LTM8061IV-8.2PBF [Linear]
32V, 2A μModule Li-Ion/ Polymer Battery Charger; 32V ， 2A的μModule锂离子/聚合物电池充电器
| 型号： | LTM8061IV-8.2PBF |
| 厂家： | 
Linear |
| 描述： | 32V, 2A μModule Li-Ion/ Polymer Battery Charger |
| 文件： | 总20页 (文件大小：202K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTM8061
32V, 2A µModule Li-Ion/
Polymer Battery Charger
FEATURES
DESCRIPTION
The LTM®8061 is a high efficiency 32V, 2A μModule®
standalone Li-Ion battery charger. It is optimized for one
and two-cell packs, with fixed float voltage options: 4.1V,
4.2V, 8.2V and 8.4V. The LTM8061 provides a constant-
current/constant-voltage charge characteristic, with
maximum charge current up to 2A. A precondition feature
trickle charges a depleted battery, and bad battery detec-
tion provides a signal and suspends charging if a battery
does not respond to preconditioning.
n
Wide Input Voltage Range: 4.95V to 32V
(40V Absolute Maximum)
Float Voltage Options:
n
1-Cell: 4.1V, 4.2V
2-Cell: 8.2V, 8.4V
n
Programmable Charge Current: Up to 2A
n
User-Selectable Charge Termination: C/10 or
Onboard Termination Timer
n
Dynamic Charge Rate Programming/Soft-Start Pin
n
Programmable Input Current Limit
The LTM8061 can be configured to terminate charging
when charge current falls to one-tenth the programmed
maximum current or to use an internal timer if a time-
based termination scheme is desired. Once charging is
terminated, the LTM8061 enters a low current standby
mode. An auto-restart feature starts a new charge cycle if
the battery voltage drops 2.5% from the float voltage, or
if a new battery is inserted into a charging system.
n
Optional Reverse Input Protection
n
NTC Resistor Temperature Monitor
n
0.5% Float Voltage Accuracy
n
Bad-Battery Detection with Auto-Reset
n
Tiny, Low Profile (9mm × 15mm × 4.32mm) Surface
Mount LGA Package
APPLICATIONS
The LTM8061 is packaged in a thermally enhanced, com-
pact (9mm × 15mm × 4.32mm) over-molded land grid
array (LGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8061 is
RoHS compliant.
n
Industrial Handheld Instruments
n
12V to 24V Automotive and Heavy Equipment
n
Professional Video/Camera Chargers
L, LT, LTC, LTM, Linear Technology, Linear logo, μModule and PolyPhase are registered
trademarks and PowerPath is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners
TYPICAL APPLICATION
Standalone Single Cell 2A Li-Ion Battery Charger
with C/10 Termination from 6V to 32V Input
Battery Charging Profile
2500
NORMAL CHARGING
2000
LTM8061-4.1
V
IN
V
V
V
BAT
INA
INC
IN
6V TO 32V
SINGLE
CELL
/CLP
BIAS
+
1500
1000
4.1V
BATTERY
RUN
RNG/SS
TMR
CHRG
FAULT
4.7μF
AVAILABLE OPTIONS:
1-CELL: 4.1V, 4.2V
2-CELL: 8.2V, 8.4V
NTC
500
PRECONDITION
GND
8061 TA01a
TERMINATION
0
0
1
3
4
2
BATTERY VOLTAGE (V)
8061 TA01b
8061f
1
LTM8061
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(Note 1)
1
2
3
4
5
6
7
V
, V
, V ....................................................40V
INA INC/CLP IN
RUN, CHRG, FAULT...................................V + 0.5, 40V
A
B
C
D
E
F
IN
TMR, RNG/SS, NTC .................................................2.5V
BIAS, BAT .................................................................10V
Internal Operating Temperature
(Note 2)................................................................. 125°C
Maximum Body Solder Temperature..................... 245°C
BANK 2
BAT
BANK 1
GND
G
H
J
BIAS
RNG/SS
FAULT
CHRG
NTC
TMR
RUN
K
L
V
/CLP V
INA
V
IN
INC
BANK 5
BANK 4
LGA PACKAGE
BANK 3
77-LEAD (15mm s 9mm s 4.32mm)
T
= 125°C, θ = 17.0°C/W, θ = 16.2°C/W,
JMAX
JA
JCtop
θ
= 6.1°C/W, θ = 11.2°C/W,
JCbottom
JB
θ values determined per JEDEC 51-9, 51-12
Weight = 1.7g
ORDER INFORMATION
LEAD FREE FINISH
LTM8061EV-4.1#PBF
LTM8061IV-4.1#PBF
LTM8061EV-4.2#PBF
LTM8061IV-4.2#PBF
LTM8061EV-8.2#PBF
LTM8061IV-8.2#PBF
LTM8061EV-8.4#PBF
LTM8061IV-8.4#PBF
TRAY
PART MARKING*
LTM8061V-41
LTM8061V-41
LTM8061V-42
LTM8061V-42
LTM8061V-82
LTM8061V-82
LTM8061V-84
LTM8061V-84
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
LTM8061EV-4.1#PBF
LTM8061IV-4.1#PBF
LTM8061EV-4.2#PBF
LTM8061IV-4.2#PBF
LTM8061EV-8.2#PBF
LTM8061IV-8.2#PBF
LTM8061EV-8.4#PBF
LTM8061IV-8.4#PBF
77-Lead (15mm × 9mm × 4.32mm)
77-Lead (15mm × 9mm × 4.32mm)
77-Lead (15mm × 9mm × 4.32mm)
77-Lead (15mm × 9mm × 4.32mm)
77-Lead (15mm × 9mm × 4.32mm)
77-Lead (15mm × 9mm × 4.32mm)
77-Lead (15mm × 9mm × 4.32mm)
77-Lead (15mm × 9mm × 4.32mm)
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
8061f
2
LTM8061
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at TA = 25°C. RUN = 2V.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
Operating Voltage
Start Voltage
32
V
IN
IN
l
l
LTM8061-4.1/LTM8061-4.2
LTM8061-8.2/LTM8061-8.4
7.5
11.5
V
V
V
IN
V
IN
V
IN
OVLO Threshold
OVLO Hysteresis
UVLO Threshold
V
Rising
32
35
1
40
V
V
IN
LTM8061-4.1/LTM8061-4.2
LTM8061-8.2/LTM8061-8.4, V Rising
4.6
8.7
V
V
IN
V
V
UVLO Hysteresis
0.3
0.55
4.1
V
V
IN
to V /CLP Diode Forward Voltage Drop
V
Current = 2A
INA
INA
INC
BAT Float Voltage
LTM8061-4.1
LTM8061-4.2
LTM8061-8.2
LTM8061-8.4
