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LTC1515CS8-3.3/5#PBF

P1-P3P4-P6P7-P8
1
LTC1515 Series
Step-Up/Step-Down
Switched Capacitor DC/DC
Converters with Reset
Daisy-Chained Control Outputs
FEATURES
The LTC
®
1515, LTC1515-3/5 and LTC1515-3.3/5 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
adjustable using an external resistor divider (LTC1515) or
programmable to either 3V/5V (LTC1515-3/5) or 3.3V/5V
(LTC1515-3.3/5) using a logic pin.
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 power-on reset circuit forces the POR pin low
on initial power-up. The POR output remains low until
200ms (typ) after V
OUT
is in regulation.
The parts are short-circuit and overtemperature protected.
Battery life is maximized by very low operating currents
(I
CC
= 60µA typ, I
CC
< 1µA in shutdown). All three parts are
available in an SO-8 package.
DESCRIPTION
U
■
Adjustable/Selectable 3V, 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
■
Very Low Shutdown Current: < 1µA
■
Shutdown Disconnects Load from V
IN
■
V
OUT
Programmable to 3V/5V or 3.3V/5V
■
Short-Circuit and Overtemperature Protected
■
650kHz Switching Frequency
■
Open-Drain Power-On Reset Output
■
Available in SO-8 Package
TYPICAL APPLICATION
U
APPLICATIONS
U
■
SIM Interface in GSM Cellular Telephones
■
Smart Card Readers
■
Local Power Supplies
■
Portable Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
Programmable 3.3V/5V Power Supply with Power-On Reset
SHDN
POR
GND
5/3
V
OUT
V
IN
C1
–
C1
+
LTC1515-3.3/5
1
2
3
4
8
7
6
5
0.22µF
10µF 10µF
V
IN
4-CELL
NiCd
100k
V
OUT
= 3.3V OR 5V
I
OUT
= 50mA
ON OFF
RESET
5V 3.3V
LTC1515 • TA01
++
LTC1515-X 5V Output vs Input Voltage
INPUT VOLTAGE (V)
2
OUTPUT VOLTAGE (V)
10
LT1515 • TA02
4
6
8
3
5
7
9
5.2
5.1
5.0
4.9
4.8
I
OUT
= 10mA
5/3 = 3V
2
LTC1515 Series
ABSOLUTE MAXIMUM RATINGS
W
WW
U
(Note 1)
V
IN
to GND................................................ –0.3V to 12V
V
OUT
to GND ............................................. –0.3V to 12V
SHDN, 5/3, FB 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
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART NUMBER
ORDER PART
NUMBER
S8 PART MARKING
LTC1515CS8-3/5
LTC1515CS8-3.3/5
LTC1515IS8-3/5
LTC1515IS8-3.3/5
151535
515335
515I35
15I335
T
JMAX
= 125°C, θ
JA
= 110°C/W
1
2
3
4
8
7
6
5
TOP VIEW
V
OUT
V
IN
C1
+
C1
–
SHDN
POR
5/3
GND
S8 PACKAGE
8-LEAD PLASTIC SO
LTC1515CS8
LTC1515IS8
S8 PART MARKING
1515
1515I
T
JMAX
= 125°C, θ
JA
= 110°C/W
1
2
3
4
8
7
6
5
TOP VIEW
V
OUT
V
IN
C1
+
C1
–
SHDN
POR
FB
GND
S8 PACKAGE
8-LEAD PLASTIC SO
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
V
IN
= 2V to 10V, SHDN = 3V, C1 = 0.22µF, C
IN
= C
OUT
= 10µF unless otherwise noted (Note 2).
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage V
OUT
= 5V ● 2.7 10 V
V
OUT
= 3V/3.3V ● 2.0 8 V
V
OUT
= ADJ ● 2.0 10 V
V
OUT
= 3V (LTC1515-3/5) 2V ≤ V
IN
≤ 8V, I
OUT
≤ 15mA ● 2.88 3.0 3.12 V
3V ≤ V
IN
≤ 8V, I
OUT
