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LTC3737EGN Datasheet

  • LTC3737EGN

  • Dual 2-Phase, No RSENSE DC/DC Controller with Output Trackin...

  • 24頁

  • LINER

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LTC3737
Dual 2-Phase, No R
SENSE
TM
,
DC/DC Controller with
Output Tracking
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
s
s
Sense Resistor Optional
Out-of-Phase Controllers Reduce Required
Input Capacitance
Programmable Output Voltage Tracking
Constant Frequency Current Mode Architecture
Wide V
IN
Range: 2.75V to 9.8V
Wide V
OUT
Range: 0.6V to V
IN
0.6V
鹵1.5%
Reference
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
(Frequency Range 250kHz to 850kHz)
Selectable Burst Mode
廬
or Pulse Skipping Operation
at Light Loads
Internal Soft-Start Circuitry
Selectable Maximum Peak Current Sense Threshold
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: I
Q
= 9碌A(chǔ)
Tiny 4mm
脳
4mm QFN and 24-Lead SSOP Packages
The LTC
廬
3737 is a 2-phase dual step-down switching
regulator controller that requires few external compo-
nents. The constant frequency current mode architecture
provides excellent AC and DC load and line regulation.
MOSFET V
DS
sensing eliminates the need for current
sense resistors and improves efficiency. Power loss and
noise due to the ESR of the input capacitance are mini-
mized by operating the two controllers out of phase.
Burst Mode operation provides high efficiency operation
at light loads. 100% duty cycle provides low dropout
operation and extends battery operating time.
Switching frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and
capacitors. For noise sensitive applications, the LTC3737
can be externally synchronized from 250kHz to 850kHz.
Other features include a power good output voltage moni-
tor, a tracking input and internal soft-start.
The LTC3737 is available in the low profile thermally
enhanced (4mm
脳
4mm) QFN package or a 24-lead SSOP
narrow package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
No R
SENSE
is a trademark of Linear Technology Corporation.
U.S. patent numbers 5481178, 5731694, 5929620, 6144194,6580258, 5994885
APPLICATIO S
s
s
s
s
One or Two Lithium-Ion Powered Devices
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems
TYPICAL APPLICATIO
187k
SW1
59k
15k
V
FB1
I
TH1
220pF
220pF
59k
118k
SENSE1
+
PV
IN1
PGATE1
M1
2.2碌H
V
IN
2.75V TO
9.8V
+
D1
47碌F
V
OUT1
2.5V
EFFICIENCY (%)
PGOOD
V
IN
LTC3737
PGND
SGND
TRACK
I
TH2
V
FB2
SW2
RUN/SS
PV
IN2
SENSE2
+
M2
3737 F01
10碌F
脳2
15k
2.2碌H
Figure 1. High Efficiency, 2-Phase, 550kHz Dual Step-Down Converter
+
PGATE2
D2
47碌F
V
OUT2
1.8V
U
Efficiency vs Load Current
100
95
90
85
80
75
70
65
60
55
50
1
10
100
1000
LOAD CURRENT (mA)
10000
3737 F01b
U
U
V
IN
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
3737f
1

LTC3737EGN 產(chǎn)品屬性

  • LTC3737

  • 55

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • PolyPhase®

  • 電流模式

  • 2

  • 825kHz

  • 100%

  • 2.75 V ~ 9.8 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 85°C

  • 24-SSOP（0.154"，3.90mm 寬）

  • 管件

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