LTC1707CS8#PBF Linear Technology, LTC1707CS8#PBF Datasheet

IC BUCK SYNC ADJ .6A 8SOIC

LTC1707CS8#PBF

Manufacturer Part Number
LTC1707CS8#PBF
Description
IC BUCK SYNC ADJ .6A 8SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC1707CS8#PBF

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.8 ~ 8.5 V
Current - Output
600mA
Frequency - Switching
35kHz ~ 350kHz
Voltage - Input
2.85 ~ 8.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Primary Input Voltage
8.5V
No. Of Outputs
1
Output Voltage
8.5V
Output Current
560mA
No. Of Pins
8
Operating Temperature Range
0°C To +70°C
Msl
MSL 1 - Unlimited
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC1707CS8#PBFLTC1707CS8
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC1707CS8#PBFLTC1707CS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC1707CS8#PBFLTC1707CS8#TRPBF
Manufacturer:
TI
Quantity:
9 089
Company:
Part Number:
LTC1707CS8#PBFLTC1707CS8#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
3V TO
V
8.5V
IN
Figure 1a. High Efficiency Low Dropout Step-Down Converter
600mA Output Current (V
High Efficiency: Up to 96%
Constant Frequency: 350kHz Synchronizable
to 550kHz
2.85V to 8.5V V
0.8V Feedback Reference Allows Low Voltage
Outputs: 0.8V V
No Schottky Diode Required
1.19V 1% Reference Output Pin
Selectable Burst Mode
Skipping Mode
Low Dropout Operation: 100% Duty Cycle
Precision 2.7V Undervoltage Lockout
Current Mode Control for Excellent Line and
Load Transient Response
Low Quiescent Current: 200 A
Shutdown Mode Draws Only 11 A Supply Current
Available in 8-Lead SO Package
Cellular Telephones
Portable Instruments
Wireless Modems
RF Communications
Distributed Power Systems
Single and Dual Cell Lithium
*
+
22 F
16V
47pF
6
2
7
1
V
RUN
SYNC/MODE
I
IN
TH
U
IN
OUT
Range
LTC1707
GND
4
TM
V
IN
IN
Operation/Pulse
V
SW
REF
V
FB
4V)
5
8
3
U
*V
15 H
3V < VIN < 3.3V
OUT
FOLLOWS V
80.6k
249k
IN
FOR
+
100 F
6.3V
1707 F01a
V
3.3V
OUT
DESCRIPTIO
Burst Mode is a trademark of Linear Technology Corporation.
The LTC
mode synchronous buck regulator using a fixed frequency
architecture. The operating supply range is from 8.5V
down to 2.85V, making it suitable for both single and dual
lithium-ion battery-powered applications. Burst Mode op-
eration provides high efficiency at low load currents.
100% duty cycle provides low dropout operation, extend-
ing operating time in battery-powered systems.
The switching frequency is internally set at 350kHz,
allowing the use of small surface mount inductors. For
noise sensitive applications it can be externally synchro-
nized up to 550kHz. Burst Mode operation is inhibited
during synchronization or when the SYNC/MODE pin is
pulled low preventing low frequency ripple from interfer-
ing with audio circuitry. Soft-start is provided by an
external capacitor.
The internal synchronous MOSFET switch increases effi-
ciency and eliminates the need for an external Schottky
diode, saving components and board space. Low output
voltages down to 0.8V are easily achieved due to the 0.8V
internal reference. The LTC1707 comes in an 8-lead SO
package.
High Efficiency Monolithic
, LTC and LT are registered trademarks of Linear Technology Corporation.
Synchronous Step-Down
®
Figure 1b. Efficiency vs Output Load Current
1707 is a high efficiency monolithic current
100
Switching Regulator
95
90
85
80
75
70
1
V
OUT
U
= 3.3V
OUTPUT CURRENT (mA)
10
V
V
V
IN
IN
IN
= 3.6V
= 8.4V
= 6V
100
1707 F01b
LTC1707
1000
1

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LTC1707CS8#PBF Summary of contents

Page 1

... Low output voltages down to 0.8V are easily achieved due to the 0.8V internal reference. The LTC1707 comes in an 8-lead SO package. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation OUT + 3 ...

