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LTC1144CS8

Description
Charge Pump STPDN -2V to -18V 50mA Automotive 8-Pin SOIC N
File Size187KB,12 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric View All

LTC1144CS8 Overview

Charge Pump STPDN -2V to -18V 50mA Automotive 8-Pin SOIC N

LTC1144CS8 Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
HTS8542.39.00.01
SVHCYes
SVHC Exceeds ThresholdYes
FunctionStep Down
Process TechnologyCMOS
Output TypeAdjustable
Output Voltage (V)-2 to -18
Minimum Operating Supply Voltage (V)2
Maximum Operating Supply Voltage (V)18
Maximum Supply Current (mA)1.1
Maximum Power Dissipation (mW)500
Output Current (mA)50
Switching Frequency (kHz)10(Typ)
Efficiency (%)93(Typ)
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)70
Supplier Temperature GradeCommercial
Pin Count8
Standard Package NameSOP
Supplier PackageSOIC N
MountingSurface Mount
Package Height1.5(Max)
Package Length5(Max)
Package Width3.99(Max)
PCB changed8
Lead ShapeGull-wing
LTC1144
Switched-Capacitor
Wide Input Range
Voltage Converter
with Shutdown
FeaTures
n
n
n
n
n
n
DescripTion
The
LTC
®
1144
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
+
. The
SHDN
pin reduces supply current to 8µA and can
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.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
n
n
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: 120Ω Maximum
Power Shutdown to 8µA with
SHDN
Pin
Open Circuit Voltage Conversion Efficiency:
99.9% Typical
Power Conversion Efficiency: 93% Typical
Easy to Use
applicaTions
n
n
n
n
n
n
n
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
Typical applicaTion
Generating –15V from 15V
LTC1144
1
BOOST
CAP
+
GND
CAP
V
+
OSC
SHDN
V
OUT
8
7
OUTPUT VOLTAGE (V)
6
5
10µF
1144 TA01
Output Voltage vs Load Current, V
+
= 15V
–15
R
OUT
= 56
T
A
= 25°C
15V INPUT
–14
10µF
+
2
3
4
–15V OUTPUT
–13
+
–12
–11
–10
0
10
30
40
20
LOAD CURRENT (mA)
50
1144 TA02
1144fa
For more information
www.linear.com/LTC1144
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