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LTC3552 PDF даташит

Спецификация LTC3552 изготовлена ​​​​«Linear Technology» и имеет функцию, называемую «Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter».

Детали детали

Номер произв LTC3552
Описание Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter
Производители Linear Technology
логотип Linear Technology логотип 

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LTC3552 Даташит, Описание, Даташиты
LTC3552
FEATURESwww.datasheet4u.com
Standalone Linear Li-Ion
Battery Charger and Dual
Synchronous Buck Converter
DESCRIPTIO
Programmable Charge Current Up to 950mA
Complete Linear Charger and Dual DC/DC
Regulator
Buck Converter Output Voltage from 0.6V to 5V
No MOSFET, Sense Resistor or Blocking Diode
Required
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
Charges Directly from a USB Port
Programmable Charge Current Termination
Preset 4.2V Charge Voltage with ±1% Accuracy
Charge Current Monitor Output for Gas Gauging*
Automatic Recharge
Charge Status Output
“Power Present” Output
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Low Quiescent Current Buck Converter (40µA)
Current Mode Operation, Constant Frequency (2.25MHz)
Low Profile (5mm × 3mm × 0.75mm) DFN Package
U
APPLICATIO S
Cellular Telephones, PDAs, MP3 Players
Bluetooth Applications
The LTC®3552 is a complete constant-current/constant-
voltage linear charger with a dual DC/DC converter for
single cell lithium-ion batteries. Its DFN package and low
external component count make the LTC3552 ideally suited
for portable applications. Furthermore, the LTC3552 is
designed to work within USB power specifications.
No external sense resistor or external blocking diode is
required due to the internal MOSFET architecture. The
charge voltage is fixed at 4.2V and the charge current is
programmed with a resistor. The charge cycle terminates
when the charge current drops below the programmed
termination threshold after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is
removed, the LTC3552 enters a low current state dropping
the battery drain current to less than 2µA. Thermal regula-
tion maximizes charge rate without risk of overheating.
The synchronous step-down switching regulators gen-
erate adjustable output voltages from 5V down to 0.6V.
The switching frequency is set at 2.25MHz, allowing the
use of small surface mount inductors and capacitors.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. patents, including 6522118, 6700364, 5481178, 6580258, 6304066,
6127815, 6498466, 6611131.
TYPICAL APPLICATIO
Single Cell Li-Ion Battery Charger with
C/5 Termination and Dual DC/DC Converter
VIN
4.5V TO
6.5V
VOUT2
2.5V/
400mA
1µF
COUT2
4.7µF
CER
619
1.24k
4.7µH
LTC3552
VIN RUN1
ITERM
RUN2
PROG
BAT
CHRG
PWR
EN
SW2
VCC
POR
MODE/SYNC
SW1
CFF2
68pF
R4
887k
R3
280k
VFB2
GND VFB1
800mA
+
10µF
2.2µH
R2
604k
R1
301k
CFF1
33pF
4.2V
1-CELL
Li-Ion
BATTERY
VOUT1
1.8V/
800mA
COUT1
10µF
CER
3552 TA01
Efficiency Curve/
Power Loss of Regulators
100
1000
95
90 EFFICIENCY
100
85
80
POWER LOSS
75
10
70 1
65
60
1
0.1
10 100 1000
LOAD CURRENT (mA)
VCC = 3.3V, VOUT = 1.8V
Burst Mode OPERATION
3552 TA01b
REGULATOR 1, NO LOAD ON REGULATOR 2
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LTC3552 Даташит, Описание, Даташиты
LTC3552
ABSOLUTE AXI U RATI GS
(Note 1)
Charger Input Supply (VIN) ........................ –0.3V to 10V
PROG, ITERM
www.datasheet4u.com
..................................
–0.3V
to
VIN
+
0.3V
BAT .............................................................. –0.3V to 7V
CHRG, PWR, EN......................................... –0.3V to 10V
BAT Short-Circuit Duration............................Continuous
BAT Pin Current ..........................................................1A
PROG Pin Current ....................................................1mA
Converter Input Supply (VCC)....................... –0.3V to 6V
VFB1, VFB2, RUN1, RUN2...................–0.3V to VCC +0.3V
MODE/SYNC ....................................–0.3V to VCC + 0.3V
SW1, SW2 .......................................–0.3V to VCC + 0.3V
