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PDF LTC3788 Data sheet ( Hoja de datos )
| Número de pieza | LTC3788 | |
| Descripción | Dual Output Synchronous Boost Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3788
2-Phase, Dual Output
Synchronous Boost Controller
FEATURES
DESCRIPTION
n Synchronous Operation for Highest Efficiency and
Reduced Heat Dissipation
n Wide Input Range: 4.5V to 38V (40V Abs Max) and
Operates Down to 2.5V After Start-Up
n Output Voltages Up to 60V
n ±1% 1.2V Reference Voltage
n RSENSE or Inductor DCR Current Sensing
n 100% Duty Cycle Capability for Synchronous MOSFET
n Low Quiescent Current: 125μA
n Phase-Lockable Frequency (75kHz to 850kHz)
n Programmable Fixed Frequency (50kHz to 900kHz)
n Selectable Current Limit
n Adjustable Output Voltage Soft-Start
n Power Good Output Voltage Monitors
n Low Shutdown Current IQ: < 8μA
n Internal LDO Powers Gate Drive from VBIAS or EXTVCC
n Thermally Enhanced Low Profile 32-Pin 5mm × 5mm
QFN Package
APPLICATIONS
n Industrial
n Automotive
n Medical
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The LTC®3788 is a high performance 2-phase dual
synchronous boost converter controller that drives all
N-channel power MOSFETs. Synchronous rectification
increases efficiency, reduces power losses and eases
thermal requirements, allowing the LTC3788 to be used
in high power boost applications.
A constant-frequency current mode architecture allows a
phase-lockable frequency of up to 850kHz. OPTI-LOOP®
compensation allows the transient response to be optimized
over a wide range of output capacitance and ESR values.
The LTC3788 features a precision 1.2V reference and dual
power good output indicators. A 4.5V to 38V input supply
range encompasses a wide range of system architectures
and battery chemistries.
Independent SS pins for each controller ramp the output
voltages during start-up. The PLLIN/MODE pin selects
among Burst Mode operation, pulse-skipping mode or
continuous inductor current mode at light loads.
For a leaded 28-lead SSOP package with a fixed current
limit and one PGOOD output, without phase modulation
or a clock output, see the LTC3788-1 data sheet.
L, LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP, PolyPhase and the Linear logo
are registered trademarks and No RSENSE and ThinSOT are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by
U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.
TYPICAL APPLICATION
VIN 4.5V TO 12V START-UP VOLTAGE
OPERATES THROUGH TRANSIENTS DOWN TO 2.5V
VIN
VOUT
12V AT 5A
3mΩ
1.25μH
110k
220μF
12.1k
4.7μF
4.7μF
4mΩ
220μF
TG1 VBIAS INTVCC TG2
0.1μF
BOOST1
BOOST2
SW1 SW2
LTC3788
BG1 BG2
0.1μF
SENSE1+
SENSE1–
SENSE2+
SENSE2–
RUN1
PGND
15nF
2.7k
VFB1
RUN2
PGOOD1
VFB2
FREQ
EXTVCC
PLLIN/MODE
ITH1 SS1 SGND SS2 ITH2
100pF
0.1μF
0.1μF
220pF
3.3μH
VOUT
24V AT 3A
232k
15nF
8.66k 12.1k
3788 TA01a
220μF
Efficiency and Power Loss
vs Output Current
100 10000
90
80 1000
70
60 100
50
40 10
30
20
10
0
0.00001 0.0001 0.001
VIN = 12V
1
VOUT = 24V
Burst Mode OPERATION
FIGURE 9 CIRCUIT
0.1
0.01 0.1 1 10
OUTPUT CURRENT (A)
3788 TA01b
3788f
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3788
Efficiency and Power Loss
vs Output Current
100
10000
90
80 1000
70
60 100
50
40 10
30
20
10
0
0.01
VIN = 12V
1
VOUT = 24V
FIGURE 9 CIRCUIT
0.1
0.1 1 10
OUTPUT CURRENT (A)
BURST EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
CCM EFFICIENCY
3788 G01
BURST LOSS
PULSE-SKIPPING
LOSS
CCM LOSS
Efficiency vs Input Voltage
100
ILOAD = 2A
99 FIGURE 9 CIRCUIT
98
97 VOUT = 12V
96
VOUT = 24V
95
94
93
www.DataSheet4U.com 92
91
90
0
5 10 15 20
INPUT VOLTAGE (V)
25
3788 G03
Load Step
Burst Mode Operation
Efficiency and Power Loss
vs Output Current
100
10000
90
80 1000
70
60 100
50
40 10
30
20
10
0
0.00001 0.0001 0.001
VIN = 12V
1
VOUT = 24V
Burst Mode OPERATION
FIGURE 9 CIRCUIT
0.1
0.01 0.1 1 10
OUTPUT CURRENT (A)
BURST EFFICIENCY
BURST LOSS
3788 G02
Load Step
Forced Continuous Mode
LOAD STEP
2A/DIV
INDUCTOR
CURRENT
5A/DIV
VOUT
500mV/DIV
VIN = 12V
200μs/DIV
VOUT = 24V
FIGURE 9 CIRCUIT
Load Step
Pulse-Skipping Mode
3788 G04
LOAD STEP
2A/DIV
INDUCTOR
CURRENT
5A/DIV
VOUT
500mV/DIV
LOAD STEP
2A/DIV
INDUCTOR
CURRENT
5A/DIV
VOUT
500mV/DIV
VIN = 12V
200μs/DIV
VOUT = 24V
FIGURE 9 CIRCUIT
3788 G05
VIN = 12V
200μs/DIV
VOUT = 24V
FIGURE 9 CIRCUIT
3788 G06
3788f
5
5 Page 
BLOCK DIAGRAM
LTC3788
PHASMD
CLKOUT
FREQ
20μA
CLK2
VCO CLK1
PFD
PLLIN/
MODE
100k
ILIM
VBIAS
SYNC
DET
CURRENT
LIMIT
EXTVCC
5.4V
LDO
EN
www.DataSheet4U.com
+
4.8V –
5.4V
LDO
EN
INTVCC
SHDN
–+
3.8V
SGND
DUPLICATE FOR SECOND CONTROLLER CHANNEL
S
RQ
SHDN
SWITCHING
LOGIC
AND
CHARGE
PUMP
BOOST
TG
SW
INTVCC
BG
INTVCC
DB
CB
0.425V +
–
SLEEP
PGND
–
+ –+
2.8V
0.7V
SLOPE COMP
+
+– –
2mV
SENSE –
SENSE+
L
RSENSE
SENS LO
+
– 2.5V
+
EA – 1.2V
– SS
VFB
0.5μA/
4.5μA
11V
SHDN
RUN
SENS
LO
+
OV
–
1.32V
ITH
10μA 1.32V +
–
VFB
+
1.08V –
SS
PGOOD
CC
CC2
VOUT
COUT
VIN
CIN
RC
CSS
3788 BD
3788f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3788.PDF ] | |
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