MIC2174_10 Datasheet, PDF (4/27 Pages) Micrel Semiconductor – Synchronous Buck Controller Featuring Adaptive On-Time Control 40V Input, 300kHz

Micrel, Inc.
MIC2174/MIC2174C
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
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 (V_IN) ⁽⁵⁾
HSD Voltage Range (V_HSD)
Quiescent Supply Current
Standby Supply Current
Undervoltage Lockout Trip Level
UVLO Hysteresis
3.0
5.5
3.0
40
(V_FB = 1.5V, output switching but excluding external
MOSFET gate current)
1.4 3.0
V_IN = V_BST = 5.5V, V_HSD = 40V, LX = unconnected, EN =
GND ⁽⁶⁾
0.8
2
2.4 2.7
3
50
DC-DC Controller
Output-Voltage Adjust Range (V_OUT)
3.0V ≤ V_HSD ≤ 28V
28V < V_HSD ≤ 40V
0.8
5.5
0.8
3.6
Error Amplifier
FB Regulation Voltage
0°C ≤ T_J ≤ 85°C (MIC2174)
−40°C ≤ T_J ≤ 125°C (MIC2174)
-1
1
-2
2
T_J = 25°C (MIC2174C)
-3
3
FB Input Leakage Current
5 500
V_FB = 0.8V (MIC2174)
103 130 162
Current-Limit Threshold
V_FB = 0V (MIC2174)
V_FB = 0.8V(MIC2174C)
19 48 77
95 130 170
V_FB = 0V (MIC2174C)
15 48 80
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 V_TH.
6. The current will come only from the internal 100kΩ pull-up resistor sitting on the EN Input and tied to IN.
Units
V
V
mA
mA
V
mV
V
%
nA
mV
September 2010
4
M9999-091310-C