage and the output will remain in regula-
tion. It works equally well for step up or down 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 REG711 is thermally
protected and current limited, protecting the load and
the regulator during fault conditions. Typical ground
pin current (quiescent current) is 1mA at full load,
60µA with no load, and less than 1µA in shutdown
mode. This regulator comes in a thin MSOP-8 pack-
age with a component height of less than 1.1mm.
ꢀ MINIMUM NUMBER OF EXTERNAL
COMPONENTS—NO INDUCTORS
ꢀ 1MHz INTERNAL OSCILLATOR ALLOWS
SMALL CAPACITORS
ꢀ “SHUTDOWN” MODE
ꢀꢀTHERMAL AND CURRENT LIMIT
PROTECTION
ꢀ FIVE OUTPUT VOLTAGES AVAILABLE:
5.0V, 3.3V, 3.0V, 2.7V, 2.5V
ꢀꢀTHIN, SMALL PACKAGE: MSOP-8
APPLICATIONS
ꢀꢀSMART CARD READERS
ꢀꢀCELLULAR PHONES
CPUMP
ENABLE
ꢀꢀSIM CARD SUPPLIES
ꢀꢀPORTABLE COMMUNICATION DEVICES
ꢀꢀPERSONAL DIGITAL ASSISTANTS
ꢀꢀMODEMS
+
+
REG711
R
CIN
PGND
COUT
LED
GND
ꢀꢀNOTEBOOK AND PALM-TOP COMPUTERS
ꢀꢀELECTRONIC GAMES
ꢀꢀHANDHELD METERS
ꢀꢀPCMCIA CARDS
ꢀꢀCARD BUSES
ꢀꢀLCD DISPLAYS
Copyright © 2000, Texas Instruments Incorporated
SBVS027A
Printed in U.S.A. February, 2001
SPECIFICATIONS
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C
At TA = +25°C, VIN = VOUT/2 + 0.75V, IOUT = 5mA, CIN = COUT = 2.2µF, CPUMP = 0.22µF, VENABLE = 1.3V, unless otherwise noted(1)
.
REG711EA
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INPUT VOLTAGE
Guaranteed Startup
REG711-5.0
See conditions under “output voltage” with a
resistive load not lower than typical VOUT/IOUT
2.7
1.8
5.5
5.5
V
V
All Other Models
.
OUTPUT VOLTAGE
REG711-5.0
IOUT ≤ 15mA, 2.7V < VIN < 5.5V
IOUT ≤ 50mA, 3.0V < VIN < 5.5V
IOUT ≤ 15mA, 1.8V < VIN < 5.5V
IOUT ≤ 50mA, 2.2V < VIN < 5.5V
IOUT ≤ 15mA, 1.8V < VIN < 5.5V
IOUT ≤ 50mA, 2.2V < VIN < 5.5V
IOUT ≤ 15mA, 1.8V < VIN < 5.5V
IOUT ≤ 50mA, 2.0V < VIN < 5.5V
IOUT ≤ 15mA, 1.8V < VIN < 5.5V
IOUT ≤ 50mA, 2.0V < VIN < 5.5V
4.75
3.14
2.85
2.57
2.38
5.0
3.3
3.0
2.7
2.5
5.25
3.46
3.15
2.83
2.62
V
V
V
V
V
REG711-3.3
REG711-3.0
REG711-2.7
REG711-2.5
OUTPUT CURRENT
Nominal
50
mA
mA
Short Circuit(2)
80
1.0
90
40
OSCILLATOR FREQUENCY
EFFICIENCY(4)
NOTE(3)
IOUT = 15mA, VIN = 2.7V, REG711-5.0
IOUT = 50mA
MHz
%
RIPPLE VOLTAGE(1)
mVp-p
ENABLE CONTROL
VIN = 1.8 to 5.5V
Logic High Input Voltage
Logic Low Input Voltage
Logic High Input Current
Logic Low Input Current
1.3
–0.2
VIN
0.4
100
100
V
V
nA
nA
THERMAL SHUTDOWN
Shutdown temperature
Shutdown recovery
160
140
°C
°C
SUPPLY CURRENT
(quiescent current)
In Shutdown Mode
IOUT = 0mA
VIN = 1.8 to 5.5V, Enable = 0V
60
0.01
100
2
µA
µA
TEMPERATURE RANGE
Specification
Operating
TA
TA
TA
–40
–55
–65
+85
+125
+150
°C
°C
°C
Storage
Thermal Resistance, θJA
MSOP-8
150
°C/W
NOTES: (1) Effective series resistance (ESR) of capacitors is < 0.1Ω. (2) The supply circuit is twice the output short-circuit current. (3) The converter regulates by
enabling and disabling periods of switching cycles. The switching frequency is the oscillator frequency during an active period. (4) See efficiency curves for other
VIN/VOUT configurations.
