LTC3520 Datasheet, PDF (3/24 Pages) Linear Technology – Synchronous 1A Buck-Boost and 600mA Buck Converters

LTC3520
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C, S_VIN = P_VIN1 = P_VIN2 = P_VIN3 = 3.6V, V_OUT1 = 3.3V, R_T = 54.9k, unless
otherwise noted.
PARAMETER
Feedback Voltage (FB2 Pin)
Feedback Input Current (FB2 Pin)
PMOS Current Limit
Maximum Duty Cycle
Minimum Duty Cycle
Soft-Start Charging Current
⎯S⎯D⎯2 Input High Voltage
⎯S⎯D⎯2 Input Low Voltage
⎯S⎯D⎯2 Input Current
Buck-Boost Converter
Output Voltage
PMOS Switch Resistance
NMOS Switch Resistance
NMOS Switch Leakage
PMOS Switch Leakage
Feedback Voltage (FB1 Pin)
Feedback Input Current (FB1 Pin)
Forward Current Limit
Reverse Current Limit
Burst Mode Operation Current Limit
Error Amplifier Gain
Error Amplifier Sink Current
Error Amplifier Source Current
Maximum Duty Cycle
Minimum Duty Cycle
Soft-Start Charging Current
⎯S⎯D⎯1, PWM1 Input High Voltage
⎯S⎯D⎯1, PWM1 Input Low Voltage
⎯S⎯D⎯1, PWM1 Input Current
Gain Block
Quiescent Current
A_IN Pin Threshold Voltage
A_IN Pin Input Bias Current
A_OUT Sink Current
A_OUT Source Current
A_OUT Pin Voltage
Open Loop Gain
CONDITIONS
(Note 4)
(Note 3)
V_FB2 = 0.72V
V_FB2 = 0.88V
MIN
● 0.771
● 0.8
● 100
●
1.4
TYP
0.790
1
1.25
6
0.01
MAX
0.809
50
0
0.4
1
UNITS
V
nA
A
%
%
µA
V
V
µA
● 2.2
5.25
V
0.20
Ω
0.15
Ω
V_SW1A = V_SW1B = 5V, S_VIN = P_VIN1 = P_VIN2 = P_VIN3 = 5V
0.1
5
µA
V_SW1A = V_SW1B = 0V, S_VIN = P_VIN1 = P_VIN2 = P_VIN3 = 5V
0.1
10
µA
● 0.766 0.782 0.798
V
1
50
nA
(Note 3)
● 1.4
2
A
(Note 3)
560
mA
(Note 3)
325
mA
80
dB
500
µA
14
µA
Boost (% Switch C is On)
Buck (% Switch A is On)
● 70
80
%
100
%
●
0
%
6
µA
1.4
V
0.4
V
0.01
1
µA
V_AIN = 0.88V, V⎯_S⎯_D⎯₁ = V⎯_S⎯_D⎯₂ = 0V
V_AIN = 0.72V, V_AOUT = 1.8V
V_AIN = 0.88V, V_AOUT = 1.8V
V_AIN = 0.72V, I_AOUT = 1mA
45
µA
● 0.770 0.786 0.802
V
1
50
nA
17
mA
18
µA
25
150
mV
80
dB
3520f
3