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參數資料
| 型號： | LTC3625IDE-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封裝： | 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WGED, DFN-12 |
| 文件頁數： | 15/16頁 |
| 文件大?。?/td> | 262K |
| 代理商： | LTC3625IDE-1#TRPBF |
LTC3625/LTC3625-1
3625f
operaTion
TheLTC3625/LTC3625-1aredualcellsupercapacitorchar-
gers. Their unique topology charges two series connected
capacitors to a fixed output voltage with programmable
charging current without overvoltaging either of the cells
—even if they are severely mismatched. No balancing
resistorsarerequired.TheLTC3625/LTC3625-1includean
internal buck converter between VIN and VMID to regulate
the voltage on CBOT (across the bottom capacitor) as well
as an internal boost converter between VMID and VOUT to
regulatethevoltageonCTOP(acrossthetopcapacitor).The
output current of the buck converter is user-programmed
via the PROG pin and the input current of the boost con-
verter is set at 2A (typical).
Table 1 indicates the various functions of the LTC3625/
LTC3625-1 that can be digitally controlled.
Table 1. Digital Input Functions
PIN
VALUE
FUNCTION
CTL*
0
Part runs in 2-inductor application
1
Part runs in 1-inductor application
VSEL
0
4.8V/4.0V sleep threshold
1
5.3V/4.5V sleep threshold
EN
0
Part shuts down, VOUT becomes high
impedance
1
Part enables and regulates the output
*CTL pin must be hard tied to either VIN or GND.
VIN Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors VIN and
keeps the LTC3625/LTC3625-1 disabled until VIN rises
above 2.90V/2.63V (typical) if VSEL is high or 2.63V/2.63V
(typical) if VSEL is low. Hysteresis on the UVLO turns off
the LTC3625/LTC3625-1 if VIN drops by approximately
100mV below the UVLO rising threshold. When in UVLO,
only current needed to detect a valid input will be drawn
from VIN and VOUT.
Buck Converter
The buck converter regulates a user-programmed average
output current given by:
I
h
V
R
BUCK
PROG
=
.
1 2
where hPROG = 118,000 (typical).
The buck converter regulates the current hysteretically by
switching on the buck PMOS until a peak current limit is
reached and then turning on the buck NMOS until a valley
current limit is reached. In the single inductor application
the boost NMOS is used in conjunction with the buck
NMOS to increase efficiency at high currents. The forward
current limit is set to 1.1 IBUCK (typical) and the valley
current limit is set to 0.9 IBUCK (typical). Because of this
methodofregulation,overcurrentlimitandreverse-current
limit protection is automatically provided. The LTC3625/
LTC3625-1 will continue to regulate its programmed cur-
rent even into a grounded output.
InfaultconditionswherethePROGpinisshortedtoground,
orRPROGisconductiveenoughtoprogramIBUCKtooperate
outside of specification, the current out of the PROG pin
will be clamped to 22.5A (typical) and IBUCK will be set to
2.65A (typical). If input current limit is not a concern, the
PROG pin may be grounded to minimize charge times.
Boost Converter
Theboostconverterregulatesafixedaverageinputcurrent
of 2A (typical). The current is regulated hysteretically by
switchingontheboostNMOSuntilthepeakcurrentlimitof
2.12A (typical) is reached, and turning on the boost PMOS
until the valley current limit of 1.88A (typical) is reached.
In the single inductor application the buck NMOS is used
in conjunction with the boost NMOS to increase efficiency.
Becauseofthismethodofregulation,overcurrentlimitand
reverse-current limit protection is automatically provided.
In normal operation VOUT will increase with VMID so VOUT
should never be below VMID. In the case where there is a
reverse voltage on CTOP due to a faulty precondition or a
large load on the output, the boost converter will operate
in trickle charge mode. In this mode the boost PMOS
gate will remain high and instead allow the SW2 node to
increase until SW2 ≈ VMAX + 1V to allow a higher reverse
voltageacrosstheinductor,andthecurrentisrampeddown
to 0mA. This will result in a less efficient charge delivery
throughthePMOS.Tokeepdissipationlow,IPEAKislimited
to 200mA (typical). In this mode the discharge phase is
terminated if it lasts longer than 6.5s (typical).
The boost converter is disabled if VMID falls below the
VMID(GOOD) hysteresis threshold of 1.2V (typical).
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