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Linear Technology Electronic Components Datasheet

LTC1628 Datasheet

High Efficiency/ 2-Phase Synchronous Step-Down Switching Regulators

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LTC1628 pdf
LTC1628/LTC1628-PG
High Efficiency, 2-Phase
Synchronous Step-Down Switching Regulators
FEATURES
s Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
s OPTI-LOOPTM Compensation Minimizes COUT
s Dual N-Channel MOSFET Synchronous Drive
s ±1% Output Voltage Accuracy
s Power Good Output Voltage Monitor (LTC1628-PG)
s DC Programmed Fixed Frequency 150kHz to 300kHz
s Wide VIN Range: 3.5V to 36V Operation
s Very Low Dropout Operation: 99% Duty Cycle
s Adjustable Soft-Start Current Ramping
s Foldback Output Current Limiting
s Latched Short-Circuit Shutdown with Defeat Option
s Output Overvoltage Protection
s Remote Output Voltage Sense
s Low Shutdown IQ: 20µA
s 5V and 3.3V Standby Regulators
s Small 28-Lead SSOP Package
s Selectable Constant Frequency or Burst ModeTM
Operation
U
APPLICATIO S
s Notebook and Palmtop Computers, PDAs
s Battery Chargers
s Portable Instruments
s Battery-Operated Digital Devices
s DC Power Distribution Systems
DESCRIPTIO
The LTC®1628/LTC1628-PG are high performance dual
step-down switching regulator controllers that drive all
N-channel synchronous power MOSFET stages. A con-
stant frequency current mode architecture allows adjust-
ment of the frequency up to 300kHz. Power loss and noise
due to the ESR of the input capacitors are minimized by
operating the two controller output stages out of phase.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance and
ESR values. The precision 0.8V reference and power good
output indicator are compatible with future microproces-
sor generations, and a wide 3.5V to 30V (36V maximum)
input supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides both soft-start
and optional timed, short-circuit shutdown. Current
foldback limits MOSFET dissipation during short-circuit
conditions when overcurrent latchoff is disabled. Output
overvoltage protection circuitry latches on the bottom
MOSFET until VOUT returns to normal. The FCB mode pin
can select among Burst Mode, constant frequency mode
and continuous inductor current mode or regulate a
secondary winding. The LTC1628-PG includes a power
good output pin that replaces the FLTCPL, fault coupling
control pin of the LTC1628.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
L1
6.3µH
D1
VOUT1
5V
5A
RSENSE1
0.01
+
COUT1
47µF
6V
SP
R2
105k
1%
M1
M2
R1
20k
1%
+
4.7µF
CB1, 0.1µF
D3
VIN
TG1
INTVCC
TG2
BOOST1
BOOST2
SW1 SW2
LTC1628
BG1 BG2
1000pF
CC1
220pF
RC1
15k
SGND
SENSE1+
PGND
SENSE2+
SENSE1
VOSENSE1
ITH1
RUN/SS1
CSS1
0.1µF
SENSE2
VOSENSE2
ITH2
RUN/SS2
CSS2
0.1µF
1µF
D4 CERAMIC
CB2, 0.1µF
M3
M4
1000pF
CC2
220pF
RC2
15k
R3
20k
1%
VIN
CIN 5.2V TO 28V
22µF
50V
CERAMIC
L2
6.3µH
D2
R4
63.4k
1%
RSENSE2
0.01
VOUT2
3.3V
5A
COUT
56µF
6V
SP
+
M1, M2, M3, M4: FDS6680A
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
1628 F01
1


Linear Technology Electronic Components Datasheet

LTC1628 Datasheet

High Efficiency/ 2-Phase Synchronous Step-Down Switching Regulators

No Preview Available !

