LT1610CMS8 Linear Technology, LT1610CMS8 Datasheet

IC DC/DC CONV SINGLE-CELL 8-MSOP

LT1610CMS8

Manufacturer Part Number
LT1610CMS8
Description
IC DC/DC CONV SINGLE-CELL 8-MSOP
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT1610CMS8

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.23 ~ 30 V
Current - Output
600mA
Frequency - Switching
1.7MHz
Voltage - Input
0.9 ~ 8 V
Operating Temperature
0°C ~ 70°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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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Uses Tiny Capacitors and Inductor
Internally Compensated
Low Quiescent Current: 30 A
Operates with V
3V at 30mA from a Single Cell
5V at 200mA from 3.3V
High Output Voltage Capability: Up to 28V
Low Shutdown Current: < 1 A
Automatic Burst Mode
Low V
8-Lead MSOP and SO Packages
Pagers
Cordless Phones
Battery Backup
LCD Bias
Portable Electronic Equipment
C1, C2: AVX TAJA226M006R
D1: MOTOROLA MBR0520
L1: MURATA LQH1C4R7
CESAT
1 CELL
Switch: 300mV at 300mA
+
Figure 1. 1-Cell to 3V Step-Up Converter
IN
C1
22 F
U
as Low as 1V
3
8
TM
SHDN
COMP
V
V
Switching at Light Load
IN
C
1
6
LT1610
4.7 H
L1
U
PGND
SW
GND
4
5
FB
2
7
D1
R2
681k
R1
1M
+
C2
22 F
V
3V
30mA
1610 F01
OUT
DESCRIPTIO
The LT
converter that operates from an input voltage as low as 1V.
Intended for small, low power applications, it switches at
1.7MHz, allowing the use of tiny capacitors and inductors.
The device can generate 3V at 30mA from a single cell
(1V) supply. An internal compensation network can be
connected to the LT1610’s V
nal components. No-load quiescent current of the LT1610
is 30 A, and the internal NPN power switch handles a
300mA current with a voltage drop of 300mV.
The LT1610 is available in 8-lead MSOP and SO packages.
Burst Mode is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1610 is a micropower fixed frequency DC/DC
85
80
75
70
65
60
55
50
1.7MHz, Single Cell
0.1
DC/DC Converter
U
V
OUT
= 3V
LOAD CURRENT (mA)
V
1
IN
C
Efficiency
= 1.25V
pin, eliminating two exter-
Micropower
V
IN
= 1V
10
V
IN
= 1.5V
1610 TA01
LT1610
100
1

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LT1610CMS8 Summary of contents

Page 1

... No-load quiescent current of the LT1610 and the internal NPN power switch handles a 300mA current with a voltage drop of 300mV. The LT1610 is available in 8-lead MSOP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation ...

Page 2

... Commercial ............................................. Extended Commercial (Note 2) .......... – Industrial ........................................... – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 ORDER PART NUMBER LT1610CMS8 FB 2 SHDN 3 PGND 4 MS8 PART MARKING LTDT T JMAX The denotes specifications which apply over the specified temperature = 25 C. Commercial grade ...

Page 3

ELECTRICAL C HARA TERISTICS C range, otherwise specifications are at T (Note 2) PARAMETER Switch Current Limit Switch V CESAT Switch Leakage Current SHDN Input Voltage High SHDN Input Voltage Low SHDN Pin Bias Current The denotes specifications which apply ...

Page 4

LT1610 W U TYPICAL PERFOR A CE CHARACTERISTICS V vs Current CESAT 600 500 400 300 T = – 200 100 0 100 200 300 400 500 ...

Page 5

PIN FUNCTIONS V (Pin 1): Error Amplifier Output. Frequency compensa- C tion network must be connected to this pin, either internal (COMP pin) or external series RC to ground. 220k / 220pF typical value. FB (Pin 2): ...

Page 6

LT1610 U U APPLICATIONS INFORMATION OPERATION The LT1610 combines a current mode, fixed frequency PWM architecture with Burst Mode micropower operation to maintain high efficiency at light loads. Operation can be best understood by referring to the block diagram in ...

Page 7

U U APPLICATIONS INFORMATION A SEPIC (Single-Ended Primary Inductance Converter) schematic is shown in Figure 4. This converter topology produces a regulated output over an input voltage range INPUT Li-ION 3V to 4.2V GROUND PLANE R1 R2 SHUTDOWN MULTIPLE VIAs ...

Page 8

LT1610 U U APPLICATIONS INFORMATION COMPONENT SELECTION Inductors Inductors used with the LT1610 should have a saturation current rating (–30% of zero current inductance) of ap- proximately 0.5A or greater. DCR should be 0.5 or less. The value of the ...

Page 9

... PGND 7 4 SHUTDOWN sation network is modified to achieve stable operation. Linear Technology’s Application Note 19 contains a de- tailed description of the method. A good starting point for the LT1610 is C All Ceramic, Low Profile Design Large value ceramic capacitors that are suitable for use as ...

Page 10

LT1610 U U APPLICATIONS INFORMATION output capacitor because it introduces a zero in the regulator’s loop gain. This zero may not be effective because the ceramic capacitor’s ESR is very low. Most current mode switching regulators (including the LT1610) can ...

Page 11

U TYPICAL APPLICATIONS 2-Cell to 5V Converter L1 4 SHDN + C1 LT1610 2 CELLS COMP GND V PGND C1, C2: AVX TAJA156M010R D1: MOTOROLA MBR0520 ...

Page 12

LT1610 U TYPICAL APPLICATIONS 5V to 9V/150mA Boost Converter LT1610 COMP SHDN GND PGND 7 C1: AVX TAJA156M010 C2: AVX TAJB156M016 D1: ...

Page 13

U TYPICAL APPLICATIONS 3.3V TO 8V/70mA, – 8V/5mA, 24V/5mA TFT LCD Bias Supply Uses All Ceramic Capacitors 0.22 F: TAIYO YUDEN EMK212BJ224MG 1 F: TAIYO YUDEN LMK212BJ105MG 4.7 F: TAIYO YUDEN LMK316BJ475ML D1: MOTOROLA MBRO520 D2, D3, D4: BAT54S L1: ...

Page 14

LT1610 U TYPICAL APPLICATIONS CHARGE SHUTDOWN 1 AA ALKALINE C1, C2: AVX TAJA156M010 D1: MOTOROLA MBR0530T1 L1: MURATA LQH1C4R7 Q1: 2N3906 Super Cap Charger Output Current vs Output Voltage 2.0 3.0 3.5 4.0 2.5 ...

Page 15

PACKAGE DESCRIPTION 0.007 (0.18) * 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 OR PROTRUSIONS. INTERLEAD FLASH OR ...

Page 16

... Tiny SOT-23 Package Fixed 3.3V and 5V Outputs, 1.8V to 4.4V Input Range, 50mA Output Efficiency 100 LOAD CURRENT (mA) 1610 TA15 4-Cell to 5V Efficiency 100 LOAD CURRENT (mA) 1610 TA17 , 250mA Q Q 1610f LT/TP 0699 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1998 ...

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