4.08
4.06
4.18
4.16
8.16
8.12
8.36
8.32
4.12
4.14
4.22
4.24
8.24
8.28
8.44
8.48
V
V
V
V
V
V
V
V
l
l
l
l
4.2
8.2
8.4
Maximum BAT Charge Current
BAT Recharge Threshold Voltage
(Note 3)
1.70
2.0
A
LTM8061-4.1/LTM8061-4.2,
Relative to BAT Float Voltage
LTM8061-8.2/LTM8061-8.4,
Relative to BAT Float Voltage
–100
–200
mV
mV
BAT Precondition Threshold Voltage
LTM8061-4.1/LTM8061-4.2
LTM8061-8.2
LTM8061-8.4
2.9
5.65
5.80
V
V
V
BAT Precondition Threshold Hysteresis Voltage
Input Supply Current
90
mV
Standby Mode
RUN = 0.4V
85
15
μA
μA
Minimum BIAS Voltage for Proper Operation
2.9
V
mV
nA
V
V
INC
V
INC
/CLP Threshold Voltage
/CLP Input Bias Current
50
200
1.36
0.29
20
NTC Range Limit Voltage (High)
NTC Range Limit Voltage (Low)
NTC Threshold Hysteresis
NTC Disable Impedance
NTC Bias Current
V
V
Rising
Falling
1.25
1.45
NTC
0.265
0.315
V
NTC
For Both High and Low Range Limits
(Note 4)
%
250
47.5
45
500
50
kΩ
μA
μA
V/A
V
V
V
= 0.8V
Rising
52.5
55
NTC
RNG/SS Bias Current
50
Current Charge Programming: V
RUN Threshold Voltage
RUN Hysteresis Voltage
RUN Input Bias Current
/BAT Current
RNG/SS
0.42
1.15
0.50
1.20
120
1
0.58
1.25
RUN
mV
μA
V
CHRG, FAULT Output Low Voltage
TMR Charge/Discharge Current
TMR Disable Threshold Voltage
C/10 Termination Current
10mA Load
0.4
1.1
25
0.25
200
1
μA
V
0.1
0.9
RNG/SS Open
mA
MHz
8061f
Operating Frequency
3
LTM8061
ELECTRICAL CHARACTERISTICS
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.
specifications over the full –40°C to 125°C internal operating temperature
range. Note that the maximum internal temperature is determined by
specific operating conditions in conjunction with board layout, the rated
package thermal resistance and other environmental factors.
Note 3: The maximum BAT charge current is reduced by thermal foldback.
See the Typical Performance Characteristics section for details.
Note 4: Guaranteed by design and correlation.
Note 2: The LTM8061E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C internal
temperature range are assured by design, characterization and correlation
with statistical process controls. LTM8061I is guaranteed to meet
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs IBAT, 4.1VBAT
Efficiency vs IBAT, 4.2VBAT
Efficiency vs IBAT, 8.2VBAT
95
90
85
80
75
70
65
60
90
85
80
75
70
65
60
85
80
75
70
65
60
V
= 12V
V
= 12V
INA
INA
V
= 12V
INA
V
= 24V
INA
V
= 24V
INA
V
= 24V
INA
0
500
1500
2000
0
500
1500
2000
0
500
1500
2000
1000
(mA)
1000
(mA)
1000
I (mA)
BAT
I
I
BAT
BAT
8061 G03
8061 G01
8061 G02
Efficiency vs IBAT, 8.4VBAT
Input Current vs IBAT, 4.1VBAT
Input Current vs IBAT, 4.2VBAT
900
800
700
600
500
400
300
200
100
0
89
87
85
83
81
79
77
75
900
800
700
600
500
400
300
200
100
0
V
= 24V
INA
V
= 12V
INA
V
= 12V
INA
V
= 12V
INA
V
= 24V
INA
V
INA
= 24V
0
500
1500
2000
0
500
1500
2000
1000
(mA)
1000
(mA)
0
500
1500
2000
1000
(mA)
I
I
I
BAT
BAT
BAT
8061 G05
8061 G04
8061 G06
8061f
4
LTM8061
TYPICAL PERFORMANCE CHARACTERISTICS
Input Current vs IBAT, 8.2VBAT
Input Current vs IBAT, 8.4VBAT
IBIAS vs IBAT, 4.1VBAT
1600
1400
1200
1000
800
600
400
200
0
25
20
15
10
5
1600
1400
1200
1000
800
600
400
200
0
V
= 12V
INA
V
= 12V
INA
V
= 12V
INA
V
= 24V
INA
V
= 24V
INA
V
= 24V
INA
0
0
500
1500
2000
0
500
1500
2000
1000
(mA)
1000
I (mA)
BAT
0
500
1500
2000
1000
(mA)
I
I
BAT
BAT
8061 G07
8061 G09
8061 G08
IBIAS vs IBAT, 4.2VBAT
IBIAS vs IBAT, 8.2VBAT
IBIAS vs IBAT, 8.4VBAT
60
50
40
30
20
10
0
30
25
20
15
10
5
50
45
40
35
30
25
20
15
10
5
V
= 12V
V
= 12V
INA
INA
V
= 12V
INA
V
= 24V
1500
V
= 24V
INA
INA
V
= 24V
1500
INA
0
0
0
500
2000
1000
(mA)
0
500
2000
0
500
1000
I (mA)
BAT
1500
2000
1000
(mA)
I
I
BAT
BAT
8061 G12
8061 G10
8061 G11
Quiescent Current vs VINA
,
Input Standby Current
vs Temperature, 4.1VBAT
RNG/SS vs Maximum IBAT
RUN = 0V
1.2
1.0
0.8
0.6
0.4
0.2
0
6
5
4
3
2
1
0
80
70
60
50
40
30
20
10
0
V
= 12V
INA
V
INA
= 24V
0
500
1500
2000
1000
0
10
30
40
–50
0
100
50
20
(V)
BAT CURRENT (mA)
TEMPERATURE (°C)
V
INA
8061 G13
8061 G15
8061 G14
8061f
5
LTM8061
TYPICAL PERFORMANCE CHARACTERISTICS
Input Standby Current
vs Temperature, 4.2VBAT
Input Standby Current
vs Temperature, 8.2VBAT
Input Standby Current
vs Temperature, 8.4VBAT
7
6
5
4
3
2
1
0
10
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
V
= 12V
V
= 12V
V
= 12V
V
INA
INA
INA
V
= 24V
INA
= 24V
V
INA
= 24V
INA
–50
0
100
–50
0
100
50
–50
0
100
50
50
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
8061 G16
8061 G18
8061 G17
Temperature Rise vs IBAT, 4.1VBAT
Temperature Rise vs IBAT, 4.2VBAT
30
25
20
15
10
5
30
25
20
15
10
5
V
= 24V
INA
V
= 24V
INA
V
= 12V
1500
INA
V
= 12V
1000
INA
0
0
0
500
2000
1000
(mA)
0
500
1500
2000
I
I
(mA)
BAT
BAT
8061 G20
8061 G19
Temperature Rise vs IBAT, 8.2VBAT
Temperature Rise vs IBAT, 8.4VBAT
40
35
30
25
20
15
10
5
35
30
25
20
15
10
5
V
= 12V
INA
V
= 12V
INA
V
= 24V
V
= 24V
INA
INA
0
0
0
500
1500
2000
1000
(mA)
0
500
1500
2000
1000
(mA)
I
I
BAT
BAT
8061 G22
8061 G21
8061f
6
LTM8061
PIN FUNCTIONS
GND (Bank 1): Power and Signal Ground Return.
