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LTC4020 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC4020
Description  55V Buck-Boost Multi-Chemistry Battery Charger
PDF  42 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4020 Datasheet(HTML) 3 Page - Linear Technology

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LTC4020
3
4020fd
For more information www.linear.com/LTC4020
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). PVIN = SENSVIN = CSP = CSN = BAT = 20V, SHDN = 2V,
C(TG1, BG1, TG2, BG2) = 1000pF, VRNG/SS = 2V.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INTVCC
Boost Refresh Supply Voltage
ILOAD = 5mA
l
4.85
5.0
5.15
V
Boost Refresh Supply Dropout
PVIN = 4.5V; IINTVCC = 5mA
4.46
V
Boost Refresh Supply Short-Circuit Current
Limit
VINTVCC = 0V
l
85
150
mA
IPVIN
PVIN Operating Current
Note 3; ITH = 0V
l
1.6
3
mA
Shutdown Current
VSHDN = 0
l
3
6
µA
ISENSVIN
SENSEVIN Operating Current
l
0.25
0.5
mA
Shutdown Current
VSHDN = 0
l
25
60
µA
ISENSTOP
SENSETOP Operating Current
32.5
µA
Shutdown Current
VSHDN = 0
0.1
µA
VFBMAX
DC/DC Converter Reference
Charging Terminated
l
2.7
2.75
2.8
V
SHDN
IC Enable Threshold (Rising)
Threshold Hysteresis
l
1.175
1.225
100
1.275
V
mV
SHDN Pin Bias Current
10
nA
VSENS
DC/DC Converter Inductor Current Limit
(Average Value)
VSENSVIN – VSENSTOP;
VSENSGND – VSENSBOT
l
45
50
60
mV
Reverse Current Inhibit
(Average Value)
VITH Falling (TG2 Disabled)
VITH Rising (TG2 Enabled)
l
0
2
6
mV
mV
ILIMIT
Inductor Current Limit Programming
VILIMIT = 0.5V; VILIMIT/VSENS(MAX)
20
V/V
ILIMIT Pin Bias Current
l
47.5
50
52.5
µA
ITH
Error Amp Current Limit
VFBMAX = 0, VITH = 1.3V
8
µA
Error Amp Transconductance
VFBMAX = 2.75V; VITH = 1.3V
95
umho
VC
High Side Current Sense Transconductance
(VSENSVIN – VSENSETOP) to IVC
VC = 1.8V
200
umho
Low Side Current Sense Transconductance
(VSENSGND – VSENSEBOT) to IVC
VC = 1.8V
200
umho
DCMAX
Maximum Duty Cycle
BG2: tON • fO
l
70
80
%
fO
Switching Frequency
RRT = 100k
RRT = 50k
RRT = 250k
l
235
250
500
100
265
kHz
kHz
kHz
tON
Minimum On Time
BG2
l
150
250
ns
tOFF
Minimum Off Time
TG1
l
300
500
ns
tTR
Gate Drive Transition Time
TG1, BG1, TG2, BG2
5
ns
tNOL
Gate Drive Non-Overlap time
(TG1 – SW1) to BG1,
(TG2 – SW2) to BG2
75
ns



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