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LTC3701EGN Datasheet

  • LTC3701EGN

  • 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller

  • 20頁

  • LINER

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LTC3701
2-Phase, Low Input Voltage,
Dual Step-Down DC/DC Controller
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
Out-of-Phase Controllers Reduce Required
Input Capacitance
True PLL for Frequency Locking or Frequency
Adjustment
Operating Frequency Range: 300kHz to 750kHz
Wide V
IN
Range: 2.5V to 10V
Constant Frequency Current Mode Architecture
Low Dropout: 100% Duty Cycle
Power Good Output Voltage Monitor
Internal Soft-Start Circuitry
Selectable Burst Mode
廬
/Pulse Skipping Operation
at Light Loads
Output Overvoltage Protection
Low Quiescent Current: 460碌A(chǔ)
0.8V
鹵2%
Voltage Reference
Small 16-Lead Narrow SSOP Package
The LTC
廬
3701 is a 2-phase dual constant frequency cur-
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
鹵2%
voltage reference and
consumes only 460碌A(chǔ) 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.
APPLICATIO S
s
s
s
s
s
One or Two Lithium-Ion Powered Applications
Notebook and Handheld Computers
Personal Digital Assistants
Portable Instruments
Distributed DC Power Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
169k
1
78.7k
10k
220pF
3
2
SENSE1
鈥?/div>
V
FB1
V
IN
2.5V TO 9.8V
16
SENSE1
+
V
IN
15
0.03鈩?/div>
M1
L1
4.7碌H
D1
M2
0.03鈩?/div>
L2
4.7碌H
100k
D1, D2: IR10BQ015 L1, L2: LQN6C-4R7 M1, M2: FDC638P
3701 F01a
Figure 1. High Efficiency 2-Phase 550kHz Dual Step-Down Converter
+
80.6k
10k
220pF
14
I
TH
/RUN1
PGATE1
13
4
LTC3701
SGND
PGND
12
6
I
TH
/RUN2
PGATE2
11
5
PGOOD
V
FB2
10
7
PLLLPF EXTCLK/MODE
9
8
SENSE2
+
SENSE2
鈥?/div>
+
47碌F
EFFICIENCY (%)
V
OUT1
2.5V
2A
10碌F
D2
47碌F
V
OUT2
1.8V
2A
U
Efficiency vs Load Current
100
V
IN
= 4.2V
90
80
V
IN
= 6V
70
60
50
40
1
V
OUT
= 2.5V
100
1000
10
LOAD CURRENT (mA)
10000
3701 F01b
U
U
V
IN
= 3.3V
V
IN
= 8.4V
3701fa
1

LTC3701EGN 產(chǎn)品屬性

  • LTC3701

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • PolyPhase®

  • 電流模式

  • 2

  • 890kHz

  • 100%

  • 2.5 V ~ 10 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 85°C

  • 16-SSOP（0.154"，3.90mm 寬）

  • 管件

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