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LTC3552EDHC-1#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC3552-1
1
35521fa
Standalone Linear Li-Ion
Battery Charger and Dual
Synchronous Buck Converter
The LTC
®
3552-1 is a complete constant-current/constant-
voltage linear charger and dual fi xed output DC/DC con-
verter for single cell lithium-ion batteries. Its DFN package
and low external component count make the LTC3552-1
ideally suited for portable applications. Furthermore,
the LTC3552-1 is designed to work within USB power
specifi cations.
No external sense resistor or external blocking diode are
required due to the internal MOSFET architecture. The
charge voltage is fi xed at 4.2V and the charge current is
programmed with a resistor. The charge cycle terminates
when the charge current drops below the programmed
termination threshold after the fi nal fl oat voltage is
reached. When the input supply (wall adapter or USB
supply) is removed, the LTC3552-1 enters a low current
state dropping the battery drain current to less than 2µA.
Thermal regulation maximizes charge rate without risk
of overheating.
The synchronous step-down switching regulators
generate fi xed output voltages of 1.8V and 1.575V.
The switching frequency is set at 2.25MHz, allowing the
use of small surface mount inductors and capacitors.
■
Cellular Telephones, PDAs, MP3 Players
■
Bluetooth Applications
■
Programmable Charge Current Up to 950mA
■
Complete Linear Charger and Dual DC/DC
Regulator
■
Dual Fixed Outputs:
1.8V at 800mA
1.575V at 400mA
■
No MOSFET, Sense Resistor or Blocking Diode
Required
■
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
■
Charges Directly from a USB Port
■
Programmable Charge Current Termination
■
Preset 4.2V Charge Voltage with ±1% Accuracy
■
Charge Current Monitor Output for Gas Gauging*
■
Automatic Recharge
■
Charge Status Output
■
“Power Present” Output
■
Soft-Start Limits Inrush Current
■
Low Quiescent Current Buck Converter (40µA)
■
Current Mode Operation, Constant Frequency (2.25MHz)
■
Low Profi le (5mm × 3mm × 0.75mm) DFN Package
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Single Cell Li-Ion Battery Charger with
C/5 Termination and Dual DC/DC Converter
V
IN
4.5V TO
6.5V
V
OUT2
1.575V/
400mA
V
OUT1
1.8V/
800mA
35521 TA01
LTC3552-1
V
IN
GND
C
OUT2
10µF
CER
C
OUT1
10µF
CER
ITERM
PROG
SW2
V
OUT2
RUN1
RUN2
BAT
V
CC
SW1
V
OUT1
800mA
V
FB2
V
FB1
C
FF2
330pF
C
FF1
330pF
4.7µH
1µF
10µF
2.2µH
CHRG
PWR
EN
619Ω
1.24k
+
4.2V
1-CELL
Li-Ion
BATTERY
LOAD CURRENT (mA)
1
80
EFFICIENCY (%)
POWER LOSS (mW)
90
100
10 100 1000
35521 TAO1b
70
75
85
95
65
60
10
100
1000
1
0.1
CHANNEL 1
CHANNEL 2
V
OUT2
= 1.575V
V
OUT1
= 1.8V
V
IN
= 3.6V
Burst Mode OPERATION
Effi ciency Curve/
Power Loss of Regulators
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6522118, 6700364, 5481178, 6580258, 6304066,
6127815, 6498466, 6611131.
LTC3552-1
2
35521fa
Input Supply Voltage (V
IN
) ......................... –0.3V to 10V
PROG, ITERM .................................. –0.3V to V
IN
+ 0.3V
BAT .............................................................. –0.3V to 7V
CHRG
,
PWR
,
EN
....................................... –0.3V to 10V
BAT Short-Circuit Duration ............................Continuous
BAT Pin Current ..........................................................1A
PROG Pin Current ....................................................1mA
V
CC
Supply Voltage ...................................... –0.3V to 6V
V
OUT1
, V
OUT2
, RUN1,
RUN2 Voltages .............................–0.3V to V
CC
+0.3V
V
FB1
, V
FB2
........................................–0.3V to V
CC
+ 0.3V
SW1, SW2 Voltage ...........................–0.3V to V
CC
+ 0.3V
Ambient Operating Temperature
Range (Note 2) .................................... –40°C to 85°C
Maximum Junction Temperature (Note 8) ............ 125°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
The
● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 5V, V
CC
= 3.6V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Battery Charger
V
IN
Input Supply Voltage
●
4.25 8 V
I
IN
Input Supply Current
Charge Mode (Note 4)
Standby Mode
Shutdown Mode
R
PROG
= 10k
Charge Terminated
EN = 5V, V
IN
< V
BAT
or V
IN
< V
UV
●
●
●
0.4
200
25
1
500
50
mA
µA
µA
V
FLOAT
Regulated Output (Float) Voltage 0°C ≤ T
A
≤ 85°C, 4.3V < V
IN
< 8V
4.158 4.2 4.242 µA
I
BAT
BAT Pin Current R
PROG
= 10k, Current Mode
