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Final Electrical Specifications
LT1610 1.7MHz, Single Cell Micropower DC/DC Converter
July 1998
FEATURES
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DESCRIPTION
The LT(R)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 VC pin, eliminating two components. No-load quiescent current of the LT1610 is 30A 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.
Uses Tiny Capacitors and Inductor Internally Compensated Low Quiescent Current: 30A Operates with VIN as Low as 1V 3V at 30mA from a Single Cell 5V at 200mA from 3.3V Output Voltage: Up to 28V Low Shutdown Current: < 1A Automatic Burst ModeTM Switching at Light Load Low VCESAT Switch: 300mV at 300mA 8-Lead MSOP and SO Packages
APPLICATIONS
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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 APPLICATION
1-Cell to 3V Step-Up Converter
L1 4.7H D1 85 VOUT 3V 30mA
EFFICIENCY (%)
VOUT = 3V 80 VIN = 1.25V 75 70 65 60 55 50 VIN = 1.5V
6 VIN 3
5 SW FB LT1610 2
R1 1M
+
1 CELL
SHDN
C1 22F
8
R2 681k GND 7
+
C2 22F
COMP VC 1
PGND 4
C1, C2: AVX TAJA226M010R D1: MOTOROLA MBR0520 L1: MURATA LQH1C4R7
0.1
1610 TA01
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 representation that the interconnection of circuits as described herein will not infringe on existing patent rights.
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Efficiency
VIN = 1V
1 10 LOAD CURRENT (mA)
100
1610 TA02
1
LT1610
ABSOLUTE MAXIMUM RATINGS
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 ......................... 125C Operating Temperature Range Commercial ............................................. 0C to 70C Extended Commercial (Note 1) .......... - 40C to 85C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
Consult factory for Industrial and Military grade parts.
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 ORDER PART NUMBER
8 7 6 5 COMP GND VIN SW
MS8 PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 125C, JA = 160C/W
TOP VIEW VC 1 FB 2 SHDN 3 PGND 4
LT1610CS8 S8 PART MARKING 1610
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 125C, JA = 120C/W
ELECTRICAL CHARACTERISTICS
Commercial grade 0C to 70C, VIN = 1.5V, VSHDN = VIN, TA = 25C unless otherwise noted. (Note 1)
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 (25C, 0C) 1V VIN 2V (70C) 2V VIN 8V (25C, 0C) 2V VIN 8V (70C) I = 2A
q q q
CONDITIONS
MIN
TYP 0.9
MAX 1 8 1.26 60 0.5 1.0 60 1 2 0.3 0.4
UNITS V V V A A A nA %/V %/V %/V %/V mhos V/V
1.20
1.23 30 0 0
VSHDN = 1.5V, Not Switching VSHDN = 0V, VIN = 2V VSHDN = 0V, VIN = 5V
q
27 0.6 0.1 40 100 1.4 77 75 450 1.7 80 600 300
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
2 95 95 900 350 400 1 0.3
(Note 2) ISW = 300mA
q
VSW = 5V 1 VSHDN = 3V VSHDN = 0V
0.01
10 0
0.1
The q denotes specifications which apply over the specified temperature range. Note 1: C grade device specifications are guaranteed over the 0C to 70C temperature range. In addition, C grade device specifications are assured
over the - 40C to 85C temperature range by design or correlation, but are not production tested. Note 2: 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.
2
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W
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WW
W
MHz % % mA mV mV A V V A A
LT1610
PIN FUNCTIONS
VC (Pin 1): Error Amplifier Output. Frequency compensation network must be connected to this pin, either internal (COMP pin) or external series RC to ground. 100k/ 200pF typical value. FB (Pin 2): Feedback Pin. Reference voltage is 1.23V. Connect resistive divider tap here. Minimize trace area at FB. Set VOUT according to VOUT = 1.23V (1 + R1/R2). SHDN (Pin 3): Shutdown. Ground this pin to turn off device. Tie to 1V or more to enable. PGND (Pin 4): Power Ground. Tie directly to local ground plane. SW (Pin 5): Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to keep EMI down. VIN (Pin 6): Input Supply Pin. Must be locally bypassed. GND (Pin 7): Signal Ground. Carries all device ground current except switch current. Tie to local ground plane. COMP (Pin 8): Internal Compensation Network. Tie to VC pin, or let float if external compensation is used. Output capacitor must be tantalum if COMP pin is used for compensation.
BLOCK DIAGRA
VIN 6
VOUT R1 (EXTERNAL) FB FB 2 Q1
R2 (EXTERNAL)
RAMP GENERATOR
1.7MHz OSCILLATOR
+
-
W
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VIN R5 40k R6 40k
+
gm 1 VC 8 COMP RC CC SHUTDOWN 3 SHDN 7 GND
-
Q2 x 10 R3 30k R4 140k
+
ENABLE BIAS
-
5 SW COMPARATOR FF A2 R S Q DRIVER Q3
+
A=3 0.15
-
4 PGND
1610 BD
3
LT1610
TYPICAL APPLICATIONS N
2-Cell to 5V Converter
L1 4.7H D1 VOUT 6 VIN 3 5 SW FB LT1610 8 COMP VC 1 GND PGND 4 7 2 332k 1M
EFFICIENCY (%)
+
2 CELLS
SHDN
C1 15F
C1, C2: AVX TAJA156M010R D1: MOTOROLA MBR0520 L1: SUMIDA CD43-4R7 MURATA LQH1C4R7
INPUT Li-ION 3V to 4.2V 6 VIN
RELATED PARTS
PART NUMBER LTC 1163 LTC1474 LT1302 LT1304 LT1307 LTC1440/1/2 LTC1516 LT1521
(R)
DESCRIPTION Triple High Side Driver for 2-Cell Inputs Micropower Step-Down DC/DC Converter High Output Current Micropower DC/DC Converter 2-Cell Micropower DC/DC Converter Single Cell Micropower 600kHz PWM DC/DC Converter Ultralow Power Single/Dual Comparators with Reference 2-Cell to 5V Regulated Charge Pump Micropower Low Dropout Linear Regulator
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
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+
Efficiency
90 VIN = 3V 80 VIN = 2V
+
C2 15F
70
VIN = 1.5V
60
1610 TA04
50
0.1
1
10 100 LOAD CURRENT (mA)
1000
1610 TA05
Li-Ion to 3.3V SEPIC DC/DC Converter
L1 4.7H C3 1F CERAMIC
D1
VOUT 3.3V 100mA
5 SW FB LT1610 2
1M L2 4.7H 604k
C1 22F 6.3V
1
VC
+
8
COMP GND 7
SHDN PGND 4
3
C2 22F 6.3V
C1, C2: AVX TAJA226M010R C3: AVX 1206YC105 (X7R) D1: MOTOROLA MBR0520 L1, L2: MURATA LQH3C4R7M24
1610 TA06
SHUTDOWN
COMMENTS 1.8V Minimum Input, Drives N-Channel MOSFETs 94% Efficiency, 10A IQ, 9V to 5V at 250mA 5V/600mA from 2V, 2A Internal Switch, 200A IQ Low-Battery Detector Active in Shutdown 3.3V at 75mA from 1 Cell, MSOP Package 2.8A IQ, Adjustable Hysteresis 12A IQ, No Inductors, 5V at 50mA from 3V Input 500mV Dropout, 300mA Current, 12A IQ
1610I LT/TP 0798 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1998

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