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LTC1514CS8-3.3#PBF

P1-P3P4-P6P7-P8
1
LTC1514-3.3/LTC1514-5
Step-Up/Step-Down Switched
Capacitor DC/DC Converters
with Low-Battery Comparator
■
3.3V or 5V Output Voltages
■
2V to 10V Input Voltage Range
■
Up to 50mA Output Current
■
Only Three External Capacitors Required
■
Soft Start Limits Inrush Current at Turn-On
■
Low Operating Current: 60µA
■
Low Shutdown Current: 10µA
■
Shutdown Disconnects Load from V
IN
■
Short-Circuit and Overtemperature Protected
■
650kHz Switching Frequency
■
Low-Battery Comparator Active in Shutdown
■
Available in SO-8 Package
FEATURES
DESCRIPTION
U
The LTC
®
1514-3.3/LTC1514-5 are micropower switched
capacitor DC/DC converters that produce a regulated
output voltage by either stepping up or stepping down
the input voltage. Output voltage is fixed at either 3.3V
(LTC1514-3.3) or 5V (LTC1514-5) by an internal resistor
divider.
A unique architecture allows the parts to accommodate
a wide input voltage range (2V to 10V) while maintaining
±4% regulation. Additional circuitry prevents excessive
inrush current and output voltage ripple when large V
IN
to V
OUT
differentials are present.
An internal uncommitted comparator is kept active in
shutdown. The comparator has an open-drain output for
flexible interfacing.
The parts are short-circuit and overtemperature pro-
tected. Battery life is maximized by very low operating
currents (I
CC
= 60µA typ, 10µA in shutdown). Both parts
are available in an SO-8 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIONS
U
■
Battery-Operated Equipment
■
Smart Card Readers
■
Local Power Supplies
■
Handheld Instruments
■
Battery Backup Supplies
INPUT VOLTAGE (V)
2
OUTPUT VOLTAGE (V)
10
LT1514 • TA02
4
6
8
3
5
7
9
5.2
5.1
5.0
4.9
4.8
I
OUT
= 10mA
TYPICAL APPLICATION
U
1
2
3
4
8
7
6
5
SHDN
LBO
LBI
GND
V
OUT
V
IN
C1
+
C1
–
LTC1514-5
100k
V
OUT
= 5V
I
OUT
= 50mA
0.22µF
10µF
10µF
V
IN
4-CELL
NiCd
1.33M
1%
499k
1%
ON OFF
LOW BAT
1514 TA01
+
+
5V Step-Up/Step-Down Power Supply with Low-Battery Detect
LTC1514-5 Output Voltage
vs Input Voltage
2
LTC1514-3.3/LTC1514-5
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
S8 PART MARKING
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life of
the device may be impaired.
LTC1514CS8-3.3
LTC1514CS8-5
LTC1514IS8-3.3
LTC1514IS8-5
15143
15145
1514I3
1514I5
Consult factory for Military grade parts.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage LTC1514-3.3 ● 2.0 8 V
LTC1514-5
● 2.7 10 V
V
OUT
(LTC1514-3.3) 2V ≤ V
IN
≤ 8V, I
OUT
≤ 15mA ● 3.17 3.3 3.43 V
3V ≤ V
IN
≤ 8V, I
OUT
≤ 50mA ● 3.17 3.3 3.43 V
V
OUT
(LTC1514-5) 2.7V ≤ V
IN
≤ 10V, I
OUT
≤ 15mA ● 4.8 5 5.2 V
3.3V ≤ V
IN
≤ 10V, I
OUT
≤ 50mA ● 4.8 5 5.2 V
V
IN
Operating Current V
IN
≤ 5V, I
OUT
= 0, SHDN = 3V ● 60 100 µA
V
IN
> 5V, I
OUT
= 0, SHDN = 3V ● 75 120 µA
V
IN
Shutdown Current SHDN = 0V, V
IN
≤ 5V ● 10 20 µA
SHDN = 0V, V
IN
> 5V 35 µA
Output Ripple Full Load (Note 2) 100 mV
P-P
Switching Frequency ● 500 650 800 kHz
LBI Trip Point LBI Ramping Negative ● 1.110 1.145 1.180 V
