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LT1505 데이터시트 PDF




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부품번호 LT1505 기능
기능 Constant-Current/Voltage High Efficiency Battery Charger
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LT1505 데이터시트, 핀배열, 회로
LT1505
Constant-Current/Voltage
High Efficiency Battery Charger
FEATURES
s Simple Charging of Li-Ion, NiMH and NiCd Batteries
s Very High Efficiency: Up to 97%
s Precision 0.5% Charging Voltage Accuracy
s Preset Battery Voltages: 12.3V, 12.6V,
16.4V and 16.8V
s 5% Charging Current Accuracy
s Charging Current Programmed by Resistor or DAC
s 0.5V Dropout Voltage, Duty Cycle > 99.5%
s AC Adapter Current Limit* Maximizes Charging Rate
s Flag Indicates Li-Ion Charge Completion
s Auto Shutdown with Adapter Removal
s Only 10µA Battery Drain When Idle
s Synchronizable Up to 280kHz
U
APPLICATIO S
s Notebook Computers
s Portable Instruments
s Chargers for Li-Ion, NiMH, NiCd and Lead Acid
Rechargeable Batteries
DESCRIPTIO
The LT®1505 PWM battery charger controller fast charges
multiple battery chemistries including lithium-ion (Li-Ion),
nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd)
using constant-current or constant-voltage control. Maxi-
mum current can be easily programmed by resistors or a
DAC. The constant-voltage output can be selected for 3 or 4
series Li-Ion cells with 0.5% accuracy.
A third control loop limits the current drawn from the AC
adapter during charging*. This allows simultaneous opera-
tion of the equipment and fast battery charging without over-
loading the AC adapter.
The LT1505 can charge batteries ranging from 2.5V to 20V
with dropout voltage as low as 0.5V. Synchronous
N-channel FETs switching at 200kHz give high efficiency
and allow small inductor size. A diode is not required in
series with the battery because the charger automatically
enters a 10µA sleep mode when the wall adapter is un-
plugged. A logic output indicates Li-Ion full charge when
current drops to 20% of the programmed value.
The LT1505 is available in a 28-pin SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*US Patent No. 5,723,970
TYPICAL APPLICATION
VIN
(FROM
ADAPTER)
R5
4k
R6
4k
M3
Si4435
DBODY*
TO
SYSTEM POWER
RS4
0.025
R7
500
C1
1µF
CIN
47µF
35V
100k
VCC
CLN
CLP
INFET
UV
SYNC
SHDN
BOOST BOOSTC
GBIAS
TGATE
SW
BGATE
LT1505
VC
PROG
3 CELL
*BODY DIODE
POLARITY MUST
BE AS SHOWN
C6
0.1µF
R1
1k
C7
0.68µF
FLAG
CAP
COMP1
BAT2 BAT
VFB
4.2V
4.1V
AGND
PGND
SENSE SPIN
C4
0.1µF
D3
MMSD4148T1
C3 D2
2.2µF MMSD4148T1
5
M1
Si4412
M2
Si4412
D4
MBRS140
C2
0.68µF
L1
15µH
RS1
0.025
COUT
22µF
25V
×2
300
CPROG
1µF
RPROG
4.93k
1%
RX4
3k
0.33µF
NOTE: DBODY IS THE BODY DIODE OF M3
CIN: SANYO OS-CON
L1: SUMIDA CDRH127-150
(CAN BE FROM 10µH TO 30µH)
RS2
200
1%
RS3
200
1%
VBAT
12.6V
BATTERY
1505 F01
Figure 1. Low Dropout 4A Lithium-Ion Battery Charger
1




LT1505 pdf, 반도체, 판매, 대치품
LT1505
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 18V, VBAT = 12.6V, VCLN = VCC (LT1505), no load on any
