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Datasheet LTC3203B-1 PDF ( 特性, スペック, ピン接続図 )

部品番号 LTC3203B-1
部品説明 500mA Output Current Low Noise Dual Mode Step-Up Charge Pumps
メーカ Linear
ロゴ Linear ロゴ 
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LTC3203B-1 Datasheet, LTC3203B-1 PDF,ピン配置, 機能
FEATURES
Selectable Dual Mode Operation: 1:1.5 or 1:2
High Output Current: Up to 500mA
Low Noise Constant Frequency (1MHz/0.9MHz)
Operation*
VIN Range: 2.7V to 5.5V
Adjustable Output Voltage (LTC3203/LTC3203B)
User Selectable Fixed Output Voltages: 4.5V or 5V
(LTC3203-1 and LTC3203B-1)
Burst Mode® Operation with
IQ ~ 120µA (LTC3203/LTC3203-1)
Constant Freqency Operation at All Loads
(LTC3203B/LTC3203B-1)
Soft-Start Limits Inrush Current at Turn-On
Short-Circuit/Thermal Protection
Shutdown Disconnects Load from Input
Shutdown Current: < 1µA
Available in a 10-pin (3mm × 3mm) DFN Package
U
APPLICATIO S
High Current LED Backlight Supply for
Cellphones/PDAs
Cellphone Camera Light Supply
General Purpose 3.3V or Li-Ion to 5V Supply
USB ON THE GO(OTG) Devices
LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
500mA Output Current
Low Noise Dual Mode
Step-Up Charge Pumps
DESCRIPTIO
The LTC®3203/LTC3203-1/LTC3203B/LTC3203B-1 are low
noise, high efficiency charge pump DC/DC converters
capable of driving loads up to 500mA from a 2.7V to 5.5V
input. Low external parts count (two flying capacitors and
bypass capacitors at VIN and VOUT) make the LTC3203
family ideally suited for small, battery-powered applica-
tions.
Built-in soft-start circuitry prevents excessive inrush
current during start-up. High switching frequency enables
the use of small external capacitors. The LTC3203/
LTC3203-1 feature Burst Mode operation at light load to
achieve high efficiency whereas the LTC3203B/
LTC3203B-1 operate at constant frequency to achieve
lowest noise operation.
The LTC3203-1/LTC3203B-1 have a user selectable fixed
output voltage of 4.5V or 5V to power LEDs or logic
circuits. The FB pin of the LTC3203/LTC3203B can be used
to program the desired output voltage. The parts are short-
circuit and overtemperature protected and are available in
a low profile (3mm × 3mm) DFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents including 6411531.
TYPICAL APPLICATIO
VIN
2.2µF
ON/OFF
R1*
100k
2.2µF
SHDN VSEL
LTC3203-1
VIN VOUT
C1+ C2+
C1– C2–
MODE GND
IOUT(MAX)
300mA
300mA
500mA
500mA
VSEL
LOW
HIGH
LOW
HIGH
VOUT
4.5V
5V
4.5V
5V
*R1
316k
357k
357k
402k
OUTPUT PROGRAMMING
2.2µF
VOUT
500mA
10µF
3203 F02
Efficiency vs VIN at 300mA Load Current
100
90
80
VOUT = 5V
70
VOUT = 4.5V
60
50
40
30
20
10
0
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
3203 G05
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LTC3203B-1 pdf, ピン配列
LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full specified temperature
range, otherwise specifications are at 25°C. VIN = 3.6V, C1 = C2 = 2.2µF unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
LTC3203-1/LTC3203B-1
VOUT
4.5V Output Voltage Range
(VSEL = 0V) (Note 5)
5V Output Voltage Range
(VSEL = VIN) (Note 5)
VIN > 3.1V, IOUT < 500mA
VIN > 2.9V, IOUT < 350mA
VIN > 2.7V, IOUT < 250mA
VIN > 3.1V, IOUT < 500mA
VIN > 3.1V, IOUT < 400mA
VIN > 2.7V, IOUT < 150mA
4.32 4.5 4.68
4.32 4.5 4.68
4.32 4.5 4.68
4.8 5 5.2
4.8 5 5.2
4.8 5 5.2
V
V
V
V
V
V
VOUT/IOUT
ICC
VVSELH
VVSELL
IVSELH
VOUT Load Regulation
VIN = 3.6V, IOUT = 100mA to 500mA, 2x Mode,
