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Linear Technology Electronic Components Datasheet

LTC3890-2 Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

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LTC3890-2
FEATURES
n Wide VIN Range: 4V to 60V (65V Abs Max)
n Low Operating IQ: 50μA (One Channel On)
n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
n RSENSE 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 IQ : < 14μA
n Internal LDO Powers Gate Drive from VIN or EXTVCC
n Small Low Profile (0.75mm) 5mm × 5mm QFN Package
APPLICATIONS
n Automotive Always-On Systems
n Battery Operated Digital Devices
n Distributed DC Power Systems
60V Low IQ, Dual, 2-Phase
Synchronous Step-Down
DC/DC Controller
DESCRIPTION
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 50μA 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.
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.
TYPICAL APPLICATION
VOUT1
3.3V
5A
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter
4.7μH
0.1μF
VIN
TG1
BOOST1
SW1
INTVCC
TG2
BOOST2
SW2
4.7μF
VIN
9V TO 60V
22μF
0.1μF
8μH
BG1 BG2
LTC3890-2
PGND
SENSE1+
SENSE2+
0.008Ω
100k
470μF
31.6k
1000pF
SENSE1
VFB1
ITH1
SENSE2
VFB2
ITH2
TRACK/SS1 SGND TRACK/SS2
34.8k 0.1μF
0.1μF
1000pF
34.8k
0.01Ω
100k
10.5k
VOUT2
8.5V
3A
330μF
38902 TA01a
Efficiency and Power Loss
vs Output Current
100
VIN = 12V
90 VOUT = 3.3V
80
10000
1000
70
60 100
50
40 10
30
20 1
10
0
0.0001
0.001 0.01 0.1
1
OUTPUT CURRENT (A)
0.1
10
38902 TA01b
38902f
1


Linear Technology Electronic Components Datasheet

LTC3890-2 Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

No Preview Available !

LTC3890-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN)......................... –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
SENSE2Voltages ..................................... –0.3V to 28V
PLLIN/MODE, INTVCC Voltage ..................... –0.3V to 6V
FREQ Voltage ........................................ –0.3V to INTVCC
ILIM, PHASMD Voltages ....................... –0.3V to INTVCC
EXTVCC ..................................................... –0.3V to 14V
ITH1, ITH2, VFB1, VFB2 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
PIN CONFIGURATION
TOP VIEW
32 31 30 29 28 27 26 25
SENSE11
24 BOOST1
FREQ 2
23 BG1
PHASMD 3
CLKOUT 4
PLLIN/MODE 5
SGND 6
RUN1 7
33
SGND
22 VIN
21 PGND
20 EXTVCC
19 INTVCC
18 BG2
RUN2 8
17 BOOST2
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 150°C, θJA = 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/
38902f
2


Part Number LTC3890-2
Description 2-Phase Synchronous Step-Down DC/DC Controller
Maker Linear Technology
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LTC3890-2 Datasheet PDF






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