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| 型號(hào)： | LTC3225EDDB-1#TRMPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.175 A SWITCHED CAPACITOR CONVERTER, 1500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-10 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大?。?/td> | 263K |
| 代理商： | LTC3225EDDB-1#TRMPBF |
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LTC3225/LTC3225-1
5
3225fb
PIN FUNCTIONS
C+ (Pin 1): Flying Capacitor Positive Terminal. A 1μF X5R
or X7R ceramic capacitor should be connected from C+
to C–.
C– (Pin 2):
Flying Capacitor Negative Terminal.
CX (Pin 3): Midpoint of Two Series Supercapacitors. This
pin voltage is monitored and forced to track COUT (CX =
COUT/2) during charging to achieve voltage balancing of
the top and bottom supercapacitors.
SHDN(Pin4):ActiveLowShutdownInput.AlowonSHDN
puts the LTC3225/LTC3225-1 in low current shutdown
mode. Do not oat the SHDN pin.
PGOOD (Pin 5): Open-Drain Output Status Indicator. Upon
start-up, this open-drain pin remains low until the output
voltage, VOUT, is within 6% (typical) of its nal value. Once
VOUT is valid, PGOOD becomes Hi-Z. If VOUT falls 7.2%
(typical) below its correct regulation level, PGOOD is
pulled low. PGOOD may be pulled up through an external
resistor to an appropriate reference level. This pin is Hi-Z
in shutdown mode.
VSEL (Pin 6): Output Voltage Selection Input. A logic
low at VSEL sets the regulated COUT to 4.8V (LTC3225)
or 4V (LTC3225-1); a logic high sets the regulated COUT
to 5.3V (LTC3225) or 4.5V (LTC3225-1). Do not oat the
VSEL pin.
PROG (Pin 7): Charge Current Programming Pin. A resis-
tor connected between this pin and GND sets the charge
current. (See Applications Information section).
GND (Pin 8, Exposed Pad Pin 11): Charge Pump Ground.
These pins must be soldered directly to PCB ground. The
exposed pad must be soldered to a low impedance PCB
ground for rated thermal performance.
VIN (Pin 9): Power Supply for the LTC3225/LTC3225-1.
VIN should be bypassed to GND with a low ESR ceramic
capacitor of more than 2.2μF.
COUT (Pin 10): Charge Pump Output Pin. Connect COUT to
the top plate of the top supercapacitor. COUTprovidescharge
current to the supercapacitors and regulates the nal volt-
age to 4.8V/5.3V (LTC3225) or 4V/4.5V (LTC3225-1).
Charging Prole with Unequal
Initial Output Capacitor Voltage
(Initial VTOP = 1V, VBOT = 1.3V)
SHDN
5V/DIV
VCOUT
2V/DIV
VTOP-VBOT
500mV/DIV
IVIN
300mA/DIV
2 SEC/DIV
3225 G10
LTC3225
VSEL = VIN
RPROG = 12k
CTOP = CBOT = 1.1F
CTOP INITIAL VOLTAGE = 1V
CBOT INITIAL VOLTAGE = 1.3V
SHDN
5V/DIV
VCOUT
2V/DIV
VTOP-VBOT
200mV/DIV
IVIN
300mA/DIV
5 SEC/DIV
3225 G11
LTC3225
VSEL = VIN
RPROG = 12k
CTOP = 1.43F
CBOT = 1.1F
CTOP INITIAL VOLTAGE = 0V
CBOT INITIAL VOLTAGE = 0V
SHDN
5V/DIV
VCOUT
2V/DIV
VTOP-VBOT
200mV/DIV
IVIN
300mA/DIV
5 SEC/DIV
3225 G12
LTC3225
VSEL = VIN
RPROG = 12k
CTOP = 1.1F
CBOT = 1.43F
CTOP INITIAL VOLTAGE = 0V
CBOT INITIAL VOLTAGE = 0V
Charging Prole with 30%
Mismatch in Output Capacitance
(CTOP > CBOT)
Charging Prole with 30%
Mismatch in Output Capacitance
(CTOP < CBOT)
TYPICAL PERFORMANCE CHARACTERISTICS
(TA = 25°C, CFLY = 1μF, CIN = 2.2μF, CTOP = CBOT, unless otherwise specied)
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| LTC3225EDDB-TRMPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:150mA Supercapacitor Charger |
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