LTC1628 pdf
LTC1628/LTC1628-PG
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VIN).........................36V to – 0.3V
Top Side Driver Voltages
(BOOST1, BOOST2) ...................................42V to – 0.3V
Switch Voltage (SW1, SW2) .........................36V to – 5V
INTVCC, EXTVCC, RUN/SS1, RUN/SS2, (BOOST1-SW1),
(BOOST2-SW2), PGOOD .............................7V to – 0.3V
SENSE1+, SENSE2 +, SENSE1,
SENSE2 Voltages ........................ (1.1)INTVCC to – 0.3V
FREQSET, STBYMD, FCB,
FLTCPL Voltage ................................... INTVCC to – 0.3V
ITH1, ITH2, VOSENSE1, VOSENSE2 Voltages ... 2.7V to – 0.3V
Peak Output Current <10µs (TG1, TG2, BG1, BG2) ... 3A
INTVCC Peak Output Current ................................ 50mA
Operating Temperature Range
LTC1628C/LTC1628C-PG ........................ 0°C to 85°C
LTC1628I/LTC1628I-PG ..................... – 40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RUN/SS1
SENSE1+
SENSE1
1
2
3
VOSENSE1 4
FREQSET 5
STBYMD 6
FCB 7
ITH1 8
SGND 9
3.3VOUT 10
ITH2 11
VOSENSE2 12
SENSE213
SENSE2+ 14
28 FLTCPL
27 TG1
26 SW1
25 BOOST1
24 VIN
23 BG1
22 EXTVCC
21 INTVCC
20 PGND
19 BG2
18 BOOST2
17 SW2
16 TG2
15 RUN/SS2
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
*PGOOD ON THE LTC1628-PG
Consult factory for Military grade parts.
ORDER PART
NUMBER
LTC1628CG
LTC1628IG
LTC1628CG-PG
LTC1628IG-PG
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loops
VOSENSE1, 2
IVOSENSE1, 2
VREFLNREG
VLOADREG
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
gm1, 2
gmGBW1, 2
IQ
VFCB
IFCB
VBINHIBIT
Transconductance Amplifier gm
Transconductance Amplifier GBW
Input DC Supply Current
Normal Mode
Standby
Shutdown
Forced Continuous Threshold
Forced Continuous Pin Current
Burst Inhibit (Constant Frequency)
Threshold
(Note 3); ITH1, 2 Voltage = 1.2V
(Note 3)
VIN = 3.6V to 30V (Note 3)
(Note 3)
Measured in Servo Loop; ITH Voltage = 1.2V to 0.7V
Measured in Servo Loop; ITH Voltage = 1.2V to 2.0V
ITH1, 2 = 1.2V; Sink/Source 5uA; (Note 3)
ITH1, 2 = 1.2V; (Note 3)
(Note 4)
VIN = 15V; EXTVCC Tied to VOUT1; VOUT1 = 5V
VRUN/SS1, 2 = 0V, VSTBYMD > 2V
VRUN/SS1, 2 = 0V, VSTBYMD = Open;
VFCB = 0.85V
Measured at FCB pin
q 0.792
q
q
q 0.76
– 0.30
0.800
–5
0.002
0.1
– 0.1
1.3
3
350
125
20
0.800
– 0.18
4.3
0.808
– 50
0.02
0.5
– 0.5
35
0.84
– 0.1
4.8
V
nA
%/V
%
%
mmho
MHz
µA
µA
µA
V
µA
V
UVLO
VOVL
ISENSE
VSTBYMD MS
Undervoltage Lockout
Feedback Overvoltage Lockout
Sense Pins Total Source Current
Master Shutdown Threshold
VIN Ramping Down
Measured at VOSENSE1, 2
(Each Channel); VSENSE1, 2– = VSENSE1+, 2+ = 0V
VSTBYMD Ramping Down
q 3.5 4
q 0.84 0.86 0.88
– 85 – 60
0.4 0.6
V
V
µA
V
2


Part Number LTC1628
Description High Efficiency/ 2-Phase Synchronous Step-Down Switching Regulators
Maker Linear Technology
Total Page 30 Pages
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