LTC3676/LTC3676-1
4
3676fe
For more information www.linear.com/LTC3676
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
= PV
IN1
= PV
IN2
= PV
IN3
= PV
IN4
= V
IN_L2
= V
IN_L3
=
V
IN_L4
= DV
DD
= 3.8V. All regulators disabled unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Input Supply Voltage, V
IN
l
2.7 5.5 V
V
IN
Standby Current PWR_ON = 0V
l
12 21 µA
Step-Down Switching Regulators 1, 2, 3 and 4
Output Voltage Range V
FB
PV
IN
V
Burst Mode
®
V
IN
Quiescent Current
Pulse-Skipping Mode V
IN
Quiescent Current
Forced Continuous V
IN
Quiescent Current
V
FB
= 850mV (Note 5)
V
FB
= 850mV (Note 5)
V
FB
= 0V (Note 5)
l
l
l
23
120
170
50
200
300
µA
µA
µA
Feedback Pin Input Current V
FB
= 850mV –0.05 0.05 µA
Maximum Duty Cycle V
FB
= 0V 100 %
SW Pull-Down Resistance Regulator Disabled 625 Ω
Feedback Reference Soft-Start Rate (Note 6) 0.8 V/ms
High Feedback Regulation Voltage (V
FB
) DVBxA[4:0] = DVBxB[4:0] = 11111,
V
IN
= 2.7V to 5.5V
l
788 800 812 mV
Default Feedback Regulation Voltage (V
FB
) DVBxA[4:0] = DVBxB[4:0] = 11001,
V
IN
= 2.7V to 5.5V
l
714 725 736 mV
Low Feedback Regulation Voltage (V
FB
) DVBxA[4:0] = DVBxB[4:0] = 00000,
V
IN
= 2.7V to 5.5V
l
404 412.5 421 mV
Feedback LSB Step Size 12.5 mV
Switching Frequency BUCKx[2] = 0
BUCKx[2] = 1
l
l
1.7
0.85
2.25
1.125
2.7
1.35
MHz
MHz
1.5A Step-Down Switching Regulators 1 and 2
PMOS Current Limit
l
2 A
PMOS On-Resistance (Note 7) 160 mΩ
NMOS On-Resistance (Note 7) 80 mΩ
2.5A Step-Down Switching Regulators 3 and 4
PMOS Current Limit
l
3.0 A
PMOS On-Resistance (Note 7) 120 mΩ
NMOS On-Resistance (Note 7) 70 mΩ
Step-Down Switching Regulator 1 and VTTR (LTC3676-1)
Buck 1 Feedback Regulation V
oltage VDDQIN = 1.5V
l
VTTR – 10 VTTR VTTR + 10 mV
VTTR Output Voltage VDDQIN = 1.5V
l
0.49•VDDQIN 0.5•VDDQIN 0.51•VDDQIN mV
VTTR Maximum Output Current
l
–10 10 mA
I
VIN
VTTR Enabled 1 mA
LDO Regulators 2, 3 and 4
Feedback Reference Soft-Start Rate 10 V/ms
Output Pull-Down Resistance Regulator Disabled 625 Ω
LDO Regulator 1
Output Voltage Range V
FB_L1
V
IN
Feedback Regulation Voltage (V
FB_L1
)
l
689 725 761 mV
Line Regulation I
LDO1
= 1mA, V
LDO1
= 1.2V,
V
IN
= 2.7V to 5.5V
0.15 %/V
Load Regulation I
LDO1
= 0.1mA to 25mA,
V
LDO1
= 3.3V
0.1 %