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PDF LTC660CS8 Data sheet ( Hoja de datos )
| Número de pieza | LTC660CS8 | |
| Descripción | 100mA CMOS Voltage Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC660
100mA CMOS
Voltage Converter
FEATURES
s Simple Conversion of 5V to – 5V Supply
s Output Drive: 100mA
s ROUT: 6.5Ω (0.65V Loss at 100mA)
s BOOST Pin (Pin 1) for Higher Switching Frequency
s Inverting and Doubling Modes
s Minimum Open Circuit Voltage Conversion
Efficiency: 99%
s Typical Power Conversion Efficiency
with a 100mA Load: 88%
s Easy to Use
U
APPLICATIONS
s Conversion of 5V to ±5V Supplies
s Inexpensive Negative Supplies
s Data Acquisition Systems
s High Current Upgrade to LTC1044 or LTC7660
DESCRIPTION
The LTC®660 is a monolithic CMOS switched-capacitor
voltage converter. It performs supply voltage conversion
from positive to negative from an input range of 1.5V to
5.5V, resulting in complementary output voltages of
– 1.5V to – 5.5V. It also performs a doubling at an input
voltage range of 2.5V to 5.5V, resulting in a doubled
output voltage of 5V to 11V. Only two 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 LTC660 contains an internal oscillator, divide-by-two,
voltage level shifter and four power MOSFETs.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Generating – 5V from 5V
1 BOOST
V+ 8
2 CAP+
OSC 7
+
C1
150µF
3
LTC660
GND
LV
6
4 CAP–
VOUT 5
5V INPUT
–5V
OUTPUT
C2
150µF
660 TA01
Output Voltage vs
Load Current for V+ = 5V
–5.0
TA = 25°C
ROUT = 6.5Ω
–4.8
–4.6
–4.4
–4.2
–4.0
0
20 40 60 80
LOAD CURRENT (mA)
100
660 TA02
1
1 page  
PIN FUNCTIONS
PIN NAME
INVERTER
1
BOOST
Internal Oscillator Frequency Control Pin.
BOOST = Open, fOSC = 10kHz typ;
BOOST = V +, fOSC = 80kHz typ; when OSC is driven
externally BOOST has no effect.
2 CAP + Positive Terminal for Charge Pump Capacitor
3 GND
Power Supply Ground Input
4 CAP – Negative Terminal for Charge Pump Capacitor
5 VOUT
6 LV
Negative Voltage Output
Tie LV to GND when the input voltage is less than 3V.
LV may be connected to GND or left open for input
voltages above 3V. Connect LV to GND when
overdriving OSC.
7 OSC
8 V+
An external capacitor can be connected to this pin to
slow the oscillator frequency. Keep stray capacitance
to a minimum. An external oscillator can be applied
to this pin to overdrive the internal oscillator.
Positive Voltage Input
LTC660
DOUBLER
Same
Same
Positive Voltage Input
Same
Power Supply Ground Input
LV must be tied to VOUT for all input voltages.
Same except standard logic levels will not be able to
overdrive OSC pin.
Positive Voltage Output
TEST CIRCUIT
V+
+ C1
150µF
18
27
3 LTC660 6
45
IS V+
5V
EXTERNAL
OSCILLATOR
COSC
C1
150µF
RL
IL
VOUT
LTC660 • F01
Figure 1. Test Circuit
5
5 Page 
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
LTC660
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
8 765
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
1
0°– 8° TYP
0.053 – 0.069
(1.346 – 1.752)
2
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
34
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
SO8 0996
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.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC660CS8.PDF ] | |
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