LTC3250ES6-1.2 Linear Technology, LTC3250ES6-1.2 Datasheet

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LTC3250ES6-1.2

Manufacturer Part Number
LTC3250ES6-1.2
Description
Manufacturer
Linear Technology
Type
Step Downr
Datasheet

Specifications of LTC3250ES6-1.2

Operating Supply Voltage (min)
2.7V
Operating Supply Voltage (max)
5.5V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Package Type
TSOT-23
Pin Count
6
Mounting
Surface Mount
Output Voltage
1.2V
Output Current
250mA
Lead Free Status / RoHS Status
Not Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC3250ES6-1.2
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC3250ES6-1.2#TR
Manufacturer:
LT
Quantity:
58
Part Number:
LTC3250ES6-1.2#TRMPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC3250ES6-1.2#TRPBF
0
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Handheld Computers
Cellular Phones
Digital Cameras
Handheld Medical Instruments
Low Power DSP Supplies
2.7V to 5.5V Input Voltage Range
No Inductors
Li-Ion (3.6V) to 1.5V with 81% Efficiency
Low Noise Constant Frequency Operation
Output Voltages: 1.5V 4%, 1.2V 4%
Output Current: 250mA
Shutdown Disconnects Load from V
Low Operating Current: I
Low Shutdown Current: I
Oscillator Frequency = 1.5MHz
Soft-Start Limits Inrush Current at Turn-On
Short-Circuit and Overtemperature Protected
Low Profile (1mm) SOT-23 Package
3.2V TO 4.2V
Li-Ion
V
IN
Li-Ion to 1.5V Output with Shutdown
OFF
1 F
U
ON
V
SHDN
LTC3250-1.5
C
IN
Q
SD
1 F
= 35 A
< 1 A
V
GND
C
OUT
+
U
4.7 F
IN
3250 TA1a
V
100mA
OUT
= 1.5V 4%
DESCRIPTIO
High Efficiency, Low Noise,
The LTC
down DC/DC converters that produce a 1.5V or 1.2V
regulated output from a 2.7V to 5.5V input. The parts use
switched capacitor fractional conversion to achieve typi-
cal efficiency two times higher than that of a linear regu-
lator. No inductors are required.
A unique constant frequency architecture provides a low
noise regulated output as well as lower input noise
than conventional charge pump regulators.* High
frequency operation (f
to further reduce conducted noise. The part also uses
Burst Mode
Low operating current (35 A with no load, <1 A in
shutdown) and low external parts count (three small
ceramic capacitors) make the LTC3250-1.5/LTC3250-1.2
ideally suited for space constrained battery powered appli-
cations. The parts are short-circuit and overtemperature
protected, and are available in a low profile (1mm) 6-pin
ThinSOT
Burst Mode is a registered trademark of Linear Technology Corporation
ThinSOT is a trademark of Linear Technology Corporation.
*U.S. Patent #6, 411, 531
, LTC and LT are registered trademarks of Linear Technology Corporation
LTC3250-1.5/LTC3250-1.2
Inductorless Step-Down
®
TM
3250-1.5/LTC3250-1.2 are charge pump step-
package.
®
100
90
80
70
60
50
40
30
20
10
operation to improve efficiency at light loads.
0
3.0
DC/DC Converter
Efficiency vs Input Voltage
U
3.5
OSC
(I
OUT
4.0
= 1.5MHz) simplifies filtering
= 100mA)
V
IN
LTC3250-1.5
(V)
4.5
LDO
5.0
3250 TA01b
5.5
3250fa
1

Related parts for LTC3250ES6-1.2

LTC3250ES6-1.2 Summary of contents

Page 1

... The parts are short-circuit and overtemperature protected, and are available in a low profile (1mm) 6-pin TM ThinSOT , LTC and LT are registered trademarks of Linear Technology Corporation Burst Mode is a registered trademark of Linear Technology Corporation ThinSOT is a trademark of Linear Technology Corporation. *U.S. Patent #6, 411, 531 ...

Page 2

... Junction temperature will exceed 125 C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability ORDER PART NUMBER LTC3250ES6-1 LTC3250ES6-1 OUT – PART MARKING LTZE LTAGJ = 4.7 F unless otherwise noted. OUT MIN TYP ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS No Load Supply Current vs Supply Voltage 50 3.1V < V < 5.5V (LTC3250-1.5) IN 2.7V < V < 5.5V (LTC3250-1. ...

Page 4

LTC3250-1.5/LTC3250-1 TYPICAL PERFOR A CE CHARACTERISTICS Output Voltage Soft-Start and Shutdown (LTC3250-1.5) HI SHDN LOW V OUT 500mV/DIV 3.6V IN Line Transient Response (LTC3250-1.5) 4. 3.5V V OUT 20mV/DIV AC ...

Page 5

CTIO S V (Pin 1): Input Supply Voltage. Bypass V IN low ESR ceramic capacitor. GND (Pin 2): Ground. Connect to a ground plane for best performance. SHDN (Pin 3): Active Low Shutdown Input. A ...

Page 6

... The LTC3250-1.5/LTC3250-1.2 will remain in the low current operating state until the output has dropped enough to require another burst of current. Unlike traditional charge pumps whose burst current is dependant on many factors (i.e. supply voltage, switch resistance, capacitor selection, etc.), the LTC3250- 1.5/LTC3250-1.2’ ...

Page 7

U OPERATIO (Refer to Simplified Block Diagram) current. For an ideal step-down charge pump the power efficiency is given by • OUT OUT OUT OUT • ...

Page 8

LTC3250-1.5/LTC3250-1.2 U OPERATIO (Refer to Simplified Block Diagram) Flying Capacitor Selection Warning: A polarized capacitor such as tantalum or aluminum should never be used for the flying capacitor since its voltage can reverse upon start-up of the LTC3250-1.5/LTC3250-1.2. Ceramic capacitors ...

Page 9

U OPERATIO (Refer to Simplified Block Diagram) Thermal Management For higher input voltages and maximum output current there can be substantial power dissipation in the LTC3250-1.5/LTC3250-1.2. If the junction temperature increases above approximately 160 C the thermal shut- down circuitry ...

Page 10

LTC3250-1.5/LTC3250-1.2 U TYPICAL APPLICATIO S Fixed 3.3V Input to 1.5V Output with Shutdown – 3. OUT 1 F LTC3250-1 SHDN GND OFF ON ...

Page 11

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 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. LTC3250-1.5/LTC3250-1.2 ...

Page 12

... OUT(MIN) : <1 A, ThinSOT Package SD : 2.5V to 5.5V 0.8V, IN OUT(MIN) : < Package SD : 2.5V to 5.5V 0.8V, IN OUT(MIN) : <1 A, TSSOP16E Package SD : 2.5V to 5.5V 2.5V to 5.5V, IN OUT : < Package SD : 2.4V to 5.5V 2.4V to 5.25V, IN OUT : <1 A, DFN Package SD LT/TP 1203 1K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2001 3250fa ...

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