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LTC3802EUH#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC3802
1
3802f
■
Wide V
IN
Range: 3V to 30V Operation with Line
Feedforward Compensation
■
Leading Edge Modulation Architecture for
Extremely Low Duty Cycle Operation
■
Phase-Lockable Fixed Frequency: 330kHz to 750kHz
■
Two 180° Out-of-Phase Controllers
■
Fast Programmable Power-Up/-Down Tracking
■
Programmable Current Limit Without External
Current Sense Resistor
■
Optional Burst Mode
®
Operation at Light Load
■
±1% 0.6V Voltage Reference
■
External N-Channel MOSFET Architecture
■
Low Shutdown Current: <100µA
■
Overvoltage Protection and PGOOD Flag
■
Small 28-Lead SSOP and 32-Lead QFN Packages
Dual 550kHz Synchronous
2-Phase DC/DC Controller with
Programmable Up/Down Tracking
■
Notebook and Palmtop Computers
■
Portable Instruments
■
Battery-Operated Digital Devices
■
DC Power Distribution Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
U.S. Patent Nos 5481178, 5846544, 6304066, 6580258, 5055767, 6307356
The LTC
®
3802 is a dual switching regulator controller
optimized for high efficiency step-down conversion from
input voltages between 3V to 30V. The controller uses a
leading edge modulation scheme to allow extremely low
duty cycle operation. The constant frequency voltage mode
controller allows a phase-lockable frequency between
330kHz and 750kHz. Power loss and noise due to the ESR
of the input capacitors are minimized by operating the two
controller output stages 180° out of phase. The synchro-
nous buck architecture automatically shifts to Burst Mode
operation as the output load decreases, ensuring maxi-
mum efficiency over a wide range of load currents.
The LTC3802 features an onboard, trimmed 0.6V refer-
ence and provides better than 1% regulation at the con-
verter outputs. A separate output sense provides real time
overvoltage protection and PGOOD sensing. An FBT pin
programs the power-up/-down tracking between the two
channels to meet various sequencing requirements. A
RUN/SS pin provides soft-start and externally program-
mable current limit protection functions.
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
TG2
BOOST2
SW2
BG2
PLLIN
PLLLPF
I
MAX2
CMPIN2
V
CC
COMP2
FB2
PHASEMD
PGOOD
V
INFF
+
+
PV
CC
0.1µF
0.1µF
10µF
CMDSH-3
Si7860DP
×2
Si7860DP
×2
4.7µF
25V
×8
Si7440DP
×2
5V
CMDSH-3
2200pF
1500pF
560pF
330pF
15k
47k47k
10k
5V
10Ω
390Ω15k
5V
390Ω
TG1
BOOST1
SW1
BG1
PGND
I
MAX1
FBT
CMPIN1
COMP1
FB1
SGND
FCB
RUN/SS
0.1µF
B340B
B340B
1µH
+
330µF
4V
×3
56µF
25V
×2
V
OUT1
3.3V
15A
V
IN
5V TO 22V
10k
10k
2.21k2.21k
0.47µF
V
IN
Si7440DP
×2
1µH
330µF
4V
×3
10k
10k
V
OUT2
2.5V
15A
3802 TA01
3.16k 3.16k
+
10µF
330pF
560pF
1500pF2200pF
0.1µF
LTC3802
+
LTC3802
2
3802f
ABSOLUTE AXI U RATI GS
W
WW
U
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
PACKAGE/ORDER I FOR ATIO
UUW
ORDER PART
NUMBER
LTC3802EGN
T
JMAX
= 125°C, θ
JA
= 110°C/W
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS GND
MUST BE SOLDERED TO PCB
Supply Voltage
V
CC
, PV
CC
............................................................. 7V
BOOST
n
.............................................................. 37V
BOOST
n
– SW
n
.................................................... 7V
SW
n
........................................................ –1V to 30V
Input Voltage
V
INFF
.................................................................... 30V
FB
n
, CMPIN
n
, FBT, PLLIN, FCB,
RUN/SS, PGOOD, PLLLPF, PHASEMD,
EXTREF, I
MAX
n
.......................... –0.3V to V
CC
+ 0.3V
Extended Commercial
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range
LTC3802EGN ................................... –65°C to 150°C
LTC3802EUH ................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
