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參數(shù)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(shù)： | 16/16頁 |
| 文件大小： | 262K |
| 代理商： | LTC3625IDE-1#TRPBF |
LTC3625/LTC3625-1
3625f
operaTion
Single Inductor Operation
With the CTL pin tied to VIN the LTC3625/LTC3625-1 will
operate in single inductor mode. In this mode the same
inductor serves in the power path for both the buck and
the boost converters. Thus, the buck converter and boost
converter will never run simultaneously.
Under certain conditions with a single inductor, a small
amountofcurrentcanflowfromthesupercapacitorstoVIN
when the boost charger is active. A 25mA load is required
on VIN to prevent the VIN supply from being pumped to
a higher voltage while the boost is active. This minimum
load is not needed in the two inductor application and it
is also not needed when the charger is disabled.
Atypicalchargecycleforafullydischargedcapacitorstack
will proceed as follows:
1. The buck converter will turn on and regulate its output
current ramping hysteretically between 1.1 IBUCK and
0.9 IBUCK until the VMID(GOOD) threshold is met (1.35V
typical).
2. Once the VMID(GOOD) threshold is reached, the boost
converter will turn on and regulate its input current
ramping hysteretically between 2.12A and 1.88A until
VMID falls below the VMID(GOOD) hysteresis threshold
(1.2V typical).
3. Phases 1 and 2 will alternate until VOUTisapproximately
2.4V.WhenVTOP(equaltoVOUT–VMID)isapproximately
50mV > VMID, the boost regulator will turn off and the
buck regulator will turn on. Likewise, when VMID is
approximately 50mV > VTOP, the boost regulator will
turn on and the buck regulator will turn off.
4. Phase 3 will continue until VOUT has reached its pro-
grammed output voltage. Once this happens, the part
will enter sleep mode and only minimal power will be
consumed (see the Electrical Characteristics table).
5. Ifthesupercapacitors’selfdischargeoranexternalload
cause the output to drop by more than 135mV (typical),
then the LTC3625/LTC3625-1 will exit sleep mode and
begin charging the appropriate supercapacitor.
In all cases whenever either of the converters is shut
down, it will switch to its appropriate discharge phase
(NMOS on for the buck and PMOS on for the boost) until
the inductor current reaches 0mA. This optimizes charge
delivery to the output capacitors.
Charge time is dependant on the programmed buck output
current as well as the value of the supercapacitors being
charged.Forestimatingchargeprofilesinthesingleinduc-
torapplication,seetheTypicalPerformanceCharacteristics
graph Charge Time vs RPROG.
The effective average VOUT referred charge current can
be approximated as:
I
A
I
A
CHARGE
BUCK
BOOST
BUCK
+
0 5
2
.
ε
where
εBOOST is the boost converter efficiency, which is
typically about 85% (see the Typical Performance Char-
acteristics graph Boost Efficiency vs VTOP).
Seen another way, this is the maximum steady-state load
the part can support without losing VOUT regulation.
Dual Inductor Operation
With the CTL pin tied to GND, the LTC3625/LTC3625-1
will operate in dual inductor mode. In this mode two
inductors will serve as the power path for the buck and
the boost converters. This will allow both the buck and
the boost converter to run simultaneously. As a result, the
total charge time will be greatly reduced at the cost of an
additional board component.
Atypicalchargecycleforafullydischargedcapacitorstack
will proceed as follows:
1. The buck converter will turn on and regulate its output
current ramping hysteretically between 1.1 IBUCK
and 0.9 IBUCK until the VMID(GOOD) threshold is met
(1.35V typical).
2. Once the VMID(GOOD) threshold is reached, the boost
converter will turn on and regulate its input current
ramping hysteretically between 2.12A and 1.88A. The
buck converter will continue to run at the same time. In
some cases (IBUCK ~ <1A) the boost converter’s input
current will exceed the current delivered to CBOT; even
though the buck converter is running, charge will be
removed and VMID may decrease. Thus, if VMID falls
below the VMID(GOOD) hysteresis threshold, the boost
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