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LTC3890MPUH-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
n AEC-Q100 Qualified for Automotive Applications
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.
All registered trademarks and 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
Document Feedback
For more information www.analog.com
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
Rev. A
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3890MPUH-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
AUTOMOTIVE PRODUCTS**
LTC3890EUH-2#WPBF LTC3890EUH-2#WTRPBF 38902
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3890IUH-2#WPBF
LTC3890IUH-2#WTRPBF 38902
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3890HUH-2#WPBF LTC3890HUH-2#WTRPBF 38902
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
**Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
these models.
Rev. A
2
For more information www.analog.com


Part Number LTC3890MPUH-2
Description 2-Phase Synchronous Step-Down DC/DC Controller
Maker Analog Devices
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