POR ............................................................. –0.3V to 6V
Ambient Operating Temperature
Range (Note 2) .................................... –40°C to 85°C
Maximum Junction Temperature (Note 8) ............ 125°C
Storage Temperature Range................... –65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ITERM 1
BAT 2
CHRG 3
MODE/SYNC 4
SW2 5
POR 6
RUN2 7
VFB2 8
16 EN
15 PWR
14 VIN
13 PROG
17
12 SW1
11 VCC
10 RUN1
9 VFB1
DHC PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C/W (Note 3)
EXPOSED PAD IS GROUND (PIN 17)
MUST BE SOLDERED TO PCB
ORDER PART NUMBER DHC PART MARKING
LTC3552EDHC
3552
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VCC = 3.6V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Battery Charger
VIN
IIN
VFLOAT
IBAT
ITRIKL
VTRIKL
VTRHYS
VUV
VUVHYS
Input Supply Voltage
4.25
8
Input Supply Current
Charge Mode (Note 4)
Standby Mode
Shutdown Mode
RPROG = 10k
Charge Terminated
EN = 5V, VIN < VBAT or VIN < VUV
0.4 1
200 500
25 50
Regulated Output (Float) Voltage
0°C ≤ TA ≤ 85°C, 4.3V < VIN < 8V
4.158 4.2 4.242
BAT Pin Current
RPROG = 10k, Current Mode
92 100 105
RPROG = 2k, Current Mode
465 500 535
Standby Mode, VBAT = 4.2V
–2.5 –6
Shutdown Mode (EN = 5V, VIN < VBAT or
±1 ±2
VIN < VUV)
Sleep Mode, VIN = 0V
±1 ±2
Trickle Charge Current
VBAT < VTRIKL, RPROG = 2k
30 45 60
Trickle Charge Threshold Voltage
RPROG = 10k, VBAT Rising
2.8 2.9
3
Trickle Charge Hysterisis Voltage
RPROG = 10k
80
VIN Undervoltage Lockout Voltage
From VIN Low to High
3.7
3.8 3.92
VIN Undervoltage Lockout Hysteresis
150 200 300
V
mA
µA
µA
V
mA
mA
µA
µA
µA
mA
V
mV
V
mV
3552f
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LTC3552 Даташит, Описание, Даташиты
LTC3552
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VCC = 3.6V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
wwwV.dEaNt(aILs)heet4u.com EN Pin Input Low Voltage
VEN(IH)
EN Pin Input High Voltage
REN EN Pin Pull-Down Resistor
VASD VIN – VBAT Lockout Threshold Voltage
ITERM
Charge Termination Current Threshold
VPROG
VCHRG
VPWR
ΔVRECHRG
TLIM
PROG Pin Voltage
CHRG Pin Output Low Voltage
PWR Pin Output Low Voltage
Recharge Battery Threshold Voltage
Junction Temperature in Constant-
Temperature Mode
VIN from Low to High
VIN from High to Low
RTERM = 1k
RTERM = 5k
RPROG = 10k, Current Mode
ICHRG = 5mA
IPWR = 5mA
VFLOAT – VRECHRG, 0°C < TA < 85°C
0.4
0.7
0.7 1
1.2
2
5
70 100 140
5 30 50
90
100 110
17.5 20 22.5
0.93 1 1.07
0.35 0.6
0.35 0.6
60 100 140
120
RON-CHRG
tSS-CHRG
tRECHRG
tTERM
Charger’s Power FET On-Resistance
(Between VIN and BAT)
Charger Soft-Start Time
Recharge Comparator Filter Time
Termination Comparator Filter Time
IBAT = 0 to IBAT = 1000V/RPROG
VBAT High to Low
IBAT Drops Below Charge Termination
Threshold
600
100
0.75 2
0.4 1
4.5
2.5
Switching Regulator
VCC
IFB
VFB
ΔVLINE_REG
ΔVLOAD_REG
IS
fOSC
fSYNC
ILIM
RDS(ON)
Operating Voltage Range for Regulator
2.5
5.5
Feedback Pin Input Current
30
Feedback Voltage (Note 5)
Reference Voltage Line Regulation
Output Voltage Load Regulation
0°C ≤ TA ≤ 85°C
–40°C ≤ TA ≤ 85°C
VCC = 2.5V to 5.5V (Note 5)
(Note 5)
0.588 0.6 0.612
0.585 0.6 0.612
0.3 0.5
0.5
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
Synchronization Frequency
VFB1 = VFB2 = 0.5V
VFB1 = VFB2 = 0.63V, MODE/SYNC = 3.6V
RUN = 0V, VCC = 5.5V, MODE/SYNC = 0V
700 950
40 60
0.1 1
VFB = 0.6V
1.8 2.25 2.7
2.25
Peak Switch Current Limit Regulator 1
Peak Switch Current Limit Regulator 2
Top Switch On-Resistance
Bottom Switch On-Resistance
VCC = 3V, VFB = 0.5V, Duty Cycle < 35%
VCC = 3V, VFB = 0.5V, Duty Cycle < 35%
(Note 6)
(Note 6)
0.95 1.2
0.6 0.7
1.6
0.9
0.35 0.45
0.30 0.45
ISW(LKG)
POR
Switch Leakage Current
Power-On Reset Threshold
Power-On Reset On-Resistance
VCC = 5V, VRUN = 0V, VFB = 0V
VFB Ramping Down, MODE/SYNC = 0V
0.01 1
–8.5
100 200
Power-On Reset Delay
262,144
VRUN
IRUN
RUN Threshold Voltage
RUN Leakage Current
0.3 1 1.5
0.01 1
UNITS
V
V
MΩ
mV
mV
mA
mA
V
V
V
mV
°C
mΩ
µs
ms
ms
V
nA
V
V
%/V
%
µA
µA
µA
MHz
MHz
A
A
Ω
Ω
µA
%
Ω
Cycles
V
µA
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