LTC3882_15 Datasheet, PDF (5/104 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_DD33 Linear Regulator
V_DD33
Internal V_DD33 Voltage
I_DD33
V_DD33 Current Limit
V_DD25 Linear Regulator
V_DD25
Internal V_DD25 Voltage
I_DD25
V_DD25 Current Limit
PWM Control Loops
V_CC ≥ 4.5V
V_DD33 = 2.8V
V_DD33 = 0V
l 3.2 3.3 3.4
V
85
mA
40
mA
2.25 2.5 2.75
V
95
mA
VINSNS
R_VINSNS
V_{OUT_R0}
V_IN Sense Voltage Range
VINSNS Input Resistance
Range 0 Maximum V_OUT
Range 0 Set Point Accuracy (Note 7)
Range 0 Resolution
Range 0 LSB Step Size
0.6V ≤ V_OUT ≤ 5V
0.6V ≤ V_OUT ≤ 5V
3
38
V
278
kΩ
5.25
V
±0.2
%
l –0.5
0.5
%
12
Bits
1.375
mV
V_{OUT_R1}
I_VSENSE
V_LINEREG
AVP
Range 1 Maximum V_OUT
Range 1 Set Point Accuracy (Note 7)
Range 1 Resolution
Range 1 LSB Step Size
0.6V ≤ V_OUT ≤ 2.5V
0.6V ≤ V_OUT ≤ 2.5V
2.65
V
±0.2
%
l –0.5
0.5
%
12
Bits
0.6875
mV
V_SENSE Input Current
VV_{SSEENNSSEE+–}
=
=
5.5V
0V
235
µA
–335
µA
V_CC Line Regulation, No Output Servo 4.5V ≤ V_CC ≤ 13.2V (See Test Circuit)
–0.02
0.02 %/V
AVP Set Accuracy, ∆V_OUT
Resolution
LSB Step Size
AVP = 10%, VOUT_COMMAND = 1.8V,
l –118
–96 mV
I_SENSE Differential Step 3mV (20%) to 12mV (80%)
IOUT_OC_WARN_LIMIT at 15mV
5
Bits
0.5
%
A_V(OL)
SR
Error Amplifier Open-Loop Voltage Gain
Error Amplifier Slew Rate
87
dB
9.5
V/µs
f_0dB
I_COMP
R_VSFB
Error Amplifier Bandwidth
Error Amplifier Output Current
Resistance Between V_SENSE+ and FB
Sourcing
Sinking
Range 0
Range 1
30
MHz
–2.6
mA
34
mA
l 52 67 83
kΩ
l 37 49 61
kΩ
V_ISENSE
I_ISENSE
I_{AVG_VOS}
I_SENSE Differential Input Range
I_SENSE± Input Current
I_AVG Current Sense Offset
0V ≤ V_PIN ≤ 5.5V
Referred to I_SENSE Inputs
±70
mV
–1 ±0.1 1
µA
±175
µV
l –600
650
µV
V_SIOS
Slave Current Sharing Offset
Referred to I_SENSE Inputs
±300
µV
l –800
700
µV
f_SYNC
SYNC Frequency Accuracy
Input Voltage Supervisor
250kHz ≤ f_SYNC ≤ 1.25MHz
l –10
10
%
N_VON
Input ON/OFF Resolution
LSB Step Size
8
Bits
143
mV
V_{ON_TOL}
Input ON/OFF Threshold Accuracy
Output Voltage Supervisors
15V ≤ V_{IN_ON} ≤ 35V
l –2
2
%
N_UVOV
Resolution
9
Bits
3882f
For more information www.linear.com/LTC3882
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