REG711
2
SBVS027A
PIN CONFIGURATION
SIMPLIFIED BLOCK DIAGRAM
Top View
MSOP
CPUMP
0.22µF
7
6
3
VIN
REG711
CIN
2.2µF
NC
Enable
VIN
1
2
3
4
8
7
6
5
VOUT
8
CPUMP+
CPUMP–
PGND
VOUT
COUT
2.2µF
Control
GND
&
2
Enable
Thermal
PGND
5
4
GND
Simplified Block Diagram
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
mentsrecommendsthatallintegratedcircuitsbehandledwith
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
Supply Voltage................................................................... –0.3V to +5.5V
Enable Input ...........................................................................–0.3V to VIN
Output Short-Circuit Duration ...................................................... Indefinite
Operating Temperature Range....................................... –55°C to +125°C
Storage Temperature Range .......................................... –65°C to +150°C
Junction Temperature ..................................................... –55°C to +150°C
Lead Temperature (soldering, 3s) ................................................. +240°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
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.
PACKAGE/ORDERING INFORMATION
PACKAGE
SPECIFIED
OUTPUT
VOLTAGE
DRAWING
NUMBER
TEMPERATURE
RANGE
PACKAGE
MARKING(1)
ORDERING
NUMBER(2)
TRANSPORT
MEDIA
PRODUCT
PACKAGE
5V Output
REG711EA-5
5.0V
"
"
MSOP-8
337
"
"
–40°C to +85°C
C11B
"
"
REG711EA-5
REG711EA-5/250
REG711EA-5/2K5
Rails
Tape and Reel
Tape and Reel
"
"
"
"
"
"
3.3V Output
REG711EA-3.3
3.3V
"
"
MSOP-8
337
"
"
–40°C to +85°C
C11C
"
"
REG711EA-3.3
REG711EA-3.3/250
REG711EA-3.3/2K5
Rails
Tape and Reel
Tape and Reel
"
"
"
"
"
"
3V Output
REG711EA-3.0
3.0V
"
"
MSOP-8
337
"
"
–40°C to +85°C
C11D
"
"
REG711EA-3
REG711EA-3/250
REG711EA-3/2K5
Rails
Tape and Reel
Tape and Reel
"
"
"
"
"
"
2.7V Output
REG711EA-2.7
2.7V
"
"
MSOP-8
337
"
"
–40°C to +85°C
C11F
"
"
REG711EA-2.7
REG711EA-2.7/250
REG711EA-2.7/2K5
Rails
Tape and Reel
Tape and Reel
"
"
"
"
"
"
2.5V Output
REG711EA-2.5
"
2.5V
"
MSOP-8
337
"
–40°C to +85°C
C11G
"
REG711EA-2.5
REG711EA-2.5/250
Rails
Tape and Reel
"
"
NOTE: (1) Voltage will be marked on reel. (2) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices
per reel). Ordering 2500 pieces of “REG711EA-5/2K5” will get a single 2500-piece Tape and Reel.
REG711
SBVS027A
3
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VIN = VOUT/2 + 0.75V, IOUT = 5mA, CIN = COUT = 2.2µF, CPUMP = 0.22µF, unless otherwise noted.
EFFICIENCY vs LOAD CURRENT
REG711 - 5.0V
EFFICIENCY vs VIN
REG711-5.0
100
80
60
40
20
90
80
70
60
50
40
30
VIN = 2.7V
IOUT = 15mA
VIN = 3.0V
REG711-2.5
REG711-3.3
VIN = VOUT
REG711-3.0
4.5
REG711-2.7
1.5
2
2.5
3
3.5
4
5
5.5
0.1
1
10
100
VIN (V)
Load Current (mA)
EFFICIENCY vs LOAD CURRENT
REG711 - 3.3V
EFFICIENCY vs LOAD CURRENT
REG711 - 3.0V
90
80
70
60
50
40
30
90
80
70
60
50
40
30
VIN = 1.8V
VIN = 1.8V
VIN = 2.2V
VIN = 2.2V
VIN = VOUT
VIN = VOUT
0.1
1
10
100
0.1
1
10
100
Load Current (mA)
Load Current (mA)
EFFICIENCY vs LOAD CURRENT
REG711 - 2.7V
EFFICIENCY vs LOAD CURRENT
REG711 - 2.5V
90
80
70
60
50
40
30
90
80
70
60
50
40
30
VIN = 1.8V
VIN = 1.8V
VIN = 2.0V
VIN = 2.0V
VIN = VOUT
VIN = VOUT
0.1
1
10
100
0.1
1
10
100
Load Current (mA)
Load Current (mA)
REG711
4
SBVS027A
TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C, VIN = VOUT/2 + 0.75V, IOUT = 5mA, CIN = COUT = 2.2µF, CPUMP = 0.22µF, unless otherwise noted.
