MIC22705_11 Datasheet, PDF (4/29 Pages) Micrel Semiconductor – 1MHz, 7A Integrated Switch High-Efficiency Synchronous Buck Regulator

Micrel, Inc.
MIC22705
Absolute Maximum Ratings^{(1, 2)}
PV_IN to PGND.................................................... –0.3V to 6V
SV_IN to PGND..................................................–0.3V to PV_IN
V_SW to PGND...................................................–0.3V to PV_IN
V_EN/DLY to PGND .............................................. -0.3V to PV_IN
V_PG to PGND ...................................................–0.3V to PV_IN
Junction Temperature ................................................ 150°C
PGND to SGND ............................................. –0.3V to 0.3V
Storage Temperature Range ....................–65°C to +150°C
Lead Temperature (soldering, 10s)............................ 260°C
Operating Ratings⁽³⁾
Supply Voltage ................................................. 2.9V to 5.5V
Power Good Voltage (V_PG)...................................0V to PV_IN
Enable Input (V_EN/DLY)...........................................0V to PV_IN
Junction Temperature (T_J) ..................–40°C ≤ T_J ≤ +125°C
Package Thermal Resistance
4mm x 4mm MLF^®-24 (θ_JC)................................14°C/W
4mm x 4mm MLF^®-24 (θ_JA)................................40°C/W
Electrical Characteristics⁽⁴⁾
SV_IN = PV_IN = V_EN/DLY = 3.3V, V_OUT = 1.8V, T_A = 25°C, unless noted. Bold values indicate –40°C< T_J < +125°C.
Parameter
Condition
Min. Typ.
Power Input Supply
Input Voltage Range (PV_IN)
Undervoltage Lockout Trip Level
UVLO Hysteresis
PV_IN Rising
2.9
2.55 2.75
420
Quiescent Supply Current
Shutdown Current
Reference
V_FB = 0.9V (not switching)
V_EN/DLY = 0V
0.85
5
Feedback Reference Voltage
0.686 0.7
Load Regulation
I_OUT = 100mA to 7A
0.2
Line Regulation
V_IN = 2.9V to 5.5V; I_OUT = 100mA
0.2
FB Bias Current
V_FB = 0.5V
10
Enable Control
EN/DLY Threshold Voltage
1.14 1.24
EN Hysteresis
10
EN/DLY Bias Current
RC Ramp Control
V_EN/DLY = 0.5V; V_IN = 2.9V and V_IN = 5.5V
0.7
1.0
RC Pin Source Current
Oscillator
V_RC = 0.35V
0.7
1.0
Switching Frequency
0.8
1.0
Maximum Duty Cycle
V_FB ≤ 0.5V
100
Short-Current Protection
Current Limit
V_FB = 0.5V
7
11
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. Devices are ESD sensitive. Handling precautions recommended.
3. The device is not guaranteed to function outside its operating rating.
4. Specification for packaged product only.
Max.
5.5
2.9
1.3
10
0.714
1.34
1.3
1.3
1.2
21
Units
V
V
mV
mA
µA
V
%
%
nA
V
mV
µA
µA
MHz
%
A
March 2011
4
M9999-033111-A