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PDF LTC4000 Data sheet ( Hoja de datos )
| Número de pieza | LTC4000 | |
| Descripción | High Voltage High Current Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4000
Features
High Voltage High Current
Controller for Battery Charging
and Power Management
Description
n Complete High Performance Battery Charger When
Paired with a DC/DC Converter
n Wide Input and Output Voltage Range: 3V to 60V
n Input Ideal Diode for Low Loss Reverse Blocking
and Load Sharing
n Output Ideal Diode for Low Loss PowerPath™ and
Load Sharing with the Battery
n Instant-On Operation with Heavily Discharged
Battery
n Programmable Input and Charge Current:
±1% Accuracy
n ±0.25% Accurate Programmable Float Voltage
n Programmable C/X or Timer Based Charge
Termination
n NTC Input for Temperature Qualified Charging
n 28-Lead 4mm × 5mm QFN or SSOP Packages
Applications
n High Power Battery Charger Systems
n High Performance Portable Instruments
n Industrial Battery Equipped Devices
n Notebook/Subnotebook Computers
The LTC®4000 is a high voltage, high performance controller
that converts many externally compensated DC/DC power
supplies into full-featured battery chargers.
Features of the LTC4000’s battery charger include: accurate
(±0.25%) programmable float voltage, selectable timer or
current termination, temperature qualified charging using
an NTC thermistor, automatic recharge, C/10 trickle charge
for deeply discharged cells, bad battery detection and
status indicator outputs. The battery charger also includes
precision current sensing that allows lower sense voltages
for high current applications.
The LTC4000 supports intelligent PowerPath control. An
external PFET provides low loss reverse current protec-
tion. Another external PFET provides low loss charging
or discharging of the battery. This second PFET also
facilitates an instant-on feature that provides immediate
downstream system power even when connected to a
heavily discharged or short faulted battery.
The LTC4000 is available in a low profile 28-lead 4mm ×
5mm QFN and SSOP packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
48V to 10.8V at 10A Buck Converter Charger for Three LiFePO4 Cells
15V TO 60V
5mΩ
IN SHDN
LT3845A
VC
OUT
100µF
Si7135DP
14.7k
1.10M
ITH
RST
CLN
IN
1µF
100k
VM
3.0V ENC
CHRG
FLT
10nF
IIMON
IBMON
10nF TMR
47nF
CC
IID IGATE CSP
CSN
BGATE
BAT
OFB
LTC4000
FBG
BFB
NTC
CL CX GND BIAS
0.1µF
24.9k 22.1k
1µF
1.15M
VOUT
12V, 15A
5mΩ
Si7135DP
127k
133k
1.13M
VBAT
10.8V FLOAT
10A MAX CHARGE
CURRENT
10k
10k
3-CELL LiFePO4
BATTERY PACK
NTHS0603
N02N1002J
4000 TA01a
For more information www.linear.com/LTC4000
Charge Current
vs VBAT During
aanCdhVaOrgUeT
Profile
Cycle
12 11
10
ICHARGE
VOUT
10.5
8 VOUT
6
10
9.5
49
2 ICHARGE
0
6 7 8 9 10
VBAT (V)
8.5
8
11 12
4000 TA01b
4000fb
1
1 page  
LTC4000
E lectrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = VCLN = 3V to 60V unless otherwise noted (Notes 2, 3).
