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PDF LTC4059A Data sheet ( Hoja de datos )
| Número de pieza | LTC4059A | |
| Descripción | 900mA Linear Li-Ion Battery Chargers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4059w/wwL.TDaCtaSh4ee0t4U5.c9omA
900mA Linear Li-Ion
Battery Chargers with
Thermal Regulation in 2 × 2 DFN
FEATURES
DESCRIPTIO
s Programmable Charge Current Up to 900mA
s Charge Current Monitor Output for Charge
Termination*
s Constant-Current/Constant-Voltage Operation with
Thermal Regulation to Maximize Charging Rate
Without Risk of Overheating*
s Constant-Current Source Mode for Charging
Nickel Batteries (LTC4059 Only)
s ACPR Pin Indicates Presence of Input Supply
(LTC4059A Only)
s No External MOSFET, Sense Resistor or Blocking
Diode Required
s Operating Supply Voltage from 3.75V to 8V
s Charges Single Cell Li-Ion Batteries Directly from
USB Port
s Preset 4.2V Charge Voltage with 0.6% Accuracy
s 10µA Supply Current in Shutdown Mode
s Tiny 6-Lead (2mm × 2mm) DFN Package
U
APPLICATIO S
s Wireless PDAs
s Cellular Phones
s Portable Electronics
s Wireless Headsets
s Digital Cameras
The LTC®4059/LTC4059A are constant-current/constant-
voltage linear chargers for single cell lithium-ion batteries.
Their 2mm × 2mm DFN package and low external compo-
nent count make these chargers especially well suited for
portable applications. Furthermore, they are designed to
work within USB power specifications.
No external sense resistor, MOSFET or blocking diode is
required. Thermal feedback regulates the charge current
to limit the die temperature during high power operation or
high ambient thermal conditions. The charge voltage is
fixed at 4.2V and the charge current is programmable.
When the input supply (wall adapter or USB supply) is
removed, the LTC4059/LTC4059A automatically enter a low
current state, dropping the battery current drain to less than
1µA. With power applied, they can be put into shutdown
mode, reducing the supply current to 10µA.
The LTC4059A features an open-drain status pin to indi-
cate the presence of an input voltage. The LTC4059 can be
used as a constant-current source to charge Nickel cells.
Other features include undervoltage lockout protection
and a current monitor pin which can indicate when to
terminate a charge cycle.
The LTC4059/LTC4059A are available in a 6-lead, low
profile (0.8mm) 2mm × 2mm DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*US Patent 6,522,118
TYPICAL APPLICATIO
VIN
4.5V TO 8V
1µF
VDD
50k
VCC ACPR
LTC4059A 600mA
EN BAT
GND PROG
+
2k
4059 TA01
µP
4.2V
Li-Ion
BATTERY
Complete Charge Cycle (800mAh Battery)
700
CONSTANT
CURRENT
600
CONSTANT
VOLTAGE
4.4
4.2
500 4.0
400 3.8
300 3.6
200
100
VCC = 5V
RPROG = 2k
TA = 25°C
0
0 0.5
1 1.5
TIME (HOURS)
3.4
3.2
3.0
2 2.5
4059 TA02
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LTC4059w/wwL.TDaCtaSh4ee0t4U5.c9omA
PI FU CTIO S
GND (Pins 1, 7): Ground/Exposed Pad. The exposed
package pad is ground and must be soldered to the PC
board for maximum heat transfer.
Li CC (Pin 2, LTC4059): Li-Ion/Constant Current Input
Pin. Pulling this pin above VLi CC disables voltage mode
thereby providing a constant current to the BAT pin. This
feature is useful for charging Nickel chemistry batteries.
Tie to GND if unused.
ACPR (Pin 2, LTC4059A): Open-Drain Power Supply
Status Output. When VCC is greater than the undervoltage
lockout threshold, the ACPR pin will pull to ground;
otherwise the pin is forced to a high impedance state.
BAT (Pin 3): Charge Current Output. Provides charge
current to the battery and regulates the final float voltage
to 4.2V. An internal precision resistor divider from this pin
sets this float voltage and is disconnected in shutdown
mode.
VCC (Pin 4): Positive Input Supply Voltage. This pin
provides power to the charger. VCC can range from 3.75V
to 8V. This pin should be bypassed with at least a 1µF
capacitor. When VCC is within 35mV of the BAT pin
voltage, the LTC4059 enters shutdown mode, dropping
IBAT to less than 4µA.
PROG (Pin 5): Charge Current Program and Charge Cur-
rent Monitor Pin. Connecting a resistor, RPROG, to ground
programs the charge current. When charging in constant-
current mode, this pin servos to 1.21V. In all modes, the
voltage on this pin can be used to measure the charge
current using the following formula:
IBAT
=
VPROG
RPROG
•
1000
EN (Pin 6): Enable Input Pin. Pulling this pin above the
manual shutdown threshold (VMS is typically 0.92V) puts
the LTC4059 in shutdown mode, thus terminating a charge
cycle. In shutdown mode, the LTC4059 has less than 25µA
supply current and less than 1µA battery drain current.
Enable is the default state, but the pin should be tied to
GND if unused.
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LTC4059w/wwL.TDaCtaSh4ee0t4U5.c9omA
PACKAGE DESCRIPTIO
DC Package
6-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1703)
0.675 ±0.05
R = 0.115
TYP
0.56 ± 0.05
(2 SIDES)
4
0.38 ± 0.05
6
2.50 ±0.05
1.15
±
0.05
0.61 ±0.05
(2 SIDES)
PACKAGE
PIN 1
OUTLINE TOP MARK
(SEE NOTE 5)
0.25 ± 0.05
0.50 BSC
1.42 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.200 REF
2.00 ±0.10
(4 SIDES)
0.75 ±0.05
0.00 – 0.05
PIN 1
NOTCH
(DC6) DFN 0403
31
0.25 ± 0.05
0.50 BSC
1.37 ±0.05
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2)
2. ALL DIMENSIONS ARE IN MILLIMETERS
3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
4. EXPOSED PAD SHALL BE SOLDER PLATED
5. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC4059A.PDF ] | |
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