outputs unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Voltage Amplifier VA
Transconductance (Note 3)
Output Current from 50µA to 500µA
0.21 0.6
1.0
Output Source Current
VFB Input Bias Current
Current Limit Amplifier CL1
VFB = VPROG = VREF + 10mV
At 0.5mA VA Output Current, TA = 25°C
At 0.5mA VA Output Current, TA = 70°C
(3 CELL, 4.1V, 4.2V Are Not Connected, VBAT2 = 0V)
1.1
±3 ±10
– 10 25
Turn-On Threshold
0.5mA Output Current
87 92 97
Transconductance
Output Current from 50µA to 500µA
0.5 1
3
CLP Input Current
0.5mA Output Current
13
CLN Input Current
0.5mA Output Current
0.8 2
Input P-Channel FET Driver (INFET)
INFET “On” Clamping Voltage (VCC – VINFET)
INFET “On” Driver Current
INFET “Off” Clamping Voltage (VCC – VINFET)
INFET “Off” Drive Current
Charging Completion Flag (Comparator E6)
VCC 11V
VINFET = VCC – 6V
VCC Not Connected, IINFET < – 2µA
VCC Not Connected, (VCC – VINFET) 2V
q 6.5
7.8
9
q8
20
1.4
– 2.5
Charging Completion Threshold (Note 6)
Threshold On CAP Pin
Measured at VRS1, VCAP = 2V (Note 7)
Low to High Threshold
High to Low Threshold
14 20 28
q 3.3 4.2
q 0.6
VCAP at Shutdown
FLAG (Open Collector) Output Low
FLAG Pin Leakage Current
Gate Drivers (TGATE, BGATE)
VSHDN = Low (Shutdown)
VCAP = 4V, IFLAG < 1mA
VCAP = 0.6V
q 0.13 0.3
q 0.3
q3
VGBIAS
VTGATE High (VTGATE – VSW)
VBGATE High
VTGATE Low (VTGATE – VSW)
VBGATE Low
Peak Gate Drive Current
11V < VCC < 24V, IGBIAS 15mA
VSHDN = Low (Shutdown)
ITGATE 20mA, VBOOST = VGBIAS – 0.5V
IBGATE 20mA
ITGATE 50mA
IBGATE 50mA
10nF Load
q 8.4 8.9 9.3
q 13
q 5.6
6.6
q 6.2
7.2
q 0.8
q 0.8
1
Gate Drive Rise and Fall Time
1nF Load
25
VTGATE, VBGATE at Shutdown
VSHDN = Low (Shutdown)
ITGATE = IBGATE = 10µA
q1
UNITS
mho
mA
nA
nA
mV
mho
µA
mA
V
mA
V
mA
mV
V
V
V
V
µA
V
V
V
V
V
V
A
ns
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Tested with Test Circuit 1.
Note 3: Tested with Test Circuit 2.
Note 4: When VCC and battery voltage differential is low, high duty factor
is required. The LT1505 achieves a duty factor greater than 99% by
skipping cycles. Only when VBOOST drops below the comparator A2
threshold will TGATE be turned off. See Applications Information.
Note 5: When the system starts, C2 (boost cap) has to be charged up to
drive TGATE and to start the system. The LT1505 will keep TGATE off and
turn BGATE on for 0.2µs at 200kHz to charge up C2. Comparator A2
senses VBOOST and switches to the normal PWM mode when VBOOST is
above the threshold.
Note 6: See “Lithium-Ion Charging Completion” in the Applications
Information Section.
Note 7: Tested with Test Circuit 3.
Note 8: ISPIN keeps switching on to keep VBAT regulated when battery is
not present to avoid high surge current from COUT when battery is
inserted.
Note 9: Above undervoltage threshold switching is enabled.
Note 10: Do not connect VCC directly to VIN (see Figure 1). This connection
will cause the internal diode between VBAT and VCC to be forward-biased
and may cause high current to flow from VIN. When the adapter is
removed, VCC will be held up by the body diode of M1.