CHRG (Pin K7): Open-Collector Charger Status Output.
Typically pulled up through a resistor to a reference volt-
age. This status pin can be pulled up to voltages as high
BAT (Bank 2): Battery Charge Current Output Bus. The
charge function operates to achieve the final float voltage
at this pin. The auto-restart feature initiates a new charge
cycle when the voltage at the BAT pin falls 2.5% below
the float voltage. Once the charge cycle is terminated, the
input bias current of the BAT pin is reduced to minimize
battery discharge while the charger remains connected.
In most applications, connect BIAS to BAT.
as V and can sink currents up to 10mA. During a battery
IN
charge cycle, CHRG is pulled low. When the charge cycle
terminates, the CHRG pin becomes high impedance. If
the internal timer is used for termination, the pin stays
low during the charge cycle until the charge current drops
below a C/10 rate even though the charger will continue to
topoffthebatteryuntiltheend-of-chargetimerterminates
the charge cycle. A temperature fault also causes this pin
to be pulled low (see the Applications Information sec-
tion). If RUN is low, or the LTM8061 is otherwise powered
down, the state of the CHRG pin is invalid.
V
(Bank3):AnodeofInputReverseProtectionSchottky
INA
Diode. Connect the input power here if input voltage
protection is desired.
V
/CLP (Bank 4):This pad bank connectsto thecathode
INC
of the input reverse protection diode. In addition, system
NTC (Pin H6): Battery Temperature Monitor Pin. This pin
is the input to the NTC (negative temperature coefficient)
thermistortemperaturemonitoringcircuit.Thisfunctionis
enabled by connecting a 10kꢀ, β = 3380 NTC thermistor
from the NTC pin to ground. The pin sources 50ꢁA, and
monitors the voltage across the 10kꢀ thermistor. When
the voltage on this pin is above 1.36V (T < 0°C) or below
0.29V (T > 40°C), charging is disabled and the CHRG and
FAULT pins are both pulled low. If internal timer termina-
tion is being used, the timer is paused, suspending the
charge cycle. Charging resumes when the voltage on NTC
returns to within the 0.29V to 1.36V active region. There
isapproximately5°Coftemperaturehysteresisassociated
with each of the temperature thresholds. The temperature
monitoring function remains enabled while thermistor
resistance to ground is less than 250kꢀ. If this function
is not desired, leave the NTC pin unconnected.
current levels can be monitored by connecting a sense
resistor from this pin to the V pin. Additional system
IN
load is drawn from the V pin connection, and maximum
IN
systemloadisachievedwhenV
–V =50mV.The
VINC/CLP
VIN
LTM8061 servos the charge current required to maintain
programmed maximum system current. If this function is
not desired, connect the V /CLP pin to the V pin (see
INC
IN
the Applications Information section). Do not raise this
pin above V + 0.5V.
IN
V (Bank 5): Charger Input Supply. Apply C here. Con-
IN
IN
nect the input power here if no input power rectification
is required.
BIAS(PinG7):TheBIASpinconnectstotheinternalpower
bus. Connect to a power source greater than 2.5V and less
than 10V. In most applications, connect BIAS to BAT.
8061f
7
LTM8061
PIN FUNCTIONS
FAULT (Pin J7): Open-Collector Fault Status Output. Typi-
cally pulled up through a resistor to a reference voltage.
This status pin can be pulled up to voltages as high as
RNG/SS (Pin H7): Charge Current Programming/Soft-
Start Pin. This pin allows the maximum charge current
to be reduced from the default 2A level, and can be used
to employ a soft-start function. This pin has an effective
range from 0V to 1V, with the maximum BAT charge cur-
V , and can sink currents up to 10mA. This pin indicates
IN
chargecyclefaultconditionsduringabatterychargecycle.
A temperature fault causes this pin to be pulled low. If the
internal timer is used for termination, a bad battery fault
also causes this pin to be pulled low. If no fault condi-
tions exist, the FAULT pin remains high impedance (see
the Applications Information section). If RUN is low, or
the LTM8061 is otherwise powered down, the state of the
FAULT pin is invalid.
rent determined by I
.
BAT
50ꢁA is sourced from this pin, so the maximum charge
current can be programmed by connecting a resistor
(R
) from RNG/SS to ground, and the maximum
RNG/SS
battery charge current is:
I
I
= 2A • V
RNG/SS
BAT
BAT
= 2A • 50ꢁA • R
TMR (Pin J6): End-Of-Cycle Timer Programming Pin.
If a timer-based charge termination is desired, connect
a capacitor from this pin to ground. Full charge end-of
cycle time (in hours) is programmed with this capacitor
following the equation:
RNG/SS
where R
is less than or equal to 20kΩ. With the
RNG/SS
RNG/SS pin left open, the charge current is 2A.
