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LTC3890EGN-1 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3890EGN-1
Description  60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
Download  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3890EGN-1 Datasheet(HTML) 1 Page - Linear Technology

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LTC3890-1
1
38901f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
60V Low IQ,
Dual, 2-Phase Synchronous
Step-Down DC/DC Controller
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter
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
n Automotive Always-On Systems
n Battery Operated Digital Devices
n Distributed DC Power Systems
0.1μF
100k
4.7μH
1000pF
470μF
4.7μF
22μF
0.008Ω
31.6k
34.8k
VOUT1
3.3V
5A
330μF
0.1μF
100k
8μH
1000pF
0.01Ω
10.5k
34.8k
VOUT2
8.5V
3A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
SGND
PGND
SENSE1+
SENSE2+
SENSE1
SENSE2
VFB1
VFB2
ITH1
ITH2
VIN
INTVCC
TRACK/SS1
TRACK/SS2
VIN
9V TO 60V
38901 TA01
0.1μF
0.1μF
LTC3890-1
Efficiency and Power Loss
vs Output Current (Buck)
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-lock-
able 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.
OUTPUT CURRENT (A)
0
70
100
1
0.1
0.01
0.001
0.0001
10
38901 TA01b
50
40
30
20
1
10
100
1000
10000
0.1
10
60
80
90
VIN = 12V
VOUT = 3.3V


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