LTC3701 Linear Technology, LTC3701 Datasheet
LTC3701
Manufacturer Part Number
LTC3701
Description
2-Phase/ Low Input Voltage/ Dual Step-Down DC/DC Controller
Manufacturer
Linear Technology
Datasheet
1.LTC3701.pdf
(20 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC3701EGN
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC3701EGN#PBF
Manufacturer:
LT/凌特
Quantity:
20 000
Part Number:
LTC3701EGN#TR
Manufacturer:
LT/凌特
Quantity:
20 000
Part Number:
LTC3701EGN#TRPBF
Manufacturer:
LT/凌特
Quantity:
20 000
Company:
Part Number:
LTC3701EGNPBF
Manufacturer:
LINEAR
Quantity:
1 306
Part Number:
LTC3701ENG#TR
Manufacturer:
LT/凌特
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Burst Mode is a registered trademark of Linear Technology Corporation.
78.7k
80.6k
100k
169k
, LTC and LT are registered trademarks of Linear Technology Corporation.
One or Two Lithium-Ion Powered Applications
Notebook and Handheld Computers
Personal Digital Assistants
Portable Instruments
Distributed DC Power Systems
Out-of-Phase Controllers Reduce Required
Input Capacitance
True PLL for Frequency Locking or Frequency
Adjustment
Operating Frequency Range: 300kHz to 750kHz
Wide V
Constant Frequency Current Mode Architecture
Low Dropout: 100% Duty Cycle
Power Good Output Voltage Monitor
Internal Soft-Start Circuitry
Selectable Burst Mode
at Light Loads
Output Overvoltage Protection
Low Quiescent Current: 460 A
0.8V 2% Voltage Reference
Small 16-Lead Narrow SSOP Package
D1, D2: IR10BQ015 L1, L2: LQN6C-4R7 M1, M2: FDC638P
Figure 1. High Efficiency 2-Phase 550kHz Dual Step-Down Converter
10k
10k
IN
220pF
220pF
Range: 2.5V to 10V
1
3
2
4
6
5
7
8
U
SENSE1
V
I
SGND
I
V
PLLLPF
SENSE2
TH
TH
FB1
FB2
/RUN1
/RUN2
LTC3701
–
–
®
EXTCLK/MODE
/Pulse Skipping Operation
SENSE1
SENSE2
PGATE1
PGATE2
PGOOD
PGND
V
IN
+
+
U
16
15
14
13
12
11
10
9
0.03
0.03
M2
M1
Dual Step-Down DC/DC Controller
D1
D2
4.7 H
4.7 H
L1
L2
3701 F01a
+
+
47 F
47 F
DESCRIPTIO
The LTC
rent mode step-down DC/DC controller providing excellent
load and line regulation. Power loss and noise due to ESR
of the input capacitor are minimized by operating the two
controller output stages out-of-phase.
The LTC3701 provides a 0.8V 2% voltage reference and
consumes only 460 A of quiescent current. To further
maximize the life of a battery source, the external
P-channel MOSFET is turned on continuously in dropout
(100% duty cycle).
Switching frequency is internally set at 550kHz, allowing
the use of small inductors and capacitors. For noise sen-
sitive applications, the LTC3701 can be externally syn-
chronized using its phase-locked loop. The frequency can
also be externally set from 300kHz to 750kHz by applying
a voltage to the PLLLPF pin. Burst Mode operation is inhib-
ited during synchronization or when the EXTCLK/MODE
pin is pulled low to reduce noise and RF interference.
The LTC3701 contains independent internal soft-start
circuitry for each controller. Other features include a
power good output voltage monitor and output overvolt-
age and short-circuit protection.
The LTC3701 is available in a small footprint 16-lead nar-
row SSOP package.
2.5V TO 9.8V
2-Phase, Low Input Voltage,
V
IN
10 F
V
2.5V
2A
V
1.8V
2A
OUT1
OUT2
®
3701 is a 2-phase dual constant frequency cur-
U
100
90
80
70
60
50
40
1
Efficiency vs Load Current
V
10
IN
LOAD CURRENT (mA)
V
= 4.2V
IN
= 8.4V
100
LTC3701
V
IN
= 3.3V
V
IN
1000
= 6V
V
OUT
= 2.5V
3701 F01b
3701fa
1
10000
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