FeaTures
n
n
LTC4000-1
High Voltage High Current
Controller for Battery Charging with
Maximum Power Point Control
DescripTion
The
LTC
®
4000-1
is a high voltage, high performance
controller that converts many externally compensated
DC/DC power supplies into full-featured battery chargers
with maximum power point control. In contrast to the
LTC4000, the LTC4000-1 has an input voltage regulation
loop instead of the input current regulation loop.
Features of the LTC4000-1’s battery charger include:
accurate (±0.25%) programmable float voltage, select-
able 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 LTC4000-1 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 shorted battery.
The LTC4000-1 is available in a low profile 28-lead
4mm
×
5mm QFN and SSOP packages.
n
n
n
n
n
n
n
n
Maximum Power Control: Solar Panel Input
Compatible
Complete High Performance Battery Charger When
Paired with a DC/DC Converter
Wide Input and Output Voltage Range: 3V to 60V
Input Ideal Diode for Low Loss Reverse Blocking
and Load Sharing
Output Ideal Diode for Low Loss PowerPath™ and
Load Sharing with the Battery
Programmable Charge Current: ±1% Accuracy
±0.25% Accurate Programmable Float Voltage
Programmable C/X or Timer Based Charge
Termination
NTC Input for Temperature Qualified Charging
28-Lead 4mm
×
5mm QFN or SSOP Packages
Solar Powered Battery Charger Systems
Battery Charger with High Impedance Input Source,
e.g., Fuel Cell or Wind Turbine
Battery Equipped Industrial or Portable Military
Equipments
applicaTions
n
n
n
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
10.8V at 10A Charger for Three LiFePO
4
Cells with a Solar Panel Input
SOLAR PANEL INPUT
<60V OPEN
CIRCUIT VOLTAGE
17.6V PEAK
POWER VOLTAGE
5m
IN
LT3845A
V
C
14.7k
ITH
CC
OUT
100µF
47nF
IID IGATE CSP
CSN
Si7135DP
BAT
CLN
IN
332k
1µF
IFB
20k
3V
BFB
NTC
IIMON
TMR
10nF
0.1µF
CL
24.9k
CX
22.1k
GND BIAS
1µF
10k
OFB
LTC4000-1
127k
FBG
133k
1.13M
V
BAT
10.8V FLOAT
10A MAX CHARGE
CURRENT
3-CELL LiFePO
4
BATTERY PACK
40001 TA01a
Si7135DP
V
OUT
12V, 15A
1.15M
5m
INPUT REGULATION VOLTAGE: V
INREG
(V)
Solar Panel Input Regulation,
Achieves Max Power Point
to Greater than 98%
20
T
A
= 25°C
18
BGATE
16
14
98% TO 95% PEAK POWER
100% TO 98% PEAK POWER
10
1
5
6
7
8
9
2
3
4
CHARGER OUTPUT CURRENT: I
RCS
(A)
10
12
10k
40001 TA01b
40001fa
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1
LTC4000-1
absoluTe MaxiMuM raTings
(Note 1)
IN, CLN, IID, CSP, CSN, BAT ....................... –0.3V to 62V
IN-CLN, CSP-CSN ............................................–1V to 1V
OFB, BFB, FBG ........................................... –0.3V to 62V
FBG ............................................................–1mA to 2mA
IGATE ...........Max (V
IID
, V
CSP
) – 10V to Max (V
IID
, V
CSP
)
BGATE .......Max (V
BAT
, V
CSN
) – 10V to Max (V
BAT
, V
CSN
)
ENC, CX, NTC, VM ...................................–0.3V to V
BIAS
IFB, CL, TMR, IIMON, CC .........................–0.3V to V
BIAS
