August 2005 3 MIC79050
MIC79050 Micrel, Inc.
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
Battery Voltage Accuracy variation from nominal V
OUT
–5°C to +60°C –0.75 +0.75 %
ΔV
BAT
/ΔT Battery Voltage Note 4 40
ppm/°C
Temperature Coefficient
ΔV
BAT
/V
BAT
Line Regulation V
IN
= V
BAT
+ 1V to 16V 0.009 0.05 %/V
0.1 %/V
ΔV
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
Ground Pin Quiescent Current, V
EN
≤ 0.4V (shutdown) 0.05 3 µA
Note 8
V
EN
≤ 0.18V (shutdown) 0.10 8 µA
PSRR Ripple Rejection f = 120Hz 75 dB
I
LIMIT
Current Limit V
BAT
= 0V 750 900 mA
1000 mA
ΔV
BAT
/ΔP
D
Thermal Regulation Note 9 0.05 %/W
ENABLE Input
V
ENL
Enable Input Logic-Low Voltage V
EN
= logic low (shutdown) 0.4 V
0.18 V
V
EN
= logic high (enabled) 2.0 V
I
ENL
Enable Input Current V
ENL
≤ 0.4V (shutdown) 0.01 –1 µA
V
ENL
≤ 0.18V (shutdown) 0.01 –2 µA
I
ENH
V
ENH
≥ 2.0V (enabled) 5 20 µA
25 µA
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. 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.
Note 4. Battery voltage temperature coefficient is the worst case voltage change divided by the total temperature range.
Note 5. 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.
Note 6. 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.
Note 7: 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.
Note 8: V
EN
is the voltage externally applied to devices with the EN (enable) input pin. [MSO-8(MM) and SO-8 (M) packages only.]
Note 9: Thermal regulation is the change in battery voltage at a time “t” after a change in power dissipation is applied, excluding load or line regulation
effects. Specifications are for a 500mA load pulse at V
IN
= 16V for t = 10ms.
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
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
SOIC-8(
θ
JA
) ......................................................... 63°C/W
SOT-223(
θ
JC
) ......................................................15°C/W
