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LTC3890HUH-2#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P40
LTC3890-2
1
38902f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
60V Low I
Q
, Dual, 2-Phase
Synchronous Step-Down
DC/DC Controller
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter
n
Wide V
IN
Range: 4V to 60V (65V Abs Max)
n
Low Operating I
Q
: 50μA (One Channel On)
n
Wide Output Voltage Range: 0.8V ≤ V
OUT
≤ 24V
n
R
SENSE
or DCR Current Sensing
n
Out-of-Phase Controllers Reduce Input Capacitance
and Power Supply Induced Noise
n
Phase-Lockable Frequency (75kHz to 850kHz)
n
Programmable Fixed Frequency (50kHz to 900kHz)
n
Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode
®
Operation at Light Loads
n
Selectable Current Limit
n
Very Low Dropout Operation: 99% Duty Cycle
n
Adjustable Output Voltage Soft-Start or Tracking
n
Power Good Output Voltage Monitors
n
Low Shutdown I
Q
: < 14µA
n
Internal LDO Powers Gate Drive from V
IN
or EXTV
CC
n
Small Low Profile (0.75mm) 5mm × 5mm QFN Package
n
Automotive Always-On Systems
n
Battery Operated Digital Devices
n
Distributed DC Power Systems
Efficiency and Power Loss
vs Output Current
The LTC
®
3890-2 is a high performance dual step-down
switching regulator DC/DC controller that drives all
N-channel synchronous power MOSFET stages. A constant
frequency current mode architecture allows a phase-
lockable frequency of up to 850kHz. Power loss and noise
due to the ESR of the input capacitor are minimized by
operating the two controller output stages out-of-phase.
The 50A no-load quiescent current extends operating run
time in battery-powered systems. OPTI-LOOP
®
compensa-
tion allows the transient response to be optimized over a
wide range of output capacitance and ESR values. A wide
4V to 60V input supply range encompasses a wide range
of intermediate bus voltages and battery chemistries.
Independent TRACK/SS pins for each controller ramp the
output voltages during start-up. Current mode control limits
the inductor current during short-circuit conditions. The
PLLIN/MODE pin selects among Burst Mode operation,
pulse-skipping mode, or continuous conduction mode at
light loads. For versions with different and/or additional
features, see the LTC3890 family summary, Table 1, in the
Pin Functions section of this data sheet.
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
POWER LOSS (mW)
70
100
10.10.010.0010.0001 10
38902 TA01b
50
40
30
20 1
10
100
1000
10000
0.1
10
60
80
90
V
IN
= 12V
V
OUT
= 3.3V
0.1µF
100k
4.7µH
1000pF
470µF
22µF
0.008Ω
31.6k
34.8k
V
OUT1
3.3V
5A
330µF
0.1µF
4.7µF
100k
8µH
1000pF
0.01Ω
10.5k
34.8k
V
OUT2
8.5V
3A
TG1 TG2
BOOST1 BOOST2
SW1 SW2
BG1 BG2
SGND
PGND
SENSE1
+
SENSE2
+
SENSE1
–
SENSE2
–
V
FB1
V
FB2
ITH1 ITH2
V
IN
INTV
CC
TRACK/SS1 TRACK/SS2
V
IN
9V TO 60V
38902 TA01a
0.1µF
0.1µF
LTC3890-2
L, LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP, PolyPhase and the Linear logo
are registered trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 5481178, 5705919,
5929620, 6100678, 6144194, 6177787, 6304066, 6580258, 7230497.
