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PDF LTC4009-2 Data sheet ( Hoja de datos )
| Número de pieza | LTC4009-2 | |
| Descripción | Multi-Chemistry Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n General Purpose Battery Charger Controller
n Efficient 550kHz Synchronous Buck PWM Topology
n ±0.5% Output Float Voltage Accuracy
n Programmable Charge Current: 4% Accuracy
n Programmable AC Adapter Current Limit:
3% Accuracy
wwwn.DaNtoaSAhueedti4bUl.ecoNmoise with Ceramic Capacitors
n Wide Input Voltage Range: 6V to 28V
n Wide Output Voltage Range: 2V to 28V
n Indicator Outputs for AC Adapter Present, Charging,
C/10 Current Detection and Input Current Limiting
n Analog Charge Current Monitor
n Micropower Shutdown
n Thermally Enhanced 20-Pin 4mm × 4mm × 0.75mm
QFN Package
APPLICATIONS
n Notebook Computers
n Portable Instruments
n Battery Backup Systems
L, 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 5723970.
LTC4009
LTC4009-1/LTC4009-2
High Efficiency,
Multi-Chemistry
Battery Charger
DESCRIPTION
The LTC4009 is a constant-current/constant-voltage battery
charger controller. It uses a synchronous quasi-constant
frequency PWM control architecture that will not generate
audible noise with ceramic bulk capacitors. Charge cur-
rent is set by the combination of external sense, input and
programming resistors. With no built-in termination, the
LTC4009 family charges a wide range of batteries under
external control.
The LTC4009 features a fully adjustable output voltage, while
the LTC4009-1 and LTC4009-2 can be pin-programmed for
lithium-ion/polymer battery packs of 1-, 2-, 3- or 4-series
cells. The LTC4009-1 provides output voltage of 4.1V/cell,
and the LTC4009-2 is a 4.2V/cell version.
The device includes AC adapter input current limiting which
maximizes the charge rate for a fixed input power level. An
external sense resistor programs the input current limit, and
the ICL status pin indicates when the battery charge current
is being reduced as a result of AC adapter current limiting.
The CHRG status pin is active during all charging modes,
including special indication for low charge current.
TYPICAL APPLICATION
FROM
ADAPTER
13V TO 20V
0.1μF
CHARGE
CURRENT
MONITOR
14.3k
1.5k
TO/FROM
MCU
DCIN
CLP
CLN
DCDIV BOOST
LTC4009
TGATE
CHRG
ACP
SW
INTVDD
ICL BGATE
SHDN GND
ITH
6.04k
CSP
0.1μF
PROG
4.7nF 26.7k
CSN
BAT
FBDIV
VFB
33mΩ
0.1μF
5.1k
0.1μF
2μF
3.01k
3.01k
301k
32.8k
20μF
20μF
POWER TO
SYSTEM
6.8μH
33mΩ
+ 12.3V
Li-Ion
BATTERY
4009 TA01a
Efficiency at DCIN = 20V
100 10000
95
90
85
80
75
70
0
EFFICIENCY
POWER LOSS
1000
VFLOAT = 12.3V
RSENSE = 33mΩ
RIN = 3.01k
RPROG = 26.7k
DIN = SSB44
L = IHLP-2525CZ 6.8μH
100
0.5 1.0 1.5 2.0 2.5 3.0
CHARGE CURRENT (A)
4009 TA01b
4009fb
1
1 page  
TEST CIRCUITS
LTC4009
FROM ICL
(CLP = CLN)
1.2085V
–
–
– EA
+
PROG VFB
13 10
1.2085V
TARGET
www.DataSheet4U.com
+
LTC1055
–
ITH
12
0.6V
4009 TC01
LTC4009
LTC4009-1/LTC4009-2
LTC4009-1
LTC4009-2
FROM ICL
(CLP = CLN)
1.2085V
–
–
–
EA
+
PROG BAT
13 11
TARGET VARIES
WITH FVS0,1
+
LTC1055
–
ITH
12
0.6V
4009 TC02
TYPICAL PERFORMANCE CHARACTERISTICS
(TA = 25°C unless otherwise noted. DIN = SSB44, L = IHLP-2525 6.8μH)
Efficiency at DCIN = 20V, BAT = 8V
100
RSENSE = 33mΩ
RIN = 3.01k
10000
95
POWER LOSS
90 1000
EFFICIENCY
85
Efficiency at DCIN = 20V, BAT = 12V
100
RSENSE = 33mΩ
RIN = 3.01k
10000
95
POWER LOSS
EFFICIENCY
90 1000
85
80
0
0.5 1.0 1.5 2.0 2.5
CHARGE CURRENT (A)
100
3.0
4009 G01
80
0
0.5 1.0 1.5 2.0 2.5
CHARGE CURRENT (A)
100
3.0
4009 G02
Efficiency at DCIN = 20V, BAT = 16V
100
RSENSE = 33mΩ
RIN = 3.01k
10000
95 EFFICIENCY
POWER LOSS
90 1000
85
80
0
0.5 1.0 1.5 2.0 2.5
CHARGE CURRENT (A)
100
3.0
4009 G03
VFB Line Regulation
0.10
LTC4009 TEST CIRCUIT
0.08
0.06
0.04
0.02
0
–0.02
–0.04
–0.06
–0.08
–0.10
5
10 15 20
CLP (V)
25 30
4009 G04
FBDIV RON vs BAT
300
275
CLP = BAT + 3V
(CLP ≥ 6V)
250
225
200
175
150
125
100
75
0
5 10 15 20 25
BAT (V)
4009 G05
4009fb
5
5 Page 
LTC4009
LTC4009-1/LTC4009-2
OPERATION
Overview
The LTC4009 is a synchronous step-down (buck) current
