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LTC4121 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC4121
Description  40V 400mA Synchronous Step-Down Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4121 Datasheet(HTML) 5 Page - Linear Technology

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LTC4121/LTC4121-4.2
5
4121fa
For more information www.linear.com/LTC4121
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RUN
VEN
Enable Threshold
VRUN Rising
l
2.35
2.45
2.55
V
Hysteresis
VRUN Falling
200
mV
Run Pin Input Current
VRUN = 40V
0.01
0.1
µA
VSD
Shutdown Threshold
VRUN Falling
l
0.4
1.2
V
Hysteresis
220
mV
FREQ
FREQ Pin Input Low
l
0.4
V
FREQ Pin Input High
l
3.6
V
FREQ Pin Input Current
0 < VFREQ < VINTVCC
±1
µA
MPPT
IMPPT
MPPT Pin Leakage Current
VMPPT = 4.2V
l
15
1000
nA
TMP
MPPT Sample Period
Period Between Charger Disabled Events
28
s
PWMP
MPPT Sample Pulse Width
Charger Disabled Pulse Width
36
ms
KF
Internal Divider Gain
Internal DAC Voltage as a Ratio to VIN
0.098
0.1
0.102
V/V
VMP(OS)
MPPT Error Amp Gain Offset
VMPPT – VDAC, IBAT = 50%• ICHG
10
–45
–100
mV
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = VRUN = 15V, VCHGSNS = VBAT = 4V, RPROG = 3.01k,
VFB = 2.29V (LTC4121), VBATSNS = 4V (LTC4121-4.2). Current into a pin is positive out of a pin is negative. (Note 2)
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.
Note 2: The LTC4121 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC4121E is guaranteed to meet performance specifications
for junction temperatures from 0°C to 85°C. Specifications over the
–40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC4121I is guaranteed over the full –40°C to 125°C operating
junction temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance, and other environmental factors.
Note 3: If a battery voltage greater than 11V can be hot plugged to the
LTC4121 a reverse blocking diode is required in series with the BAT pin to
prevent large inrush current into the low impedance BAT pin.
Note 4: Standby mode occurs when the LTC4121/LTC4121-4.2 stops
switching due to an NTC fault, MPPT pause, or when the charge current
has dropped low enough to enter Burst Mode operation. Disabled mode
occurs when VRUN is between VSD and VEN. Shutdown mode occurs
when VRUN is below VSD or when the differential undervoltage lockout
is engaged. Sleep mode occurs after a timeout while the battery voltage
remains above the VRCHG or VRCHG_42 threshold.
Note 5: The internal supply INTVCC should only be used for the NTC
divider, it should not be used for any other loads
Note 6: For the LTC4121, the FB pin is measured with a resistance of 588k
in series with the pin.
Note 7: hC/10 is expressed as a fraction of measured full charge current as
measured at the PROG pin voltage when the CHRG pin de-asserts.
Note 8: In an application circuit with an inductor connected from SW to
CHGSNS, the total battery leakage current when disabled is the sum of
IBATSNS and ISW (LTC4121-4.2) or IBAT and IFBG_LEAK and ISW (LTC4121).
Note 9: When no supply is present at IN, the SW powers IN through the
body diode of the top side switch. This may cause additional SW pin
current depending on the load present at IN.
Note 10: Guaranteed by design and/or correlation to static test.


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