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Part: LT1610
Category:
Power Management
-> Regulators
-> Switching Regulators
-> SEPIC
Description: LT1610, 0.45A, 1.7MHz, Single Cell Micropower DC/DC Converter
Company: Linear Technology Corporation
Datasheet: Download LT1610 datasheet File size : 550 kB
Request For quote: Find where to buy LT1610
Datasheet text preview:
LT1610 1.7MHz, Single Cell Micropower DC/DC Converter
FEATURES
s s s s s s s s s s s
DESCRIPTIO
Uses Tiny Capacitors and Inductor Internally Compensated Low Quiescent Current: 30µA Operates with VIN as Low as 1V 3V at 30mA from a Single Cell 5V at 200mA from 3.3V High Output Voltage Capability: Up to 28V Low Shutdown Current: < 1µA Automatic Burst ModeTM Switching at Light Load Low VCESAT Switch: 300mV at 300mA 8-Lead MSOP and SO Packages
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 external 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.
APPLICATIO S
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Pagers Cordless Phones Battery Backup LCD Bias Portable Electronic Equipment
, 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
VO U T 3V 30mA R1 1M
85 VOUT = 3V 80 VIN = 1.25V 75 VIN = 1.5V
6 VIN 3
5 SW FB LT1610 2
+
1 CELL
C1 22µF
8
R2 681k GND 7
+
C2 22µF
EFFICIENCY (%)
SHDN
70 65 60 55
COMP VC 1
PGND 4
C1, C2: AVX TAJA226M006R D1: MOTOROLA MBR0520 L1: MURATA LQH1C4R7
1610 F01
50 0.1 1 10 LOAD CURRENT (mA) 100
1610 TA01
Figure 1. 1-Cell to 3V Step-Up Converter
U
Efficiency
VIN = 1V
U
U
1
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
PACKAGE/ORDER INFORMATION
TOP VIEW VC FB SHDN PGND 1 2 3 4 8 7 6 5 COMP GND VIN SW
ORDER PART NUMBER LT1610CMS8 MS8 PART MARKING LTDT
VC 1 FB 2 SHDN 3 PGND 4
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 125°C, JA = 160°C/W
Consult factory for Military grade parts.
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 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
q q q
ELECTRICAL CHARACTERISTICS
CONDITIONS
VSHDN = 1.5V, Not Switching VSHDN = 0V, VIN = 2V VSHDN = 0V, VIN = 5V
q
Error Amp Transconductance Error Amp Voltage Gain Switching Frequency Maximum Duty Cycle
2
U
U
W
WW U
W
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
TOP VIEW 8 7 6 5 COMP GND VIN SW
ORDER PART NUMBER LT1610CS8 LT1610IS8 S8 PART MARKING 1610 1610I
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125°C, JA = 120°C/W
MIN
TYP 0.9
MAX 1 8 1.26 60 0.5 1.0 80 1 2 0.15 0.2
UNITS V V V µA µA µA nA %/V %/V %/V %/V µmhos V/V
1.20
1.23 30 0.01 0.01 27 0.6 0.03 25 100
1.4 77 75
1.7 80
2 95 95
MHz % %
LT1610
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 Switch Current Limit Switch VCESAT Switch Leakage Current SHDN Input Voltage High SHDN Input Voltage Low SHDN Pin Bias Current VSHDN = 3V VSHDN = 0V 10 0.01 CONDITIONS (Note 3) ISW = 300mA
q
ELECTRICAL CHARACTERISTICS
MIN 450
TYP 600 300 0.01
MAX 900 350 400 1 0.3 0.1
UNITS mA mV mV µA V V µA µA
VSW = 5V 1
The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. Industrial grade 40°C to 85°C, VIN = 1.5V, VSHDN = VIN, unless otherwise noted.
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 Switch Current Limit Switch VCESAT Switch Leakage Current SHDN Input Voltage High SHDN Input Voltage Low SHDN Pin Bias Current VSHDN = 3V VSHDN = 0V 10 0.01 ISW = 300mA
q q
CONDITIONS TA = 85°C TA = 40°C
MIN
TYP 0.9
MAX 1 1.25 8 1.26 60 0.5 1.0 80 0.15 0.2
UNITS V V V V µA µA µA nA %/V %/V µmhos V/V
1.20
1.23 30 0.01 0.01
VSHDN = 0V, VIN = 2V VSHDN = 0V, VIN = 5V
q
27 0.03 25 100
2V VIN 8V ( 40°C) 2V VIN 8V (85°C) I = 2µA (Note 4) (Note 4)
q q
1.4 77 75 450
1.7 80 600 300 0.01
2 95 95 900 350 400 1 0.3 0.1
MHz % % mA mV mV µA V V µA µA
VSW = 5V 1
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1610C is guaranteed to meet specified performance from 0°C to 70°C and is designed, characterized and expected to meet these extended temperature limits, but is not tested at 40°C and 85°C. The LT1610I is guaranteed to meet the extended temperature limits.
Note 3: Current limit guaranteed by design and/or correlation to static test. Current limit is affected by duty cycle due to ramp generator. See Block Diagram. Note 4: Not 100% tested at 85°C.
3
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