MIC2198_05 Datasheet, PDF (3/14 Pages) Micrel Semiconductor – 500kHz 4mm × 4mm Synchronous Buck Controller

MIC2198
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
Micrel, Inc.
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
Feedback Voltage Reference
(±1%)
Feedback Voltage Reference
(±2%)
Feedback Voltage Reference
Feedback Bias Current
4.5V < V_IN < 32V, 0 < (V_CSH – V_OUT) < 60mV (±3%)
Output Voltage Range
Output Voltage Line Regulation
Output Voltage Load Regulation
Input and V_DD Supply
Quiescent Current
V_IN = 4.5V to 32V, V_CSH – V_OUT = 60mV
25mV < (V_CSH – V_OUT) < 60mV
excluding external MOSFET gate drive current
Shutdown Quiescent Current
Digital Supply Voltage (V_DD)
Undervoltage Lockout
Enable/UVLO
V_EN/UVLO = 0V
I_L = 0mA to 5mA
V_IN upper threshold (turn-on threshold)
V_IN lower threshold (turn-off threshold)
Enable Input Threshold
(rising)
UVLO Threshold
(rising)
Enable Input Current
Current Limit
V_EN/UVLO = 5V
Current Limit Threshold Voltage
Error Amplifier
(V_CSH – V_OUT)
Transconductance Error Amplifier GM
Oscillator Section
Oscillator Frequency
Maximum Duty Cycle
Minimum On-Time
Frequency Foldback Threshold
Foldback Frequency
measured at V_OUT pin
Gate Drivers
Rise/Fall Time
Output Driver Impedance
C_L = 3000pF
source
sink
Driver Non-Overlap Time
Min
0.792
0.784
0.776
0.8
Typ
0.8
10
0.03
0.5
Max
0.808
0.816
0.824
6
3.5
5
0.1
5
4.7
5.0
5.3
4.25 4.4
3.95 4.1
0.6
1.1
1.6
2.2
2.5
2.8
0.1
5
55
75
95
0.2
450 500 550
70
76
150 200
0.25 0.40 0.55
125
60
5
8.5
3.5
6
80
Note 1.
Note 2.
Note 3.
Note 4.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD protected; however, handling precautions are recommended. Human body model, 1.5k in series with 100pF.
Specification for packaged product only.
Units
V
V
V
nA
V
%/V
%
mA
µA
V
V
V
V
V
µA
mV
mS
kHz
%
ns
V
kHz
ns
Ω
Ω
ns
October 2005
3
MIC2198