BIAS .............................................–0.3V to Min (6V, V
IN
)
IBMON ..................................–0.3V to Min (V
BIAS
, V
CSP
)
ITH ............................................................... –0.3V to 6V
CHRG, FLT, RST
.......................................... –0.3V to 62V
CHRG, FLT, RST
..........................................–1mA to 2mA
Operating Junction Temperature Range
(Note 2)................................................................. 125°C
Lead Temperature (Soldering, 10 sec)
SSOP Package .................................................. 300°C
Storage Temperature Range .................. –65°C to 150°C
pin conFiguraTion
TOP VIEW
TOP VIEW
GND
CLN
ITH
IID
CC
IN
ENC
IBMON
CX
22 IGATE
21 OFB
20 CSP
29
GND
19 CSN
18 BGATE
17 BAT
16 BFB
15 FBG
9 10 11 12 13 14
TMR
BIAS
GND
CHRG
NTC
FLT
CL
TMR
GND
FLT
CHRG
BIAS
1
2
3
4
5
6
7
8
9
28 IFB
27 IIMON
26
RST
25 VM
24 GND
23 IN
22 CLN
21 CC
20 ITH
19 IID
18 IGATE
17 OFB
16 CSP
15 CSN
28 27 26 25 24 23
VM 1
RST
2
IIMON 3
IFB 4
ENC 5
IBMON 6
CX 7
CL 8
NTC 10
FBG 11
BFB 12
BAT 13
BGATE 14
UFD PACKAGE
28-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W,
θ
JC
= 4°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
GN PACKAGE
28-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 80°C/W,
θ
JC
= 25°C/W
orDer inForMaTion
LEAD FREE FINISH
LTC4000EUFD-1#PBF
LTC4000IUFD-1#PBF
LTC4000EGN-1#PBF
LTC4000IGN-1#PBF
TAPE AND REEL
LTC4000EUFD-1#TRPBF
LTC4000IUFD-1#TRPBF
LTC4000EGN-1#TRPBF
LTC4000IGN-1#TRPBF
PART MARKING*
40001
40001
LTC4000GN-1
LTC4000GN-1
PACKAGE DESCRIPTION
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead Plastic SSOP
28-Lead Plastic SSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
40001fa
2
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LTC4000-1
elecTrical characTerisTics
SYMBOL
V
IN
I
IN
I
BAT
Shutdown
ENC Input Voltage Low
ENC Input Voltage High
ENC Pull-Up Current
ENC Open Circuit Voltage
Voltage Regulation
V
IFB_REG
V
BFB_REG
Input Feedback Voltage
IFB Input Current
Battery Feedback Voltage
l
l
l
l
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
CLN
= 3V to 60V unless otherwise noted (Notes 2, 3).
PARAMETER
Input Supply Operating Range
Input Quiescent Operating Current
Battery Pin Operating Current
Battery Only Quiescent Current
V
IN
≥ 3V, V
CSN
= V
CSP
≥ V
BAT
V
IN
= 0V, V
CSN
= V
CSP
≤ V
BAT
l
l
CONDITIONS
l
MIN
3
TYP
0.4
50
10
MAX
60
100
20
0.4
UNITS
V
mA
µA
μA
V
V
µA
V
1.5
–4
–2
2.5
1.000
± 0.1
1.133
1.120
1.176
1.136
1.136
± 0.1
1.193
± 0.1
100
96.9
82
65
97.6
0.5
86
68
3
1.139
1.147
1.204
400
98.3
90
71
1.010
–0.5
1.5
0.985
V
ENC
= 0V
V
ENC
= Open
l
V
µA
V
V
µA
V
µA
Ω
%
%
%
%
%
V
IFB
= 1.0V
BFB Input Current
V
OFB_REG
R
FBG
V
RECHRG(RISE)
V
RECHRG(HYS)
V
OUT(INST_ON)
V
LOBAT
V
LOBAT(HYS)
Output Feedback Voltage
OFB Input Current
Ground Return Feedback Resistance
Rising Recharge Battery Threshold Voltage
Instant-On Battery Voltage Threshold
Falling Low Battery Threshold Voltage
Low Battery Threshold Voltage Hysteresis
