MIC4742 Datasheet, PDF (4/23 Pages) Micrel Semiconductor – 2 MHz Dual 2A Integrated Switch Buck Regulator

Micrel, Inc.
MIC4742
Absolute Maximum Ratings⁽¹⁾
Supply Voltage (V_IN) ......................................... -0.3V to +6V
Output Switch Voltage (V_SW1, V_SW2).................. -0.3V to +6V
Output Switch Current (I_SW1, I_SW2)………...Internally Limited
Input Voltage (V_EN), (V_FB), (V_BIAS) .......................-0.3V to V_IN
Storage Temperature (T_s) .........................–60°C to +150°C
Junction Temperature ................................................ 150°C
Lead Temperature (soldering, 10sec.)....................... 260°C
ESD Rating⁽³⁾................................................................. 2KV
Operating Ratings⁽²⁾
Supply Voltage (V_IN)..................................... +2.9V to +5.5V
Logic Input Voltage (V_EN) ....................................... 0V to V_IN
Junction Temperature (T_J) ........................ –40°C to +125°C
Junction Thermal Resistance
3mm x 3mm MLF^® (θ_JA).....................................60°C/W
EPAD TSSOP (θ_JA)............................................35°C/W
Electrical Characteristics⁽⁴⁾
V_IN = V_EN = 3.6V; L = 1.0µH; C_OUT = 4.7µF; T_A = 25°C, unless noted. Bold values indicate –40°C< T_J < +125°C.
Parameter
Condition
Min Typ Max
Supply Voltage Range
2.9
5.5
Under-Voltage Lockout Threshold Turn-on
2.45 2.6
2.7
UVLO Hysteresis
100
Quiescent Current
V_FB = 0.9 * V_NOM (not switching); V_IN = 5.5V
1.4
3.0
V_FB = 0.9 * V_NOM (not switching); V_IN = 3.6V
1.0
Shutdown Current
V_EN = 0V
1.6
10
[Adjustable] Feedback Voltage
± 2% (over temperature) I_LOAD = 100µA
0.588 0.6 0.612
FB pin input current
1
Current Limit
V_FB = 0.9 * V_NOM
2.5
4.3
Output Voltage Line Regulation
V_IN = 2.9V to 5.5V; I_LOAD= 100 µA
0.07
Output Voltage Load Regulation
20mA < I_LOAD < 2A
0.2
Maximum Duty Cycle
V_FB ≤ 0.9 * V_NOM
100
Switch ON-Resistance
I_SW = 50mA V_FB =GND
155
Oscillator Frequency
Switching Phase
Enable Threshold
Enable Hysteresis
Enable Input Current
Over-Temperature Shutdown
Over-Temperature Hysteresis
1.5
2
2.3
180
0.5
0.9
1.3
55
0.1
2
153
18
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
Units
V
V
mV
mA
mA
µA
V
nA
A
%
%
%
mΩ
MHz
Deg
V
mV
µA
°C
°C
March 2009
4
M9999-030209-D