LT1612EMS8 Linear Technology, LT1612EMS8 Datasheet

IC CONV DC/DC PWM STEPDOWN 8MSOP

LT1612EMS8

Manufacturer Part Number
LT1612EMS8
Description
IC CONV DC/DC PWM STEPDOWN 8MSOP
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LT1612EMS8

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
Adj to 0.6V
Current - Output
500mA
Frequency - Switching
800kHz
Voltage - Input
2 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

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Quantity
Price
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APPLICATIO S
FEATURES
TYPICAL
Portable Devices
Lithium-Ion Step-Down Converters
5V to 3.3V Conversion
2-Cell Alkaline Step-Down Converters
Operates from Input Voltage As Low As 2V
Internal 0.7A Synchronous Switches
Uses Ceramic Input and Output Capacitors
620mV Reference Voltage
800kHz Fixed Frequency Switching
Programmable Burst Mode Operation
Low Quiescent Current: 160 A
8-Lead MSOP or SO Package
V
10 F
2V
IN
C1
C1: TAIYO-YUDEN JMK325BJ106MN
C2: PANASONIC EEFCDOF680R
L1: SUMIDA CD43-100
APPLICATION
Figure 1. 2V to 1.2V Converter
SHDN
MODE
V
V
IN
C
33.2k
LT1612
330pF
U
BOOST
GND
SW
FB
0.1 F
232k
1%
R2
U
10 H
100pF
215k
L1
1%
R1
C2
68 F
3.15V
V
1.2V
500mA
OUT
1612 F01a
DESCRIPTIO
The LT
DC converter that operates from an input voltage as low
as 2V. Internal 0.45 switches deliver output currents up
to 500mA, and the 800kHz switching frequency allows the
use of small, low value ceramic input and output capaci-
tors. Input voltage ranges from 5.5V down to 2V and
output voltage can be set as low as the 620mV reference.
The device features Burst Mode
efficiency high at light loads. Burst Mode operation can be
defeated by pulling the MODE pin high, enabling constant
switching throughout the load range for low noise.
No-load quiescent current is 160 A and shutdown current
is less than 1 A. The device is available in 8-lead SO and
MSOP packages.
Burst Mode is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Synchronous, Step-Down
®
1612 is an 800kHz, synchronous step-down DC/
Efficiency for LT1612 vs Linear Regulator
90
80
70
60
50
40
30
10
DC/DC Converter
U
V
V
IN
IN
LOAD CURRENT (mA)
= 2V (LINEAR)
= 3V (LINEAR)
V
OUT
100
= 1.2V
V
V
800kHz PWM
IN
IN
= 2V
= 3V
TM
operation, keeping
1612 • F01b
500
LT1612
sn1612 1612fs
1

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LT1612EMS8 Summary of contents

Page 1

... MODE pin high, enabling constant switching throughout the load range for low noise. No-load quiescent current is 160 A and shutdown current is less than 1 A. The device is available in 8-lead SO and MSOP packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation OUT 1 ...

Page 2

... Junction Temperature ........................................... 125 C + 0.3V Operating Temperature Range (Note 2) ... – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 ORDER PART NUMBER LT1612EMS8 GND 4 MS8 PART MARKING 8-LEAD PLASTIC SO LTMS T JMAX The denotes specifications which apply over the full operating CONDITIONS MODE = 5V ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are SHDN = 3V SYMBOL PARAMETER SHDN Pin Current BOOST Pin Current Switch Current Limit (Note 4) Burst Mode Operation Current Limit Switch Voltage Drop ...

Page 4

LT1612 W U TYPICAL PERFOR A CE CHARACTERISTICS SHDN Pin Bias Current SHDN PIN VOLTAGE (V) 1612 • G04 Maximum Duty Cycle vs Temperature 94 90 ...

Page 5

PIN FUNCTIONS V (Pin 1): Compensation Pin. This is the current sink/ C source output of the error amplifier. By connecting an RC network from this pin to ground, frequency response can be tuned for a wide ...

Page 6

LT1612 U OPERATIO The LT1612 employs fixed frequency, current mode con- trol. This type of control uses two feedback loops. The main control loop sets output voltage and operates as follows: A load step causes V and the FB voltage ...

Page 7

U OPERATIO Burst Mode Operation Defeat To maintain high efficiency at light loads, the LT1612 will automatically shift into Burst Mode operation (MODE = 0V or floating). In this mode of operation the oscillator and switch drive circuitry is alternately ...

Page 8

LT1612 U TYPICAL APPLICATIONS Single Li-Ion to 2V Converter 0 BOOST V IN 2.7V TO 4.2V SW SHDN LT1612 MODE FB V GND 30.1k CERAMIC 453k 1% 680pF C1: TAIYO-YUDEN LMK325BJ106MN C2: TAIYO-YUDEN LMK325BJ226MN ...

Page 9

U TYPICAL APPLICATIONS 5V to 2.5V Converter 0 BOOST SHDN LT1612 MODE FB V GND 30.1k CERAMIC 680pF C1: TAIYO-YUDEN LMK325BJ106MN C2: TAIYO-YUDEN LMK325BJ226MN L1: SUMIDA CD43-100 2V to ...

Page 10

LT1612 PACKAGE DESCRIPTION 0.007 (0.18) 0.021 0.006 (0.53 0.015) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... LOAD CURRENT (mA) 1612 TA01b , V from 3V to 18V, MSOP Package up to 300mA Q IN from 3.6V to 25V, SOT-23 Package from 2.65V to 8. 2.65 V 10V, MSOP Package up to 600mA High Efficiency 95%, MSOP Package Q sn1612 1612fs LT/TP 1100 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1999 ...

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