MIC2168A Datasheet, PDF (3/18 Pages) Micrel Semiconductor – 1MHz PWM Synchronous Buck Control IC

Micrel
MIC2168A
Absolute Maximum Ratings⁽¹⁾
Supply Voltage (V_IN) ........................................... 15.5V
Bootstrapped Voltage (V_BST) ............................V_IN +5V
Junction Temperature (T_J).......... –40°C ≤ T_J ≤ +125°C
Storage Temperature (T_S) ................ –65°C to +150°C
Operating Ratings⁽²⁾
Supply Voltage (V_IN) ............................. +3V to +14.5V
Output Voltage Range ....................0.8V to V_IN × D_MAX
Package Thermal Resistance
10-Pin MSOP (θ_JA) .................................. 180°C/W
Electrical Characteristics⁽³⁾
T_J = 25°C, V_IN = 5V, unless otherwise specified. Bold values indicate –40°C < T_J < +125°C
Parameter
Condition
Min.
Feedback Voltage Reference
(± 1%)
0.792
Feedback Voltage Reference
(± 2% over temp)
0.784
Feedback Bias Current
Output Voltage Line Regulation
Output Voltage Load Regulation
Output Voltage Total Regulation
Oscillator Section
3V ≤ V_IN ≤ 14.5V; 1A ≤ I_OUT ≤ 10A; (V_OUT = 2.5V)⁽⁴⁾
Oscillator Frequency
900
Maximum Duty Cycle
90
Minimum On-Time⁽⁴⁾
Input and V_DD Supply
PWM Mode Supply Current
V_CS = V_IN –0.25V; V_FB = 0.7V
(output switching but excluding external MOSFET
gate current.)
Shutdown Quiescent Current
V_COMP/EN=0V
VCOMP Shutdown Threshold
0.1
VCOMP Shutdown Blanking
Period
C_COMP = 100nF
Digital Supply Voltage (V_DD)
V_IN ≥ 6V
4.7
Error Amplifier
DC Gain
Transconductance
Soft Start
Soft-Start Current
After timeout of internal timer.
(See “Soft-Start” section.)
Current Sense
CS Overcurrent Trip Point
V_CS = V_IN –0.25V
160
Temperature Coefficient
Typ.
0.8
0.8
30
0.03
0.5
0.6
1000
30
1.6
50
0.25
4
5
70
1
8.5
200
+1800
Max.
0.808
0.816
100
Units
V
V
nA
%/V
%
%
1100 kHz
60
ns
3
mA
150
µA
0.4
V
ms
5.3
V
dB
ms
µA
240
µA
ppm/°C
Notes:
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when
operating the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction
temperature, T_J(max), the junction-to-ambient thermal resistance, θ_JA, and the ambient temperature, T_A. The maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
2. Devices are ESD sensitive, handling precautions required.
3. Specification for packaged product only.
4. Guaranteed by design.
January 2010
3
M9999-011510