Soft-start functionality can be implemented by connect-
ing a capacitor (C
) from RNG/SS to ground, such
RNG/SS
6
t
= C
• 4.4 • 10
TIMER
EOC
that the time required to charge the capacitor to 1V (full
chargecurrent)isthedesiredsoft-startinterval(t ).With
A bad battery fault is generated if the battery does not
reachthepreconditionthresholdvoltagewithinone-eighth
SS
no R
resistor applied, this capacitor value follows
RNG/SS
the relation:
of t , or:
EOC
5
C
= 50ꢁA • t
t
= C
• 5.5 • 10
TIMER
RNG/SS
SS
PRE
The RNG/SS pin is pulled low during fault conditions,
allowing graceful recovery from faults should soft-start
functionality be implemented. Both the soft-start capaci-
tor and the programming resistor can be implemented in
parallel. All C/10 monitoring functions are disabled while
A 0.68ꢁF capacitor is typically used, which generates a
timer EOC of three hours, and a precondition limit time of
22.5 minutes. If a timer-based termination is not desired,
the timer function is disabled by connecting the TMR pin
to ground. With the timer function disabled, charging
terminates when the charge current drops below a C/10
V
is below 0.1V to accommodate long soft-start
RNG/SS
intervals.
rate, or I
/10.
CHG(MAX)
RNG/SS voltage can also be manipulated using an active
device,employingapull-downtransistortodisablecharge
current or to dynamically servo maximum charge current.
Manipulation of the RNG/SS pin with active devices that
have low impedance pull-up capability is not allowed (see
the Applications Information section).
RUN (Pin K6): Precision Threshold Enable Pin. The RUN
threshold is 1.20V (rising), with 120mV of input hystere-
sis. When in shutdown mode, all charging functions are
disabled. The precision threshold allows use of the RUN
pin to incorporate UVLO functions. If the RUN pin is pulled
below 0.4V, the μModule enters a low current shutdown
modewheretheV pincurrentisreducedto15ꢁA.Typical
IN
RUNpininputbiascurrentis1μA.Iftheshutdownfunction
is not desired, connect the pin to the V pin.
IN
8061f
8
LTM8061
BLOCK DIAGRAM
V
V
/CLP
V
IN
INA
INC
SENSE
RESISTOR
BAT
8.2μH
10μF
0.1μF
0.1μF
BIAS
INTERNAL
COMPENSATION
CURRENT
MODE
RUN
BATTERY
RNG/SS
TMR
MANAGEMENT
CONTROLLER
NTC
GND
FAULT
CHRG
8061 BD
8061f
9
LTM8061
APPLICATIONS INFORMATION
Overview
TheLTM8061canuseachargecurrentbasedC/10termina-
tion scheme, which ends a charge cycle when the battery
charge current falls to one-tenth the programmed charge
current.TheLTM8061alsocontainsaninternalchargecycle
controltimer, fortimer-basedtermination. Whenusingthe
internal timer, the charge cycle can continue beyond the
C/10 level to top-off a battery. The charge cycle terminates
when the programmed time elapses, typically chosen to
be three hours. The CHRG status pin continues to signal
charging at a C/10 rate, regardless of which termination
scheme is used. When the timer-based scheme is used,
the device also supports bad battery detection, which
triggers a system fault if a battery stays in precondition
mode for more than one-eighth of the total programmed
charge cycle time.
The LTM8061 is a complete monolithic, mid-power, Li-Ion
batterycharger,addressinghighinputvoltageapplications
withsolutionsthatuseaminimumofexternalcomponents.
The product is available in four variants: 4.1V, 4.2V, 8.2V
and 8.4V fixed float voltages, each using 1MHz constant-
frequency,averagecurrentmodestep-downarchitecture.A
2A power Schottky diode is integrated within the μModule
for reverse input voltage protection. A wide input range
allows the operation to full charge from 6V to 32V for
the LTM8061-4.1/LTM8061-4.2 and 11V to 32V for the
LTM8061-8.2/LTM8061-8.4versions.Aprecisionthreshold
RUN pin allows incorporation of UVLO functionality using
a simple resistor divider. The charger can also be put into
a low current shutdown mode, in which the input supply
bias is reduced to only 15ꢁA.
Once charging terminates and the LTM8061 is not actively
charging, the device automatically enters a low current
standby mode in which supply bias currents are reduced
to 85ꢁA. If the battery voltage drops 2.5% from the full
charge float voltage, the LTM8061 engages an automatic
chargecyclerestart.Thedevicealsoautomaticallyrestarts
a new charge cycle after a bad-battery fault once the failed
battery is removed and replaced with another battery.
The LTM8061 incorporates several degrees of charge
current control freedom. The maximum charge current
is internally set to approximately 2A. A maximum charge
currentprogrammingpin(RNG/SS)allowsthechargecur-
rent to be reduced from the default 2A level. The LTM8061
also incorporates an input supply current limit control
feature (V /CLP) that servos the battery charge current
to accommodate overall system load requirements.
INC
The LTM8061 contains a battery temperature monitoring
circuit. This feature, using a thermistor, monitors battery
temperature and will not allow charging to begin, or will
suspendcharging,andsignalafaultconditionifthebattery
temperatureisoutsideasafechargingrange.TheLTM8061
containstwodigitalopen-collectoroutputs,whichprovide
charger status and signal fault conditions. These binary
coded pins signal battery charging, standby or shutdown
modes, battery temperature faults and bad battery faults.
For reference, C/10 and TMR based charging cycles are
shown in Figures 1 and 2.
The LTM8061 automatically enters a battery precondition
mode if the sensed battery voltage is very low. In this
mode, the charge current is reduced to 300mA. Once the
batteryvoltageclimbsabovetheinternallysetprecondition
threshold(2.9VfortheLTM8061-4.1/LTM8061-4.2,5.65V
for the LTM8061-8.2, and 5.8V for the LTM8061-8.4), the
μModule automatically increases the maximum charge
current to the full programmed value.
