LTC4020_15 Datasheet, PDF (2/42 Pages) Linear Technology – 55V Buck-Boost Multi-Chemistry Battery Charger

LTC4020
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PV_IN, SENSVIN.............................................. –0.3 to 60V
BST1, BST2................................................... –0.3 to 66V
SW1, SW2.........................................................–2 to 60V
SENSVIN – PV_IN............................................ –0.3 to 60V
BST1 – SW1, BST2 – SW2.............................. –0.3 to 6V
SENSVIN – SENSTOP, SENSBOT –
SENSGND.....................................................–0.3 to 0.3V
CSP, CSN...................................................... –0.3 to 60V
CSP – CSN....................................................–0.3 to 0.3V
STAT1, STAT2, SHDN.................................... –0.3 to 60V
V_FBMAX, V_INREG, V_FB, V_FBMIN, BAT, FBG........ –0.3 to 60V
MODE.............................................................. –0.3 to 6V
Status Pin Currents:
STAT1, STAT2.......................................................5mA
Operating Junction Temperature
Range (Note 2)........................................ –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
TG1 1
BST1 2
SGND 3
SENSGND 4
SENSBOT 5
SENSTOP 6
SENSVIN 7
RT 8
SHDN 9
V_{IN_REG} 10
MODE 11
STAT1 12
38 37 36 35 34 33 32
39
SGND
13 14 15 16 17 18 19
31 TG2
30 BST2
29 SGND
28 VC
27 ITH
26 V_FBMAX
25 I_LIMIT
24 CSOUT
23 CSP
22 CSN
21 BGATE
20 BAT
UHF PACKAGE
38-LEAD PLASTIC QFN (5mm × 7mm)
T_JMAX = 125°C, θ_JA = 34°C/W, θ_JC = 2°C/W
EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4020EUHF#PBF
LTC4020EUHF#TRPBF 4020
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 125°C
LTC4020IUHF#PBF
LTC4020IUHF#TRPBF 4020
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C (Note 2). PV_IN = SENSVIN = CSP = CSN = BAT = 20V, SHDN = 2V,
C_{(TG1, BG1, TG2, BG2)} = 1000pF, V_RNG/SS = 2V.
SYMBOL PARAMETER
Buck-Boost Switching Converter
V_IN
UVLO
Operating Voltage Range
V_IN Supply UVLO (Rising)
V_IN Supply UVLO Hysteresis
SENSVIN Supply UVLO (Rising)
SENSVIN UVLO Hysteresis
BST Supplies UVLO (Rising)
BST Supplies UVLO Hysteresis
2
CONDITIONS
PV_IN; SENSVIN
DC/DC Functions Enabled
V_IN Falling
INTV_CC Enabled
SENSVIN Falling
BST1 – SW1; BST2 – SW2;
SW1, SW2 = 0V
For more information www.linear.com/LTC4020
MIN TYP MAX UNITS
l 4.5
55
V
l 3.6
4.0
4.4
V
0.4
V
3.4
V
0.3
V
l 3.0
3.3
3.8
V
0.4
V
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