LTC3245_15 Datasheet, PDF (3/18 Pages) Linear Technology – Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump

LTC3245
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C, (Note 2). V_IN = 12V, V_OUT = 5V, C_FLY = 1µF unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
I_VIN
V_{OUT5_BM}
V_{OUT5_LN}
V_{OUT33_BM}
V_{OUT33_LN}
V_ADJ
R_CL
V_{PG_RISE}
V_{PG_FALL}
V_{PG_LOW}
I_{PG_HIGH}
V_LOW
V_HIGH
I_LOW
I_HIGH
I_{SHORT_CKT}
R_OUT
V_IN Quiescent Current
SEL1 = SEL2 = 0V
V_OUT Enabled, BURST = 0V
V_OUT Enabled, BURST = V_IN
Fixed 5V Burst Mode Output Regulation
(OUTS/ADJ Connected to V_OUT,
BURST = 0V, SEL2 = V_IN, SEL1 = 0V)
(Note 5)
Fixed 5V Low Noise Output Regulation
(OUTS/ADJ Connected to V_OUT,
BURST = V_IN, SEL2 = V_IN, SEL1 = 0V)
(Note 5)
Fixed 3.3V Burst Mode Output Regulation
(OUTS/ADJ Connected to V_OUT,
BURST = 0V, SEL2 = V_IN, SEL1 = V_IN)
(Note 5)
Fixed 3.3V Low Noise Output Regulation
(OUTS/ADJ Connected to V_OUT,
BURST = V_IN, SEL2 = V_IN, SEL1 = V_IN)
(Note 5)
OUTS/ADJ Reference Voltage (Note 4)
Load Regulation (Referred to ADJ)
PGOOD Rising Threshold
PGOOD Falling Threshold
PGOOD Output Low Voltage
PGOOD Output High Leakage
BURST, SEL1, SEL2 Input Voltage
BURST, SEL1, SEL2 input Voltage
BURST, SEL1, SEL2 Input Current
BURST, SEL1, SEL2 Input Current
I_VOUT Short-Circuit Current
Charge Pump Output Impedance
f_OSC
Oscillator Frequency
Shutdown, V_OUT = 0V
CP Enabled, Output in Regulation
CP Enabled, Output in Regulation
5V ≤ V_IN < 38V, I_OUT ≤ 250mA
4V ≤ V_IN < 5V, I_OUT ≤ 150mA
3.3V ≤ V_IN < 4V, I_OUT ≤ 75mA
3V ≤ V_IN < 3.3V, I_OUT ≤ 45mA
5V ≤ V_IN < 38V, I_OUT ≤ 200mA
4V ≤ V_IN < 5V, I_OUT ≤ 120mA
3.3V ≤ V_IN < 4V, I_OUT ≤ 60mA
3V ≤ V_IN < 3.3V, I_OUT ≤ 35mA
5V ≤ V_IN < 38V, I_OUT ≤ 250mA
4V ≤ V_IN < 5V, I_OUT ≤ 175mA
3.3V ≤ V_IN < 4V, I_OUT ≤ 110mA
2.7V ≤ V_IN < 3.3V, I_OUT ≤ 60mA
5V ≤ V_IN < 38V, I_OUT ≤ 220mA
4V ≤ V_IN < 5V, I_OUT ≤ 140mA
3.3V ≤ V_IN < 4V, I_OUT ≤ 90mA
2.7V ≤ V_IN < 3.3V, I_OUT ≤ 50mA
SEL2 = 0V, SEL1 = V_IN, I_OUT = 0mA
SEL2 = 0V, SEL1 = V_IN
V_OUT% of Final Regulation Voltage
V_OUT% of Final Regulation Voltage
I_PGOOD = 0.2mA
V_PGOOD = 5V
V_PIN = 0V
V_PIN = 38V
V_OUT = GND
2:1 Step-Down Mode
1:1 Step-Down Mode
1:2 Step-Up Mode (V_IN = 3.3V)
l 4.8
l 4.8
l 4.8
l 4.8
l 4.8
l 4.8
l 4.8
l 4.8
l 3.17
l 3.17
l 3.17
l 3.17
l 3.17
l 3.17
l 3.17
l 3.17
l 1.176
88
l
–1
l 0.4
l
–1
0.5
l
4
18
20
1.200
0.2
95
91
0.1
0
0.9
1.2
0
1
900
3
3.5
14
450
8
35
40
5.2
5.2
5.2
5.2
5.2
5.2
5.2
5.2
3.43
3.43
3.43
3.43
3.43
3.43
3.43
3.43
1.224
98
0.4
1
2
1
3
500
µA
µA
µA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mV/mA
%
%
V
µA
V
V
µA
µA
mA
Ω
Ω
Ω
kHz
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. This IC has overtemperature protection that is
intended to protect the device during momentary overload conditions.
Junction temperatures will exceed 150°C when overtemperature is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 2: The LTC3245E 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 LTC3245I is guaranteed over the
–40°C to 125°C operating junction temperature range. The LTC3245H is
guaranteed over the –40°C to 150°C operating junction temperature range
and the LTC3245MP is tested and guaranteed over the full –55°C to 150°C
operating junction temperature range. High junction temperatures degrade
operating lifetimes; operating lifetime is derated for junction temperatures
greater than 150°C. 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 resistance and
other environmental factors.
Note 3: The junction temperature (T_J, in °C) is calculated from the ambient
temperature (T_A, in °C) and power dissipation (P_D, in Watts) according to
the formula:
T_J = T_A + (P_D • θ_JA) where θ_JA (in °C/W) is the package thermal
impedance.
Note 4: V_OUT programming range is from 2.5V to 5V. See the
Programming the Output Voltage section for more detail.
Note 5: The maximum operating junction temperature of 150°C must be
followed. Certain combinations of input voltage and output current will
cause the junction temperature to exceed 150°C and must be avoided. See
Thermal Management section for information on calculating maximum
operating conditions.
3245fa
For more information www.linear.com/LTC3245
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