Ratio of Monitored-Current Voltage to Sense
Voltage
V
OS
Sense Voltage Offset
CLN, CSP, CSN Common Mode Range
CLN Pin Current
CSP Pin Current
CSN Pin Current
I
CL
I
CL_TRKL
Pull-Up Current for the Charge Current Limit
Programming Pin
Pull-Up Current for the Charge Current Limit
Programming Pin in Trickle Charge Mode
Input Current Monitor Resistance to GND
Charge Current Monitor Resistance to GND
A5 Error Amp Offset for the Charge Current
Loop (See Figure 1)
Maximum Programmable Current Limit
Voltage Range
V
BFB
= 1.2V
l
V
OFB
= 1.2V
l
% of V
BFB_REG
% of V
BFB_REG
% of V
BFB_REG
% of V
BFB_REG
V
IN,CLN
≤ 50mV, V
IIMON
/V
IN,CLN
V
CSP,CSN
≤ 50mV, V
IBMON
/V
CSP,CSN
V
CSP,CSN
≤ 50mV, V
CSP
= 60V or
V
IN,CLN
≤ 50mV, V
IN
= 60V (Note 4)
(Note 4)
V
IGATE
= Open, V
IID
= 0V
V
BGATE
= Open, V
BAT
= 0V
l
Recharge Battery Threshold Voltage Hysteresis % of V
BFB_REG
l
l
Current Monitoring and Regulation
l
18.5
20
21
V/V
–300
l
300
60
±1
90
45
µV
V
µA
μA
μA
3
l
–55
–5.5
40
40
–50
–5.0
90
90
0
1.0
–45
–4.5
140
140
10
1.015
μA
μA
kΩ
kΩ
mV
V
V
BFB
< V
LOBAT
l
V
CL
= 0.8V
l
l
–10
0.985
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3
LTC4000-1
elecTrical characTerisTics
SYMBOL
PARAMETER
CX Pin Pull-Up Current
V
CX,IBMON(OS)
V
CX,IBMON(HYS)
CX Comparator Offset Voltage, IBMON Falling
CX Comparator Hysteresis Voltage
TMR Pull-Up Current
TMR Pull-Down Current
TMR Pin Frequency
TMR Threshold for CX Termination
t
T
t
T
/t
BB
V
NTC(COLD)
V
NTC(HOT)
V
NTC(HYS)
V
NTC(OPEN)
R
NTC(OPEN)
V
VM(TH)
V
VM(HYS)
Charge Termination Time
C
TMR
= 0.1μF
Ratio of Charge Terminate Time to Bad Battery C
TMR
= 0.1μF
Indicator Time
NTC Cold Threshold
NTC Hot Threshold
NTC Thresholds Hysteresis
NTC Open Circuit Voltage
NTC Open Circuit Input Resistance
VM Input Falling Threshold
VM Input Hysteresis
VM Input Current
I
RST,CHRG,FLT(LKG)
Open Drain Status Pins Leakage Current
V
RST,CHRG,FLT(VOL)
Open Drain Status Pins Voltage Output Low
Input PowerPath Control
Input PowerPath Forward Regulation Voltage
Input PowerPath Fast Reverse Turn-Off
Threshold Voltage
Input PowerPath Fast Forward Turn-On
Threshold Voltage
Input Gate Turn-Off Current
Input Gate Turn-On Current
I
IGATE(FASTOFF)
I
IGATE(FASTON)
V
IGATE(ON)
Input Gate Fast Turn-Off Current
Input Gate Fast Turn-On Current
Input Gate Clamp Voltage
V
IID,CSP
, 3V ≤ V
CSP
≤ 60V
V
IID,CSP
, 3V ≤ V
CSP
≤ 60V,
V
IGATE
= V
CSP
– 2.5V,
∆I
IGATE
/∆ V
IID,CSP
≥ 100μA/mV
V
IID,CSP
, 3V ≤ V
CSP
≤ 60V,
V
IGATE
= V
IID
– 1.5V,
∆I
IGATE
/∆ V
IID,CSP
≥ 100μA/mV
V
IID
= V
CSP
, V
IGATE
= V
CSP
– 1.5V
V
CSP
= V
IID
– 20mV,
V
IGATE
= V
IID
– 1.5V
V
CSP
= V
IID
+ 0.1V,
V
IGATE
= V
CSP
– 5V
V
CSP
= V
IID
– 0.2V,
V
IGATE
= V
IID
– 1.5V
I
IGATE
= 2µA, V
IID
= 12V to 60V,
V
CSP
= V
IID
– 0.5V, Measure
V
IID
– V
IGATE
I
IGATE
= – 2μA, V
IID
= 3V to 59.5V,
V
CSP
= V
IID
+ 0.5V, Measure
V
CSP
– V
IGATE
l
l
l
l
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
CLN
= 3V to 60V unless otherwise noted (Notes 2, 3).