SHORT-CIRCUIT LOAD CURRENT vs VIN
OUTPUT RIPPLE VOLTAGE
COUT = 2.2µF
250
225
200
175
150
125
100
75
20mV/div
20mV/div
REG711-3.0
IOUT = 15mA
V
IN = 2.4V
COUT = 10µF
50
25
BW = 20MHz
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
2.5µs/div
VIN (V)
MAXIMUM LOAD CURRENT vs INPUT VOLTAGE
A ≤ 85°C
T
OUTPUT RIPPLE VOLTAGE vs VIN
60
50
40
30
20
10
0
60
50
40
30
20
10
0
REG711-5.0
COUT = 2.2µF
REG711-3.0
COUT = 2.2µF
REG711-2.5
OUT = 2.2µF
REG711-2.5
REG711-2.7
REG711-5.0
C
T
A ≤ 80°C
REG711-5.0
REG711-5.0
COUT = 10µF
REG711-2.5
REG711-3.0
REG711-3.3
REG711-3.0
COUT = 10µF
COUT = 10µF
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
1.5
2
2.5
3
3.5
4
4.5
5
5.5
VIN (V)
VIN (V)
OUTPUT RIPPLE VOLTAGE vs VIN
INPUT CURRENT AT TURN-ON
60
50
40
30
20
10
0
REG711-3.3V
IN = 3.0V
IOUT = 50mA
REG711-3.3
V
C
OUT
= 2.2µF
REG711-2.7
C
OUT
= 2.2µF
IIN
100mA/div
2V/div
REG711-3.3
= 10µF
REG711-2.7
VOUT
C
OUT
C
OUT
= 10µF
BW = 20MHz
1.5
2
2.5
3
3.5
VIN (V)
4
4.5
5
5.5
50µs/div
REG711
SBVS027A
5
TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C, VIN = VOUT/2 + 0.75V, IOUT = 5mA, CIN = COUT = 2.2µF, CPUMP = 0.22µF, unless otherwise noted.
SUPPLY CURRENT vs TEMPERATURE (No Load)
LOAD TRANSIENT RESPONSE
100
80
60
40
20
0
IOUT = 0
50mA/div
ILOAD
VOUT
20mV/div
–40 –30 –20 –10
0
10 20 30 40 50 60 70 80 90
10µs/div
Temperature (°C)
SUPPPLY CURRENT vs TEMPERATURE (Not Enabled)
LINE TRANSIENT RESPONSE
20
18
16
14
12
10
8
REG711-3.3
I
LOAD = 50mA
4.5V
3.5V
VIN
2V/div
VOUT
50mV/div
6
4
2
BW = 20MHz
0
–40 –30 –20 –10
0
10 20 30 40 50 60 70 80 90
50µs/div
Temperature (°C)
OUTPUT VOLTAGE VS TEMPERATURE
OUTPUT VOLTAGE DRIFT HISTOGRAM
0.2
0.1
30
25
20
15
10
5
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
0
–40 –20
0
20
40
60
80
100 120 140
–140 –120 –100 –80 –60 –40 –20
VOUT Drift (ppm/°C)
0
20 40 60
Junction Temperature (°C)
REG711
6
SBVS027A
A conversion clock of 50% duty cycle is generated. During
the first half cycle the FET switches are configured as shown
in Figure 2A, and CPUMP charges to VIN. During the second
half cycle the FET switches are configured as shown in
Figure 2B, and the voltage on CPUMP is added to VIN. The
output voltage is regulated by skipping clock cycles as
necessary.
THEORY OF OPERATION
The REG711 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 pulse-width switch-mode regulator. This opera-
tion is shown in Figure 1. Transistors Q1 and Q3 are held off,
Q4 is on, and Q2 is switched as needed to maintain a
regulated output voltage.
PEAK CURRENT REDUCTION
In normal operation, the charging of the pump and output
capacitors usually leads to relatively high peak input cur-
rents 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
Q3
Q2
Q4
OFF
OFF
SWITCHED
CPUMP
PROTECTION
CIN
ON
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 de-
vice to cool. When the junction temperature cools to ap-
proximately 140°C, the output circuitry is automatically re-
enabled. Continuously running the regulator into thermal
shutdown can degrade reliability. The regulator also pro-
vides current limit to protect itself and the load.
