MIC2124 Datasheet, PDF (3/24 Pages) Micrel Semiconductor – Constant Frequency, Synchronous Current Mode Buck Controller

Micrel, Inc.
MIC2124
Absolute Maximum Ratings⁽¹⁾
IN, FB to GND .................................................. -0.3V to +6V
BST to LX ......................................................... -0.3V to +6V
BST to GND ................................................... -0.3V to +35V
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 29V
PGND to GND ............................................... -0.3V to +0.3V
Power Dissipation T_A=70°C ⁽³⁾................... Internally Limited
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 18V
Ambient Temperature (T_A) ...........................-40°C to +85°C
Junction Temperature (T_J) .........................-40°C to +125°C
Junction Thermal Resistance MSOP (θ_JA) ............130°C/W
Junction Thermal Resistance MSOP (θ_JC) ..............43°C/W
Electrical Characteristics⁽⁵⁾
V_HSD = 13.2V, V_IN = 5V, V_BST - V_LX = 5V; T_A = 25°C, unless noted. Bold values indicate -40°C ≤ T_A ≤ +85°C.
Parameter
Conditions
Min
Typ Max
General
Operating Input Voltage (VIN) ⁽⁶⁾
HSD Voltage Range (VHSD)
Quiescent Supply Current
Shutdown Current
Under-Voltage Lockout
Under-voltage Lockout Trip Level
UVLO Hysteresis
DC-DC Controller
VFB = 1.5V
VEN/COMP = GND
Rising edge
3.0
5.5
3.0
18
1.4
2
1
2
2.5
2.7
2.93
40
Output-Voltage Adjust Range
(VOUT)
Error Amplifier
FB Regulation Voltage
FB Regulation Voltage
Transconductance gm
COMP Output Voltage Swing
FB Input Leakage Current
On Timer
Depends on external components and the
maximum duty cycle.
0°C ≤ TA ≤ 85°C
-40°C ≤ TA ≤ 85°C
VFB = 0.8V
0.8
-1
±0.2
1
-2.5
±0.2
1
70
110 160
0.5
2.3
1
500
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Short Current Protection
VHSD = 4V, VIN = 5V, VLX = 3.33V
FB > 0.8V
240
300
360
89
91
93
0
Current Limit 1
Current Limit 2
VFB = 0.8V
VFB = 0V
110
127 145
21
36
51
Units
V
V
mA
mA
V
mV
V
%
%
µS
V
nA
kHz
%
%
mV
mV
June 2010
3
M9999-060810-D