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LTC1682CMS8-3.3 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC1682CMS8-3.3
Description  Doubler Charge Pumps with Low Noise Linear Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1682CMS8-3.3 Datasheet(HTML) 5 Page - Linear Technology

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LTC1682/LTC1682-3.3/LTC1682-5
VOUT (Pin 1): Low Noise Regulated Output Voltage. VOUT
should be bypassed with a
≥2µF low ESR capacitor as
close to the pin as possible for best performance. The VOUT
range is 2.5V to 5.5V.
SHDN (Pin 2): Shutdown Input. A logic low on the SHDN
pin puts the part in shutdown mode. A logic high enables
the part. To continuously enable the part connect SHDN to
VIN. When the part is in shutdown, VOUT will be connected
to ground via a 100
Ω switch and CPO will be high
impedance disconnected from VIN.
FB (Pin 3) (LTC1682): The voltage on this pin is compared
to the internal reference voltage (1.235V) by the error
amplifier to keep the output in regulation. An external
resistor divider is required between VOUT and FB to adjust
the output voltage.
FILT (Pin 3) (LTC1682-3.3/LTC1682-5): This pin is used
to filter the internal voltage reference. Typically a 1nF
capacitor is connected from FILT to ground.
GND (Pin 4): System Ground.
C – (Pin 5): Flying Capacitor Negative Input.
VIN (Pin 6): Input Voltage, 1.8V to 4.4V. VIN should be
bypassed with a
≥2µF low ESR capacitor as close to the
pin as possible for best performance. A minimum capaci-
tance value of 0.1
µF is required.
C+ (Pin 7): Flying Capacitor Positive Input.
CPO (Pin 8): Unregulated Charge Pump Output Voltage.
Approximately 1.95(VIN) at low loads. Bypass with a ≥ 2µF
low ESR capacitor. If a minimum VOUT enable time is
required, the CPO capacitor should be 2
× the VOUT
capacitor.
PIN FUNCTIONS
TEMPERATURE (
°C)
–50
5.030
5.020
5.010
5.000
4.990
3.340
3.330
3.320
3.310
3.300
3.290
1.238
1.240
1.236
1.234
1682 G09
–25
25
50
125
0
75
100
LTC1682
LTC1682-3.3
LTC1682-5
VIN = 3V
IOUT = 10mA
VOUT Voltage vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
OUTPUT CURRENT (mA)
0
4.994
4.993
3.300
4.997
4.996
4.995
5.000
4.999
4.998
15
25
40 45 50
1682 G10
3.299
3.298
3.297
3.296
3.295
3.294
510
20
30 35
VIN = 3.3V
TA = 25°C
LTC1682-5
LTC1682-3.3
VOUT Voltage vs Output Current


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