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Datasheet LTC3200 PDF ( 特性, スペック, ピン接続図 )

部品番号 LTC3200
部品説明 Regulated Charge Pump DC/DC Converters
メーカ Linear Technology
ロゴ Linear Technology ロゴ 
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LTC3200 Datasheet, LTC3200 PDF,ピン配置, 機能
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LTC3200/LTC3200-5
Low Noise, Regulated
Charge Pump DC/DC Converters
FEATURES
s Low Noise Constant Frequency Operation
s Output Current: 100mA
s Available in 8-Pin MSOP (LTC3200) and Low
Profile (1mm) 6-Pin ThinSOTTM (LTC3200-5)
Packages
s 2MHz Switching Frequency
s Fixed 5V ± 4% Output (LTC3200-5) or ADJ
s VIN Range: 2.7V to 4.5V
s Automatic Soft-Start Reduces Inrush Current
s No Inductors
Us ICC <1µA in Shutdown
APPLICATIO S
s White LED Backlighting
s Li-Ion Battery Backup Supplies
s Local 3V to 5V Conversion
s Smart Card Readers
s PCMCIA Local 5V Supplies
DESCRIPTIO
The LTC®3200/LTC3200-5 are low noise, constant fre-
quency switched capacitor voltage doublers. They pro-
duce a regulated output voltage from a 2.7V to 4.5V input
with up to 100mA of output current. Low external parts
count (one flying capacitor and two small bypass capaci-
tors at VIN and VOUT) make the LTC3200/LTC3200-5
ideally suited for small, battery-powered applications.
A new charge-pump architecture maintains constant
switching frequency to zero load and reduces both output
and input ripple. The LTC3200/LTC3200-5 have thermal
shutdown capability and can survive a continuous short-
circuit from VOUT to GND. Built-in soft-start circuitry
prevents excessive inrush current during start-up.
High switching frequency enables the use of small ceramic
capacitors. A low current shutdown feature disconnects
the load from VIN and reduces quiescent current to <1µA.
The LTC3200 is available in an 8-pin MSOP package and
the LTC3200-5 is available in a 6-pin ThinSOT.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Regulated 5V Output from a 2.7V to 4.5V Input
1µF
VIN
2.7V TO 4.5V
1µF
OFF ON
46
CC+
LTC3200-5
51
VIN VOUT
2
GND
1µF
3
SHDN
VOUT = 5V ±4%
IOUT UP TO 40mA, VIN 2.7V
IOUT UP TO 100mA, VIN 3.1V
ALL CAPACITORS = MURATA GRM 39X5R105K6.3AJ
OR TAIYO YUDEN JMK107BJ105MA
3200-5 TA01
Output Ripple Voltage vs Load Current
40
VIN = 3V
CFLY = 1µF
TA = 25°C
30
COUT = 1µF
20
COUT = 2.2µF
10
0
0 25 50 75 100
OUTPUT CURRENT (mA)
3200 TA02
1

1 Page



LTC3200 pdf, ピン配列
LTC3200/LTC3200-5
TYPICAL PERFOR A CE CHARACTERISTICS (LTC3200-5)
Output Voltage vs Supply Voltage
5.15
CIN = COUT = CFLY = 1µF
IOUT = 20mA
5.10
TA = 85°C
5.05
5.00 TA = 25°C
TA = – 40°C
4.95
4.90
4.85
2.7
3.0 3.3 3.6 3.9 4.2 4.5
SUPPLY VOLTAGE (V)
3200 F01
Oscillator Frequency vs Supply
Voltage
3.0
2.8
2.6
2.4 TA = 25°C
2.2 TA = – 40°C
2.0 TA = 85°C
1.8
1.6
1.4
1.2
1.0
2.7
3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
4.5
3200 G04
Output Voltage vs Load Current
5.2
CIN = COUT = CFLY = 1µF
TA = 25°C
5.1
5.0
VIN = 2.7V
4.9
VIN = 3V
VIN = 3.2V
No Load Supply Current vs Supply
Voltage
6
CIN = COUT = CFLY = 1µF
VSHDN = VIN
5 TA = 25°C
TA = 85°C
4
TA = – 40°C
4.8
0
50 100 150
LOAD CURRENT (mA)
200
3200 G02
VSHDN Threshold Voltage vs
Supply Voltage
1.1
1.0
0.9 TA = – 40°C
TA = 25°C
0.8
TA = 85°C
0.7
0.6
0.5
2.7 3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
4.5
3200 G05
Short Circuit Current vs Supply
Voltage
250
CFLY = 1µF
TA = 25°C
VOUT = 0V
200
3
2.7 3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
4.5
3200 G03
Efficiency vs Load Current
100 CIN = COUT = CFLY = 1µF
90 TA = 25°C
VIN = 2.7V
80
VIN = 3.2V
70
VIN = 3.7V
60
VIN = 4.5V
50
40
30
1 10 100
LOAD CURRENT (mA)
3200 G06
150
100
2.7 3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
4.5
3200 G07
3


