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LTC3226IUD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3226
1
3226fa
TYPICAL APPLICATION
FEATURES DESCRIPTION
2-Cell Supercapacitor
Charger with Backup
PowerPath Controller
The LTC
®
3226 is a 2-cell series supercapacitor charger with
a backup PowerPath controller. It includes a charge pump
supercapacitor charger with programmable output voltage,
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 of 2.5V to 5.3V.
The charger input current limit is programmable 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
voltage level is programmed by an external resistor divider.
Low input noise, low quiescent current and a compact
footprint make the LTC3226 ideally suited for small, 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
(V
IN
to V
OUT
)
n
Internal 2A LDO Backup Supply (CPO to V
OUT
)
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 I
VIN
= 55A (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
V
IN
V
IN
PFI
C
+
2.2µF
1.96M
C
–
PROG
EN_CHG
PFO
RST
CAPGOOD
GND
CHARGE
PUMP
LTC3226
LDO
CPO
5V
VMID
2.2µF
V
IN
3.3V
1.21M
C
OUT
47µF
TO LOAD
(2A)
33.2k
3.83M
C
SC
1.2F
255k
80.6k
1.21M
3226 TA01a
CPO_FB
LDO_FB
V
OUT
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
V
OUT
V
IN
C
SC
= 1.2F
C
OUT
= 47µF
I
LOAD
= 2A
PFO (2V/DIV)
BACKUP
MODE
(LDO IN
REGULATION)
BACKUP MODE
(LDO IN
DROPOUT)
LTC3226
2
3226fa
ABSOLUTE MAXIMUM RATINGS
V
IN
, V
OUT
, VMID, CPO, RST, PFO,
CAPGOOD, LDO_FB ..................................... –0.3V to 6V
EN_CHG, PFI, RST_FB,
CPO_FB Voltage ............–0.3V to Max (V
IN
, CPO) + 0.3V
Operating Junction Temperature Range
(Note 3) ...................................................... –40 to 125°C
Storage Temperature Range ......................–65 to 150°C
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3226EUD#PBF LTC3226EUD#TRPBF LFZV
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3226IUD#PBF LTC3226IUD#TRPBF LFZV
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
PIN CONFIGURATION
16 15 14 13
5 6 7 8
TOP VIEW
17
GND
UD PACKAGE
16-LEAD (3mm w 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1V
OUT
PFO
PFI
LDO_FB
C
–
CAPGOOD
CPO_FB
PROG
CPO
C
+
VMID
V
IN
GATE
RST_FB
RST
EN_CHG
T
JMAX
= 125°C, θ
JA
= 58.7°C/W (NOTE 2)
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
LTC3226
3
3226fa
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 3). V
IN
= 3.3V, V
CPO
= 5V, V
OUT
= 3.3V, VMID = 1/2 V
CPO
unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Supply Range
l
2.5 5.5 V
I
VIN(ST)
V
IN
Quiescent Current in Normal Mode V
PFI
> 1.2V, V
CPO_FB
> 1.2V, V
IN
< V
CPO
10 µA
I
CPO(ST)
CPO Quiescent Current in Normal Mode V
PFI
> 1.2V, V
CPO_FB
> 1.2V, V
IN
< V
CPO
20 µA
I
VOUT(ST)
V
OUT
Quiescent Current in Normal Mode V
OUT
= V
IN
, V
PFI
> 1.2V, V
CPO_FB
> 1.2V,
V
IN
< V
CPO
5µA
I
CPO(BU)
CPO Quiescent Current in Backup Mode V
PFI
< 1.2V, V
LDO_FB
> 0.8V, V
CPO
> V
OUT
24 µA
I
VOUT(BU)
V
OUT
Quiescent Current in Backup Mode V
IN
= 0V, V
PFI
< 1.2V, V
LDO_FB
> 0.8V,
V
CPO
> V
OUT
3µA
Ideal Diode Controller
V
FWD(EDA)
External Ideal Diode Forward Voltage (V
IN
-V
OUT
)I
VOUT
= 2mA 15 mV
V
RTO
Fast Turn-Off Voltage (V
IN
-V
OUT
)V
IN
Falling –45 mV
Fast Turn-On Voltage (V
IN
-V
OUT
)V
OUT
Falling 45 mV
Charge Pump Supercapacitor Charger
V
CPO_FB
CPO_FB Pin Threshold for Entering Sleep Mode
l
1.18 1.21 1.24 V
CPO_FB Pin Hysteresis for Exiting Sleep Mode 20 mV
I
CPO_FB
Charge Pump FB Pin Input Leakage V
CPO_FB
= 1.3V
l
–50 50 nA
f
OSC
CLK Frequency 0.75 0.9 1.05 MHz
R
OL
Effective Open-Loop Output Impedance (Note 4) V
CPO
= 4.5V, C
FLY
= 1µF 6
V
PROG
PROG Pin Servo Voltage V
CPO_FB
< 1.2V
l
0.98 1.0 1.02 V
I
VIN(ILIM)
Input Current Limit R
PROG
= 33.3k, V
CPO
= 0V 360 mA
h
PROG
Ratio of V
IN
Input Current Limit to PROG Pin
Current
R
PROG
= 33.3k, V
CPO
= 0V 10,500 A/A
I
CHRG(1x)
CPO Pin Charging Current (1x Mode) V
IN
= 3.8V, R
PROG
= 33.3k, V
CPO
= 3V 315 mA
I
CHRG(2x)
CPO Pin Charging Current (2x Mode) R
PROG
= 33.3k 157.5 mA
I
SC
Short-Circuit Charge Current PROG Pin Grounded, V
CPO
= 0V 600 mA
V
MODE
V
IN
to CPO Voltage Differential for Switching
Mode from 1x to 2x
200 mV
1x/2x Mode Comparator Hysteresis 120 mV
V
CLAMP
Maximum Voltage Across Either Supercapacitor
After Charging
l
2.65 2.75 V
V
STACK
Maximum Supercapacitor Stack Voltage
l
5.3 5.5 V
VMID VMID Output Voltage 2.5 V
VMID Current Sourcing Capability VMID < V
CPO
/2, V
CPO_FB
> 1.24V 4.5 mA
VMID Current Sinking Capability VMID > V
CPO
/2, V
CPO_FB
> 1.24V 5.5 mA
CPO_FB Pin Threshold Voltage (Rising) for
CAPGOOD
l
1.09 1.11 1.13 V
CPO_FB Pin Hysteresis for CAPGOOD 20 mV
CAPGOOD Output Low Voltage I
SINK
= 5mA 65 mV
CAPGOOD High Impedance Leakage Current V
CAPGOOD
= 5V
l
1µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3226IUD#TRPBF

Mfr. #:
Buy LTC3226IUD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management Specialized - PMIC 2-Cell Supercapacitor Charger with Backup PowerPath controller
Lifecycle:
New from this manufacturer.
Delivery:
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