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LTC1874EGN Datasheet

  • LTC1874EGN

  • Dual Constant Frequency Current Mode Step-Down DC/DC Control...

  • 12頁

  • LINER

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LTC1874
Dual Constant Frequency
Current Mode Step-Down
DC/DC Controller
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
High Efficiency: Up to 94%
High Output Currents Easily Achieved
Wide V
IN
Range: 2.5V to 9.8V
Constant Frequency 550kHz Operation
Burst Mode
TM
Operation at Light Load
Low Dropout: 100% Duty Cycle
0.8V Reference Allows Low Output Voltages
Current Mode Operation for Excellent
Line and Load Transient Response
Low Quiescent Current: 270碌A (Each Controller)
Separate Shutdown Pin for Each Controller
Shutdown Mode Draws Only
8碌A Supply Current (Each Controller)
鹵2.5%
Reference Accuracy
Available in 16-Lead Narrow SSOP
Each Controller Functions Independent of the Other
The LTC
廬
1874 is a dual constant frequency current mode
step-down DC/DC controller with excellent AC and DC load
and line regulation. Each controller has an accurate
undervoltage lockout that shuts down the individual con-
troller when the input voltage falls below 2.0V.
The LTC1874 boasts
鹵2.5%
output voltage accuracy and
consumes only 270碌A of quiescent current per controller.
The LTC1874 is configured with Burst Mode operation,
which enhances efficiency at low output current for appli-
cations where efficiency is a prime consideration.
To further maximize the life of a battery source, each
external P-channel MOSFET is turned on continuously in
dropout (100% duty cycle). In shutdown, each controller
draws a mere 8碌A. High constant operating frequency of
550kHz allows the use of small external inductors.
The LTC1874 is available in a small footprint 16-lead
narrow SSOP.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
1- or 2-Cell Lithium-Ion-Powered Applications
Personal Information Appliances
Portable Computers
Distributed 3.3V, 2.5V or 1.8V Power Systems
TYPICAL APPLICATION
V
IN
3.5V
TO 9.5V
C
IN
10碌F
16V
脳2
L1 M1
4.7碌H
R1
0.04鈩?/div>
1
2
3
4
10k
220pF
13
14
15
80.6k
16
LTC1874
8
PV
IN2
V
IN1
7
SENSE1
鈥?/div>
PGATE2
6
PGND2
GND1
5
I
TH
/RUN2
V
FB1
12
V
FB2
I
TH
/RUN1
11
PGND1
GND2
10
PGATE1 SENSE2
鈥?/div>
9
PV
IN1
V
IN2
R2
0.04鈩?/div>
M2
10k
D2
220pF
L2
4.7碌H
V
OUT1
3.3V
1A
C1, C2: SANYO POSCAP 6TPA47M
C
IN
: TAIYO YUDEN CERAMIC
EMK325BJ106MNT (脳 2)
D1, D2: MBRM120
L1, L2: COILCRAFT D01608C-472
M1, M2: Si3443DV
R1, R2: DALE 0.25W
249k
+
C1
D1
47碌F
6V
Figure 1. LTC1874 3.5V-9.5V Input to 3.3V/1A and 1.8V/1A Dual Step-Down Converter
U
+
C2
47碌F
6V
V
OUT2
1.8V
1A
100k
80.6k
1874 TA01
U
U
1

LTC1874EGN 產(chǎn)品屬性

  • LTC1874

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 2

  • 650kHz

  • 100%

  • 2.5 V ~ 9.8 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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