Linear Technology Analog Devices LTC3882-1, Datasheet

Page: 5 / 108

LTC3882-1
5
Rev A
For more information www.analog.com
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IC Supply
V
CC
V
CC
Voltage Range V
DD33
= Internal LDO 4.5 13.8 V
V
DD33_EXT
V
DD33
Voltage Range V
CC
= V
DD33
(Note 6)
l
3 3.6 V
V
UVLO
Undervoltage Lockout Threshold V
DD33
Rising
Hysteresis
l
42
3 V
mV
I
Q
IC Operating Current 32 mA
t
INIT
Controller Initialization Time Delay from RESTORE_USER_ALL, MFR_RESET or
V
DD33
> V
UVLO
Until TON_DELAY Can Begin
35 ms
V
DD33
Linear Regulator
V
DD33
V
DD33
Regulator Output Voltage V
CC
≥ 4.5V 3.2 3.3 3.4 V
I
DD33
V
DD33
Current Limit V
DD33
= 2.8V
V
DD33
= 0V
85
40
mA
mA
V
DD25
Linear Regulator
V
DD25
V
DD25
Regulator Output Voltage 2.25 2.5 2.75 V
I
DD25
V
DD25
Current Limit 95 mA
PWM Control Loops
VINSNS V
IN
Sense Voltage Range 3 38 V
R
VINSNS
VINSNS Input Resistance 278 kΩ
V
OUT_R0
Range 0 Maximum V
OUT
Range 0 Set Point Error (Note 7)
Range 0 Set Point Resolution
0.6V ≤ V
OUT
≤ 5V
0.6V ≤ V
OUT
≤ 5V
l
–0.5
5.25
±0.2
1.375
0.5
V
%
%
mV
V
OUT_R1
Range 1 Maximum V
OUT
Range 1 Set Point Error (Note 7)
Range 1 Set Point Resolution
0.6V ≤ V
OUT
≤ 2.5V
0.6V ≤ V
OUT
≤ 2.5V
l
–0.5
2.65
±0.2
0.6875
0.5
V
%
%
mV
I
VSENSE
V
SENSE
Input Current V
SENSE
+
= 5.5V
V
SENSE
–
= 0V
235
–335
µA
µA
V
LINEREG
V
CC
Line Regulation, No Output Servo 4.5V ≤ V
CC
≤ 13.2V (See Test Circuit) –0.02 0.02 %/V
AVP AVP ∆V
OUT
AVP = 10%, VOUT_COMMAND = 1.8V,
I
SENSE
Differential Step 3mV to 12mV
with IOUT_OC_WARN_LIMIT = 15mV
l
–118 –108 –96 mV
A
V(OL)
Error Amplifier Open-Loop Voltage Gain 87 dB
SR Error Amplifier Slew Rate 9.5 V/µs
f
0dB
Error Amplifier Bandwidth (Note 12) 30 MHz
I
COMP
Error Amplifier Output Current Sourcing
Sinking
–2.6
34
mA
mA
R
VSFB
Resistance Between V
SENSE
+
and FB Range 0
Range 1
l
l
52
37
67
49
83
61
kΩ
kΩ
V
ISENSE
I
SENSE
Differential Input Range ±70 mV
I
ISENSE
I
SENSE
±
Input Current 0V ≤ V
PIN
≤ 5.5V –1 ±0.1 1 µA
I
AVG_VOS
I
AVG
Current Sense Offset Referred to I
SENSE
Inputs
l
–600
±175
650
µV
µV
V
SIOS
Slave Current Sharing Offset Referred to I
SENSE
Inputs
l
–800
±300
700
µV
µV
f
SYNC
SYNC Frequency Error 250kHz ≤ f
SYNC
≤ 1.25MHz
l
–10 10 %
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
J
= 25°C (Note 2). V
CC
= 5V, V
SENSE0
+
= V
SENSE1
+
= 1.8V, V
SENSE0
–
=
V
SENSE1
–
= I
AVG_GND
= GND = 0V, f
SYNC
= 500kHz (externally driven) unless otherwise specified.