CONDITIONS
V
CX
= 0.1V
V
CX
= 0.1V
V
TMR
= 0V
V
TMR
= 2V
C
TMR
= 0.01μF
l
l
l
l
l
l
l
MIN
–5.5
0.5
TYP
–5.0
10
5
–5.0
5.0
MAX
–4.5
25
UNITS
µA
mV
mV
μA
μA
Charge Termination
400
2.3
3.95
73
33
45
500
2.1
2.9
4
75
35
5
50
300
600
2.5
3.5
4.05
77
37
55
Hz
V
h
h/h
%
%
%
%
kΩ
V
NTC
Rising, % of V
BIAS
V
NTC
Falling, % of V
BIAS
% of V
BIAS
% of V
BIAS
l
Voltage Monitoring and Open Drain Status Pins
1.176
1.193
40
V
VM
= 1.2V
V
PIN
= 60V
I
PIN
= 1mA
l
1.204
V
mV
µA
µA
±0.1
±1
0.4
0.1
–90
8
–50
20
–20
V
mV
mV
l
40
80
130
mV
–0.3
0.3
–0.5
0.7
13
15
μA
μA
mA
mA
V
Input Gate Off Voltage
l
0.45
0.7
V
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LTC4000-1
elecTrical characTerisTics
SYMBOL
PARAMETER
Battery Discharge PowerPath Forward
Regulation Voltage
Battery PowerPath Fast Reverse Turn-Off
Threshold Voltage
Battery PowerPath Fast Forward Turn-On
Threshold Voltage
Battery Gate Turn-Off Current
Battery PowerPath Control
V
BAT,CSN
, 2.8V ≤ V
BAT
≤ 60V
V
BAT,CSN
, 2.8V ≤ V
BAT
≤ 60V, Not
Charging, V
BGATE
= V
CSN
– 2.5V,
∆I
BGATE
/∆V
BAT,CSN
≥ 100μA/mV
V
BAT,CSN
, 2.8V ≤ V
CSN
≤ 60V,
V
BGATE
= V
BAT
– 1.5V,
∆I
BGATE
/∆ V
BAT,CSN
≥ 100μA/mV
V
BGATE
= V
CSN
– 1.5V, V
CSN
≥ V
BAT
,
V
OFB
< V
OUT(INST_ON)
and Charging
in Progress, or V
CSN
= V
BAT
and Not
Charging
V
BGATE
= V
BAT
– 1.5V, V
CSN
≥ V
BAT
,
V
OFB
> V
OUT(INST_ON)
and Charging in
Progress, or V
CSN
= V
BAT
– 20mV
V
CSN
= V
BAT
+ 0.1V and Not
Charging, V
BGATE
= V
CSN
– 5V
V
CSN
= V
BAT
– 0.2V,
V
BGATE
= V
BAT
– 1.5V
I
BGATE
= 2μA, V
BAT
= 12V to 60V,
V
CSN
= V
BAT
– 0.5V, Measure
V
BAT
– V
BGATE
l
l
l
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
CLN
= 3V to 60V unless otherwise noted (Notes 2, 3).
CONDITIONS
MIN
0.1
–90
TYP
8
–50
MAX
20
–20
UNITS
mV
mV
l
40
80
130
mV
–0.3
μA
Battery Gate Turn-On Current
0.3
μA
I
BGATE(FASTOFF)
I
BGATE(FASTON)
V
BGATE(ON)
Battery Gate Fast Turn-Off Current
Battery Gate Fast Turn-On Current
Battery Gate Clamp Voltage
–0.5
0.7
13
15
mA
mA
V
Battery Gate Off Voltage
I
BGATE
= – 2μA, V
BAT
= 2.8V to 59.5V,
l
V
CSN
= V
BAT
+ 0.5V and not Charging,
Measure V
CSN
– V
BGATE
No Load
I
BIAS
= – 0.5mA
V
BIAS
= 0V
CC = 1V
CC = Open
V
ITH
= 0V, CC = 0V
V
ITH
= 0.4V, CC = Open
ITH = Open
l
l
0.45
0.7
V
BIAS Regulator Output and Control Pins
V
BIAS
∆V
BIAS
BIAS Output Voltage
BIAS Output Voltage Load Regulation
BIAS Output Short-Circuit Current
Transconductance of Error Amp
Open Loop DC Voltage Gain of Error Amp
I
ITH(PULL_UP)
I
ITH(PULL_DOWN)
Pull-Up Current on the ITH Pin
Pull-Down Current on the ITH Pin
Open Loop DC Voltage Gain of ITH Driver
2.4
2.9
–0.5
–20
0.5
80
–6
0.5
–5
1
60
–4
3.5
–10
V
%
mA
mA/V
dB
μA
mA
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 LTC4000-1 is tested under conditions such that T
J
≈ T
A
.
The LTC4000E-1 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-1 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 (T
J
, in °C) is
calculated from the ambient temperature (T
A
, in °C) and power dissipation
(P
D
, in Watts) according to the following formula:
T
J
= T
A
+ (P
D
•
θ
JA
), where
θ
JA
(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.
40001fa
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5
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