Page 2

LTC1707 ABSOLUTE AXI U RATI GS (Note 1) Input Supply Voltage ................................ – 0.3V to 10V I Voltage ................................................. – 0. RUN/SS, V Voltages ............................... – 0. SYNC/MODE Voltage ................................. – ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Input Voltage 100 100mA LOAD I = 300mA LOAD 10mA LOAD 2.5V OUT Burst Mode OPERATION 75 ...

Page 4

LTC1707 W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum Output Current vs Input Voltage 1000 V = 1.8V OUT 800 V = 1.5V OUT 600 OUT 400 V = 3.3V OUT V = 2.5V OUT V = ...

Page 5

CTIO S I (Pin 1): Error Amplifier Compensation Point. The TH current comparator threshold increases with this control voltage. Nominal voltage range for this pin 1.2V. RUN/SS (Pin 2): Combination of Soft-Start ...

Page 6

LTC1707 U OPERATIO (Refer to Functional Diagram) Main Control Loop The LTC1707 uses a constant frequency, current mode step-down architecture. Both the main (P-channel MOSFET) and synchronous (N-channel MOSFET) switches are internal. During normal operation, the internal top power MOSFET ...

Page 7

U OPERATIO Frequency synchronization is inhibited when the feedback voltage V is below 0.6V. This prevents the external clock FB from interfering with the frequency foldback for short- circuit protection. Dropout Operation When the input supply voltage decreases toward the ...

Page 8

LTC1707 U U APPLICATIO S I FOR ATIO with the oscillator synchronized at its minimum frequency, i.e clock just above the oscillator free-running frequency. The actual reduction in average current is less than for peak current. The basic ...

Page 9

U U APPLICATIO S I FOR ATIO size or height requirements in the design. Always consult the manufacturer if there is any question. The selection driven by the required effective series OUT resistance (ESR). Typically, once the ...

Page 10

LTC1707 U U APPLICATIO S I FOR ATIO D1 in Figure 5 reduces the start delay but allows C ramp up slowly providing the soft-start function. This diode can be deleted if soft-start is not needed. Efficiency Considerations The efficiency ...

Page 11

U U APPLICATIO S I FOR ATIO A second, more severe transient is caused by switching in loads with large (>1 F) supply bypass capacitors. The discharged bypass capacitors are effectively put in parallel with C , causing a rapid ...

Page 12

LTC1707 U U APPLICATIO S I FOR ATIO Design Example As a design example, assume the LTC1707 is used in a single lithium-ion battery-powered cellular phone applica- tion. The V will be operating from a maximum of 4.2V IN down ...

Page 13

U TYPICAL APPLICATIO S C ITH 47pF C SS 0.1 F Double Lithium-Ion Battery to 5V/0.5A Low Dropout Regulator C ITH 47pF Input to 3.3V/0.6A Regulator * SUMIDA CD54-150 AVX ...

Page 14

LTC1707 U TYPICAL APPLICATIO S C ITH 47pF SUMIDA CD54-100 ** TAIYO YUDEN LMK325BJ106K-T † AVX TPSC107M006R0150 C ITH 47pF 3.3V Input to 2.5V/0.4A Regulator ...

Page 15

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... Constant Off-Time 500mA, 1MHz Operation, OUT V from 2.5V to 5.5V IN 16-Pin SO and SSOP 36V, Fault Protection IN 550kHz, 6-Pin SOT-23 5A, OUT V from 2.2V to 10V IN 550kHz, MS8 10V OUT 550kHz, MS8 6V 600mA IN Q OUT 1707f LT/TP 0600 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1999 to 600mA ...

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