LTC4020_15 Datasheet, PDF (41/42 Pages) Linear Technology – 55V Buck-Boost Multi-Chemistry Battery Charger

LTC4020
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
2 to 5
3
3
Changed C/10 Detection Enable Units
4
Modified C/10 Detection Hysteresis spec
4
Changed Conditions for Gate Clamp Voltage
4
Changed Conditions for BGATE tests
5
Changed Conditions for Pin Current (Disabled) spec
5
Changed cathode to anode for BST1
8
Changed anode to cathode for BST1
8
Modified equations for T_EOC and T_PRE and associated TIMER text
9
Modified equations for R_FB1/R_FB2 and R_MIN1/R_MIN2
10
Changed cathode to anode for BST2
12
Changed anode to cathode for BST2
12
Modified Error Amplified Transconductance
14
Modified step-up and step-down equations in Switch FET section
24
Modified C_TIMER equation and associated text
30
Modified Typical Applications circuit
38
Modified Typical Application circuit to 12-cell
42
B 09/14 Added “(Application Circuit on Page 37)” to efficiency curve title
1
Added Ω unit to R_FBG specification
5
Changed “INTV_CC Short Circuit Current Limit vs Temperature” curve y-axis units to ‘mA’
6
Added text to the end of the NTC (Pin 16) section
10
Corrected formula: (V_OUTMAX/2.75) - 1
12
Changed BST1 on lower-right of block diagram to BST2; Insert “(V_SENS)” below ‘2mV’ near VC pin
14
Added 2V zener diode symbol from NTC pin (cathode) to ground (anode)
15
Added “average” to first line; change “Charge” to “Average Inductor” in Figure 6 title
23
Changed “inductor” to “charge”
28
Added ground symbol to bottom of IC symbol (backside connection)
37
Flipped PMOS symbol vertically (Si7461DP); add ground symbol to bottom of IC symbol (backside connection)
38
Added ground symbol to bottom of IC symbol (backside connection)
39
Moved connection of BZX84C6V2L anode from BG2 to SW2 (diode between BST2 and SW2); add ground symbol to
bottom of IC symbol (backside connection)
42
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 interconneFctoiornmofoirtseciinrcfuoirtsmaastdioesncrwibwedwh.leirneeinawr.cilol nmot/LinTfrCin4g0e2o0n existing patent rights.
4020fb
41