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PDF LT1610IS8 Data sheet ( Hoja de datos )
| Número de pieza | LT1610IS8 | |
| Descripción | 1.7MHz/ Single Cell Micropower DC/DC Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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
1 page  
LT1610
PIN FUNCTIONS
VC (Pin 1): Error Amplifier Output. Frequency compensa-
tion network must be connected to this pin, either internal
(COMP pin) or external series RC to ground. 220kΩ/
220pF 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 com-
pensation.
BLOCK DIAGRA
VOUT
VIN
6
R5
40k
R1
(EXTERNAL)
FB
FB 2
Q1
R2
(EXTERNAL)
VIN
R6
40k
+
A1
gm
–
Q2
× 10
R3
30k
R4
140k
1 VC
8 COMP
RC
CC
+
BIAS –
SHUTDOWN
3 SHDN
7 GND
ENABLE
– COMPARATOR
ΣRAMP
GENERATOR
A2
+
FF
RQ
S
5 SW
DRIVER
Q3
+
1.7MHz
OSCILLATOR
A=3
–
0.15Ω
4 PGND
1610 F02
Figure 2. LT1610 Block Diagram
5
5 Page 
TYPICAL APPLICATIONS
2-Cell to 5V Converter
L1
4.7µH
D1
+
2 CELLS
6
VIN
3
SHDN
5
SW
2
FB
C1
15µF
8
LT1610
COMP
VC
GND
PGND
7
14
VOUT
5V
50mA
1M
+
324k
C2
15µF
C1, C2: AVX TAJA156M010R
D1: MOTOROLA MBR0520
L1: SUMIDA CD43-4R7
MURATA LQH1C4R7
1610 TA02
2-Cell to 3.3V Converter
L1
4.7µH
D1
+
2 CELLS
C1
10µF
65
VIN
1
VC
SW
2
FB
LT1610
8
COMP
3
SHDN
GND PGND
74
VOUT
3.3V
70mA
R2
1M
R3 +
604k
C2
33µF
C1: AVX TAJA106M010R
C2: AVX TAJB336M006R
D1: MBR0520
L1: MURATA LQH3C4R7
SHUTDOWN
1610 TA04
5V to 12V/100mA Boost Converter
VIN
5V
+ C1
15µF
L1
10µH
D1
65
VIN
1
VC
SW
2
FB
LT1610
8
COMP
3
SHDN
GND PGND
74
VOUT
12V
100mA
R2
1M
R3 +
115k
C2
15µF
C1: AVX TAJA156M010
C2: AVX TAJB156M016
D1: MOTOROLA MBR0520
L1: MURATA LQH3C100M24
SHUTDOWN
1610 TA06
LT1610
90
80 VIN = 2V
Efficiency
VIN = 3V
70 VIN = 1.5V
60
50
0.1
1 10 100
LOAD CURRENT (mA)
1000
1610 TA03
90
3.3VOUT
80
70
Efficiency
3VIN
1.5VIN
60
2VIN
50
0.1
1 10 100
LOAD (mA)
1000
1610 TA05
90
85
80
75
70
65
60
55
50
0.1
Efficiency
1 10
LOAD CURRENT (mA)
100
1610 TA07
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1610IS8.PDF ] | |
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