LTC3576-1_15 Datasheet, PDF (6/48 Pages) Linear Technology – Switching Power Manager with USB On-the-Go Triple Step-Down DC/DCs

LTC3576/LTC3576-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_BUS = 5V, BAT = 3.8V, DV_CC = 3.3V, R_CLPROG = 3.01k, unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
I_VIN1,2,3
Pulse-Skipping Mode Input Current
Burst Mode^® Input Current
LDO Mode Input Current
Shutdown Input Current Limit
V_FBHIGH1,2,3
Maximum Servo Voltage
V_FBLOW1,2,3
Minimum Servo Voltage
V_LSB1,2,3
V_FB1,2 Servo Voltage Step Size
R_{LDO_CL1,2,3}
LDO Mode Closed-Loop R_OUT
R_{LDO_OL1,2,3}
LDO Mode Open-Loop R_OUT
General Purpose Switching Regulator 1 and 2
I_OUT1,2,3 = 0μA (Note 9)
I_OUT1,2,3 = 0μA (Note 9)
I_OUT1,2,3 = 0μA (Note 9)
I_OUT1,2,3 = 0μA, FB1,2,3 = 0V
Full Scale (1,1,1,1) (Note 10)
Zero Scale (0,0,0,0) (Note 10)
V_FB1,2,3 = V_{OUT1,2 3} = 0.8V
(Note 11)
I_LIM1,2
PMOS Switch Current Limit
Pulse-Skipping/Burst Mode
Operation (Note 5)
I_OUT1,2
Available Output Current
R_P1,2
PMOS R_DS(ON)
R_N1,2
NMOS R_DS(ON)
General Purpose Switching Regulator 3
LDO Mode
I_LIM3
PMOS Switch Current Limit
Pulse-Skipping/Burst Mode
Operation (Note 5)
I_OUT3
R_P3
R_N3
t_RST3
Available Output Current
PMOS R_DS(0N)
NMOS R_DS(ON)
Power-On Reset Time for Switching
Regulator
LDO Mode
R^VFS^BT³3^{WHiit-hZin 92% of Final Value to}
Burst Mode is a registered trademark of Linear Technology Corporation.
MIN
l 0.78
0.405
600
50
1300
50
TYP
90
20
15
0.80
0.425
25
0.25
2.5
900
0.6
0.7
1800
0.18
0.3
230
MAX
35
25
1
0.82
0.445
1300
2800
UNITS
μA
μA
μA
μA
V
V
mV
Ω
Ω
mA
mA
Ω
Ω
mA
mA
Ω
Ω
ms
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 LTC3576E/LTC3576E-1 are guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: The LTC3576E/LTC3576E-1 include overtemperature protection
that is intended to protect the device during momentary overload
conditions. Junction temperature will exceed 125°C when overtemperature
protection is active. Continuous operation above the specified maximum
operating junction temperature may impair device reliability.
Note 4: Total input current is the sum of quiescent current, I_VBUSQ, and
measured current given by V_CLPROG/R_CLPROG • (h_CLPROG + 1).
Note 5: The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the maximum specified pin current rating may result in device
degradation or failure.
Note 6: The bidirectional switcher’s supply current is bootstrapped to V_BUS
and in the application will reflect back to V_OUT by (V_BUS/V_OUT) •
1/efficiency. Total quiescent current is the sum of the current into the
V_OUT pin plus the reflected current.
Note 7: h_C/10 is expressed as a fraction of the measured full charge
current with indicated PROG resistor.
Note 8: V_OUT not in UVLO.
Note 9: FBx above regulation such that regulator is in sleep. Specification
does not include resistive divider current reflected back to V_INx.
Note 10: Applies to pulse-skipping and Burst Mode operation only.
Note 11: Inductor series resistance adds to open-loop R_OUT.
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