LBI Trip Point Hysteresis 1%
LBI Input Current LBI = 1.145V ● –50 50 nA
LBO V
OL
I
SINK
= 100µA, V
IN
= 3V ● 0.025 0.4 V
LBO Leakage Current V
LBO
= 5V, LBI = V
IN
● –1 1 µA
SHDN Input Threshold V
IL
● 0.4 1 V
V
IH
● 1 1.6 V
SHDN Input Current SHDN = V
IN
● –1 1 µA
SHDN = 0V
● –1 1 µA
I
OUT
Short-Circuit Current V
OUT
= 0V ● 12 40 mA
t
ON
Soft Start Turn-On Time 4 ms
V
IN
= 2V to 10V, SHDN = 3V, C1 = 0.22µF, C
IN
= C
OUT
= 10µF, unless otherwise noted (Note 2).
ELECTRICAL CHARACTERISTICS
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
SHDN
LBO
LBI
GND
V
OUT
V
IN
C1
+
C1
–
T
JMAX
= 125°C, θ
JA
= 110°C/ W
Note 2: For V
IN
≥ 8V, C
OUT
= 22µF.
(Note 1)
V
IN
to GND................................................ –0.3V to 12V
V
OUT
to GND ............................................. –0.3V to 12V
SHDN, LBI, LBO to GND ........................... –0.3V to 12V
V
OUT
Short-Circuit Duration............................. Indefinite
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Industrial ........................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
3
LTC1514-3.3/LTC1514-5
TYPICAL PERFORMANCE CHARACTERISTICS
UW
LTC1514-3.3
Efficiency vs Output Current
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE RIPPLE (mV
P-P
)
250
200
150
100
50
0
8
1514 G03
2
4
6
10
V
OUT
= 3.3V
I
OUT
= 10mA
T
A
= 25°C
C
OUT
= 10µF
C
OUT
= 22µF
C
OUT
= 47µF
LTC1514-3.3 Output Voltage
Ripple vs Input Voltage
OUTPUT CURRENT (mA)
EFFICIENCY (%)
0.01 1 10
1514 G02
0.1 100
100
80
60
40
20
0
V
OUT
= 5V
T
A
= 25°C
V
IN
= 8V
V
IN
= 3.3V
V
IN
= 6V
V
IN
= 2.7V
LTC1514-5
Efficiency vs Output Current
OUTPUT CURRENT (mA)
EFFICIENCY (%)
0.01 1 10
1514 G01
0.1 100
100
80
60
40
20
0
V
OUT
= 3.3V
T
A
= 25°C
V
IN
= 2V
V
IN
= 4.4V
V
IN
= 2.7V
V
IN
= 6V
LTC1514-5 Output Voltage Ripple
vs Input Voltage
LTC1514-5 Operating Current
vs Input Voltage
LTC1514-3.3 Output Voltage
vs Input Voltage
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE RIPPLE (mV
P-P
)
250
200
150
100
50
0
8
1514 G04
2
4
6
10
V
OUT
= 5V
I
OUT
= 10mA
T
A
= 25°C
C
OUT
= 10µF
C
OUT
= 47µF
C
OUT
= 22µF
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE (V)
3.45
3.40
3.35
3.30
3.25
3.20
8
1514 G05
2
4
6
10
V
OUT
= 3.3V
C
OUT
= 10µF
T
A
= 25°C
INPUT VOLTAGE (V)
0
OPERATING CURRENT (µA)
120
100
80
60
40
20
8
1514 G06
2
4
6
10
85°C
–40°C
25°C
V
OUT
= 5V
I
OUT
= 0mA
LTC1514-5
Efficiency vs Input Voltage
INPUT VOLTAGE (V)
0
EFFICIENCY (%)
100
80
60
40
20
8
1514 G07
2
4
6
10
V
OUT
= 3.3V
I
OUT
= 10mA
T
A
= 25°C
INPUT VOLTAGE (V)
2
EFFICIENCY (%)
100
80
60
40
20
10
1514 G08
4
6
8
12
V
OUT
= 5V
I
OUT
= 10mA
T
A
= 25°C
LTC1514-3.3
Efficiency vs Input Voltage
LTC1514-X Shutdown Supply
Current vs Input Voltage
INPUT VOLTAGE (V)
0
SHUTDOWN SUPPLY CURRENT (µA)
25
20
15
10
5
0
8
1514 G09
2
4
6
10
85°C
–40°C
SHDN = 0V
25°C
P1-P3P4-P6P7-P8

LTC1514CS8-3.3#PBF

Mfr. #:
Buy LTC1514CS8-3.3#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Boost/Buck Switched Cap DC/DC Convs w/ L
Lifecycle:
New from this manufacturer.
Delivery:
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