MIC2155_0911 Datasheet, PDF (6/35 Pages) Micrel Semiconductor – Two-Phase, Single-Output, PWM Synchronous Buck Control IC

Micrel, Inc.
MIC2155/2156
Absolute Maximum Ratings⁽¹⁾
Supply Voltage (V_IN 1, 2) .................................. -0.3V to 15V
Bootstrapped Voltage (V_BST) ................................... V_IN + 6V
SS, FB1, RMV_OUT, RM_GND, A_VDD, Sync, EA2+, FB2,
V_OUT .................................................................... -0.3V to 6V
CS1, EN1, EN2 ................................................ -0.3V to 15V
Junction Temperature Range...............-40°C ≤ T_J ≤ +125°C
Ambient Storage Temperature...................-65°C to +150°C
ESD .................................................... 100V Machine Model
1500V Human Body Model
Lead Temperature (soldering 10sec)......................... 260°C
Operating Ratings⁽²⁾
Supply Voltage (V_IN 1, 2)............................ +4.5V to +14.5V
Output Voltage Range...................................... 0.7V to 3.6V
Package Thermal Resistance
5mm × 5mm MLF^® (θ_JA) ....................................50°C/W
5mm × 5mm MLF^® (θ_JC).......................................5°C/W
Electrical Characteristics⁽³⁾
T_J = 25°C; V_EN = V_IN1 = V_IN2 =12V; unless otherwise specified. Bold values indicate -40°C≤T_J≤+125°C
Parameter
Condition
Min Typ
V_IN , V_DD and V_REF Supply
Total Supply Current,
I_VIN1 + I_VIN2
V_FB = 0.8V (both O/Ps; non-switching)
6
PWM Mode Supply Current
Shutdown Current
CH1 V_IN UVLO Start Voltage
CH1 V_IN UVLO Stop Voltage
CH2 V_IN UVLO Start Voltage
CH2 V_IN UVLO Stop Voltage
V_DD UVLO Start Voltage
V_DD UVLO Stop Voltage
V_IN UVLO Hysteresis
V_EN Shutdown Threshold
V_EN Hysteresis
Internal Bias Voltage (V_DD)
Oscillator / PWM Section
V_EN1 = V_EN2 = 0V
V_DD = Open
V_DD = Open
V_DD = Open
V_DD = Open
V_IN1 = V_DD for V_IN < 6V
V_IN1 = V_DD for V_IN < 6V
V_DD = open
(Each Channel)
(Each Channel)
I_VDD = -75mA
I_VDD = -50mA V_IN = 6V
210
3.6
4
3.4 3.97
2.5 2.7
2.3 2.5
3.6
3.3
40
0.6
1
30
4.9 5.25
4.9
5
PWM Frequency
MIC2155 450 510
MIC2156 270 310
Sync Range
Sync Input is 2x PWM Frequency
MIC2155 860
MIC2156 500
Sync Level
0.5
Maximum Duty Cycle
(each Channel)
80
Minimum Headroom
between VDD and VOUT
Required for remote sense amplifier use
Max
10
300
4.4
4.2
2.9
2.7
1.6
5.6
5.6
550
330
1200
680
3
1.3
Units
mA
µA
V
V
V
V
mV
V
mV
V
kHz
kHz
V
%
V
November 2009
6
M9999-111209-B