LTC1872BES6#TRMPBF Linear Technology, LTC1872BES6#TRMPBF Datasheet

IC DC/DC CONTRLR STEP-UP SOT23-6

LTC1872BES6#TRMPBF

Manufacturer Part Number
LTC1872BES6#TRMPBF
Description
IC DC/DC CONTRLR STEP-UP SOT23-6
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LTC1872BES6#TRMPBF

Internal Switch(s)
No
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
0.8 ~ 36 V
Frequency - Switching
550kHz
Voltage - Input
2.5 ~ 9.8 V
Operating Temperature
-65°C ~ 150°C
Mounting Type
Surface Mount
Package / Case
SOT-23-6
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Power - Output
-
Other names
LTC1872BES6#TRMPBFTR

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FEATURES
APPLICATIO S
TYPICAL
Optical Communications
Lithium-Ion-Powered Applications
Cellular Telephones
Wireless Devices
Portable Computers
Scanners
Burst Mode
Ripple at Light Loads
High Efficiency: Over 90%
High Output Currents Easily Achieved
Wide V
V
Constant Frequency 550kHz Operation
Current Mode Operation for Excellent Line and Load
Transient Response
Shutdown Mode Draws Only 8 A Supply Current
Low Profile (1mm) ThinSOT
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: MURATA GRM42-2X5R106K010AL
D1: IR10BQ015
L1: MURATA LQN6C4R7M04
M1: Si2302DS
R1: DALE 0.25W
OUT
Figure 1. LTC1872B High Output Current 3.3V to 5V Boost Converter
220pF
80.6k
147k
Limited Only by External Components
IN
Range: 2.5V to 9.8V
APPLICATION
TM
1
2
3
Operation Disabled for Lower Output
I
GND
V
TH
FB
/RUN
LTC1872B
U
422k
SENSE
NGATE
V
IN
5
4
6
TM
Package
U
M1
R1
0.03
L1
4.7 H
D1
C1
10 F
10V
C2
4 10 F
10V
DC/DC Controller in ThinSOT
DESCRIPTIO
The LTC
step-up DC/DC controller providing excellent AC and DC
load and line regulation. The device incorporates an accu-
rate undervoltage lockout feature that shuts down the
LTC1872B when the input voltage falls below 2.0V.
The LTC1872B provides a 2.5% output voltage accuracy
and consumes only 270 A of quiescent current. In shut-
down, the device draws a mere 8 A.
High constant operating frequency of 550kHz allows the
use of a small external inductor. The constant frequency
operation is maintained down to very light loads, resulting
in less low frequency noise generation over a wide load
current range.
The LTC1872B is available in a 6-lead low profile (1mm)
ThinSOT package. For a Burst Mode operation enabled
version of the LTC1872B, please refer to the LTC1872 data
sheet.
Burst Mode and ThinSOT are trademarks of Linear Technology Corporation.
1872B TA01
, LTC and LT are registered trademarks of Linear Technology Corporation.
V
3.3V
V
5V
1A
IN
OUT
Current Mode Step-Up
®
1872B is a constant frequency current mode
Constant Frequency
*Output ripple waveforms for the circuit of Figure 1 appear in Figure 2.
100
95
90
85
80
75
70
65
U
Typical Efficiency vs Load Current*
1
V
V
IN
OUT
= 3.3V
= 5V
LOAD CURRENT (mA)
10
LTC1872B
100
1872B TA01b
1000
1

Related parts for LTC1872BES6#TRMPBF

LTC1872BES6#TRMPBF Summary of contents

Page 1

... The LTC1872B is available in a 6-lead low profile (1mm) ThinSOT package. For a Burst Mode operation enabled version of the LTC1872B, please refer to the LTC1872 data sheet. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and ThinSOT are trademarks of Linear Technology Corporation ...

Page 2

LTC1872B ABSOLUTE MAXIMUM (Note 1) Input Supply Voltage (V ).........................– 0.3V to 10V IN – SENSE , NGATE Voltages ............ – 0. /RUN Voltages ..............................– 0. NGATE Peak ...

Page 3

W U TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage vs Temperature 825 V = 4.2V IN 820 815 810 805 800 795 790 785 780 775 –55 –35 – 105 125 TEMPERATURE ( C) 1872B G01 Maximum ...

Page 4

LTC1872B U U FUNCTIONAL DIAGRA – V SENSE 15mV OSC FREQ FOLDBACK GND 2 U OPERATIO (Refer to Functional Diagram) Main Control Loop The LTC1872B is a constant frequency current mode switching regulator. During normal operation, ...

Page 5

U OPERATIO (Refer to Functional Diagram) Figure 2 illustrates this result for the circuit of Figure 1 using both an LTC1872 in Burst Mode operation and an LTC1872B (non-Burst Mode operation output current of 50mA, the Burst Mode ...

Page 6

LTC1872B U OPERATIO (Refer to Functional Diagram) Short-Circuit Protection Since the power switch in a boost converter is not in series with the power path from input to load, turning off the switch provides no protection from a short-circuit at ...

Page 7

U U APPLICATIONS INFORMATION This implies a minimum inductance of OUT D L MIN OUT f R SENSE A smaller value than L could be used in the circuit; MIN however, the ...

Page 8

LTC1872B U U APPLICATIONS INFORMATION OUT D RIPPLE V I OUT ESR 2 fC OUT where f is the operating frequency, C capacitance and I is the ripple current in the induc- ...

Page 9

U U APPLICATIONS INFORMATION Efficiency Considerations The efficiency of a switching regulator is equal to the output power divided by the input power times 100 often useful to analyze individual losses to determine what is limiting the efficiency ...

Page 10

LTC1872B U U APPLICATIONS INFORMATION R ITH C ITH BOLD LINES INDICATE HIGH CURRENT PATHS Figure 6. LTC1872B Layout Diagram (See PC Board Layout Checklist) U TYPICAL APPLICATIO CELLS 2. 10k ...

Page 11

... JEDEL MO-193 FOR THIN 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. LTC1872B 12V/500mA Boost Converter R1 0 ...

Page 12

... Operation Up to 60V, Fixed Frequency Current Mode 8-Pin N-Channel Drive, 3.5V V 36V Quiescent Current, V Down 95% Efficient, 0.9V V 5V, 550kHz Operation IN V 2.5V to 9.8V 4A, ThinSOT Package IN OUT Load Current 10-Lead MSOP Package, 0. 1872bf LT/TP 0601 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2001 ...

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