ltc3890 Linear Technology Corporation, ltc3890 Datasheet
ltc3890
Manufacturer Part Number
ltc3890
Description
60v Low Iq, Dual, 2-phase Synchronous Step-down Dc/dc Controller
Manufacturer
Linear Technology Corporation
Datasheet
1.LTC3890.pdf
(36 pages)
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LINEAR/凌特
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FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
V
OUT1
3.3V
5A
Wide V
Low Operating I
Wide Output Voltage Range: 0.8V ≤ V
R
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
Phase-Lockable Frequency (75kHz to 850kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Selectable Continuous, Pulse Skipping or Low Ripple
Burst Mode
Selectable Current Limit
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Power Good Output Voltage Monitors
Output Overvoltage Protection
Low Shutdown I
Internal LDO Powers Gate Drive from V
No Current Foldback During Start-up
Small Low Profi le (0.75mm) 5mm × 5mm QFN Package
Automotive Always-On Systems
Battery Operated Digital Devices
Distributed DC Power Systems
SENSE
High Effi ciency Dual 8.5V/3.3V Output Step-Down Converter
0.008Ω
470μF
4.7μH
100k
IN
or DCR Current Sensing
Range: 4V to 60V (65V Abs Max)
31.6k
®
Operation at Light Loads
0.1μF
Q
Q
34.8k
1000pF
: 50μA (One Channel On)
: < 14μA
0.1μF
TG1
BOOST1
SW1
BG1
SENSE1
SENSE1
V
ITH1
TRACK/SS1
FB1
V
IN
+
–
LTC3890
SGND
INTV
TRACK/SS2
SENSE2
SENSE2
BOOST2
CC
PGND
SW2
ITH2
V
BG2
TG2
FB2
0.1μF
+
–
OUT
IN
or EXTV
≤ 24V
34.8k
1000pF
0.1μF
4.7μF
CC
Step-Down DC/DC Controller
10.5k
8μH
100k
0.01Ω
22μF
Dual, 2-Phase Synchronous
DESCRIPTION
The LTC
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 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
tion allows the transient response to be optimized over
a wide range of output capacitance and ESR values. The
LTC3890 features a precision 0.8V reference and power
good output indicators. 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 leaded package version (28-lead Narrow
SSOP), see the LTC3890-1 data sheet.
L, LT, LTC, LTM, Burst Mode and OPTI-LOOP 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.
V
9V TO 60V
3890 TA01
IN
330μF
V
8.5V
3A
OUT2
®
3890 is a high performance dual step-down
100
90
80
70
60
50
40
30
20
10
0.0001
0
Effi ciency and Power Loss vs
V
V
IN
OUT
Output Current (Buck)
= 12V
= 3.3V
0.001
OUTPUT CURRENT (A)
0.01
60V Low I
0.1
1
LTC3890
3890 TA01b
10
®
10000
1000
100
10
1
0.1
compensa-
Q
1
3890f
,
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