4

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LT1505 전자부품, 판매, 대치품
LT1505
PIN FUNCTIONS
the noninverting input to the amplifier, VA in the Block
Diagram, that controls the charging current when the
device operates in constant voltage mode. The amplifier
VA controls the charging current to maintain the voltage
on the VFB pin at the reference voltage (2.465V). Input bias
current for VA is approximately 3nA. The LT1505 incorpo-
rates a resistor divider that can be used to select the
correct voltage for either three or four 4.1V or 4.2V
lithium-ion cells. For three cells the 3CELL pin is shorted
to the VFB pin. For four cells the 3CELL pin is not con-
nected. For 4.1V cells the 4.1V pin is connected to the VFB
pin and the 4.2V pin is not connected. For 4.2V cells the
4.2V pin is connected to VFB and the 4.1V pin is not
connected. See the table below.
PRESET BATTERY VOLTAGE
12.3V (3 × 4.1V Cell)
16.4V (4 × 4.1V Cell)
12.6V (3 × 4.2V Cell)
16.8V (4 × 4.2V Cell)
PIN SELECTION
4.1V, VFB, 3CELL Short Together
4.1V, VFB, Short Together, 3CELL Floats
4.2V, VFB, 3CELL Short Together
4.2V, VFB, Short Together, 3CELL Floats
For battery voltages other than the preset values, an
external resistor divider can be used. If an external divider
is used then the 4.1V, 4.2V and 3CELL pins should not be
connected and BAT2 pin should be grounded. To maintain
the tight voltage tolerance, the external resistors should
have better than 0.25% tolerance. Note that the VFB pin will
float high and inhibit switching if it is left open.
VC (Pin 18): This is the control signal of the inner loop of
the current mode PWM. Switching starts at 0.9V, higher
VC corresponds to higher charging current in normal
operation and reaches 1.1V at full charging current. A
capacitor of at least 0.33µF to GND filters out noise and
controls the rate of soft start. Pulling this pin low will stop
switching. Typical output current is 60µA.
PROG (Pin 19): This pin is for programming the charge
current and for system loop compensation. During normal
operation, VPROG stays at 2.465V. If it is shorted to GND or
more than 1mA is drawn out of the pin, switching will stop.
When a microprocessor controlled DAC is used to pro-
gram charging current, it must be capable of sinking
current at a compliance up to 2.465V.
BAT2 (Pin 20): This pin is used to connect the battery to
the internal preset voltage setting resistor. An internal
switch disconnects the internal divider from the battery
when the device is in shutdown or when power is discon-
nected. This disconnect function eliminates the current
drain due to the resistor divider. This pin should be
connected to the positive node of the battery if the internal
preset divider is used. This pin should be grounded if an
external divider is used. Maximum input voltage on this
pin is 20V.
SENSE (Pin 21): This pin is the noninverting input to the
current amplifier CA1 in the Block Diagram. Typical bias
current is – 50µA.
SPIN (Pin 22): This pin is for the internal amplifier CA1
bias. It must be connected as shown in the application
circuit.
BAT (Pin 23): Current Amplifier CA1 Inverting Input.
Typical bias current is – 50µA.
VCC (Pin 24): Input Supply. For good bypass, a low ESR
capacitor of 10µF or higher is required. Keep the lead
length to a minimum. VCC should be between 11V and 24V.
Do not force VCC below VBAT by more than 1V with the
battery present.
BOOSTC (Pin 25): This pin is used to bootstrap and supply
the current sense amplifier CA1 for very low dropout
condition. VCC can be as low as only 0.4V above the battery
voltage. A diode and a capacitor are needed to get the
voltage from VBOOST. If low dropout is not needed and VCC
is always 3V or higher than VBAT, this pin can be left
floating or tied to VCC. Do not force this pin to a voltage
lower than VCC. Typical input current is 1mA.
GBIAS (Pin 26): This is the output of the internal 8.6V
regulator to power the drivers and control circuits. This pin
must be bypassed to a ground plane with a minimum of
2.2µF ceramic capacitor. Switching will stop when VGBIAS
drops below 7V.
BGATE (Pin 27): Low Side Power MOSFET Drive.
PGND (Pin 28): MOSFET Driver Power Ground. A solid
system ground plane is very important. See the LT1505
Demo Manual for further information.
7

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