3Pages


LTC3200 電子部品, 半導体
LTC3200/LTC3200-5
U
OPERATIO
Operation (Refer to Simplified Block Diagrams)
The LTC3200/LTC3200-5 use a switched capacitor charge
pump to boost VIN to a regulated output voltage. Regula-
tion is achieved by sensing the output voltage through an
internal resistor divider (LTC3200-5) and modulating the
charge pump output current based on the error signal. A
2-phase nonoverlapping clock activates the charge pump
switches. The flying capacitor is charged from VIN on the
first phase of the clock. On the second phase of the clock
it is stacked in series with VIN and connected to VOUT. This
sequence of charging and discharging the flying capacitor
continues at a free running frequency of 2MHz (typ).
In shutdown mode all circuitry is turned off and the
LTC3200/LTC3200-5 draw only leakage current from the
VIN supply. Furthermore, VOUT is disconnected from VIN.
The SHDN pin is a CMOS input with a threshold voltage of
approximately 0.8V. The LTC3200/LTC3200-5 is in shut-
down when a logic low is applied to the SHDN pin. Since
the SHDN pin is a high impedance CMOS input it should
never be allowed to float. To ensure that its state is defined
it must always be driven with a valid logic level.
Short-Circuit/Thermal Protection
The LTC3200/LTC3200-5 have built-in short-circuit current
limiting as well as overtemperature protection. During
short-circuit conditions, they will automatically limit their
output current to approximately 225mA. At higher tempera-
tures, or if the input voltage is high enough to cause exces-
sive self heating on chip, thermal shutdown circuitry will
shut down the charge pump once the junction temperature
exceeds approximately 160°C. It will reenable the charge
pump once the junction temperature drops back to approxi-
mately 155°C. The LTC3200/LTC3200-5 will cycle in and
out of thermal shutdown indefinitely without latch-up or
damage until the short-circuit on VOUT is removed.
Shutdown Current
Since the output voltage can go above the input voltage,
special circuitry is required to control internal logic.
Detection logic will draw an input current of 5µA when the
LTC3200 is in shutdown. However, this current will be
eliminated when the output voltage (VOUT) is at 0V. To
ensure that VOUT is at 0V in shutdown on the adjustable
LTC3200 a bleed resistor may be needed from VOUT to GND.
Typically 10k to 100k is acceptable.
Soft-Start
The LTC3200/LTC3200-5 have built-in soft-start circuitry
to prevent excessive current flow at VIN during start-up.
The soft-start time is preprogrammed to approximately
1ms, so the start-up current will be primarily dependent
upon the output capacitor. The start-up input current can
be calculated with the expression:
ISTARTUP
=
2C OUT
VOUT
1ms
For example, with a 2.2µF output capacitor the start-up
input current of an LTC3200-5 will be approximately
22mA. If the output capacitor is 10µF then the start-up
input current will be about 100mA.
Programming the LTC3200 Output Voltage (FB Pin)
While the LTC3200-5 version has an internal resistive
divider to program the output voltage, the programmable
LTC3200 may be set to an arbitrary voltage via an external
resistive divider. Since it employs a voltage doubling
charge pump, it is not possible to achieve output voltages
greater than twice the available input voltage. Figure 1
shows the required voltage divider connection.
The voltage divider ratio is given by the expression:
R1 = VOUT – 1
R2 1.268V
Typical values for total voltage divider resistance can
range from several ks up to 1M.
8
VOUT
7
FB
4
PGND
SGND 5
( )VOUT
R1
1.268V 1 + R1
R2
COUT
R2
32005 F01
Figure 1. Programming the Adjustable LTC3200
6

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