8061f
10
LTM8061
APPLICATIONS INFORMATION
FLOAT VOLTAGE
RECHARGE THRESHOLD
BATTERY VOLTAGE
PRECONDITION THRESHOLD
MAXIMUM CHARGE CURRENT
BATTERY CHARGE
CURRENT
PRECONDITION CURRENT
C/10
0 AMPS
1
CHRG
FAULT
0
1
0
1
RUN
0
8061 F01
Figure 1. Typical C/10 Terminated Charge Cycle (TMR Grounded, Time Not to Scale)
FLOAT VOLTAGE
RECHARGE THRESHOLD
BATTERY VOLTAGE
PRECONDITION THRESHOLD
MAXIMUM CHARGE CURRENT
BATTERY CHARGE
CURRENT
PRECONDITION CURRENT
C/10 CURRENT
1
CHRG
0
FAULT
1
0
1
RUN
0
< t /8
EOC
t
EOC
AUTOMATIC
RESTART
8061 F02
Figure 2. Typical EOC (Timer-Based) Terminated Charge Cycle (Capacitor Connected to TMR, Time Not to Scale)
8061f
11
LTM8061
APPLICATIONS INFORMATION
V Input Supply
IN
The optimum ESR is about 100mΩ, but ESR values both
higher and lower will work. Table 1 shows a sample of
parts verified by Linear Technology:
The LTM8061 is biased directly from the charger input
supply through the V pin. This pin carries large switched
IN
currents, so a high quality, low ESR decoupling capacitor
Table 1. Recommended BAT Capacitors
is recommended to minimize voltage glitches on V . A
PART NUMBER
DESCRIPTION
MANUFACTURER
Sanyo
IN
4.7μF capacitor is typically adequate for most charger
16TQC22M
22μF, 16V, POSCAP
18μF, 35V, OS-CON
22μF, 25V Tantalum
22μF, 25V, Tantalum
68μF, 6V, Tantalum
47μF, 6V, Tantalum
68μF, 10V Aluminum
68μF, 25V Aluminum
applications.
35SVPD18M
Sanyo
TPSD226M025R0100
T495D226K025AS
TPSC686M006R0150
TPSB476M006R0250
APXE100ARA680ME61G
APS-150ELL680MHB5S
AVX
Reverse Protection Diode
Kemet
The LTM8061 integrates a high voltage power Schottky
diode to provide input reverse voltage protection. The
AVX
AVX
anode of this diode is connected to V , and the cathode
Nippon Chemicon
Nippon Chemicon
INA
isconnectedtoV .Thereisasmallamountofcapacitance
IN
at each end; please see the Block Diagram.
If system constraints preclude the use of electrolytic ca-
pacitors, aseriesR-Cnetworkmaybeused. Useaceramic
capacitor of at least 22μF and an equivalent resistance of
100mΩ.
BIAS Pin Considerations
TheBIASpinisusedtoprovidedrivepowerfortheinternal
powerswitchingstageandoperateotherinternalcircuitry.
For proper operation, it must be powered by at least 2.9V
and no more than the absolute maximum rating of 10V. In
most applications, connect BIAS to BAT.
CLP: Input Current Limit
The LTM8061 contains a PowerPath™ control feature to
supportmultipleloadsystems.Thechargeradjustscharge
currentinresponsetoasystemloadifinputsupplycurrent
exceedstheprogrammedmaximumvalue.Maximuminput
Whencharginga2-cellbatteryusingarelativelyhighinput
voltage, the LTM8061 power dissipation can be reduced
by connecting BIAS to a 3.3V source.
supplycurrentissetbyconnectingasenseresistor(R
)
CLP
as shown in Figure 3. The LTM8061 begins to limit the
charge current when the voltage across the sense resistor
is 50mV. The maximum input current is defined by:
BAT Decoupling Capacitance
In many applications, the internal BAT capacitance of the
LTM8061issufficientforproperoperation.Therearecases,
however, where it may be necessary to add capacitance or
otherwise modify the output impedance of the LTM8061.
Case 1: the μModule charger is physically located far from
thebatteryandtheaddedlineimpedancemayinterferewith
the control loop. Case 2: the battery ESR is very small or
very large; the LTM8061 controller is designed for a wide
range, but some battery packs have an ESR outside of this
range. Case 3: there is no battery at all. As the charger is
designed to work with the ESR of the battery, the output
may oscillate if no battery is present.
R
= 0.05/(Max Input Current)
CLP
SYSTEM LOAD
LTM8061
R
CLP
INPUT SUPPLY
V
IN
V
/CLP
INC
8061 F03
Figure 3. RCLP Sets the Input Supply Current Limit
8061f
12
LTM8061
APPLICATIONS INFORMATION
A 1.5A system limit, for example, would use a 33mꢀ
sense resistor. Figure 4 gives an example of the system
current for the situation where the input current happens
to be 1A, and then gets reduced as the additional system
load increases beyond 0.5A. The LTM8061 integrates
the CLP signal internally, so average current limiting is
performed in most cases without the need for external
filter elements.
For example, to reduce the maximum charge current to
50% of the original value, set RNG/SS to 0.5V. The neces-
sary resistor value is:
R
= 0.5V/50μA = 10kꢀ
RNG/SS
This feature could be used, for example, to switch in a
reduced charge current level. Applying an active voltage
can also be used to control the maximum charge current
but only if the voltage source can sink current. Figures 5
and 6 give two examples of circuits that control the charg-
ing current by sinking current. Active circuits that source
current cannot be used to drive the RNG/SS pin. Care
must be taken not to exceed the 2.5V absolute maximum
voltage on the pin.
SYSTEM LOAD
CURRENT
1.5A
1.0A
0.5A
LTM8061 INPUT
CURRENT (I
)
VIN
LTM8061
RNG/SS
10k
8061 F05
8061 F04
LOGIC HIGH = HALF CURRENT
Figure 4. LTM8061 Input Current vs System
Load Current with 1.5A Input Current Limit
Figure 5. Using the RNG/SS Pin for Digital Control of
Maximum Charge Current
RNG/SS: Dynamic Charge Current Adjust
The LTM8061 gives the user the capability to reduce the
maximumchargecurrentdynamicallythroughtheRNG/SS
pin. The maximum charge current of the LTM8061 is 2A
and the control voltage range on the RNG/SS pin is 1V, so
the maximum charge current can be expressed as:
LTM8061
RNG/SS
+
–
8061 F06
I
= 2A • V
RNG/SS
BAT
SERVO REFERENCE
where I is the maximum charge current and V
is
BAT
RNG/SS
between 0V to 1V. Voltages higher than 1V have no effect
on the maximum charge current.
