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LTC3552EDHC#TRPBF

Description
Linear Battery Charger Li-Ion/Li-Pol 950mA 4.2V 16-Pin DFN EP T/R
CategoryBattery management   
File Size308KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3552EDHC#TRPBF Overview

Linear Battery Charger Li-Ion/Li-Pol 950mA 4.2V 16-Pin DFN EP T/R

LTC3552EDHC#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
TypeLinear Battery Charger
Battery TypeLi-Ion|Li-Pol
Maximum Supply Current (mA)1
Minimum Operating Supply Voltage (V)4.25
Maximum Operating Supply Voltage (V)8
Output Voltage (V)4.2
Output Current (mA)950(Max)
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
Pin Count16
Standard Package NameDFN
Supplier PackageDFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length5
Package Width3
PCB changed16
Lead ShapeNo Lead
FEATURES
LTC3552
Standalone Linear Li-Ion
Battery Charger and Dual
Synchronous Buck Converter
DESCRIPTIO
The LTC
®
3552 is a complete constant-current/constant-
voltage linear charger with a dual DC/DC converter for
single cell lithium-ion batteries. Its DFN package and low
external component count make the LTC3552 ideally suited
for portable applications. Furthermore, the LTC3552 is
designed to work within USB power specifications.
No external sense resistor or external blocking diode is
required due to the internal MOSFET architecture. The
charge voltage is fixed 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 final float voltage is reached.
When the input supply (wall adapter or USB supply) is
removed, the LTC3552 enters a low current state dropping
the battery drain current to less than 2µA. Thermal regula-
tion maximizes charge rate without risk of overheating.
The synchronous step-down switching regulators gen-
erate adjustable output voltages from 5V down to 0.6V.
The switching frequency is set at 2.25MHz, allowing the
use of small surface mount inductors and capacitors.
, LT, LTC and LTM are registered trademarks 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.
Programmable Charge Current Up to 950mA
Complete Linear Charger and Dual DC/DC
Regulator
Buck Converter Output Voltage from 0.6V to 5V
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
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Low Quiescent Current Buck Converter (40µA)
Current Mode Operation, Constant Frequency (2.25MHz)
Low Profile (5mm
×
3mm
×
0.75mm) DFN Package
APPLICATIO S
Cellular Telephones, PDAs, MP3 Players
Bluetooth Applications
TYPICAL APPLICATIO
Single Cell Li-Ion Battery Charger with
C/5 Termination and Dual DC/DC Converter
LTC3552
1µF
619Ω
1.24k
RUN2
BAT
V
CC
POR
MODE/SYNC
SW1
R2
604k
R1
301k
3552 TA01
100
95
ITERM
PROG
CHRG
PWR
EN
SW2
800mA
10µF
EFFICIENCY (%)
V
IN
4.5V TO
6.5V
V
IN
RUN1
4.2V
1-CELL
Li-Ion
BATTERY
90
85
80
+
75
70
65
60
1
10
100
LOAD CURRENT (mA)
0.1
1000
3552 TA01b
V
OUT2
2.5V/
400mA
C
OUT2
4.7µF
CER
4.7µH
2.2µH
C
FF2
68pF
R4
887k
R3
280k
V
FB2
GND
V
FB1
C
FF1
33pF
V
OUT1
1.8V/
800mA
C
OUT1
10µF
CER
V
CC
= 3.3V, V
OUT
= 1.8V
Burst Mode OPERATION
REGULATOR 1, NO LOAD ON REGULATOR 2
U
U
U
Efficiency Curve/
Power Loss of Regulators
1000
EFFICIENCY
100
POWER LOSS (mW)
10
POWER LOSS
1
3552f
1

LTC3552EDHC#TRPBF Related Products

LTC3552EDHC#TRPBF LTC3552EDHC#PBF LTC3552EDHC
Description Linear Battery Charger Li-Ion/Li-Pol 950mA 4.2V 16-Pin DFN EP T/R Linear Battery Charger Li-Ion/Li-Pol 950mA 4.2V 16-Pin DFN EP Tube Linear Battery Charger Li-Ion/Li-Pol 950mA 0.6V to 5V 16-Pin DFN EP
EU restricts the use of certain hazardous substances Compliant Compliant Not Compliant
ECCN (US) EAR99 EAR99 EAR99
Part Status Active Active Unconfirmed
Type Linear Battery Charger Linear Battery Charger Linear Battery Charger
Battery Type Li-Ion|Li-Pol Li-Pol|Li-Ion Li-Pol|Li-Ion
Maximum Supply Current (mA) 1 1 1
Minimum Operating Supply Voltage (V) 4.25 4.25 4.25
Maximum Operating Supply Voltage (V) 8 8 8
Output Voltage (V) 4.2 4.2 4.2
Output Current (mA) 950(Max) 950(Max) 950(Max)
Minimum Operating Temperature (°C) -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85
Supplier Temperature Grade Extended Extended Extended
Pin Count 16 16 16
Standard Package Name DFN DFN DFN
Supplier Package DFN EP DFN EP DFN EP
Mounting Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max) 0.75(Max)
Package Length 5 5 5
Package Width 3 3 3
PCB changed 16 16 16
Lead Shape No Lead No Lead No Lead
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