VOUT
COUT
Step-Down (Buck) Mode
FIGURE 1. Simplified Schematic of the REG711 Operating
in the Step-Down Mode.
SHUTDOWN MODE
A control pin on the regulator can be used to place the device
into an energy-saving shutdown mode. In this mode, the
output is disconnected from the input as long as VIN is
greater than or equal to minimum VIN and the input quies-
cent current is reduced to 2µA maximum.
When the input voltage is less than the required output
voltage, the device switched to a step-up or boost mode of
operation, as shown in Figure 2.
VIN
VIN
Q1
Q3
Q2
Q4
Q1
Q3
Q2
Q4
OFF
ON
ON
ON
OFF
CPUMP
CPUMP
– +
–
+
OFF
CIN
OFF
CIN
ON
VOUT
VOUT
COUT
COUT
(A)
(B)
Step-Up (Boost) Mode
FIGURE 2. Simplified Schematic of the REG711 Operating in the Step-Up or Boost Mode.
REG711
SBVS027A
7
CAPACITOR SELECTION
The approximate efficiency is given by:
For minimum output voltage ripple, the output capacitor
COUT should be a ceramic, surface-mount type. Tantalum
capacitors generally have a higher Effective Series Resis-
tance (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, 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 3 for component values.
Efficiency (%) = VOUT/(2 • VIN) •100 (step-up operating mode)
or
VOUT • 100/VIN (step-down operating mode)
Table II lists the approximate values of the input voltage at
which the device changes internal operating mode.
OPERATING MODE
PRODUCT
CHANGES AT VIN OF
REG711-2.5
REG711-2.7
REG711-3.0
REG711-3.3
REG711-5.0
> 3.2V
> 3.4V
> 3.7V
> 4.0V
CPUMP
0.22µF
Step-up only
TABLE II.
7
6
ENABLE
CIN
2
3
8
See efficiency curves in the Typical Performance Curves
section for various loads and input voltages.
VIN
VOUT
REG711
COUT
2.2µF
2.2µF
LAYOUT
5
4
GND
PGND
Large ripple currents flow in the VIN, PGND and VOUT
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 PCB routing is shown in Figure 4. The trace
lengths from the input and output capacitors have been kept
as short as possible. A star ground system has been imple-
mented, with pin 5 as the center of the star. No ground plane
is provided in other layers, as this will provide capacitive
coupling for noise spikes.
FIGURE 3. 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 capaci-
tor, COUT, to 10µF or larger.
The capacitors listed in Table I have been used with the
REG711. This is only a representative list of those parts that
are compatible, and not the results of a complete survey of
an industry-wide offering.
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.
NOTE: All Capacitors 1206 Size
FIGURE 4. Suggested PCB Design for Minimum Ripple.
RATED
DIELECTRIC
MATERIAL
PACKAGE
SIZE
WORKING
VOLTAGE
MANUFACTURER
PART NUMBER
VALUE
TOLERANCE
Kemet
C1206C255K8RAC
C1206C224K8RAC
ECJ3YB1A225K
ECJ3VB1C224K
LMK325BJ106KN
EMK316BJ225KL
TKM316BJ224KF
2.2µF
0.22µF
2.2µF
0.22µF
10µF
±10%
±10%
±10%
±10%
±10%
±10%
±10%
X7R
X7R
X7R
X7R
X5R
X7R
X7R
1206
1206
1206
1206
1210
1206
1206
10V
10V
10V
16V
10V
16V
25V
Panasonic
Taiyo Yuden
2.2µF
0.22µF
TABLE I. Capacitors That Have Been Successfully Used With The REG711.
REG711
8
SBVS027A
PACKAGE OPTION ADDENDUM
www.ti.com
3-Oct-2003
PACKAGING INFORMATION
ORDERABLE DEVICE
STATUS(1)
PACKAGE TYPE
PACKAGE DRAWING
PINS
PACKAGE QTY
REG711EA-2.5/250
REG711EA-2.5/2K5
REG711EA-2.7/250
REG711EA-2.7/2K5
REG711EA-3.3/250
REG711EA-3.3/2K5
REG711EA-3/250
REG711EA-3/2K5
REG711EA-5/250
REG711EA-5/2K5
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
DGK
DGK
DGK
DGK
DGK
DGK
DGK
DGK
DGK
DGK
8
8
8
8
8
8
8
8
8
8
250
2500
250
2500
250
2500
250
2500
250
2500
(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.
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enhancements, improvements, and other changes to its products and services at any time and to discontinue
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accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
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