Figure 6. Driving the RNG/SS Pin with a
Current-Sink Active Servo Amplifier
The LTM8061 sources 50μA from the RNG/SS pin, such
thatacurrentcontrolvoltagecanbesetbysimplyconnect-
ing an appropriately valued resistor to ground, following
the equation:
R
= V
/50μA
RNG/SS
RNG/SS
8061f
13
LTM8061
APPLICATIONS INFORMATION
RNG/SS: Soft-Start
If the battery is removed from an LTM8061 charger that is
configuredforC/10termination,alowamplitudesawtooth
waveform appears at the charger output, due to cycling
between termination and recharge events. This cycling
results in pulsing at the CHRG output. An LED connected
to this pin will exhibit a blinking pattern, indicating to the
user that a battery is not present. The frequency of this
blinking pattern is dependent on the output capacitance.
Soft-start functionality is also supported by the RNG/SS
pin. 50μA is sourced from the RNG/SS pin, so connect-
ing a capacitor from the RNG/SS pin to ground (C
in Figure 7) creates a linear voltage ramp. The maximum
chargecurrentfollowsthisvoltage.Thus,thechargecurrent
increases from zero to the fully programmed value as the
RNG/SS
capacitor charges from 0V to 1V. The value of C
is
SS
RNG/SS
calculated based on the desired time to full current (t )
C/10 Termination
following the equation:
The LTM8061 supports a low current based termination
scheme, where a battery charge cycle terminates when
the charge current falls below one-tenth the programmed
chargecurrent, orabout200mA. Thisterminationmodeis
engaged by shorting the TMR pin to ground. When C/10
termination is used, an LTM8061 charger sources battery
chargecurrentaslongastheaveragecurrentlevelremains
abovetheC/10threshold.Asthefull-chargefloatvoltageis
achieved, the charge current falls until the C/10 threshold
is reached, at which time the charger terminates and the
LTM8061 enters standby mode. The CHRG status is high
impedance when the charger is sourcing less than C/10.
There is no provision for bad-battery detection if C/10
termination is used.
C
= 50μA • t
SS
RNG/SS
TheRNG/SSpinispulledtogroundinternallywhencharg-
ing terminates so each new charge cycle begins with a
soft-start cycle. RNG/SS is also pulled to ground during
bad-batteryandNTCfaultconditions,producingagraceful
recovery from a fault.
LTM8061
RNG/SS
C
RNG/SS
8061 F07
Figure 7. Using the RNG/SS Pin for Soft-Start
Timer Termination
Status Pins
TheLTM8061supportsatimer-basedterminationscheme,
where a battery charge cycle terminates after a specific
amount of time elapses. Timer termination is enabled
TheLTM8061reportschargerstatusthroughtwoopen-col-
lector outputs, the CHRG and FAULT pins. These pins can
accept voltages as high as V , and can sink up to 10mA
IN
by connecting a capacitor (C
) from the TMR pin to
TIMER
when enabled. The CHRG pin indicates that the charger is
delivering current at greater than a C/10 rate, or one-tenth
of the programmed charge current. The FAULT pin signals
bad-battery and NTC faults. These pins are binary coded
as shown in Table 2:
GND. The timer cycle time span (t ) is determined by
EOC
C
in the equation:
TIMER
–7
C
= t
• 2.27 • 10 (Hours)
TIMER
EOC
When charging at a 1C rate, t
is commonly set to three
EOC
hours, which requires a 0.68ꢁF capacitor.
Table 2. Status Pin State
TheCHRGstatuspincontinuestosignalcharging, regard-
less of which termination scheme is used. When timer
termination is used, the CHRG status pin is pulled low
during a charge cycle until the charge current falls below
the C/10 threshold. The charger continues to top off the
battery until timer EOC, when the LTM8061 terminates the
charge cycle and enters standby mode.
CHRG
FAULT
STATUS
High
High
Standby, Shutdown Mode, or Charging at
Less than C/10
High
Low
Bad-Battery Fault (Precondition Timeout/
EOC Failure)
Low
Low
High
Low
Normal Charging at C/10 or Greater
NTC Fault (Pause)
8061f
14
LTM8061
APPLICATIONS INFORMATION
above the preconditioning threshold voltage and initiate a
charge cycle reset. A new charge cycle is started by con-
necting another battery to the charger output.
Termination at the end of the timer cycle only occurs if the
charge cycle was successful. A successful charge cycle
occurs when the battery is charged to within 2.5% of the
full-charge float voltage. If a charge cycle is not success-
ful at EOC, the timer cycle resets and charging continues
Battery Temperature Fault: NTC
for another full timer cycle. When V drops 2.5% from
BAT
The LTM8061 can accommodate battery temperature
monitoring by using an NTC (negative temperature coef-
ficient) thermistor close to the battery pack. The tem-
perature monitoring function is enabled by connecting
a 10kꢀ, β = 3380 NTC thermistor from the NTC pin to
ground. If the NTC function is not desired, leave the pin
unconnected. The NTC pin sources 50μA, and monitors
thevoltagedroppedacrossthe10kꢀthermistor.Whenthe
voltage on this pin is above 1.36V (0°C) or below 0.29V
(40°C), the battery temperature is out of range, and the
LTM8061 triggers an NTC fault. The NTC fault condition
remains until the voltage on the NTC pin corresponds to
a temperature within the 0°C to 40°C range. Both hot and
coldthresholdsincorporate20%hysteresis,whichequates
to about 5°C. If higher operational charging temperatures
are desired, the temperature range can be expanded by
adding series resistance to the 10k NTC resistor. Adding
a 909ꢀ resistor will increase the effective temperature
threshold to 45°C, for example.
the full-charge float voltage, whether by battery loading
or replacement of the battery, the charger automatically
resets and starts charging.
Preconditioning and Bad-Battery Fault
The LTM8061 has a precondition mode, in which charge
current is limited to 15% of the maximum charge current,
roughly 300mA. Precondition mode is engaged if the volt-
age on the BAT pin is below the precondition threshold,
or approximately 70% of the float voltage. Once the BAT
voltage rises above the precondition threshold, normal
full-current charging can commence. The LTM8061
incorporates 90mV hysteresis to avoid spurious mode
transitions.
Bad-battery detection is engaged when using timer termi-
nation. This fault detection feature is designed to identify
failed cells. A bad-battery fault is triggered when the volt-
age on BAT remains below the precondition threshold for
greater than one-eighth of a full timer cycle (one-eighth
EOC). A bad-battery fault is also triggered if a normally
charging battery re-enters precondition mode after one-
eighth EOC.
