LM3620 Datasheet, PDF (4/6 Pages) National Semiconductor (TI) – Lithium-Ion Battery Charger Controller

LM3620-8
V_DRIVE = 5V, I_DRIVE = 2mA.
limits with standard typeface
Limits
apply
with boldface
for T_A = 25˚C.
type
apply
over
the
full
operating
ambient
temperature
range,
0˚C
to
+
70˚C,
Symbol
Parameter
Conditions
Typical
Limit
Units
V_REG
Regulated Output Voltage (pin
1 to ground)
Pin 5 shorted to pin 1 (graphite
anode)
8.2
8.102/8.036
V(min)
8.298/8.364 V(max)
Pin 5 open (coke anode)
8.4
8.299/8.232
V(min)
8.501/8.568 V(max)
Regulated Output Voltage
Tolerance
Either Pin 5 setting
±1.2/±2.0
%
V_REG/V_DRIVE Supply Sensitivity
V_REG for 5V ≤ V_DRIVE ≤ 30V
200
I_Q
Quiescent Current
V_REG = 8.7V, V_EXT = 1.0V (Note 4)
400
I_OFF
Off State Current
V_DRIVE open circuited (Note 5)
10
I_DRIVE
Drive Pin Sink Current
V_DRIVE = 5.0V
20
Gm_(DRIVE)
Drive Pin Transconductance
∆I_DRIVE/∆V_REG
2mA ≤ I_DRIVE ≤15mA
1.5
I_EXT
External Pin Source Current
V_EXT = 1V (Note 6)
3
Gm_(EXT)
External Pin Transconductance
∆I_EXT/∆V_REG, V_EXT = 1V
0mA ≤ I_EXT ≤ 2.5mA
0.4
R_IN
V_REG Input Resistance
Pin 1 to Ground.
Circuit biased with V_DRIVE applied
110
V_DRIVE open circuited
42
µV/V(max)
750
µA(max)
200
nA(max)
15
mA(min)
A/V
2.5
mA(min)
A/V
kΩ
MΩ
R_F
Feedback Resistance
Pin 1 to Pin 5
2900
Ω
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is limited by T_JMAX (maximum junction temperature), θ_J-A
(junction-to-ambient thermal resistance) and T_A (ambient temperature). The maximum power dissipation at any temperature is: PDiss_MAX = (T_JMAX − T_A)/θ_J-A up to
the value listed in the Absolute Maximum Ratings.
Note 3: Rating is for the human body model, a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 4: Quiescent current is all current flowing to ground when the voltage at the V_REG pin is forced to be above the nominal regulating voltage (V_REG).
Note 5: Off current is all of the current flowing to ground including all leakage current that would be drawn from the battery connected to the V_REG terminal.
Note 6: When the External pin is being used as the driving source, it is recommended to keep the operating point of V_EXT ≤ 1V. If greater than 1V, the internal circuitry
would bias I_DRIVE to conduct up to the current limit level continuously causing unnecessary power dissipation in the device.
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