MIC2174 Datasheet, PDF (3/24 Pages) Micrel Semiconductor – 300kHz, Synchronous Buck Controller 300kHz, Synchronous Buck Controller

Micrel, Inc.
MIC2174
Absolute Maximum Ratings⁽¹⁾
IN, FB, EN to GND ........................................... -0.3V to +6V
BST to LX ......................................................... -0.3V to +6V
BST to GND ................................................... -0.3V to +46V
DH to LX.............................................-0.3V to (V_BST + 0.3V)
DL, COMP to GND ...............................-0.3V to (V_IN + 0.3V)
HSD to GND..................................................... -0.3V to 42V
PGND to GND ............................................... -0.3V to +0.3V
Junction Temperature .............................................. +150°C
Storage Temperature (T_S)..........................-65°C to +150°C
Lead Temperature (soldering, 10sec) ........................ 260°C
Operating Ratings⁽²⁾
Input Voltage (V_IN) .......................................... 3.0V to 5.5V
Supply Voltage (V_HSD) ....................................... 3.0V to 40V
Operating Temperature Range ..................-40°C to +125°C
Junction Temperature (T_J) .........................-40°C to +125°C
Junction Thermal Resistance
MSOP (θ_JA) ..................................................130.5°C/W
Continuous Power Dissipation (T_A = 70°C) .......421mW
(derate 5.6mW/°C above 70°C)
Electrical Characteristics⁽⁴⁾
V_BST - V_LX = 5V; T_A = 25°C, unless noted. Bold values indicate -40°C ≤ T_J ≤ +125°C.
Parameter
Condition
Min
Typ Max
General
Operating Input Voltage (VIN) ⁽⁵⁾
3.0
HSD Voltage Range (VHSD)
3.0
Quiescent Supply Current
(VFB = 1.5V, output switching but excluding
external MOSFET gate current)
Standby Supply Current
VIN = VBST = 5.5V, VHSD = 40V, LX = unconnected,
EN = GND ⁽⁶⁾
Under-voltage Lockout Trip Level
2.4
UVLO Hysteresis
5.5
40
1.4
3.0
0.8
2
2.7
3
50
DC-DC Controller
Output-Voltage Adjust Range
0.8
(VOUT) ⁽⁷⁾
Error Amplifier
FB Regulation Voltage
FB Regulation Voltage
FB Input Leakage Current
Current-Limit Threshold
0°C ≤ TJ ≤ 85°C
-40°C ≤ TJ ≤ 125°C
VFB = 0.8V
VFB = 0V
-1
1
-2
2
5
500
103
130 162
19
48
77
Soft-Start
Soft-start Period
6
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.
5. The application is fully functional at low IN (supply of the control section) if the external MOSFETs have enough low voltage VTH.
6. The current will come only from the internal 100kΩ pull-up resistor sitting on the EN Input and tied to IN.
7. The maximum VOUT value is limited by the Fixed TON estimator which obtains VOUT as a divided by 6 value (1/6).
Units
V
V
mA
mA
V
mV
V
%
%
nA
mV
mV
ms
September 2009
3
M9999-090409-B