During an NTC fault, charging is halted and both status
pins are pulled low. If timer termination is enabled, the
timer count is suspended and held until the fault condi-
tion is cleared. The RNG/SS pin is also pulled low during
this fault to accommodate a graceful restart in the event
that a soft-start function is being incorporated (see the
RNG/SS: Soft-Start section).
When a bad-battery fault is triggered, the charge cycle
is suspended, and the CHRG status pin becomes high
impedance. The FAULT pin is pulled low to signal that a
fault has been detected. The RNG/SS pin is also pulled
low during this fault to accommodate a graceful restart
in the event that a soft-start function is incorporated (see
the RNG/SS: Soft-Start section).
Thermal Foldback
TheLTM8061containsathermalfoldbackprotectionfeature
that reduces charge current as the internal temperature
approaches 125°C. In most cases, internal temperatures
servosuchthatanyovertemperatureconditionsarerelieved
with only slight reductions in maximum charge current.
In some cases, the thermal foldback protection feature
can reduce charge currents below the C/10 threshold. In
applications that use C/10 termination (TMR = 0V), the
LTM8061 will suspend charging and enter standby mode
until the overtemperature condition is relieved.
Cyclingthecharger’spowerorshutdownfunctioninitiates
a new charge cycle, but the LTM8061 charger does not
requireamanualreset.Onceabad-batteryfaultisdetected,
a new timer charge cycle initiates if the BAT pin exceeds
the precondition threshold voltage. During a bad-battery
fault,asmallcurrentissourcedfromthecharger;removing
the failed battery allows the charger output voltage to rise
8061f
15
LTM8061
APPLICATIONS INFORMATION
PCB Layout
5. Forgoodheatsinking,useviastoconnecttheGNDcop-
per area to the board’s internal ground planes. Liberally
distributetheseGNDviastoprovidebothagoodground
connectionandthermalpathtotheinternalplanesofthe
printed circuit board. Pay attention to the location and
density of the thermal vias in Figure 8. The LTM8061
can benefit from the heat-sinking afforded by vias that
connecttointernalGNDplanesattheselocations,dueto
theirproximitytointernalpowerhandlingcomponents.
The optimum number of thermal vias depends upon
the printed circuit board design. For example, a board
might use very small via holes. It should employ more
thermal vias than a board that uses larger holes.
Most of the headaches associated with PCB layout have
been alleviated or even eliminated by the high level of
LTM8061 integration. The LTM8061 is nevertheless
a switching power supply, and care must be taken to
minimize EMI and ensure proper operation. Even with the
high level of integration, you may fail to achieve specified
operation with a haphazard or poor layout. See Figure 8
for a suggested layout. Ensure that the grounding and
heat sinking are acceptable.
1. Place the C capacitor as close as possible to the V
IN
IN
and GND connection of the LTM8061.
2. If used, place the C
capacitor as close as possible
BAT
Hot-Plugging Safely
to the BAT and GND connection of the LTM8061.
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LTM8061. However, these capacitors
can cause problems if the LTM8061 is plugged into a live
input supply (see Application Note 88 for a complete dis-
cussion). The low loss ceramic capacitor combined with
stray inductance in series with the power source forms an
3. PlacetheC andC (ifused)capacitorssuchthattheir
IN
BAT
ground current flows directly adjacent or underneath
the LTM8061.
4. Connect all of the GND connections to as large a copper
pour or plane area as possible on the top layer. Avoid
breaking the ground connection between the external
components and the LTM8061.
underdamped tank circuit, and the voltage at the V pin
IN
C
SS
BAT
(OPTIONAL)
V
V
INA
RUN
C
BAT
(OPTIONAL)
/CLP
INC
CLP SENSE
RESISTOR
C
IN
GND
V
IN
8061 F08
THERMAL VIAS
Figure 8. Layout Showing Suggested External
Components, Power Planes and Thermal Vias
8061f
16
LTM8061
APPLICATIONS INFORMATION
of the LTM8061 can ring to more than twice the nominal
input voltage, possibly exceeding the LTM8061’s rating
and damaging the part. If the input supply is poorly con-
trolled or the user will be plugging the LTM8061 into an
energized supply, the input network should be designed
to prevent this overshoot. This can be accomplished by
thermal coefficients are determined for maximum output
power per JESD 51-9, “JEDEC Standard, Test Boards for
Area Array Surface Mount Package Thermal Measure-
ments” through analysis and physical correlation. Bear in
mind that the actual thermal resistance of the LTM8061
to the printed circuit board depends upon the design of
the circuit board.
installing a small resistor in series to V , but the most
IN
popular method of controlling input voltage overshoot is
The internal temperature of the LTM8061 must be lower
than the maximum rating of 125°C, so care should be
taken in the layout of the circuit to ensure good heat
sinking of the LTM8061. The bulk of the heat flow out of
the LTM8061 is through the bottom of the module and
the LGA pads into the printed circuit board. Consequently
a poor printed circuit board design can cause excessive
heating, resulting in impaired performance or reliability.
Please refer to the PCB Layout section for printed circuit
board design suggestions.
to add an electrolytic bulk capacitor to the V net. This
IN
capacitor’s relatively high equivalent series resistance
damps the circuit and eliminates the voltage overshoot.
The extra capacitor improves low frequency ripple filter-
ing and can slightly improve the efficiency of the circuit,
though it is physically large.
Thermal Considerations
The temperature rise curves given in the Typical Perfor-
mance Characteristics section gives the thermal perfor-
manceoftheLTM8061.Thesecurvesweregeneratedbythe
The LTM8061 is equipped with a thermal foldback that
reduces the charge current as the internal temperature
approaches 125°C. This does not mean that it is impos-
sible to exceed the 125°C maximum internal temperature
rating. The ambient operating condition and other factors
may result in high internal temperatures.
2
LTM8061 mounted to a 58cm 4-layer FR4 printed circuit
board. Boards of other sizes and layer count can exhibit
differentthermalbehavior,soitisincumbentupontheuser
to verify proper operation over the intended system’s line,
load and environmental operating conditions.
Finally, be aware that at high ambient temperatures the
internalSchottkydiodewillhavesignificantleakagecurrent
increasing the quiescent current of the LTM8061.
