|
|
PDF LTC4010 Data sheet ( Hoja de datos )
| Número de pieza | LTC4010 | |
| Descripción | High Efficiency Standalone Nickel Battery Charger | |
| Fabricantes | Linear Integrated Systems | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC4010 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
FEATURES
■ Complete NiMH/NiCd Charger for 1 to 16 Cells
■ No Microcontroller or Firmware Required
■ 550kHz PWM Current Source Controller
■ No Audible Noise with Ceramic Capacitors
■ Wide Input Voltage Range: 5.5V to 34V
■ Programmable Charge Current: 5% Accuracy
■ Automatic Trickle Precharge
■ –∆V Fast Charge Termination
■ Optional ∆T/∆t Fast Charge Termination
■ Optional Temperature Qualification
■ Automatic NiMH Top-Off Charge
■ Programmable Maximum Charging Durations
■ Automatic Recharge
■ Multiple Status Outputs
■ Micropower Shutdown
■ 16-Lead Thermally Enhanced TSSOP Package
U
APPLICATIO S
■ Integrated or Standalone Battery Charger
■ Portable Instruments or Consumer Products
■ Battery-Powered Diagnostics and Control
■ Back-Up Battery Management
Electrical Specifications Subject to Change
LTC4010
High Efficiency Standalone
Nickel Battery Charger
DESCRIPTIO
The LTC®4010 provides a complete, cost-effective nickel
battery fast charge solution in a small package using few
external components. A 550kHz PWM current source
controller and all necessary charge initiation, monitoring
and termination control circuitry are included.
The LTC4010 automatically senses the presence of a DC
adapter and battery insertion or removal. When an exter-
nal DC source is not present, the LTC4010 enters shut-
down and supply current drawn from an installed battery
drops to the lowest possible level. Heavily discharged
batteries are precharged with a trickle current. The LTC4010
can simultaneously use both –∆V and ∆T/∆t fast charge
termination techniques and can detect various battery
faults. If necessary, a top-off charge is automatically
applied to NiMH batteries after fast charging is completed.
The IC will also resume charging if the battery self-
discharges after a full charge cycle.
All LTC4010 charging operations are qualified by actual
charge time and maximum average cell voltage. Charging
may also be gated by minimum and maximum tempera-
ture limits. NiMH or NiCd fast charge termination param-
eters are pin selectable.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
2A NiMH Battery Charger
FROM
ADAPTER
5.5V TO 34V
3k
10µF
LTC4010
VCC
R FAULT TGATE
CHRG
READY
BGATE
TIMER PGND
49.9k
GND
CHEM
SENSE
BAT
VCDIV
VCELL
10k
10k 10µF
33nF
INTVDD VTEMP
0.1µF
68nF
TO
SYSTEM
LOAD
10µH
0.05Ω
2-CELL
NiMH PACK
WITH 10k NTC
4010 TA01a
DataSheet4 U .com
Typical NiMH Charge at 1.25C
2.2 50
2.0 45
1.8 40
1.6 TOP OFF 35
CHARGE
1.4 30
1.2 25
1.0
0
10 20 30 40
TIME (MINUTES)
20
50 60
4011 TA01b
4010p
1
1 page  
www.DataSheet4U.com
TYPICAL PERFOR A CE CHARACTERISTICS
Typical NiMH Charge Cycle
at 1C
1.65
1.60
36
34
1.55
1.50
1.45
1.40
1.35
1.30
0
SINGLE CELL
VOLTAGE
32
30
BATTERY
TEMPERATURE
28
26
1A
CHARGE CURRENT
24
22
20 40 60 80
TIME (MINUTES)
4010 G01
Charger Efficiency at DCIN = 20V,
IOUT = 2A
100
95
90
85
80
75
70
67
60
0 2 4 6 8 10 12 14 16 18 20
BATTERY VOLTAGE (V)
4010 G04
Fast Charge Current Line
Regulation
3
BAT = 4.8V
2
1
0 50°C
25°C
–1
0°C
–2
–3
6
10 14 18 22 26 30
VCC (V)
4010 G07
NiCd Charge at 2C
Charge Current Accuracy
0
FAST CHARGE
–2
–4
VCC = 12V
BAT = 4.8V
–6
–8 PRECHARGE
–10
–12
0
10 20 30 40
TEMPERATURE (°C)
50
4010 G05
Fast Charge Current Output
Regulation
3
VCC = 20V
2
1
0 50°C
25°C
–1
0°C
–2
–3
0
4
8 12 16
BAT (V)
4010 G08
DataSheet4 U .com
LTC4010
NiMH Charge at 0.6C
Charger Soft-Start
10
5
TGATE
5
0
BGATE
2
FAST CHARGE CURRENT
1
0 PRECHARGE CURRENT
200µs/DIV
4010 G06
PowerPath Switching
8
DCIN OPEN
4
VCC
0 INFET
DCIN
100µs/DIV
4010 G09
DC674A WITH 1kΩ SYSTEM LOAD AND 20kΩ
DCIN SHUNT, CHARGER PAUSED
4010p
5
5 Page 
www.DataSheet4U.com
U
OPERATIO
current threshold for CC such that the desired average
current through RSENSE is maintained. The current com-
parator output does this by switching the state of the SR
latch at the appropriate time.
