MIC79050 Datasheet, PDF (3/20 Pages) Micrel Semiconductor – Simple Lithium-Ion Battery Charger Preliminary Information

MIC79050
Absolute Maximum Ratings (Note 1)
Supply Input Voltage (V_IN) ............................ –20V to +20V
Power Dissipation (P_D) ............... Internally Limited, Note 3
Junction Temperature (T_J) ....................... –40°C to +125°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Storage Temperature (T_S) ....................... –65°C to +150°C
Micrel
Operating Ratings (Note 2)
Supply Input Voltage (V_IN) ........................... +2.5V to +16V
Enable Input Voltage (V_EN) .................................. 0V to V_IN
Junction Temperature (T_J) ....................... –40°C to +125°C
Package Thermal Resistance (Note 3) ...............................
MSOP-8 (θ_JA) ...................................................... 80°C/W
SOP-8(θ_JA) .......................................................... 63°C/W
SOT-223(θ_JC) ...................................................... 15°C/W
Electrical Characteristics
V_IN = V_BAT + 1.0V; C_OUT = 4.7µF, I_OUT = 100µA; T_J = 25°C, bold values indicate –40°C ≤ T_J ≤ +125°C; unless noted.
Symbol
Parameter
Conditions
Min Typical Max
Units
V_BAT
∆V_BAT/∆T
Battery Voltage Accuracy
Battery Voltage
Temperature Coefficient
variation from nominal V_OUT –5°C to +60°C –0.75
+0.75 %
Note 4
40
ppm/°C
∆V_BAT/V_BAT Line Regulation
V_IN = V_BAT + 1V to 16V
0.009 0.05 %/V
0.1 %/V
∆V_BAT/V_BAT Load Regulation
I_OUT = 100µA to 500mA, Note 5
0.05 0.5
%
0.7
%
V_IN – V_BAT Dropout Voltage, Note 6
I_OUT = 500mA
380 500 mV
600 mV
I_GND
Ground Pin Current, Notes 7, 8
V_EN ≥ 3.0V, I_OUT = 100µA
85
130
µA
170
µA
V_EN ≥ 3.0V, I_OUT = 500mA
11
20
mA
25
mA
I_GND
PSRR
Ground Pin Quiescent Current,
Note 8
Ripple Rejection
V_EN ≤ 0.4V (shutdown)
V_EN ≤ 0.18V (shutdown)
f = 120Hz
0.05
3
µA
0.10
8
µA
75
dB
I_LIMIT
Current Limit
V_BAT = 0V
750 900 mA
1000 mA
∆V_BAT/∆P_D Thermal Regulation
ENABLE Input
Note 9
0.05
%/W
V_ENL
Enable Input Logic-Low Voltage
V_EN = logic low (shutdown)
0.4
V
0.18
V
I_ENL
I_ENH
Enable Input Current
V_EN = logic high (enabled)
V_ENL ≤ 0.4V (shutdown)
V_ENL ≤ 0.18V (shutdown)
V_ENH ≥ 2.0V (enabled)
2.0
V
0.01 –1
µA
0.01 –2
µA
5
20
µA
25
µA
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7:
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
The maximum allowable power dissipation at any T_A (ambient temperature) is calculated using: P_D(max) = (T_J(max) – T_A) ÷ θ_JA. Exceeding the
maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
Battery voltage temperature coefficient is the worst case voltage change divided by the total temperature range.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
range from 100µA to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Dropout voltage is defined as the input to battery output differential at which the battery voltage drops 2% below its nominal value measured at
1V differential.
Ground pin current is the charger quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the
load current plus the ground pin current.
June 2000
3
MIC79050