LTC3882_15 Datasheet, PDF (7/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range,
V_SENSE1– = I_{AVG_GND} = GND =
otherwise specifications are at T_J = 25°C (Note 2). V_CC = 5V, V_SENSE0+
0V, f_SYNC = 500kHz (externally driven) unless otherwise specified.
=
V_SENSE1+
=
1.8V,
V_SENSE0–
=
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_HYST
I_PUWP
C_IN
Input Hysteresis
Input Pull-Up Current
Input Capacitance
SCL, SDA
WP = 0V
SCL, SDA, RUN0, RUN1, GPIO0, GPIO1, SYNC,
SHARE_CLK
80
mV
10
µA
10
pF
t_FILT
Input Digital Filter Delay
GPIO0, GPIO1
RUN0, RUN1
3
µs
10
µs
Digital Outputs (PWMn/TGn, ENn/BGn)
V_OL
Output Low Voltage
I_SINK = 2mA
V_OH
Output High Voltage
I_SOURCE = 2mA
t_RO
Output Rise Time
C_LOAD = 30pF, 10% to 90%
t_FO
Output Fall Time
C_LOAD = 30pF, 90% to 10%
Open Drain and Three State Outputs (SCL, SDA, RUNn, GPIOn, SYNC, SHARE_CLOCK, ALERT, PWMn, ENn)
l
300 mV
l 2.7
V
5
ns
4
ns
V_OL
Output Low Voltage
I_SINK = 3mA; SDA, SCL, GPIO0, GPIO1, ALERT, SYNC, l
RUN0, RUN1, SHARE_CLK
0.2 0.4
V
I_TEST
PWM Protocol Test Current
I_LKG
Output Leakage Current
EN0, EN1 = 3.3V, MFR_PWM_MODE_LTC3882[2:1] = 0
10
µA
0V ≤ PWM0, PWM1 ≤ V_DD33
0V ≤ EN0, EN1 ≤ V_DD33
0V ≤ GPIO0, GPIO1 ≤ 3.6V
0V ≤ SYNC, SHARE_CLK ≤ 3.6V
0V ≤ RUN0, RUN1 ≤ 5.5V
0V ≤ SCL, SDA, ALERT ≤ 5.5V
l –1
l –5
l –5
1
µA
5
µA
5
µA
Serial Bus Timing
f_SMB
t_BUF
t_HD,STA
Serial Bus Operating Frequency
Bus Free Time Between Stop and Start
Hold Time After (Repeated) Start
Condition. After This Period, the First
Clock Is Generated
l 10
l 1.3
l 0.6
400 kHz
µs
µs
t_SU,STA
t_SU,STO
t_HD,DAT
Repeated Start Condition Setup Time
Stop Condition Setup Time
Data Hold Time:
Receiving Data
Transmitting Data
l 0.6
l 0.6
l0
l 0.3
µs
µs
ns
0.9
µs
t_SU,DAT
t_TIMEOUT
t_LOW
t_HIGH
Input Data Setup Time
Clock Low Timeout
Serial Clock Low Period
Serial Clock High Period
l 100
l 25
l 1.3
l 0.6
ns
35
ms
10000 µs
µs
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3882 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC3882E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3882I is guaranteed
over the full –40°C to 125°C operating junction temperature range.
Junction temperature T_J is calculated in °C from the ambient temperature
T_A and power dissipation P_D according to the formula:
T_J = T_A + (P_D • θ_JA)
where θ_JA is the package thermal impedance. Note that the maximum
ambient temperature consistent with these specifications is determined by
specific operating conditions in conjunction with board layout, the rated
package thermal impedance and other environmental factors. Refer to the
Applications Information section.
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
3882f
For more information www.linear.com/LTC3882
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