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PDF LTC3829 Data sheet ( Hoja de datos )
| Número de pieza | LTC3829 | |
| Descripción | Single Output Synchronous Step-Down DC/DC Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3829www.DataSheet4U.com
3-Phase, Single Output
Synchronous Step-Down
DC/DC Controller with Diffamp
Features
Description
n Optional Nonlinear Control for Fast Response
n ±0.75%, 0.6V Reference Accuracy
n PWM, Stage Shedding™ or Burst Mode® Operation
n High Efficiency: Up to 95%
n RSENSE or DCR Current Sensing
n Programmable DCR Temperature Compensation
n Phase-Lockable Fixed Frequency: 250kHz to 770kHz
n True Remote Sense Differential Amplifier
n Programmable Active Voltage Positioning (AVP)
n Triple N-Channel MOSFET Synchronous Drive
n Wide VIN Range: 4.5V to 38V Operation
n VOUT Range: 0.6V to 5V without Diffamp
n VOUT Range: 0.6V to 3.3V with Diffamp
n Clock Input and Output for 6-Phase Operation
n Adjustable Soft-Start or VOUT Tracking
n 38-Pin (5mm × 7mm) QFN and FE Packages
Applications
n Notebook and Palmtop Computers
n Telecom Systems
n Portable Instruments
n DC Power Distribution Systems
The LTC®3829 is a high performance 3-phase single output
synchronous step-down DC/DC switching controller that
drives all N‑channel synchronous power MOSFET stages.
A constant frequency current mode architecture allows a
phase-lockable frequency of up to 770kHz. Power loss and
noise due to ESR of the input capacitors are minimized by
operating the three controller output stages out of phase.
The LTC3829 can be configured for 6-phase operation,
has DCR temperature compensation, and output foldback
current limiting. This device features a precision 0.6V
reference and a power good indicator.
Light load efficiency is optimized by using a choice of
output Stage Shedding or Burst Mode operation. A dif-
ferential amplifier provides true remote sensing of the
output voltage at the point of load.
The LTC3829 is available in both low profile 38-pin 5mm
× 7mm QFN and Exposed Pad FE packages.
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, PolyPhase, Linear Technology, the Linear logo are
registered trademarks and Stage Shedding, No RSENSE are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by
U.S. Patents, including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 6498466,
6674274, 6611136.
Typical Application
4.7µF
INTVCC
BOOST1
BOOST2
BOOST3
VIN TG1
SW1
BG1
PGND
SSEENNSSEE11+–
SW3 SW2 SW1
680pF
100k
FREQ
LTC3829
TG2
SW2
BG2
ITH
5k 0.1µF
TK/SS
SGND
SENSE2+
SENSE2–
DIFFOUT
TG3
20k
VFB
SW3
BG3
20k
DIFFN
DIFFP
SSEENNSSEE33+–
0.6µH 0.002Ω
+
VIN
22µF 6V TO 28V
35V
s3
VIN
0.6µH 0.002Ω
VIN
0.6µH 0.002Ω
VOUT
1.2V
50A
+
COUT
470µF
4V
s4
3829 TA01
Efficiency
100
95
VVIONU=T
12V
= 1.5V
90
85 EFFICIENCY
80
75
70
65
POWER LOSS
60
55
50
0.1
1 10
LOAD CURRENT (A)
16
14
12
10
8
6
4
2
0
100
3829 TA01b
3829f
1 page  
LTC3829www.DataSheet4U.com
E lectrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN = 5V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Nonlinear Fast Transit Mode
IFAST Fast Transient Programmable Current VIFAST = 400mV
AVP (Active Voltage Positioning)
9 10 11
ISINK Sink Current of AVP Pin
ISOURCE
Source Current of AVP Pin
VAVP-VO(MAX) Maximum Voltage Drop VAVP to VO
VAVP Maximum AVP Voltage
On-Chip Driver
SENSE+ = 1.2V
SENSE+ = 1.2V
SENSE+ = 1.2V
l 2.5
250
2
180
TG RUP
TG RDOWN
BG RUP
BG RDOWN
TG Pull-Up RDS(ON)
TG Pull-Down RDS(ON)
BG Pull-Up RDS(ON)
BG Pull-Down RDS(ON)
TG High
TG Low
BG High
BG Low
2.6
1.5
4
1.1
UNITS
µA
µA
mA
mV
V
Ω
Ω
Ω
Ω
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3829E is guaranteed to meet performance specifications
from 0°C to 85°C operating junction temperature. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC3829I is guaranteed to meet performance specifications over the
full –40°C to 125°C operating junction temperature range.
Note 3: TJ is calculated from the ambient temperature, TA, and power
dissipation, PD, according to the following formula:
LTC3829UHF: TJ = TA + (PD • 34°C/W)
LTC3829FE: TJ = TA + (PD • 25°C/W)
Note 4: The LTC3829 is tested in a feedback loop that servos VITH to a
specified voltage and measures the resultant VFB.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition corresponds to the on inductor
peak-to-peak ripple current ≥40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 8: Guaranteed by design.
3829f
5 Page 
LTC3829www.DataSheet4U.com
FUNCTIONAL Diagram
FREQ
MODE
PLLIN
PLL-SYNC
MODE/SYNC
DETECT
ITEMP
TEMPSNS
0.6V
–+
F
EXTVCC
4.7V
–+
F
5V
REG
CLKOUT
IFAST
ILIM
OSC
+
ICOMP
–
3k
S
RQ
–
+ IREV
IFAST
FCNT
ON
BURSTEN
SWITCH
LOGIC
AND
ANTISHOOT-
THROUGH
RUN
OV
SLOPE
COMPENSATION
INTVCC
UVLO
1
51k
ITHB
SLOPE RECOVERY
ACTIVE CLAMP
SLEEP
SHED
COMP
ISET
VIN
ISET
SS RUN
0.6V EA
REF 0.5V 1.22V
1.25µA
0.55V
ISET
ISET
ITH RC CC1
RUN TK/SS CSS
+
UV
–
+
OV
–
VIN
INTVCC
BOOST
+
CIN
VIN
INTVCC
TG CB
SW
SENSE+
SENSE–
DB
BG
PGND
CVCC
M1
L1
M2
VOUT
+
COUT
PGOOD
0.54V
VFB
DIFFOUT
R2
+
DIFFAMP
–
40k
40k
RAVP
DIFFP
R1 40k 40k DIFFN
0.66V
SGND
RPRE-AVP
AVP
1.0µA
+++–––
SENSE1+
SSEENNSSEE12–+
SSEENNSSEE23–+
SENSE3–
3829 BD
3829f
11
11 Page | ||
| Páginas | Total 40 Páginas | |
| PDF Descargar | [ Datasheet LTC3829.PDF ] | |
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