LTC4020_15 Datasheet, PDF (5/42 Pages) Linear Technology – 55V Buck-Boost Multi-Chemistry Battery Charger

LTC4020
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
CONDITIONS
MIN TYP MAX UNITS
BGATE
BGATE Pull-Down Current
Charging Enabled
15
µA
BGATE Pull-Up Current
BGATE Standby Pull-Down Current
Ideal Diode Pull-Down Current
Ideal Diode Forward Voltage
Charging Disabled; V_CSN – V_BGATE = 2V
15
µA
V_SHDN = 0V
120
µA
Charging Disabled; V_BAT – V_CSN = 0.5V
500
µA
V_BAT – V_CSN; V_CSN Measured Through
l
5
14
20
mV
100Ω Series Resistor
TIMER
Timer High Threshold
1.5
V
Timer Low Threshold
1.0
V
C/10 Mode Threshold (Rising)
l 0.4
0.5
0.6
V
C/10 Mode Hysteresis
225
mV
V_STAT(L)
I_VFBMIN
I_VFB
I_{VIN_REG}
I_FBG
R_NTC
R_FBG
Timer Source/Sink Current
Status Pins Enabled Voltage
Instant-On Feedback Bias Current
Feedback Pin Bias Current
Input Regulation Bias Current
Pin Current (Disabled)
NTC Minimum Disable Resistance
FBG Resistance to SGND
V_TIMER = 1.25V
I_STAT1 = 1mA; I_STAT2 = 1mA
I_STAT1 = 5mA; I_STAT2 = 5mA
V_SHDN = 0V; V_FBG = 55V
I_FBG = 1mA
l 8.5
10
11.5
µA
l
0.15
0.4
V
l
0.75
2.5
V
10
nA
10
nA
10
nA
10
nA
l 250
400
kΩ
l
20
50
Ω
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 LTC4020 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC4020E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LTC4020I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The junction temperature (T_J) is calculated from
the ambient temperature (T_A) and power dissipation (PD) according
to the formula T_J = T_A + (PD • θJ_A). 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 resistance and other environmental factors. This IC includes
overtemperature protection that is intended to protect the device during
momentary overload. Junction temperature will exceed 125°C when
overtemperature protection is active. Continuous operation above the
specified maximum operating junction temperature may impair device
reliability.
Note 3: ICC does not include switching currents. V_BST1 = V_BST2 = V_INTVCC
and V_SW1 = V_SW2 = 0V for testing.
Note 4: See Typical Performance Characteristics
For more information www.linear.com/LTC4020
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