At the beginning of each oscillator cycle, the PWM clock
sets the SR latch and the external P-channel MOSFET is
switched on (N-channel MOSFET switched off) to refresh
the current carried by the external inductor. The inductor
current and voltage drop across RSENSE begin to rise
linearly. During normal operation, the PFET is turned off
(NFET on) during the cycle by CC when the voltage
difference across RSENSE reaches the peak value set by
the output of EA. The inductor current then ramps down
linearly until the next rising PWM clock edge. This closes
the loop and maintains the desired average charge current
in the external inductor.
Low Dropout Charging
After charging is initiated, the LTC4010 does not require
that VCC remain at least 500mV above BAT because
situations exist where low dropout charging might occur.
LTC4010
In one instance, parasitic series resistance may limit PWM
headroom (between VCC and BAT) as 100% charge is
reached. A second case can arise when the DC adapter
selected by the end user is not capable of delivering the
current programmed by RSENSE, causing the output volt-
age of the adapter to collapse. While in low dropout, the
LTC4010 PWM runs near 100% duty cycle with a fre-
quency that may not be constant and can be less than
550kHz. The charge current will drop below the pro-
grammed value to avoid generating audible noise, so the
actual charge delivered to the battery may depend prima-
rily on the LTC4010 charge timer.
Internal Die Temperature
The LTC4010 provides internal overtemperature detec-
tion to protect against electrical overstress, primarily at
the FET driver outputs. If the die temperature rises above
this thermal limit, the LTC4010 stops switching and
indicates a fault as previously discussed.
APPLICATIO S I FOR ATIO
External DC Source
The external DC power source should be connected to the
charging system and the VCC pin through a power diode
acting as an input rectifier. This prevents catastrophic
system damage in the event of reverse-voltage polarity at
the DC input. The LTC4010 automatically senses when
this input drives the VCC pin above BAT. The open-circuit
voltage of the DC source should be between 5.5V and 34V,
depending on the number of cells being charged. In order
to avoid low dropout operation, ensure 100% capacity at
charge termination, and allow reliable detection of battery
insertion, removal or overvoltage, the following equation
can be used to determine the minimum full-load voltage
that should be produced at VCC when the external DC
power source is connected.
VCC(MIN) = (n • 2V) + 0.3V
where n is the number of series cells in the battery pack.
The LTC4010 will properly charge over a wide range of VCC
and BAT voltage combinations. Operating the LTC4010 in
low dropout or with VCC much greater than BAT will force
the PWM frequency to be much less than 550kHz. The
LTC4010 disables charging and sets a fault if a large VCC
to BAT differential would cause generation of audible noise.
Load Control
Proper current load control is an important consideration
when fast charging nickel cells. This control ensures that
the system load remains powered at all times, but that
normal system operation and associated load transients
do not adversely affect fast charge termination. The input
protecton detailed in the previous paragraph is an integral
part of the necessary load control.
The battery should also be connected to the raw system
supply by some rectifying means, thus forming a switch that
DataSheet4 U .com
4010p
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC4010.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC4010 | High Efficiency Standalone Nickel Battery Charger | Linear Integrated Systems |
| LTC4010 | High Efficiency Standalone Nickel Battery Charger |  Linear |
| LTC4011 | High Efficiency Standalone Nickel Battery Charger |  Linear Technology |
| LTC4012 | Multi-Chemistry Battery Charger |  Linear Technology Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |