LTC1144CS8 Linear Technology, LTC1144CS8 Datasheet

IC VOLT CONV SW-CAP W/SHTDN8SOIC

LTC1144CS8

Manufacturer Part Number
LTC1144CS8
Description
IC VOLT CONV SW-CAP W/SHTDN8SOIC
Manufacturer
Linear Technology
Type
Switched Capacitor (Charge Pump), Invertingr
Datasheet

Specifications of LTC1144CS8

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Current - Output
50mA
Frequency - Switching
4kHz ~ 10kHz
Voltage - Input
2 ~ 18 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Power - Output
500mW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Output
-

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1144CS8
Manufacturer:
LINEAR
Quantity:
20 000
Part Number:
LTC1144CS8#PBF
Manufacturer:
LTC
Quantity:
288
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LTC1144CS8#PBF
Manufacturer:
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Quantity:
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Part Number:
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0
FEATURE
A
TYPICAL
PPLICATI
Wide Operating Supply Voltage Range: 2V to 18V
Boost Pin (Pin 1) for Higher Switching Frequency
Simple Conversion of 15V to –15V Supply
Low Output Resistance: 120 Maximum
Power Shutdown to 8 A with SHDN Pin
Open Circuit Voltage Conversion Efficiency:
99.9% Typical
Power Conversion Efficiency: 93% Typical
Easy to Use
Conversion of 15V to 15V Supplies
Inexpensive Negative Supplies
Data Acquisition Systems
High Voltage Upgrade to LTC1044 or 7660
Voltage Division and Multiplications
Automotive Applications
Battery Systems with Wall Adapter/Charger
10 F
+
A
S
O
PPLICATI
Generating –15V from 15V
U
1
2
3
4
S
BOOST
CAP
GND
CAP
LTC1144
+
SHDN
V
OSC
OUT
O
V
+
U
8
7
6
5
15V INPUT
+
10 F
–15V OUTPUT
1144 TA01
D
The LTC1144 is a monolithic CMOS switched-capacitor
voltage converter. It performs supply voltage conversion
from positive to negative from an input range of 2V to 18V,
resulting in complementary output voltages of –2V to
–18V. Only two noncritical external capacitors are needed
for the charge pump and charge reservoir functions.
The converter has an internal oscillator that can be
overdriven by an external clock or slowed down when
connected to a capacitor. The oscillator runs at a 10kHz
frequency when unloaded. A higher frequency outside the
audio band can also be obtained if the Boost Pin is tied to
V
be used to save power when the converter is not in use.
The LTC1144 contains an internal oscillator, divide-by-
two, voltage level shifter, and four power MOSFETs. A
special logic circuit will prevent the power N-channel
switch substrate from turning on.
+
ESCRIPTIO
. The SHDN pin reduces supply current to 8 A and can
Output Voltage vs Load Current, V
–15
–14
–13
–12
–11
–10
Switched-Capacitor
0
Voltage Converter
Wide Input Range
10
U
LOAD CURRENT (mA)
20
with Shutdown
30
R
T
A
OUT
= 25°C
40
= 56
1144 TA02
+
= 15V
LTC1144
50
1

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LTC1144CS8 Summary of contents

Page 1

FEATURE S Wide Operating Supply Voltage Range 18V Boost Pin (Pin 1) for Higher Switching Frequency Simple Conversion of 15V to –15V Supply Low Output Resistance: 120 Maximum Power Shutdown with SHDN Pin Open Circuit ...

Page 2

... TOP VIEW ORDER PART NUMBER + OSC 2 7 LTC1144CN8 SHDN 3 6 LTC1144IN8 OUT N8 PACKAGE 8-LEAD PLASTIC DIP = 110°C, = 100°C/W JA TOP VIEW LTC1144CS8 + LTC1144IS8 2 7 OSC SHDN PART MARKING OUT 1144 S8 PACKAGE 8-LEAD PLASTIC SOIC 1144I = 110°C, = 130°C/W JA LTC1144C ...

Page 3

W U TYPICAL PERFORMANCE CHARACTERISTICS Output Resistance vs Supply Voltage 300 T = 25°C A 250 200 150 100 SUPPLY VOLTAGE (V) LTC1144 • TPC01 Oscillator Frequency as a Function ...

Page 4

LTC1144 W U TYPICAL PERFORMANCE CHARACTERISTICS Power Conversion Efficiency and Supply Current vs Load Current 100 P EFF 25° BOOST = ...

Page 5

TEST CIRCUITS + PPLICATI S I FOR ATIO Theory of Operation To understand the theory of operation of the LTC1144, a review of a basic switched-capacitor building block is helpful. In Figure 2, ...

Page 6

LTC1144 PPLICATI S I FOR ATIO and hence the efficiency, is set by the output impedance. As frequency is decreased, the output impedance will eventually be dominated by the 1/(f C1) term and power efficiency will ...

Page 7

... With a 15V input, the output is 29.45V with no load and 28.18V with a 10mA load. Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. S ...

Page 8

... BSC LT/GP 0494 10K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1994 0.250 ± 0.010 (6.350 ± 0.254) 0.150 – 0.157 (3.810 – 3.988) ...

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