LTC3802EGN Only........................................... 300°C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PV
CC
BG1
BOOST1
TG1
SW1
PGND
I
MAX1
FBT
CMPIN1
COMP1
FB1
SGND
FCB
RUN/SS
BG2
BOOST2
TG2
SW2
PLLIN
PLLLPF
I
MAX2
CMPIN2
V
CC
COMP2
FB2
PHASEMD
V
INFF
PGOOD
UH PART
MARKING
LTC3802EUH
ORDER PART
NUMBER
3802
32 31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
33
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1SW1
PGND
PGND
I
MAX1
FBT
CMPIN1
COMP1
FB1
PGND
PGND
PLLIN
PLLLPF
I
MAX2
CMPIN2
V
CC
COMP2
TG1
BOOST1
BG1
PV
CC
BG2
BOOST2
TG2
SW2
SGND
FCB
EXTREF
RUN/SS
PGOOD
V
INFF
PHASEMD
FB2
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range. (Note 3) V
CC
= PV
CC
= BOOST = 5V, unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
V
CC
Supply Voltage ● 356 V
PV
CC
PV
CC
Supply Voltage (Note 4) ● 56 V
BV
CC
BOOST Pin Voltage V
BOOST
– V
SW
(Note 4) ● 56 V
V
UVLO
Positive Undervoltage Lockout Measured at V
CC
2.2 2.5 2.8 V
Measured at V
INFF
2.2 2.5 2.8 V
I
VCC
V
CC
Supply Current V
FB
= V
COMP
● 6.5 9 mA
V
RUN/SS
= 0V, PLLIN Floating ● 100 150 µA
LTC3802
3
3802f
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range. (Note 3) V
CC
= PV
CC
= BOOST = 5V, unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
PVCC
PV
CC
Supply Current V
FB
= V
CMPIN
= 0V, No Load 2 mA
V
RUN/SS
= 0V (Notes 5, 6) 1 10 µA
I
BOOST
BOOST Pin Current V
FB
= V
CMPIN
= 0V, No Load 1 mA
V
RUN/SS
= 0V (Notes 5, 6) 1 10 µA
Switcher Control Loop
V
FB
Feedback Voltage V
EXTREF
= 5V, 0°C ≤ T ≤ 70°C 0.594 0.600 0.606 V
V
EXTREF
= 5V ● 0.591 0.600 0.609 V
∆V
FB
Feedback Voltage V
CC
Line Regulation V
CC
= 4.5V to 6V ±0.01 %/V
∆V
OUT
Output Voltage Load Regulation (Note 7) 0.1 ±0.2 %
A
ERR
Error AMP DC Gain No Load, V
EXTREF
= V
RUN/SS
= V
CC
● 70 80 dB
GBW Error AMP Gain Bandwidth Product f = 100kHz (Note 7) 10 MHz
I
COMP
Error AMP Output Sink/Source Current V
RUN/SS
= V
CC
±12 mA
I
FB
Voltage Feedback Input Current V
FB
= 0V to 1V ● ±1 µA
I
CMPIN
Comparators Input Current V
CMPIN
= 0V to 1V ● ±1 µA
I
FBT
FBT Input Current V
FBT
= 0V to 1V ● ±1 µA
I
EXTREF
EXTREF Input Current V
EXTREF
= 0V to 5V ● ±1 µA
V
EXTREF
External Reference Not to Affect V
FB
● 1V
A
LFF
∆ Drop in Duty Cycle/∆ V
INFF
V
VINFF
= 5V to 30V 2.3 %/V
R
VINFF
V
INFF
Input Resistance 1MΩ
V
PGOOD
Positive Power Good Threshold With Respect to 0.6V ● 5 10 15 %
Negative Power Good Threshold With Respect to 0.6V
● –5 –10 –15 %
V
OVP
Overvoltage Threshold With Respect to V
FB
359 %
V
BURRS
(V
CMPIN
– V
FB
) to Reset 15 mV
Burst Mode Operation –12 mV
V
SAW
SAW Before Line Compensation 1.2 V
I
IMAX
I
MAX
Source Current V
IMAX
= 1V –9.0 –10 –11.0 µA
● –8.5 –10 –11.5 µA
I
LIM(TH)
I
LIM
Comparator Offset ● –15 0 15 mV
V
IMAX
/I
LIM
Threshold 5V/V
Hard I
LIM
/I
LIM
Threshold V
CMPIN
= 0V 1.5 V/V
I
SS
RUN/SS Source Current V
CMPIN
= V
FBT
= 0.6V, V
PHASEMD
= V
CC
–5 –7 –9 µA
RUN/SS Sink/Source Current Ratio V
CMPIN
= V
FBT
= 0.6V, V
PHASEMD
= 0V 1.5 2 2.5 µA/µA
RUN/SS Sink Current, I
LIM
V
CMPIN
= V
FBT
= 0.6V 100 µA
RUN/SS Sink Current, Hard I
LIM
V
CMPIN
= V
FBT
= 0V ● 1mA
V
SHDN
RUN/SS Shutdown Threshold RUN/SS↑ ● 0.4 0.8 1.2 V
LOGIC and PGOOD
I
PHASEMD
PHASEMD Pull-Up Current V
PHASEMD
= 0V –7 µA
PHASEMD Pull-Down Current V
PHASEMD
= 5V 2 µA
V
IH
PLLIN, FCB High Level Input Voltage ● 2.4 V
V
IL
PLLIN, FCB Low Level Input Voltage ● 0.8 V
I
PGOOD
V
PGOOD
Leakage Current Power Good ±1 µA
V
OLPG
V
PGOOD
Output Low Voltage I
PGOOD
= 1mA ● 0.1 0.3 V
t
PGOOD
V
PGOOD
Falling Edge Delay (Note 8) ● 100 150 µs
V
PGOOD
Rising Edge Delay (Note 8) 10 µs
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LTC3802EUH#TRPBF

Mfr. #:
Buy LTC3802EUH#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2-Phase, Dual, Step Dwn Synch Controller
Lifecycle:
New from this manufacturer.
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