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LTC1980EGN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC1980
1
1980f
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
TYPICAL APPLICATIO
U
■
Digital Cameras
■
Handheld Computers
■
Personal Digital Assistants
■
1W to 10W Uninterruptable Power Supplies
Combination Battery
Charger and DC/DC Converter
The LTC
®
1980 integrates PWM power control for charg-
ing a battery and converting the battery voltage to a
regulated output or simultaneously charging the battery
while powering a system load from an unregulated AC wall
adapter. Combining these features into a single IC pro-
duces a smaller area and lower cost solution compared to
presently available multi-IC solutions. The LTC1980 shares
the discrete components for both the battery charger and
the DC/DC converter thus minimizing size and cost relative
to dual controller solutions. Both the battery charger and
DC/DC converter use a current mode flyback topology for
high efficiency and excellent transient response. Optional
Burst Mode operation and power-down mode allow power
density, efficiency and output ripple to be tailored to the
application.
The LTC1980 provides a complete Li-Ion battery charger
with charge termination timer, preset Li-Ion battery volt-
ages, overvoltage and undervoltage protection, and user-
programmable constant-current charging. Automatic bat-
tery recharging, shorted-cell detection, and open-drain
C/10 and wall plug detect outputs are also provided. User
programming allows NiMH and NiCd battery chemistries
to be charged as well.
■
Single Controller IC Includes Battery Charger
Plus DC/DC Converter
■
Wall Adapter Voltage May be Above or Below
Battery Voltage
■
LDO Controller Allows Simultaneous Charging
and Regulating from Wall Adapter Input
■
Standalone Li-Ion Battery Charger Including Charge
Termination, Overvoltage Protection, Shorted-Cell
Detection and Battery Recharge
■
Selectable 4.1V, 4.2V, 8.2V and 8.4V Float Voltages
■
Simple NiMH and NiCd Battery Charger
■
Pin Programmable Regulator Burst Mode
®
Operation
and Shutdown for High Efficiency
■
High Efficiency Current Mode 300kHz PWM
■
Reduced Component Architecture
■
Undervoltage Protection and Soft-Start Ensures
Start-Up with Current Limited Wall Adapter
■
Small 24-Pin SSOP Package
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
Patents Pending.
LTC1980
•
•
Li-Ion
BATTERY
POWER FLOW
CHARGING
BATTERY
OPERATION
SYSTEM
POWER
LDO/
SWITCH
3.3V
UNREGULATED
WALL ADAPTER
INPUT (3V TO 10V)
1.8V
1.5V
1980 TA01
SYSTEM LOAD
DC/DC
CONVERTERS
BAT-FET REG-FET
Li-Ion Charger and DC/DC Converter Using One IC
LOAD CURRENT (mA)
10
EFFICIENCY (%)
90
85
80
75
70
65
60
100 1000
1980 G04
V
BAT
= 3.6V
T
A
= 25°C
FIGURE 5
3.3V Regulator Efficiency vs Load Current
LTC1980
2
1980f
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
V
REG
to GND ............................................. –0.5V to 12V
V
BAT
to GND ............................................. –0.5V to 12V
PROG, I
SENSE
.............................................. –0.5V to 5V
PROGT, REGFB, V
C
, BATT1, BATT2
TIMER, SS ............................................ –0.5V to V
BIAS2
LDOFB, LDODRV .................................... –0.5V to V
REG
WA, V
BIAS1
, REG ....................................... –0.5V to 12V
MODE ................................................... –0.5V to V
BIAS1
V
BIAS2
......................................................... –0.5V to 5V
OVP ............................................................ –0.5V to 5V
PGND to GND .................................... Connect Together
Operating Ambient Temperature Range
(Note 2) ................................................. –40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec)................ 300°C
(Note 1)
ORDER PART
NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
GN PACKAGE
24-LEAD NARROW PLASTIC SSOP
24
23
22
21
20
19
18
17
16
15
14
13
SS
OVP
CAOUT
I
SENSE
GND
V
BIAS2
V
BAT
TIMER
MODE
REG
BGTDR
V
BIAS1
PROG
PROGT
REGFB
V
C
LDOFB
LDODRV
V
REG
WA
BATT1
BATT2
RGTDR
PGND
LTC1980EGN
T
JMAX
= 125°C, θ
JA
