Datasheet
LTC4020
41
4020fd
For more information www.linear.com/LTC4020
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
revision hisTory
REV DATE DESCRIPTION PAGE NUMBER
A 01/14 Changed V
IN
to PV
IN
Modified I
SENSTOP
Operating Current spec
Modified Error Amp Transconductance spec
Changed C/10 Detection Enable Units
Modified C/10 Detection Hysteresis spec
Changed Conditions for Gate Clamp Voltage
Changed Conditions for BGATE tests
Changed Conditions for Pin Current (Disabled) spec
Changed cathode to anode for BST1
Changed anode to cathode for BST1
Modified equations for T
EOC
and T
PRE
and associated TIMER text
Modified equations for R
FB1
/R
FB2
and R
MIN1
/R
MIN2
Changed cathode to anode for BST2
Changed anode to cathode for BST2
Modified Error Amplified Transconductance
Modified step-up and step-down equations in Switch FET section
Modified C
TIMER
equation and associated text
Modified Typical Applications circuit
Modified Typical Application circuit to 12-cell
2 to 5
3
3
4
4
4
5
5
8
8
9
10
12
12
14
24
30
38
42
B 09/14 Added “(Application Circuit on Page 37)” to efficiency curve title
Added Ω unit to R
FBG
specification
Changed “INTV
CC
Short Circuit Current Limit vs Temperature” curve y-axis units to ‘mA’
Added text to the end of the NTC (Pin 16) section
Corrected formula: (V
OUTMAX
/2.75) - 1
Changed BST1 on lower-right of block diagram to BST2; Insert “(V
SENS
)” below ‘2mV’ near VC pin
Added 2V Zener diode symbol from NTC pin (cathode) to ground (anode)
Added “average” to first line; change “Charge” to “Average Inductor” in Figure 6 title
Changed “inductor” to “charge”
Added ground symbol to bottom of IC symbol (backside connection)
Flipped PMOS symbol vertically (Si7461DP); add ground symbol to bottom of IC symbol (backside connection)
Added ground symbol to bottom of IC symbol (backside connection)
Moved connection of BZX84C6V2L anode from BG2 to SW2 (diode between BST2 and SW2); add ground symbol to
bottom of IC symbol (backside connection)
1
5
6
10
12
14
15
23
28
37
38
39
42
C 09/15 Added pin names to Typical Application IC drawing
Added text to end of SENSBOT (5) pin description section
Changed text in RNG/SS section: “Inductor” to “Charge”
Changed I
LIMIT
text, “...pin, so maximum charge current..." to “...pin, so maximum inductor current..."
Changed Operation section to “a 0.47µF capacitor on the TIMER pin is typically used, which generates a 6.8 hour
absorption stage safety timeout”
Changed “C
SENSBOT,SENSGND
” to “C
SENSB
”
Changed “...BGATE pin to ground” to “...BGATE pit to CSN”
Changed “CSN” to “CSN”. Replaced “R
CS
with R
CSZ
” in the text and in Figure 19. Replaced “R
SENSE
” with R
CS
in
Figure 19
Replaced “R
SENSE
” with “R
CS
” in schematic
1
8
9
12
20
22
28
32
37-39, 42
D 04/16 Modified bulk capacitance equation 24
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