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參數(shù)資料
| 型號(hào)： | LTC3226EUD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, PQCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 431K |
| 代理商： | LTC3226EUD#PBF |
LTC3226
1
3226f
TYPICAL APPLICATION
FEATURES
DESCRIPTION
2-Cell Supercapacitor
Charger with Backup
PowerPath Controller
TheLTC3226isa2-cellseriessupercapacitorchargerwith
a backup PowerPath controller. It includes a charge pump
supercapacitorchargerwithprogrammableoutputvoltage,
a low dropout regulator, and a power-fail comparator for
switching between normal and backup modes.
The constant input current supercapacitor charger is
designed to charge two supercapacitors in series to a
resistor-programmable output voltage from a 2.5V to 5.3V
input supply. The charger input current limit is program-
mable by an external resistor at up to 315mA.
The internal backup LDO is powered from the superca-
pacitors and provides up to 2A peak output current with
an adjustable output voltage. When the input supply falls
below the power-fail threshold, the LTC3226 automatically
enters a backup state in which the supercapacitors power
the output through the LDO. The input supply power-fail
voltagelevelisprogrammedbyanexternalresistordivider.
Low input noise, low quiescent current and a compact
footprintmaketheLTC3226ideallysuitedforsmall,battery-
powered applications. Internal current limit and thermal
shutdown circuitry allow the device to survive a continu-
ous short-circuit from the PROG or CPO pins to ground.
Automatic Normal-to-Backup
Mode Switchover
3.3V Backup Supply
APPLICATIONS
n
1x/2x Multimode Charge Pump Supercapacitor
Charger
n
Automatic Cell Balancing
n
Ideal Diode Main PowerPath Controller
(VIN to VOUT)
n
Internal 2A LDO Backup Supply (CPO to VOUT)
n
Automatic Main/Backup Switchover
n
Input Voltage Range: 2.5V to 5.5V
n
Programmable SCAP Charge Voltage
n
Programmable Input Current Limit (315mA Max)
n
No Load IVIN = 55μA (Typical)
n
Low Profile, 16-Lead 3mm
× 3mm QFN Package
n
Smart Power Meters
n
Battery-Powered Industrial/Medical Equipment
n
3.3V Solid-State Drives
n
Industrial Alarms
n
Data Backup Supplies
n
Battery Hold-Up Supplies
L
, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
1.2V
GATE
MPEXT
VIN
PFI
C+
2.2F
1.96M
C–
PROG
EN_CHG
PFO
RST
CAPGOOD
GND
CHARGE
PUMP
LTC3226
LDO
CPO
5V
VMID
2.2F
VIN
3.3V
1.21M
COUT
47F
TO LOAD
(2A)
33.2k
3.83M
CSC
1.2F
255k
80.6k
1.21M
3226 TA01a
CPO_FB
LDO_FB
VOUT
RST_FB
+
–
TIME (SECONDS)
0
VOLTAGE
(V)
3
4
5
1.6
3226 TA01b
2
1
–1
0.4
0.8
1.2
CPO
2.0
0
6
VOUT
VIN
CSC = 1.2F
COUT = 47F
ILOAD = 2A
PFO (2V/DIV)
BACKUP
MODE
(LDO IN
REGULATION)
BACKUP MODE
(LDO IN
DROPOUT)
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