MIC23254 Datasheet, PDF (3/17 Pages) Micrel Semiconductor – 4MHz Dual 400mA Synchronous Buck Regulator with Low Input Voltage and HyperLight Load™

Micrel, Inc.
MIC23254
Absolute Maximum Ratings⁽¹⁾
Supply Voltage (V_IN) ........................................ −0.3V to +6V
Output Switch Voltage (V_SW) ............................. −0.3V to 6V
Sense Input Voltage (V_SNS1, V_SNS2) ................... −0.3V to V_IN
Logic Input Voltage (V_EN1, V_EN2) ........................ −0.3V to V_IN
Storage Temperature Range (T_s)..............–65°C to +150°C
ESD Rating⁽³⁾................................................. ESD Sensitive
Operating Ratings⁽²⁾
Supply Voltage (V_IN)......................................... 2.5V to 5.5V
Sense Input Voltage (V_SNS1, V_SNS2) ........................ 0V to V_IN
Logic Input Voltage (V_EN1, V_EN2) ............................. 0V to V_IN
Junction Temperature (T_J) ..................–40°C ≤ T_J ≤ +125°C
Thermal Resistance
2mm x 2mm Thin MLF-10 (θ_JA) .........................70°C/W
Electrical Characteristics⁽⁴⁾
T_A = 25°C with V_IN = V_EN1 = V_EN2 = 3.6V; L = 1µH; C_OUT = 4.7µF; I_OUT = 20mA; only one channel power is enabled, unless
otherwise specified. Bold values indicate –40°C< T_J < +125°C.
Parameter
Condition
Min. Typ. Max. Units
Under-Voltage Lockout Threshold
(Turn-On)
2.3
2.4 2.485
V
UVLO Hysteresis
60
mV
Quiescent Current
Shutdown Current
V_{OUT1, 2 (Both Enabled)}, I_{OUT1, 2} = 0mA , V_SNS1,2 >1.2 ×
V_{OUT1, 2} Nominal
V_{EN1, 2} = 0V; V_IN = 5.5V
33
50
µA
0.01
4
µA
Output Voltage Accuracy
V_IN = 3.6V, I_LOAD = 20mA
–2.5
+2.5
%
Current Limit in PWM Mode
SNS = 0.9 × V_{OUT NOM}
0.410 0.62
1
A
Output Voltage Line Regulation
V_IN = 3.6V to 5.5V, I_LOAD = 20mA
0.4
%/V
Output Voltage Load Regulation
20mA < I_LOAD < 400mA, V_IN = 3.6V
0.5
%
PWM Switch ON-Resistance
Frequency
Soft-Start Time
Enable Threshold
I_SW = 100mA PMOS
I_SW = −100mA NMOS
I_LOAD = 120mA
V_OUT = 90%
0.6
0.8
Ω
4
MHz
260
µs
0.5
0.9
1.2
V
Enable Input Current
0.1
2
µA
Over-Temperature Shutdown
160
°C
Over-Temperature Shutdown Hysteresis
20
°C
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: 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
May 2010
3
M9999-052510