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Linear Technology Electronic Components Datasheet

LTC3890-1 Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

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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 Required 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 Very Low Dropout Operation: 99% Duty Cycle
n Adjustable Output Voltage Soft-Start or Tracking
n Power Good Output Voltage Monitor
n Output Overvoltage Protection
n Low Shutdown IQ: <14µA
n Internal LDO Powers Gate Drive from VIN or EXTVCC
n No Current Foldback During Start-Up
n Narrow SSOP Package
APPLICATIONS
n Automotive Always-On Systems
n Battery Operated Digital Devices
n Distributed DC Power Systems
LTC3890-1
60V Low IQ, Dual, 2-Phase
Synchronous Step-Down
DC/DC Controller
DESCRIPTION
The LTC®3890-1 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 supply
noise are minimized by operating the two controller output
stages out-of-phase.
The 50μA no-load quiescent current extends operating life
in battery-powered systems. OPTI-LOOP® compensation
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 foldback limits
MOSFET heat dissipation during short-circuit conditions.
The PLLIN/MODE pin selects among Burst Mode operation,
pulse-skipping mode, or continuous conduction mode at
light loads.
For a leadless 32-pin QFN package with additional features
of adjustable current limit, clock out, phase modulation
and two PGOOD outputs, see the LTC3890 data sheet.
L, LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP 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
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter
4.7µH
0.1µF
VIN
TG1
INTVCC
TG2
BOOST1
BOOST2
SW1 SW2
BG1 BG2
LTC3890-1 PGND
SENSE1+
SENSE2+
4.7µF
VIN
9V TO 60V
22µF
0.1µF
8µH
VOUT1
3.3V
5A
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
38901 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
38901 TA01b
38901fb
1


Linear Technology Electronic Components Datasheet

LTC3890-1 Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

No Preview Available !

LTC3890-1
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 Voltages.................... –0.3V to 6V
FREQ Voltage......................................... –0.3V to INTVCC
EXTVCC ...................................................... –0.3V to 14V
ITH1, ITH2, VFB1, VFB2 Voltages.................... –0.3V to 6V
PGOOD1 Voltage .......................................... –0.3V to 6V
TRACK/SS1, TRACK/SS2 Voltages .............. –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC3890E-1, LTC3890I-1.................... –40°C to 125°C
LTC3890H-1........................................ –40°C to 150°C
LTC3890MP-1..................................... –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
ITH1 1
VFB1
SENSE1+
SENSE1
2
3
4
FREQ 5
PLLIN/MODE 6
SGND 7
RUN1 8
RUN2
SENSE2
SENSE2+
9
10
11
VFB2 12
ITH2 13
TRACK/SS2 14
TOP VIEW
28 TRACK/SS1
27 PGOOD1
26 TG1
25 SW1
24 BOOST1
23 BG1
22 VIN
21 PGND
20 EXTVCC
19 INTVCC
18 BG2
17 BOOST2
16 SW2
15 TG2
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 150°C, θJA = 90°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3890EGN-1#PBF
LTC3890EGN-1#TRPBF
LTC3890GN-1
28-Lead Plastic SSOP
–40°C to 125°C
LTC3890IGN-1#PBF
LTC3890IGN-1#TRPBF
LTC3890GN-1
28-Lead Plastic SSOP
–40°C to 125°C
LTC3890HGN-1#PBF
LTC3890HGN-1#TRPBF
LTC3890GN-1
28-Lead Plastic SSOP
–40°C to 150°C
LTC3890MPGN-1#PBF LTC3890MPGN-1#TRPBF
LTC3890GN-1
28-Lead Plastic SSOP
–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/
38901fb
2


Part Number LTC3890-1
Description 2-Phase Synchronous Step-Down DC/DC Controller
Maker Linear
Total Page 30 Pages
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