≤ 50mA ● 2.88 3.0 3.12 V
V
OUT
= 3.3V (LTC1515-3.3/5) 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
= 5V (LTC1515-3/5, LTC1515-3.3/5) 2.7V ≤ V
IN
≤ 10V, I
OUT
≤ 15mA ● 4.8 5.0 5.2 V
3.3V ≤ V
IN
≤ 10V, I
OUT
≤ 50mA ● 4.8 5.0 5.2 V
V
FB
Feedback Voltage LTC1515, V
FB
Ramping Negative ● 1.190 1.232 1.275 V
V
FB
Feedback Hysteresis LTC1515 1 %
Effective Output Resistance LTC1515, V
IN
= 3V, Step-Up Mode ● 30 Ω
V
IN
Operating Current V
IN
≤ 5V, I
OUT
= 0, SHDN = 3V ● 60 100 µA
V
IN
> 5V, I
OUT
= 0, SHDN = 3V ● 75 135 µA
V
IN
Shutdown Current SHDN = 0V, V
IN
≤ 5V ● 1 µA
SHDN = 0V, V
IN
> 5V 25 µA
Output Ripple Full Load (Note 2) 100 mV
P-P
Switching Frequency Full Load ● 500 650 800 kHz
5/3, SHDN Input Threshold V
IL
● 0.4 1.0 V
V
IH
● 1.0 1.6 V
5/3, SHDN Input Current 5/3, SHDN = V
IN
● –1 1 µA
5/3, SHDN = 0V ● –1 1 µA
FB Input Current FB = 1.232V ● –50 50 nA
POR Output Low Voltage I
SINK
= 100µA, V
IN
= 3V ● 0.05 0.4 V
3
LTC1515 Series
LTC1515-X 3.3V Output Voltage
vs Input Voltage
INPUT VOLTAGE (V)
0
OPERATING CURRENT (µA)
120
100
80
60
40
20
8
1515 G06
2
4
6
10
85°C
–40°C
25°C
V
OUT
= 5V
I
OUT
= 0mA
LTC1515-X Operating Current
vs Input Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
UW
LTC1515-X
5V Efficiency vs Output Current
OUTPUT CURRENT (mA)
EFFICIENCY (%)
0.01 1 10
1515 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
LTC1515-X 3.3V Output Voltage
Ripple vs Input Voltage
ELECTRICAL CHARACTERISTICS
V
IN
= 2V to 10V, SHDN = 3V, C1 = 0.22µF, C
IN
= C
OUT
= 10µF unless otherwise noted (Note 2).
PARAMETER CONDITIONS MIN TYP MAX UNITS
POR Leakage Current V
POR
= 5V ● –1 1 µA
POR Trip Point (With Respect to V
OUT
)V
OUT
Ramping Negative ● –10 –7.5 –5 %
POR Trip Point Hysteresis 1%
I
OUT
Short-Circuit Current V
OUT
= 0V ● 12 40 mA
t
ON
Soft Start Turn-On Time 4 ms
POR Delay After V
OUT
Above POR Threshold ● 140 200 280 ms
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.
Note 2: For V
IN
≥ 8V, C
OUT
= 22µF.
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE RIPPLE (mV
P-P
)
250
200
150
100
50
0
8
1515 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
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE RIPPLE (mV
P-P
)
250
200
150
100
50
0
8
1515 G04
2
4
6
10
V
OUT
= 5V
I
OUT
= 10mA
T
A
= 25°C
C
OUT
= 10µF
C
OUT
= 47µF
C
OUT
= 22µF
LTC1515-X 5V Output Voltage
Ripple vs Input Voltage
LTC1515-X
3.3V Efficiency vs Output Current
OUTPUT CURRENT (mA)
EFFICIENCY (%)
0.01 1 10
1515 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
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE (V)
3.45
3.40
3.35
3.30
3.25
3.20
8
1515 G05
2
4
6
10
V
OUT
= 3.3V
I
OUT
= 10mA 
C
OUT
= 10µF
T
A
= 25°C
P1-P3P4-P6P7-P8

LTC1515CS8-3.3/5#PBF

Mfr. #:
Buy LTC1515CS8-3.3/5#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Step-up/Stepdn Sw Cap DC/DC w/POR
Lifecycle:
New from this manufacturer.
Delivery:
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