mode PWM battery charger controller. The maximum
charge current is programmed by the combination of a
charge current sense resistor (RSENSE), matched input
resistors (RIN, Figure 1), and a programming resistor
(RPROG) between the PROG and GND pins. Battery volt-
age is programmed either with an external resistor divider
between FBDIV and GND (LTC4009) or two digital battery
voltage select pins (LTC4009-1/LTC4009-2). In addition,
wwwth.DeaPtaRShOeGetp4Uin.cpormovides a linearized voltage output of the
actual charge current.
The LTC4009 family does not have any built-in charge
termination and is flexible enough for charging any type
of battery chemistry. These are building block ICs intended
for use with an external circuit, such as a microcontroller,
capable of managing the entire algorithm required for
the specific battery being charged. Each member of the
LTC4009 family features a shutdown input and various state
indicator outputs, allowing easy and direct management by
a wide range of external (digital) charge controllers. Due
to the popularity of rechargeable lithium-ion chemistries,
the LTC4009-1 and LTC4009-2 also offer internal precision
resistors that can be digitally selected to produce one of
four preset output voltages for simplified design of those
charger types.
Shutdown
The LTC4009 remains in shutdown until DCDIV exceeds
1.2V, and SHDN is driven above 1.4V. In shutdown, current
drain from the battery is reduced to the lowest possible
level, thereby increasing standby time. When in shutdown,
the ITH pin is pulled to GND and the CHRG, ICL, FET gate
drivers and INTVDD output are all disabled. The ACP status
output indicates sensed adapter input voltage during all
LTC4009 states. Charging can be stopped at any time by
forcing SHDN below 300mV.
Soft-Start
Exiting the shutdown state enables the charger and releases
the ITH pin. When enabled, switching will not begin until
CLP exceeds BAT by 100mV and ITH exceeds a threshold
that assures initial current will be positive (about 5% to
25% of the maximum programmed current). To limit inrush
current, soft-start delay is created with the compensation
values used on the ITH pin. Longer soft-start times can be
realized by increasing the filter capacitor on ITH, if reduced
loop bandwidth is acceptable. The actual charge current at
the end of soft-start will depend on which loop (current,
voltage or adapter limit) is in control of the PWM. If this
current is below that required by the ITH start-up threshold,
the resulting charge current transient duration depends on
loop compensation but is typically less than 100μs.
Bulk Charge
When soft-start is complete, the LTC4009 begins sourc-
ing the current programmed by the external components
connected to CSP, CSN and PROG. Some batteries may
require a small conditioning trickle current if they are heavily
discharged. As shown in the Applications Information sec-
tion, the LTC4009 can address this need through a variety
of low current circuit techniques on the PROG pin. Once
a suitable cell voltage has been reached, charge current
can be switched to a higher, bulk charge value.
End-of-Charge and CHRG Output
As the battery approaches the programmed output volt-
age, charge current will begin to decrease. The open-
drain CHRG output can indicate when the current drops
to 10% of its programmed full-scale value by turning off
the strong pull-down (open-drain FET) and turning on a
weak 25μA pull-down current. This weak pull-down state
is latched until the part enters shutdown or the sensed
current rises to roughly C/6. C/10 indication will not be
set if charge current has been reduced due to adapter
input current limiting or DCIN/battery overvoltage. As
the charge current approaches 0A, the PWM continues to
operate in full continuous mode. This avoids generation
of audible noise, allowing bulk ceramic capacitors to be
used in the application.
4009fb
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC4009-2.PDF ] | |
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