LTC3225EDDB#TRMPBF

LTC3225/LTC3225-1
1
3225fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
150mA Supercapacitor
Charger
The LTC
®
3225/LTC3225-1 are programmable supercapaci-
tor chargers designed to charge two supercapacitors in
series to a selectable fi xed output voltage (4.8V/5.3V for
the LTC3225 and 4V/4.5V for the LTC3225-1) from input
supplies as low as 2.8V to 5.5V. Automatic cell balancing
prevents overvoltage damage to either supercapacitor. No
balancing resistors are required.
Low input noise, low quiescent current and low external
parts count (one fl ying capacitor, one bypass capacitor at
V
IN
and one programming resistor) make the LTC3225/
LTC3225-1 ideally suited for small battery-powered
applications.
Charge current level is programmed with an external
resistor. When the input supply is removed, the LTC3225/
LTC3225-1 automatically enter a low current state, drawing
less than 1A from the supercapacitors.
The LTC3225/LTC3225-1 are available in a 10-lead 2mm
× 3mm DFN package.
n
Low Noise Constant Frequency Charging of Two
Series Supercapacitors
n
Automatic Cell Balancing Prevents Capacitor
Overvoltage During Charging
n
Programmable Charge Current (Up to 150mA)
n
Selectable 2.4V or 2.65V Regulation per Cell
(LTC3225)
n
Selectable 2V or 2.25V Regulation per Cell
(LTC3225-1)
n
Automatic Recharge
n
I
VIN
= 20µA in Standby Mode
n
I
COUT
< 1µA When Input Supply is Removed
n
No Inductors
n
Tiny Application Circuit (2mm × 3mm DFN Package,
All Components <1mm High)
n
Current Limited Applications with High Peak Power
Loads (LED Flash, PCMCIA Tx Bursts, HDD Bursts,
GPRS/GSM Transmitter)
n
Backup Supplies
Charging Profi le with 30% Mismatch
in Output Capacitance, C
TOP
< C
BOT
L, LT, LTC and LTM are registered trademarks and ThinSOT is a trademark of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
V
IN
C
+
C
SHDN
V
SEL
ON/OFF
OUTPUT
PROGRAMMING
C
OUT
CX
GND
PGOOD
PROG
LTC3225
LTC3225-1
100k
0.6F
0.6F
12k
3225 TA01a
F
2.2µF
V
OUT
4.8V/5.3V (LTC3225)
4V/4.5V (LTC3225-1)
V
IN
2.8V/3V TO 5.5V
SHDN
5V/DIV
V
COUT
2V/DIV
V
TOP
-V
BOT
200mV/DIV
I
VIN
300mA/DIV
5 SEC/DIV
3225 TA01b
LTC3225
V
SEL
= V
IN
R
PROG
= 12k
C
TOP
= 1.1F
C
BOT
= 1.43F
C
TOP
INITIAL VOLTAGE = 0V
C
BOT
INITIAL VOLTAGE = 0V
LTC3225/LTC3225-1
2
3225fb
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
V
IN
, C
OUT
to GND ......................................... –0.3V to 6V
SHDN, V
SEL
...................................... –0.3V to V
IN
+ 0.3V
C
OUT
Short-Circuit Duration ............................. Indefi nite
I
VIN
Continuous (Note 2) ......................................350mA
I
OUT
Continuous (Note 2) .....................................175mA
Operating Temperature Range (Note 3).... –40°C to 85°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
TOP VIEW
11
DDB PACKAGE
10-LEAD (3mm s 2mm) PLASTIC DFN
C
+
C
CX
SHDN
PGOOD
C
OUT
V
IN
GND
PROG
V
SEL
6
8
7
9
10
5
4
2
3
1
T
JMAX
= 125°C, θ
JA
= 76°C/W
EXPOSED PAD (PIN 11) MUST BE SOLDERED TO
LOW IMPEDANCE GND PLANE (PIN 8) ON PCB
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LTC3225
V
IN-UVLO
Input Supply Undervoltage Lockout
High-to-Low Threshold
V
SEL
= V
IN
V
SEL
= 0
l
l
2.65
2.4
2.75
2.5
2.85
2.6
V
V
V
IN-UVLO-HYS
Input Supply Undervoltage Lockout
Hysteresis
V
SEL
= V
IN
V
SEL
= 0
150
140
mV
mV
V
IN
Input Voltage Range V
SEL
= V
IN
V
SEL
= 0V
l
l
3
2.8
5.5
5.5
V
V
V
COUT