LTC3890-2
2
38902f
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
(Note 1)
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1
TOP VIEW
SENSE1
–
FREQ
PHASMD
CLKOUT
PLLIN/MODE
SGND
RUN1
RUN2
BOOST1
BG1
V
IN
PGND
EXTV
CC
INTV
CC
BG2
BOOST2
SENSE1
+
V
FB1
ITH1
TRACK/SS1
I
LIM
PGOOD1
TG1
SW1
SENSE2
–
SENSE2
+
V
FB2
ITH2
TRACK/SS2
PGOOD2
TG2
SW2
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
33
SGND
T
JMAX
= 150°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3890EUH-2#PBF LTC3890EUH-2#TRPBF 38902
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3890IUH-2#PBF LTC3890IUH-2#TRPBF 38902
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3890HUH-2#PBF LTC3890HUH-2#TRPBF 38902
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 150°C
LTC3890MPUH-2#PBF LTC3890MPUH-2#TRPBF 38902
32-Lead (5mm × 5mm) Plastic QFN
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
Input Supply Voltage (V
IN
) ......................... –0.3V to 65V
Topside Driver Voltages
BOOST1, BOOST2 .................................–0.3V to 71V
Switch Voltage (SW1, SW2) ......................... –5V to 65V
(BOOST1-SW1), (BOOST2-SW2) ................ –0.3V to 6V
RUN1, RUN2 ............................................... –0.3V to 8V
Maximum Current Sourced into Pin from
Source > 8V .....................................................100µA
SENSE1
+
, SENSE2
+
, SENSE1
–
SENSE2
–
Voltages ..................................... –0.3V to 28V
PLLIN/MODE, INTV
CC
Voltage ..................... –0.3V to 6V
FREQ Voltage ........................................–0.3V to INTV
CC
I
LIM
, PHASMD Voltages .......................–0.3V to INTV
CC
EXTV
CC
..................................................... –0.3V to 14V
ITH1, ITH2, V
FB1
, V
FB2
Voltages ................... –0.3V to 6V
PGOOD1, PGOOD2 Voltages ....................... –0.3V to 6V
TRACK/SS1, TRACK/SS2 Voltages ............. –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC3890E-2, LTC3890I-2 ................... –40°C to 125°C
LTC3890H-2 ......................................–40°C to 150°C
LTC3890MP-2 .................................... –55°C to 150°C
Storage Temperature Range ..................–65°C to 150°C
LTC3890-2
3
38902f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Supply Operating Voltage Range 4 60 V
V
OUT
Regulated Output Voltage Range 0.8 24 V
V
FB1,2
Regulated Feedback Voltage (Note 4) I
TH1,2
Voltage = 1.2V
–40°C to 85°C, All Grades
LTC3890E-2, LTC3890I-2
LTC3890H-2, LTC3890MP-2
l
l
0.792
0.788
0.786
0.800
0.800
0.800
0.808
0.812
0.812
V
V
V
I
FB1,2
Feedback Current (Note 4) ±5 ±50 nA
V
REFLNREG
Reference Voltage Line Regulation (Note 4) V
IN
= 4.5V to 60V 0.002 0.02 %/V
V
LOADREG
Output Voltage Load Regulation (Note 4)
Measured in Servo Loop,
Δ
ITH
Voltage = 1.2V to 0.7V
l
0.01 0.1 %
(Note 4)
Measured in Servo Loop,
Δ
ITH
Voltage = 1.2V to 2V
l
–0.01 –0.1 %
g
m1,2
Transconductance Amplifier g
m
(Note 4) I
TH1,2
= 1.2V, Sink/Source = 5µA 2 mmho
I
Q
Input DC Supply Current (Note 5)
Pulse-Skipping or Forced Continuous
Mode (One Channel On)
RUN1 = 5V and RUN2 = 0V, V
FB1
= 0.83V or
RUN1 = 0V and RUN2 = 5V, V
FB2
= 0.83V
1.3 mA
Pulse-Skipping or Forced Continuous
Mode (Both Channels On)
RUN1,2 = 5V, V
FB1,2
= 0.83V (No Load) 2 mA
Sleep Mode (One Channel On) RUN1 = 5V and RUN2 = 0V, V
FB1
= 0.83V (No Load) or
RUN1 = 0V and RUN2 = 5V, V
FB2
= 0.83V (No Load)
50 75 µA
Sleep Mode (Both Channels On) RUN1,2 = 5V, V
FB1,2
= 0.83V (No Load) 60 100 µA
Shutdown RUN1,2 = 0V 14 25 µA
UVLO Undervoltage Lockout INTV
CC
Ramping Up
INTV
CC
Ramping Down
l
l
3.6
3.92
3.80
4.2
4.0
V
V
I
SENSE
+
SENSE
+
Pin Current Each Channel ±1 µA
I
SENSE
–
SENSE
–
Pins Current Each Channel
V
SENSE
–
< INTV
CC
– 0.5V
V
SENSE
–
> INTV
CC
+ 0.5V 700
±1 µA
µA
Maximum TG1,2 Duty Factor In Dropout 98 99 %
I
TRACK/SS1,2
Soft-Start Charge Current V
TRACK/SS1,2
= 0V 0.7 1.0 1.4 µA
V
RUN1
V
RUN2
RUN1 Pin On Threshold
RUN2 Pin On Threshold
V
RUN1
Rising
V
RUN2
Rising
l
l
1.15
1.20
1.21
1.25
1.27
1.30
V
V
RUN1,2 Pin Hysteresis 50 mV
V
SENSE(MAX)
Maximum Current Sense Threshold V
FB1,2
= 0.7V, V
SENSE1
–,
2
– = 3.3V, I
LIM
= 0
V
FB1,2
= 0.7V, V
SENSE1
–,
2
– = 3.3V, I
LIM
= INTV
CC
V
FB1,2
= 0.7V, V
SENSE1
–,
2
– = 3.3V, I
LIM
= FLOAT
l
l
l
22
43
64
30
50
75
36
57
85
mV
mV
mV
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
RUN1,2
= 5V, EXTV
CC
= 0V unless otherwise noted.
(Note 2)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P40

LTC3890HUH-2#TRPBF

Mfr. #:
Buy LTC3890HUH-2#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 60V Low IQ, Dual Output Synchronous Step-Down Controller
Lifecycle:
New from this manufacturer.
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