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LTC1515IS8-3/5 Datasheet

  • LTC1515IS8-3/5

  • Step-Up/Step-Down Switched Capacitor DC/DC Converters with R...

  • 8頁

  • LINER

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LTC1515 Series
Step-Up/Step-Down
Switched Capacitor DC/DC
Converters with Reset
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTION
The LTC
廬
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
鹵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
= 60碌A(chǔ) typ, I
CC
< 1碌A(chǔ) in shutdown). All three parts are
available in an SO-8 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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: 60碌A(chǔ)
Very Low Shutdown Current: < 1碌A(chǔ)
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
Daisy-Chained Control Outputs
Available in SO-8 Package
APPLICATIONS
s
s
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SIM Interface in GSM Cellular Telephones
Smart Card Readers
Local Power Supplies
Portable Equipment
TYPICAL APPLICATION
Programmable 3.3V/5V Power Supply with Power-On Reset
100k
LTC1515-X 5V Output vs Input Voltage
5.2
I
OUT
= 10mA
5/3 = 3V
OUTPUT VOLTAGE (V)
ON OFF
RESET
5V 3.3V
1
2
SHDN
V
OUT
8
V
OUT
= 3.3V OR 5V
I
OUT
= 50mA
5.1
7
POR
V
IN
LTC1515-3.3/5
3
6
5/3
C1
+
4
GND
C1
鈥?/div>
5
0.22碌F
+
10碌F
+
10碌F
V
IN
4-CELL
NiCd
5.0
4.9
LTC1515 鈥?TA01
4.8
2
U
U
U
3
4
5
8
6
7
INPUT VOLTAGE (V)
9
10
LT1515 鈥?TA02
1

LTC1515IS8-3/5 產(chǎn)品屬性

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 降壓（降壓），升壓（升壓），切換電容（充電泵）

  • 固定

  • 1

  • 3V, 5V

  • 2 V ~ 10 V

  • -

  • 650kHz

  • 50mA

  • 無

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-SOIC (0.154", 3.90mm 寬)

  • 管件

  • 8-SOIC

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