Charge Termination Voltage
Sleep Mode Threshold (Rising Edge)
V
SEL
= V
IN
V
SEL
= 0V
l
l
5.2
4.7
5.3
4.8
5.4
4.9
V
V
V
COUT-HYS
Output Comparator Hysteresis 100 mV
V
TOP/BOT
Maximum Voltage Across Each of the
Supercapacitors After Charging
V
SEL
= V
IN
V
SEL
= 0V
l
l
2.75
2.5
V
V
LTC3225-1
V
IN-UVLO
Input Supply Undervoltage Lockout
High-to-Low Threshold
V
SEL
= V
IN
V
SEL
= 0
l
l
2.25
2.0
2.35
2.1
2.45
2.2
V
V
V
IN-UVLO-HYS
Input Supply Undervoltage Lockout
Hysteresis
V
SEL
= V
IN
V
SEL
= 0
150
140
mV
mV
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, C
IN
= 2.2μF, C
FLY
= 1μF, unless otherwise specifi ed (Note 3).
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3225EDDB#TRMPBF LTC3225EDDB#TRPBF LCYR
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3225EDDB-1#TRMPBF LTC3225EDDB-1#TRPBF LFFS
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
TRM = 500 pieces.
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
LTC3225/LTC3225-1
3
3225fb
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range V
SEL
= V
IN
V
SEL
= 0
l
l
2.8
2.8
5.5
5.5
V
V
V
COUT
Charge Termination Voltage
Sleep Mode Threshold (Rising Edge)
V
SEL
= V
IN
V
SEL
= 0
l
l
4.4
3.9
4.5
4.0
4.6
4.1
V
V
V
COUT-HYS
Output Comparator Hysteresis 100 mV
V
TOP/BOT
Maximum Voltage Across Each of the
Supercapacitors After Charging
V
SEL
= V
IN
V
SEL
= 0
l
l
2.35
2.1
V
V
LTC3225/LTC3225-1
I
Q-VIN
No Load Operating Current at V
IN
I
OUT
= 0mA
l
20 40 µA
I
SHDN-VIN
Shutdown Current SHDN = 0V, V
OUT
= 0V
l
0.1 1 µA
I
COUT
C
OUT
Leakage Current V
OUT
= 5.6V, SHDN = 0V
V
OUT
= 5.6V, Charge Pump in Sleep Mode
V
OUT
= 5.6V, SHDN Connected to V
IN
with
Input Supply Removed
l
l
1
2
3
4
1
µA
µA
µA
I
VIN
Input Charge Current V
IN
= 3.6V, R
PROG
= 12k, C
TOP
= C
BOT
306 mA
V
IN
= 3.6V, R
PROG
= 60k, C
TOP
= C
BOT
55 mA
I
OUT
Output Charge Current V
IN
= 3.6V, R
PROG
= 12k, C
TOP
= C
BOT
,
V
OUT
= 4.5V (LTC3225),
V
OUT
= 3.7V (LTC3225-1)
125 150 175 mA
V
IN
= 3.6V, R
PROG
= 60k, C
TOP
= C
BOT
,
V
OUT
= 4.5V (LTC3225),
V
OUT
= 3.7V (LTC3225-1)
26 mA
V
PGOOD
PGOOD Low Output Voltage I
PGOOD
= –1.6mA
l
0.4 V
I
PGOOD-LEAK
PGOOD High Impedance Leakage Current V
PGOOD
= 5V
l
10 µA
V
PG
PGOOD Low-to-High Threshold Relative to Output Voltage Threshold
l
92 94 96 %
V
PG-HYS
PGOOD Threshold Hysteresis Relative to Output Voltage Threshold
l
0.25 1.2 2.5 %
R
OL
Effective Open-Loop Output Impedance
(Note 4)
V
IN
= 3.6V, V
OUT
= 4.5V (LTC3225)
V
IN
= 3.6V, V
OUT
= 3.7V (LTC3225-1)
8
9
Ω
f
OSC
CLK Frequency
l
0.6 0.9 1.5 MHz
V
SEL
, SHDN
V
IH
Input High Voltage
l
1.3 V
V
IL
Input Low Voltage
l
0.4 V
I
IH
Input High Current
l
–1 1 µA
I
IL
Input Low Current
l
–1 1 µA
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, C
IN
= 2.2μF, C
FLY
= 1μF, unless otherwise specifi ed (Note 3).
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Based on long-term current density limitations.
Note 3: The LTC3225/LTC3225-1 are tested under pulsed load conditions
such that T
J
≈ T
A
. The LTC3225/LTC3225-1 are guaranteed to meet
performance specifi cations from 0°C to 85°C. Specifi cations over the
–40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 4: Output not in regulation;
R
OL
(2 • V
IN
– V
OUT
)/I
OUT

LTC3225EDDB#TRMPBF

Mfr. #:
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management Specialized - PMIC 150mA Supercapacitor Charger
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union