VIN = 4V, IOUT = 100mA to 500mA, 1.5x Mode
0.37 mV/mA
0.27 mV/mA
No Load Operating Current
(LTC3203-1)
IOUT = 0mA, 2x Mode
IOUT = 0mA, 1.5x Mode
120 300
100 300
µA
µA
No Load Operating Current
(LTC3203B-1)
IOUT = 0mA, 2x Mode
IOUT = 0mA, 1.5x Mode
9 mA
7 mA
VSEL Input High Voltage
1.3
V
VSEL Input Low Voltage
0.4 V
VSEL Input High Current
–1
1 µA
IVSELL
VSEL Input Low Current
LTC3203/LTC3203B
–1
1 µA
VFB
Feedback Servo Voltage
IOUT = 0mA, 2.7V VIN 5.5V
0.88 0.91 0.94
V
IFB
VFB/IOUT
FB Input Current
Load Regulation
(Refer to FB Pin)
VFB = 0.95V
IOUT = 100mA to 500mA, 2x Mode, VIN = 3.6V
IOUT = 100mA to 500mA, 1.5x Mode, VIN = 4V
–50
0.08
0.06
50 nA
mV/mA
mV/mA
ICC
No Load Operating Current
IOUT = 0mA, 2x Mode, 5V VOUT Setting
(LTC3203)
IOUT = 0mA, 1.5x Mode, 5V VOUT Setting
120 300
100 300
µA
µA
No Load Operating Current
(LTC3203B)
IOUT = 0mA, 2x Mode, 5V VOUT Setting
IOUT = 0mA, 1.5x Mode, 5V VOUT Setting
9 mA
7 mA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Based on long-term current density limitations.
Note 3: The LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 are guaranteed
to meet performance specifications from 0°C to 85°C. Specifications over
the –40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 4: Output not in regulation (based on wafer sort):
ROL (2 VIN – VOUT)/IOUT, 2x Mode
ROL (1.5 VIN – VOUT)/IOUT, 1.5x Mode
Note 5: Proper conversion mode, 1.5x or 2x, has to be chosen based on
ROL to ensure output regulation.
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LTC3203B-1 電子部品, 半導体
LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
PI FU CTIO S
C2+ (Pin 1): Flying Capacitor 2 Positive Terminal (C2).
VOUT (Pin 2): Regulated Output Voltage. VOUT should be
bypassed with a low ESR ceramic capacitor as close to the
pin as possible for best performance. The capacitor should
have greater than 4.7µF capacitance under all conditions.
C1+ (Pin 3): Flying Capacitor 1 Positive Terminal (C1).
SHDN (Pin 4): Active Low Shutdown Input. A low on SHDN
puts the LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 in
low current shutdown mode. Do not float the SHDN pin.
VSEL (Pin 5) (LTC3203-1/LTC3203B-1): Output Voltage
Selection Input. A logic 0 at VSEL sets the regulated VOUT
to 4.5V; and a logic 1 sets the regulated VOUT to 5V. Do not
float the VSEL pin.
FB (Pin 5) (LTC3203/LTC3203B): Feedback. The voltage
on this pin is compared to the internal reference voltage
(0.91V) by the error amplifier to keep the output in
regulation. An external resistor divider is required
between VOUT and FB to program the output voltage.
MODE (Pin 6): Mode Selection Input. The LTC3203/
LTC3203-1/LTC3203B/LTC3203B-1 operates in 1.5x
mode if the MODE pin is greater than VMODEH, which
gives higher charge pump efficiency. If the MODE pin is
less than VMODEL, the LTC3203/LTC3203-1/LTC3203B/
LTC3203B-1 operates in 2x mode, which gives a higher
charge pump boost voltage.
VIN (Pin 7): Input Supply Voltage. VIN should be bypassed
with a more than 2.2µF low ESR ceramic capacitor to GND.
C2(Pin 8): Flying Capacitor 2 Negative Terminal (C2).
GND (Pin 9): Ground. This pin should be connected
directly to a low impedance ground plane.
C1(Pin 10): Flying Capacitor 1 Negative Terminal (C1).
Exposed Pad (Pin 11): Ground. This pin must be sol-
dered to the PCB for electrical contact and rated thermal
performance.
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