R
PROG
= 2k, Current Mode
Standby Mode, V
BAT
= 4.2V
Shutdown Mode (EN = 5V, V
IN
< V
BAT
or
V
IN
< V
UV
)
Sleep Mode, V
IN
= 0V
●
●
●
92
465
100
500
–2.5
±1
±1
105
535
–6
±2
±2
mA
mA
µA
µA
µA
V
UV
V
IN
Undervoltage Lockout Voltage From V
IN
Low to High
●
3.7 3.8 3.92 V
V
UVHYS
V
IN
Undervoltage Lockout Hysteresis
●
150 200 300 mV
V
EN
(IL)
EN
Pin Input Low Voltage
●
0.4 0.7 V
V
EN
(IH)
EN
Pin Input High Voltage
●
0.7 1 V
R
EN
EN
Pin Pull-Down Resistor
●
1.2 2 5
ΜΩ
V
ASD
V
IN
– V
BAT
Lockout Threshold Voltage V
IN
from Low to High
V
IN
from High to Low
70
5
100
30
140
50
mV
mV
I
TERM
Charge Termination Current Threshold R
TERM
= 1k
R
TERM
= 5k
●
●
90
17.5
100
20
110
22.5
mA
mA
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
16
15
14
13
12
11
10
9
17
1
2
3
4
5
6
7
8
EN
PWR
V
IN
PROG
SW1
V
CC
V
OUT1
V
FB1
ITERM
BAT
CHRG
RUN2
SW2
RUN1
V
OUT2
V
FB2
TOP VIEW
DHC PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
T
JMAX
= 125°C, θ
JA
= 40°C/W (Note 3)
EXPOSED PAD IS GROUND (PIN 17) MUST BE SOLDERED TO PCB
ORDER PART NUMBER DHC PART MARKING
LTC3552EDHC-1 35521
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
LTC3552-1
3
35521fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
PROG
PROG Pin Voltage R
PROG
= 10k, Current Mode 0.93 1 1.07 V
V
CHRG
CHRG
Pin Output Low Voltage I
CHRG
= 5mA 0.35 0.6 V
V
PWR
PWR
Pin Output Low Voltage I
PWR
= 5mA 0.35 0.6 V
ΔV
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
, 0°C < T
A
< 85°C 60 100 140 mV
T
LIM
Junction Temperature in Constant-
Temperature Mode
120 °C
R
ON-CHRG
Charger’s Power FET “ON” Resistance
(Between V
IN
and BAT)
600 mΩ
t
SS-CHRG
Charger Soft-Start Time I
BAT
= 0 to I
BAT
= 1000V/R
PROG
100 µs
t
RECHRG
Recharge Comparator Filter Time V
BAT
High to Low 0.75 2 4.5 ms
t
TERM
Termination Comparator Filter Time I
BAT
Drops Below Charge Termination
Threshold
0.4 1 2.5 ms
Switching Regulator
V
CC
Operating Voltage Range for Converter
●
2.5 5.5 V
V
OUT1
Output Voltage Feedback of Regulator 1 0°C ≤ T
A
≤ 85°C (Note 5)
–40°C ≤ T
A
≤ 85°C (Note 5)
●
1.764
1.755
1.8
1.8
1.836
1.836
V
V
V
OUT2
Output Voltage Feedback of Regulator 2 0°C ≤ T
A
≤ 85°C (Note 5)
–40°C ≤ T
A
≤ 85°C (Note 5)
●
1.544
1.536
1.575
1.575
1.607
1.607
V
V
ΔV
LINE_REG
Reference Voltage Line Regulation V
CC
= 2.5V to 5.5V (Note 5) 0.3 0.5 %/V
ΔV
LOAD_REG
Output Voltage Load Regulation (Note 5) 0.5 %
I
S
Input DC Supply Current (Note 6)
Active Mode
Sleep Mode
Shutdown
V
OUT1
= 1.5V, V
OUT2
= 1.3V
V
OUT1
= 1.89V, V
OUT2
= 1.65V
RUN = 0V, V
CC
= 5.5V
700
40
0.1
950
60
1
µA
µA
µA
f
OSC
Oscillator Frequency V
OUT1
= 1.8V, V
OUT2
= 1.575V
●
1.8 2.25 2.7 MHz
I
LIM
Peak Switch Current Limit Regulator 1
Peak Switch Current Limit Regulator 2
V
CC
= 3V, Duty Cycle < 35%
V
CC
= 3V, Duty Cycle < 35%
0.95
0.6
1.2
0.7
1.6
0.9
A
A
R
DS(ON)
Converter Top Switch On-Resistance
Converter Bottom Switch On-Resistance
(Note 7)
(Note 7)
0.35
0.3
0.45
0.45
Ω
Ω
I
SW(LKG)
Switch Leakage Current V
CC
= 5V, V
RUN
= 0V, V
FB
= 0V 0.01 1 µA
V
RUN
RUN Threshold Voltage
●
0.3 1 1.5 V
I
RUN
RUN Leakage Current
●
0.01 1 µA
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 5V, V
CC
= 3.6V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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: The LTC3552E-1 is 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 3: Failure to solder the exposed backside of the package to the PC
board will result in a thermal resistance much higher than 40°C/W. See
Thermal Considerations.
Note 4: Supply current includes PROG pin current and ITERM pin current
(approximately 100µA each) but does not include any current delivered to
the battery through the BAT pin (approximately 100mA).
Note 5: The converter is tested in a proprietary test mode that connects
the output of the error amplifi er to the SW pin, which is connected to an
external servo loop.
Note 6: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 7: The regulator power switch on-resistances are guaranteed by
correlation to wafer level measurements.
Note 8: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• θ
JA
)
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LTC3552EDHC-1#PBF

Mfr. #:
Buy LTC3552EDHC-1#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Standalone Linear Li-Ion Battery Charger & Dual Synch Buck Converters
Lifecycle:
New from this manufacturer.
Delivery:
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