LTC1759CG Linear Technology, LTC1759CG Datasheet - Page 5

• Manufacturer Part Number: LTC1759CG
• Description: IC SMART BATTERY CHARGER 36SSOP
• Manufacturer: Linear Technology

Specifications of LTC1759CG

• Function: Charge Management
• Battery Type: Smart Batteries
• Voltage - Supply: 11 V ~ 24 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ELECTRICAL CHARACTERISTICS
The
T
PARAMETER
Charger Timing
V
TGATE, BGATE Peak Drive Current
Regulator Switching Frequency
Synchronization Frequency
Maximum Duty Cycle in Start-Up Mode (Note 9)
t
Cold or Underrange Battery
SMBus Timing (refer to System Management Bus Specification, Revision 1.0, section 2.1 for timing diagrams) (Note 12)
SCL Serial Clock High Period (t
SCL Serial Clock Low Period (t
SDA/SCL Rise Time (t
SDA/SCL Fall Time (t
SMBus Accelerator Boosted Pull-Up Current
Start Condition Setup Time (t
Start Condition Hold Time (t
SDA to SCL Rising-Edge Setup Time (t
SDA to SCL Falling-Edge Hold Time,
Slave Clocking in Data (t
t
ChargingCurrent() and ChargingVoltage()
Commands (Note 10)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: This limit is greater than the absolute maximum for the charger.
Therefore, there is no effective limitation on voltage when this option is
selected. If the charger is requested to charge with a higher voltage than
the nominal limit, the VOLTAGE_OR bit will be set.
Note 3: Total system accuracy from SMBus request to output voltage or
output current.
Note 4: Test Circuit #1.
Note 5: Voltage accuracy is calculated using measured reference voltage,
obtained from V
ratio.
Note 6: When supply and battery voltage differential is low, high oscillator
duty cycle is required. The LTC1759 has a unique design to achieve duty
cycle greater than 99% by skipping cycles. Only when V
the comparator threshold, will TGATE be turned off. See Applications
Information section.
TIMEOUT
TIMEOUT
A
TGATE
= 25 C. V
, V
denotes specifications which apply over the full operating temperature range (T
for Wake-Up Charging a
Between Receiving Valid
BGATE
CC
Rise/Fall Time
SET
= DCIN = 18V, V
pin using Test Circuit #2, and VDAC resistor divider
f
)
r
)
HD:DAT
HD:STA
SU:STA
LOW
)
HIGH
)
)
)
)
BAT1, 2
SU:DAT
= 12.6V, V
)
CONDITIONS
1nF Load
10nF Load
I
I
C
V
PULLUP
PULLUP
LOAD
DD
DD
BOOST
= 3V
= 3.3V unless otherwise specified.
= 150pF
= 350 A, C
= 350 A, C
drops below
LOAD
LOAD
= 150pF
= 150pF
Note 7: Power failure bit is set when the battery voltage is above 89% of
the power adapter voltage (V
Note 8: The charger provides wake-up current when a battery is inserted
into the connector, prior to the battery requesting charging current and
voltage. See Smart Battery Charger Specification (Revision 1.0), section
6.1.3 and 6.1.8.
Note 9: In system start-up, C6 (boost capacitor) has no charge stored in it.
The LTC1759 will keep TGATE off, and turn BGATE on for 0.2 s, thus
charging C6. A comparator senses V
PWM mode when V
Note 10: Refer to Smart Battery Charge Specification (Revision 1.0),
section 6.1.2.
Note 11: Maximum total external capacitance on RNR and THERM pins
is 75pF.
Note 12: SMBus operation guaranteed by design from –40 C to 85 C.
J
BOOST
= 0 C to 100 C), otherwise specifications are
is above its threshold.
DCIN
).
MIN
170
240
140
250
300
140
4.7
4.7
4.0
85
30
BOOST
4
1
and switches to the normal
TYP
200
175
175
2.5
25
90
1
LTC1759
1000
MAX
230
280
210
300
210
UNITS
5
kHz
kHz
sec
mA
sec
ns
ns
ns
ns
ns
%
A
s
s
s
s