MIC2870 Datasheet, PDF (4/25 Pages) Micrel Semiconductor – 1.5A Synchronous Boost Flash LED Driver with I2C Interface

Micrel, Inc.
MIC2870
Absolute Maximum Ratings⁽³⁾
Supply Voltage (V_IN) ..................................... −0.3V to +6.0V
Enable Input Voltage
(V_EN, V_FEN, V_FI, V_TEN) ....................... −0.3V to V_IN + 0.3V
V_OUT, V_LED1, and V_LED2 .................................... −0.3V to 6.0V
I²C I/O (V_SCL, V_SDA) ................................ −0.3V to V_IN + 0.3V
V_FRSET and V_TRSET .................................. −0.3V to V_IN + 0.3V
V_SW ................................................................. −0.3V to 6.0V
Power Dissipation⁽⁵⁾ (P_DISS) ....................... Internally Limited
Lead Temperature (soldering, 10s).......................... +260°C
Junction Temperature (T_J) ........................ −40°C to +150°C
Storage Temperature (T_S)......................... −40°C to +150°C
ESD Rating⁽⁶⁾................................. 2kV HBM and 150V MM
Operating Ratings⁽⁴⁾
Supply Voltage (V_IN) ..................................... +2.7V to +5.0V
Enable Input Voltage (V_EN, V_FEN, V_FI, V_TEN) ............ 0V to V_IN
I²C I/O (V_SCL, V_SDA) ................................................. 0V to V_IN
Junction Temperature (T_J) .......................... −40°C to 125°C
Package Thermal Resistance⁽⁵⁾
2mm × 2mm TQFN (θ_JA)....................................80°C/W
Electrical Characteristics⁽⁷⁾
VIN = 3.6V; L = 1μH, COUT = 2.2μF, RFRSET = 10kΩ, RTRSET = 10kΩ, ILED = 100mA; TA = 25°C, bold values indicate −40°C ≤ TJ ≤ 125°C,
unless otherwise noted.
Symbol
Parameter
Condition
Min. Typ. Max. Units
Power Supply
VIN
Input Voltage
2.7
5.0
V
VLED1 = VLED2 > 200mV, not switching
IVIN
Quiescent Current
VLED1 = VLED2 = 70mV, boost keeps switching
0.9
mA
4.2
IVIN(SD)
Shutdown Current
VEN = 0 V
0.6
µA
ISW(SD)
SW Pin Shutdown Current VEN = 0 V
1
5
µA
UVLO_Rise UVLO Threshold (Rising)
2.35
2.5
2.65
V
UVLO_Hyst UVLO Hysteresis
300
mV
VOUT
Output Voltage
Overvoltage Protection
Threshold
VIN ≥ VOUT
VOUT > VIN
VOUT > VIN
VIN
V
5.2
5.26 5.38
5.6
V
VOVP
Overvoltage Protection
Hysteresis
60
mV
OVP Blanking Time
24
µs
DMAX
Maximum Duty Cycle
80
85
90
%
DMIN
Minimum Duty Cycle
5.5
%
ISW_OC
Switch Current Limit
VIN = VOUT = 2.7V
3.35
4.5
5.65
A
Notes:
3. Exceeding the absolute maximum ratings may damage the device.
4. The device is not guaranteed to function outside its operating ratings.
5. The maximum allowable power dissipation of any TA (ambient temperature) is PDISS(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
6. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
7. Specification for packaged product only
September 5, 2013
4
Revision 1.0