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LTC3891 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3891
Description  60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3891 Datasheet(HTML) 1 Page - Linear Technology

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LTC3890-2
1
38902f
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 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 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 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.
OUTPUT CURRENT (A)
0
70
100
1
0.1
0.01
0.001
0.0001
10
38902 TA01b
50
40
30
20
1
10
100
1000
10000
0.1
10
60
80
90
VIN = 12V
VOUT = 3.3V
0.1μF
100k
4.7μH
1000pF
470μF
22μF
0.008Ω
31.6k
34.8k
VOUT1
3.3V
5A
330μF
0.1μF
4.7μF
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
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.


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