October 2005 3 MIC2198
MIC2198 Micrel, Inc.
Absolute Maximum Ratings (Note 1)
Analog Supply Voltage (V
IN
) ........................................ +34V
Digital Supply Voltage (V
DD
) ..........................................+7V
Driver Supply Voltage (B
ST
) ...................................V
IN
+ 7V
Sense Voltage (V
OUT
, C
SH
) ...............................7V to –0.3V
Enable Pin Voltage (V
EN/UVLO
) ....................................... V
IN
Power Dissipation (P
D
)
4×4 MLF™ ..................................665mW @ T
A
= 85°C
Ambient Storage Temperature (T
S
) .......... –65°C to +150°C
ESD, Note 3 ................................................................ 2kV
Operating Ratings (Note 2)
Analog Supply Voltage (V
IN
) ......................... +4.5V to +32V
Output Voltage Range (V
OUT
) ....................... +0.8V to +6V
Junction Temperature (T
J
) ........................ –40°C to +125°C
Package Thermal Resistance
4×4 MLF-12L (θ
JA
) ............................................... 60°C/W
Electrical Characteristics (Note 4)
V
IN
= V
EN
= 12V; T
J
= 25°C, unless noted, bold values indicate –40°C ≤ T
J
≤ +125°C
Parameter Condition Min Typ Max Units
Feedback Voltage Reference (±1%) 0.792 0.8 0.808 V
Feedback Voltage Reference (±2%)
0.784 0.816 V
Feedback Voltage Reference 4.5V < V
IN
< 32V, 0 < (V
CSH
– V
OUT
) < 60mV (±3%) 0.776 0.824 V
Feedback Bias Current 10 nA
Output Voltage Range 0.8 6 V
Output Voltage Line Regulation V
IN
= 4.5V to 32V, V
CSH
– V
OUT
= 60mV 0.03 %/V
Output Voltage Load Regulation 25mV < (V
CSH
– V
OUT
) < 60mV 0.5 %
Input and V
DD
Supply
Quiescent Current excluding external MOSFET gate drive current 3.5
5 mA
Shutdown Quiescent Current V
EN/UVLO
= 0V 0.1 5 µA
Digital Supply Voltage (V
DD
) I
L
= 0mA to 5mA 4.7 5.0 5.3 V
Undervoltage Lockout V
IN
upper threshold (turn-on threshold) 4.25 4.4 V
V
IN
lower threshold (turn-off threshold) 3.95 4.1 V
Enable/UVLO
Enable Input Threshold (rising)
0.6 1.1 1.6 V
UVLO Threshold (rising)
2.2 2.5 2.8 V
Enable Input Current V
EN/UVLO
= 5V 0.1 5 µA
Current Limit
Current Limit Threshold Voltage (V
CSH
– V
OUT
) 55 75 95 mV
Error Amplifier
Transconductance Error Amplifier GM
0.2 mS
Oscillator Section
Oscillator Frequency 450 500 550 kHz
Maximum Duty Cycle 70 76 %
Minimum On-Time 150 200 ns
Frequency Foldback Threshold measured at V
OUT
pin 0.25 0.40 0.55 V
Foldback Frequency 125 kHz
Gate Drivers
Rise/Fall Time C
L
= 3000pF 60 ns
Output Driver Impedance source 5
8.5 Ω
sink 3.5
6 Ω
Driver Non-Overlap Time 80 ns
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. Devices are ESD protected; however, handling precautions are recommended. Human body model, 1.5k in series with 100pF.
Note 4. Specification for packaged product only.
