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Linear Technology Electronic Components Datasheet

LT1610 Datasheet

Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter

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FEATURES
s Uses Tiny Capacitors and Inductor
s Internally Compensated
s Low Quiescent Current: 30µA
s Operates with VIN as Low as 1V
s 3V at 30mA from a Single Cell
s 5V at 200mA from 3.3V
s High Output Voltage Capability: Up to 28V
s Low Shutdown Current: < 1µA
s Automatic Burst ModeTM Switching at Light Load
s Low VCESAT Switch: 300mV at 300mA
s 8-Lead MSOP and SO Packages
U
APPLICATIO S
s Pagers
s Cordless Phones
s Battery Backup
s LCD Bias
s Portable Electronic Equipment
LT1610
1.7MHz, Single Cell
Micropower
DC/DC Converter
DESCRIPTIO
The LT®1610 is a micropower fixed frequency DC/DC
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 VC pin, eliminating two exter-
nal components. No-load quiescent current of the LT1610
is 30µA, 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.
TYPICAL APPLICATIO
L1
4.7µH
D1
+
1 CELL
6
VIN
3
SHDN
5
SW
2
FB
C1
22µF
8
LT1610
COMP
VC
GND
PGND
7
14
VOUT
3V
30mA
R1
1M
R2 +
681k
C2
22µF
C1, C2: AVX TAJA226M006R
D1: MOTOROLA MBR0520
L1: MURATA LQH1C4R7
Figure 1. 1-Cell to 3V Step-Up Converter
1610 F01
Efficiency
85
VOUT = 3V
80
VIN = 1.25V
75
VIN = 1.5V
70
VIN = 1V
65
60
55
50
0.1
1 10
LOAD CURRENT (mA)
100
1610 TA01
1


Linear Technology Electronic Components Datasheet

LT1610 Datasheet

Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter

No Preview Available !

LT1610
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltage ................................................................ 8V
SW Voltage ............................................... – 0.4V to 30V
FB Voltage ..................................................... VIN + 0.3V
VC Voltage ................................................................ 2V
COMP Voltage .......................................................... 2V
Current into FB Pin .............................................. ±1mA
SHDN Voltage ............................................................ 8V
Maximum Junction Temperature ......................... 125°C
Operating Temperature Range (Note 1)
Commercial ............................................. 0°C to 70°C
Extended Commercial (Note 2) .......... – 40°C to 85°C
Industrial ........................................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
VC 1
FB 2
SHDN 3
PGND 4
8 COMP
7 GND
6 VIN
5 SW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
ORDER PART
NUMBER
LT1610CMS8
MS8 PART MARKING
LTDT
Consult factory for Military grade parts.
TOP VIEW
VC 1
FB 2
SHDN 3
PGND 4
8 COMP
7 GND
6 VIN
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 120°C/W
ORDER PART
NUMBER
LT1610CS8
LT1610IS8
S8 PART MARKING
1610
1610I
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the specified temperature
range, otherwise specifications are at TA = 25°C. Commercial grade 0°C to 70°C, VIN = 1.5V, VSHDN = VIN, unless otherwise noted.
(Note 2)
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
Feedback Voltage
Quiescent Current
Quiescent Current in Shutdown
FB Pin Bias Current
Reference Line Regulation
Error Amp Transconductance
Error Amp Voltage Gain
Switching Frequency
Maximum Duty Cycle
CONDITIONS
VSHDN = 1.5V, Not Switching
VSHDN = 0V, VIN = 2V
VSHDN = 0V, VIN = 5V
1V VIN 2V (25°C, 0°C)
1V VIN 2V (70°C)
2V VIN 8V (25°C, 0°C)
2V VIN 8V (70°C)
I = 2µA
MIN
q 1.20
q
q 1.4
77
q 75
TYP MAX
0.9 1
8
1.23 1.26
30 60
0.01 0.5
0.01 1.0
27 80
0.6 1
2
0.03 0.15
0.2
25
100
1.7 2
80 95
95
UNITS
V
V
V
µA
µA
µA
nA
%/V
%/V
%/V
%/V
µmhos
V/V
MHz
%
%
2


Part Number LT1610
Description Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter
Maker Linear Technology
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LT1610 Datasheet PDF





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