= 85°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
BAT
Positive Supply Voltage, V
BAT
2.85 10 V
V
REG
Positive Supply Voltage, V
REG
2.85 10 V
V
FB
Feedback Voltage REGFB Tied to V
C
● 1.194 1.225 1.256 V
V
PROGT
Voltage on PROGT Pin PROGT Tied to V
C
1.194 1.225 1.256 V
I
BURST
Burst Mode Operation Regulator Mode, REGFB = 1.5V 0.75 mA
Supply Current, Quiescent, V
REG
I
HIGH
Supply Current, Quiescent, V
REG
Regulator Mode, REGFB = 0V ● 2 4.3 mA
I
SHDN
Supply Current in Shutdown Mode, V
REG
Mode = 0V 15 µA
V
UVL
Positive-Going Undervoltage Lockout Voltage From Either V
BAT
or V
REG
2.45 2.7 2.85 V
V
UVHYS
Undervoltage Lockout Hysteresis From Either V
BAT
or V
REG
100 mV
I
SS
Soft-Start Ramp Current BATT1 = 0, BATT2 = 0, Charger Mode 10 µA
V
FLOAT0
Output Float Voltage in Constant Voltage Mode BATT1 = 0, BATT2 = 0 ● 4.059 4.1 4.141 V
V
FLOAT1
Output Float Voltage in Constant Voltage Mode BATT1 = 1, BATT2 = 0 ● 4.158 4.2 4.242 V
V
FLOAT2
Output Float Voltage in Constant Voltage Mode BATT1 = 0, BATT2 = 1 (Note 3) ● 8.118 8.2 8.282 V
V
FLOAT3
Output Float Voltage in Constant Voltage Mode BATT1 = 1, BATT2 = 1 (Note 3) ● 8.316 8.4 8.484 V
V
FLOAT4
Output Float Voltage in Constant Voltage Mode BATT1 = Open, BATT2 = Don’t Care ● 1.207 1.225 1.243 V
Measured from OVP Input
V
RCHG0
Recharge Threshold, Delta Voltage with Respect BATT2 = 0, BATT1 = 0 or 1 200 mV
to Float Voltage
V
RCHG1
Recharge Threshold, Delta Voltage with Respect BATT2 = 1, BATT1 = 0 or 1 400 mV
to Float Voltage
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BAT
= 2.4V, V
REG
= 5V, V
BAT
unloaded.
LTC1980
3
1980f
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RCHG2
Recharge Threshold, Delta Voltage with Respect BATT 1 = Open 60 mV
to Float Voltage, Measured at OVP
V
LT0
Charger Shorted Cell Threshold BATT2 = 0 2.55 2.7 2.8 V
V
LT1
Charger Shorted Cell Threshold BATT2 = 1 5.2 5.4 5.65 V
I
BLDO
Input Bias Current, Low Dropout Regulator Measured at LDOFB Pin 1.0 µA
g
mldo
Transconductance, Low Dropout Regulator Measured from LDOFB to LDODRV 350 µmhos
V
OLLDO
Output Low Voltage, Low Dropout Regulator 0.1 V
V
OHLDO
Output High Voltage, Low Dropout Regulator V
REG
– 0.1 V
I
OUTLDO
Low Dropout Regulator Output Current, Source/Sink ±20 µA
A
VOL
Error Amplifier Open-Loop Voltage Gain From REGFB to V
C
60 dB
I
BEA
Error Amplifier Input Bias Current –0.1 0.1 µA
V
OLEA
Error Amplifier Output Low Voltage 0 0.5 V
V
OHEA
Error Amplifier Output High Voltage SS = Open 1.4 2 V
I
OUT
Error Amplifier Output Source Current 0.5 mA
Error Amplifier Output Sink Current –1.2 mA
g
mflt
Float Voltage Error Amplifier Transconductance Measured from OVP to SS, 65 µmhos
Charger Mode, BATT1 = Open
I
BFLT
Float Voltage Error Amplifier Input Current –0.1 0.1 µA
(Measured at OVP Input)
V
OS1
Current Amplifier Offset Voltage –6 6 mV
I
BIS
Input Bias Current, I
SENSE
Input –100 µA
A
VCA
Current Amplifier Voltage Gain Measured from I
SENSE
to 2.3 2.44 2.55 V/V
CAOUT Pin
R
PROG
PROG Pin On Resistance 400 Ω
I
PROG
PROG Pin Leakage Current 100 nA
f
S
Switching Frequency ● 260 300 340 kHz
t
r
, t
f
Driver Output Transition Times C
L
= 15pF 10 ns
t
BREAK
Driver Output Break Times V
BAT
= V
REG
= 10V 100 ns
f
TIMER
Timer Frequency C = 1000pF 4.5 kHz
I
TIMER1
TIMER Pin Source Current –4 µA
I
TIMER2
TIMER Pin Sink Current 4 µA
R
REG
REG On Resistance 68 Ω
I
REGPD
REG Pull-Down Current 2 5 9 µA
I
REGLK
REG Leakage Current 60 nA
V
VTHREG
REG Logic Threshold 0.3 1.3 V
V
IL1
Digital Input Low Voltage, V
REG
= 5V 1.185 1.221 1.247 V
Negative-Going, Wall Adapter (WA)
V
IH1
Digital Input High Voltage, V
REG
= 5V 1.195 1.226 1.257 V
Positive-Going, Wall Adapter (WA)
V
IL2
Digital Input Low Voltage, BATT1 100 mV
V
IH2
Digital Input High Voltage, BATT1 V
BIAS2
V
–100
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BAT
= 2.4V, V
REG
= 5V, V
BAT
unloaded.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC1980EGN#PBF

Mfr. #:
Buy LTC1980EGN#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Combination Bat Chr & DC/DC Conv
Lifecycle:
New from this manufacturer.
Delivery:
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