The junction to air and junction to board thermal resis-
tances given in the Pin Configuration diagram may also be
usedtoestimatetheLTM8061internaltemperature.These
TYPICAL APPLICATIONS
Single Cell 2A Li-Ion Battery Charger with 3 Hour
Timer Termination and Reverse Input Protection
Two Cell 1A Li-Ion Battery Charger with C/10
Termination and Reverse Input Protection
LTM8061-4.2
LTM8061-8.4
V
V
IN
IN
V
V
V
BAT
V
V
V
BAT
INA
INC
IN
INA
INC
IN
6V TO 32V
11.5V TO 32V
/CLP
BIAS
/CLP
BIAS
SINGLE
CELL
TWO
+
+
CELL
4.2V
8.4V
BATTERY
RUN
RUN
BATTERY
RNG/SS
TMR
CHRG
FAULT
RNG/SS
TMR
CHRG
FAULT
4.7μF
4.7μF
NTC
NTC
GND
GND
0.68μF
10k
(1A CHARGE
CURRENT)
8061 TA03
8061 TA02
8061f
17
LTM8061
PACKAGE DESCRIPTION
Z
/ / b b b
Z
3 . 8 1 0
2 . 5 4 0
1 . 2 7 0
0 . 0 0 0
1 . 2 7 0
2 . 5 4 0
3 . 8 1 0
1 . 5 8 7 5
0 . 9 5 2 5
3 . 4 9 2 5
4 . 1 2 7 5
8061f
18
LTM8061
PACKAGE DESCRIPTION
Table 3. Pin Assignment Table
(Arranged by Pin Number)
PIN NUMBER
PIN NUMBER
PIN NUMBER
PIN NUMBER
PIN NUMBER
PIN NUMBER
A1
A2
A3
A4
A5
A6
A7
GND
GND
GND
GND
GND
BAT
B1
B2
B3
B4
B5
B6
B7
GND
GND
GND
GND
GND
BAT
C1
C2
C3
C4
C5
C6
C7
GND
GND
GND
GND
GND
BAT
D1
D2
D3
D4
D5
D6
D7
GND
GND
GND
GND
GND
BAT
E1
GND
GND
GND
GND
GND
BAT
F1
F2
F3
F4
F5
F6
F7
GND
E2
E3
E4
E5
E6
E7
GND
GND
GND
GND
BAT
BAT
BAT
BAT
BAT
BAT
BAT
PIN NUMBER
PIN NUMBER
PIN NUMBER
PIN NUMBER
PIN NUMBER
G1
G2
G3
G4
G5
G6
G7
GND
GND
GND
GND
GND
GND
BIAS
H1
H2
H3
H4
H5
H6
H7
GND
GND
J1
J2
J3
J4
J5
J6
J7
GND
GND
GND
GND
GND
TMR
FAULT
K1
K2
K3
K4
K5
K6
K7
V
V
L1
L2
V
V
IN
IN
IN
IN
GND
V
V
/CLP L3
/CLP L4
V
V
/CLP
INC
INC
INC
INC
GND
/CLP
GND
V
L5
L6
L7
V
V
V
INA
INA
INA
INA
NTC
RUN
RNG/SS
CHRG
PACKAGE PHOTOGRAPH
8061f
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
19
LTM8061
TYPICAL APPLICATION
Two Cell 2A Li-Ion Battery Charger with Thermistor, C/10
Termination and Reverse Input Protection
LTM8061-8.4
V
IN
V
V
V
BAT
INA
INC
IN
11.5V TO 32V
/CLP
BIAS
TWO
+
CELL
RUN
B = 3380
THERMISTOR
8.4V
t°
BATTERY
RNG/SS
TMR
CHRG
FAULT
4.7μF
NTC
GND
8061 TA04
RELATED PARTS
PART NUMBER
DESCRIPTION
10A DC/DC μModule Regulator
COMMENTS
LTM4600
Basic 10A DC/DC μModule, 15mm × 15mm × 2.8mm LGA
–55°C to 125°C Operation, 15mm × 15mm × 2.8mm LGA
LTM4600HVMPV Military Plastic 10A DC/DC μModule Regulator
LTM4601/
LTM4601A
12A DC/DC μModule Regulator with PLL, Output
Synchronizable, PolyPhase® Operation, LTM4601-1 Version Has No Remote
Sensing
Tracking/Margining and Remote V
Sensing
OUT
LTM4602
LTM4603
6A DC/DC μModule Regulator
Pin Compatible with the LTM4600
6A DC/DC μModule Regulator with PLL and Output Synchronizable, PolyPhase Operation, LTM4603-1 Version Has No Remote
Tracking/Margining and Remote V Sensing Sensing, Pin Compatible with the LTM4601
OUT
LTM4604
LTM4608
LTM8020
LTM8022
4A Low V DC/DC μModule Regulator
2.375V ≤ V ≤ 5V, 0.8V ≤ V
≤ 5V, 9mm × 15mm × 2.3mm LGA
IN
IN
OUT
OUT
8A Low V DC/DC μModule Regulator
2.375V ≤ V ≤ 5V, 0.8V ≤ V
≤ 5V, 9mm × 15mm × 2.8mm LGA
≤ 5V, 6.25mm × 6.25mm × 2.32mm LGA
IN
IN
200mA, 36V DC/DC μModule Regulator
1A, 36V DC/DC μModule Regulator
Fixed 450kHz Frequency, 1.25V ≤ V
OUT
Adjustable Frequency, 0.8V ≤ V
Pin Compatible to the LTM8023
≤ 5V, 9mm × 11.25mm × 2.82mm LGA,
OUT
LTM8023
LTM8025
2A, 36V DC/DC μModule Regulator
3A, 36V DC/DC μModule Regulator
Adjustable Frequency, 0.8V ≤ V
≤ 5V, 9mm × 11.25mm × 2.82mm LGA,
OUT
Pin Compatible to the LTM8022
0.8V ≤ V ≤ 24V, 9mm × 15mm × 4.32mm LGA
OUT
8061f
LT 0910 • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
20
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© LINEAR TECHNOLOGY CORPORATION 2010
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
相关型号：
LTM8062EV#PBF
LTM8062 - 32VIN, 2A µModule (Power Module) Power Tracking Battery Charger; Package: LGA; Pins: 77; Temperature Range: -40°C to 85°C
Linear
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