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Battery PowerPath Control
Battery Discharge PowerPath Forward
Regulation Voltage
VBAT,CSN, 2.8V ≤ VBAT ≤ 60V
l 0.1 8 20 mV
Battery PowerPath Fast Reverse Turn-Off
VBAT,CSN, 2.8V ≤ VBAT ≤ 60V, Not
l –90
–50
–20
Threshold Voltage
C∆hIBaGrAgTinE/g∆,VVBBAGTA,CTSEN=≥V1C0SN0μ–A2/m.5VV,
Battery PowerPath Fast Forward Turn-On
Threshold Voltage
VVBBAGTA,TCESN=,V2B.8ATV–≤1V.5CSVN, ≤ 60V,
∆IBGATE/∆ VBAT,CSN ≥ 100μA/mV
l 40
80 130
Battery Gate Turn-Off Current
VBGATE = VCSN – 1.5V, VCSN ≥ VBAT,
VOFB < VOUT(INST_ON) and Charging
in Progress, or VCSN = VBAT and Not
Charging
–0.3
mV
mV
μA
Battery Gate Turn-On Current
IBGATE(FASTOFF)
IBGATE(FASTON)
VBGATE(ON)
Battery Gate Fast Turn-Off Current
Battery Gate Fast Turn-On Current
Battery Gate Clamp Voltage
Battery Gate Off Voltage
BIAS Regulator Output and Control Pins
PVVrBOoGFgBArT>eEsV=sO,VUoBTrA(IVTNCS–ST1N_O.=5NV)V,aBVnAdCTS–CNh2≥a0rVmgBiVnAgT,in
VCSN = VBAT + 0.1V and Not
Charging, VBGATE = VCSN – 3V
VCSN = VBAT – 0.2V,
VBGATE = VBAT – 1.5V
IBGATE = 2μA, VBAT = 12V to 60V,
VCSN = VBAT – 0.5V, Measure
VBAT – VBGATE
IBGATE = – 2μA, VBAT = 2.8V to 60V,
VCSN = VBAT + 0.5V and not Charging,
Measure VCSN – VBGATE
l
l
0.3
–0.5
0.7
13 15
0.45 0.7
μA
mA
mA
V
V
VBIAS
ΔVBIAS
BIAS Output Voltage
BIAS Output Voltage Load Regulation
BIAS Output Short-Circuit Current
Transconductance of Error Amp
No Load
IBIAS = – 0.5mA
VBIAS = 0V
CC = 1V
l 2.4 2.9 3.5
V
–0.5 –10
%
–12 mA
0.5 mA/V
Open Loop DC Voltage Gain of Error Amp
CC = Open
80 dB
IITH(PULL_UP)
IITH(PULL_DOWN)
Pull-Up Current on the ITH Pin
Pull-Down Current on the ITH Pin
Open Loop DC Voltage Gain of ITH Driver
VITH = 0V, CC = 0V
VITH = 0.4V, CC = Open
ITH = Open
–6 –5 –4
μA
l 0.5
1
mA
60 dB
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 LTC4000 is tested under conditions such that TJ ≈ TA. The
LTC4000E is guaranteed to meet specifications from 0°C to 85°C junction
temperature. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC4000I is guaranteed over the
full –40°C to 125°C operating junction temperature range. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. The junction temperature (TJ, in °C) is calculated from the ambient
temperature (TA, in °C) and power dissipation (PD, in Watts) according to
the following formula:
TJ = TA + (PD • θJA), where θJA (in °C/W) is the package thermal
impedance.
Note 3: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 4: These parameters are guaranteed by design and are not 100%
tested.
For more information www.linear.com/LTC4000
4000fb
5
5 Page 
Block Diagram
RIS
IN
CIN
CCLN
RVM1 VM
RVM2
IN CLN
– CP1
1.193V +
A8
gm = 0.33m
IIMON
CIIMON
BIAS
RIL IL
50µA
60k
CBIAS
IN
LDO,
BG,
REF REF
BIAS
DC/DC CONVERTER
RC
RST ITH
CIID
CC
CC
10M
IID IGATE
8mV +–
A1
60k
INPUT IDEAL
DIODE DRIVER
A4
+
1V ––gm
A10
gm–
ITH AND CC DRIVER
A5
– 1V
gm+–
A7+ OFB
gm– 1.193V
A6+ BFB
gm– 1.136V
NTC + CP4
TOO COLD
–
+ CP3
NTC FAULT
– TOO HOT
BIAS
2µA
LOGIC
CP2 –
+
GND
ENC CHRG
FLT
LTC4000
OUT
CIBMON
IBMON
CSP
SYSTEM
CL LOAD
A9
gm = 0.33m
CSN
A2
+– 8mV
gm A11
LINEAR
GATE
DRIVER
AND
VOLTAGE
CLAMP
BGATE
0.974V
ENABLE
CHARGING
BATTERY IDEAL DIODE
AND INSTANT-ON DRIVER
BIAS
5µA/
50µA
CL
OFB
ROFB1
RCL
RCS
CP6 – 0.771V
+
BFB
CP5
1.109V
FBG
ROFB2
RBFB1
RBFB2
10mV
–+
OSCILLATOR
BAT
BIAS
5µA
CBAT +
–
RNTC
CX
TMR CTMR RCX
BATTERY PACK
4000 BD
R3
Figure 1. LTC4000 Functional Block Diagram
For more information www.linear.com/LTC4000
4000fb
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4000.PDF ] | |
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