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LT1934EDCB-1#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT1934/LT1934-1
1
1934fe
TYPICAL APPLICATION
DESCRIPTION
Micropower Step-Down
Switching Regulators
in ThinSOT and DFN
The LT
®
1934 is a micropower step-down DC/DC converter
with internal 400mA power switch, packaged in a low
profi le (1mm) ThinSOT. With its wide input range of 3.2V
to 34V, the LT1934 can regulate a wide variety of power
sources, from 4-cell alkaline batteries and 5V logic rails
to unregulated wall transformers and lead-acid batteries.
Quiescent current is just 12μA and a zero current shut-
down mode disconnects the load from the input source,
simplifying power management in battery-powered sys-
tems. Burst Mode
®
operation and the low drop internal
power switch result in high effi ciency over a broad range
of load current.
The LT1934 provides up to 300mA of output current. The
LT1934-1 has a lower current limit, allowing optimum
choice of external components when the required output
current is less than 60mA. Fast current limiting protects
the LT1934 and external components against shorted
outputs, even at 34V input.
L, LT, LTC and LTM 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.
All other trademarks are the property of their respective owners.
FEATURES
APPLICATIONS
n
Wide Input Voltage Range: 3.2V to 34V
n
Micropower Operation: I
Q
= 12μA
n
5V at 250mA from 6.5V to 34V Input (LT1934)
n
5V at 60mA from 6.5V to 34V Input (LT1934-1)
n
3.3V at 250mA from 4.5V to 34V Input (LT1934)
n
3.3V at 60mA from 4.5V to 34V Input (LT1934-1)
n
Low Shutdown Current: <1μA
n
Low V
CESAT
Switch: 200mV at 300mA
n
Low Profi le (1mm) SOT-23 (ThinSOT™) and
(2mm × 3mm × 0.8mm) 6-Pin DFN Package
n
Wall Transformer Regulation
n
Automotive Battery Regulation
n
Standby Power for Portable Products
n
Distributed Supply Regulation
n
Industrial Control Supplies
3.3V Step-Down Converter
Effi ciency
BOOST
V
IN
LT1934
SHDN
1934 TA01
C2
2.2μF
0.22μF
10pF
C1: SANYO 4TPB100M
C2: TAIYO YUDEN GMK325BJ225MN
D1: ON SEMICONDUCTOR MBR0540
D2: CENTRAL CMDSH-3
L1: SUMIDA CDRH4D28-470
V
OUT
3.3V
250mA
D2
604k
1M
L1
47μH
D1
V
IN
4.5V TO 34V
ON OFF
SW
FB
GND
C1
100μF
+
LOAD CURRENT (mA)
60
EFFICIENCY (%)
70
80
90
100
0.1 10 100
1934 TA02
50
1
LT1934
V
IN
= 12V
V
OUT
= 5V
V
OUT
= 3.3V
LT1934/LT1934-1
2
1934fe
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
IN
) ................................................... 34V
BOOST Pin Voltage ................................................. 40V
BOOST Pin Above SW Pin ........................................ 20V
SHDN Pin ................................................................. 34V
FB Voltage .................................................................. 6V
SW Voltage ............................................................... V
IN
(Note 1)
BOOST 1
GND 2
FB 3
6 SW
5 V
IN
4 SHD
N
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C, θ
JA
= 250°C/ W, θ
JC
= 102°C/W
TOP VIEW
FB
GND
SHD
N
BOOST
SW
V
IN
DCB PACKAGE
6-LEAD (2mm s 3mm) PLASTIC DFN
4
5
7
6
3
2
1
θ
JA
= 73.5°C/ W, θ
JC
= 12°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDEDED TO PCB
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL S6 PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1934ES6#PBF LT1934ES6#TRPBF LTXP 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1934ES6-1#PBF LT1934ES6-1#TRPBF LTF8 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1934IS6#PBF LT1934IS6#TRPBF LTAJB 6-Lead Plastic TSOT-23 –40°C to 125°C
LT1934IS6-1#PBF LT1934IS6-1#TRPBF LTAJC 6-Lead Plastic TSOT-23 –40°C to 125°C
LT1934IDCB#PBF LT1934IDCB#TRPBF LCFZ
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LT1934EDCB#PBF LT1934EDCB#TRPBF LCFZ
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 85°C
LT1934IDCB-1#PBF LT1934IDCB-1#TRPBF LDHC
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LT1934EDCB-1#PBF LT1934EDCB-1#TRPBF LDHC
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 85°C
LEAD BASED FINISH TAPE AND REEL S6 PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1934ES6 LT1934ES6#TR LTXP 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1934ES6-1 LT1934ES6-1#TR LTF8 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1934IS6 LT1934IS6#TR LTAJB 6-Lead Plastic TSOT-23 –40°C to 125°C
LT1934IS6-1 LT1934IS6-1#TR LTAJC 6-Lead Plastic TSOT-23 –40°C to 125°C
LT1934IDCB LT1934IDCB#TR LCFZ
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LT1934EDCB LT1934EDCB#TR LCFZ
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 85°C
LT1934IDCB-1 LT1934IDCB-1#TR LDHC
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LT1934EDCB-1 LT1934EDCB-1#TR LDHC
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
Operating Temperature Range (Note 2)
LT1934E/LT1934E-1 .............................– 40°C to 85°C
LT1934I/LT1934I-1 .............................–40°C to 125°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT-23 ............................................................ 300°C
LT1934/LT1934-1
3
1934fe
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT1934E and LT1934E-1 are guaranteed to meet performance
specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C
SYMBOL CONDITIONS MIN TYP MAX UNITS
Undervoltage Lockout
–40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
3
3
3
3.2
3.6
3.6
V
V
V
Quiescent Current V
FB
= 1.3V
–40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
12
12
12
22
26
26
μA
μA
μA
V
SHDN
= 0V 0.01 2 μA
FB Comparator Trip Voltage V
FB
Falling –40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
1.22
1.21
1.25
1.25
1.27
1.27
V
V
FB Comparator Hysteresis 10 mV
FB Pin Bias Current V
FB
= 1.25V –40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
2
2
±15
±60
nA
nA
FB Voltage Line Regulation 4V < V
IN
< 34V 0.007 %/V
Switch Off Time V
FB
> 1V
V
FB
= 0V
1.4 1.8
12
2.3 μs
μs
Maximum Duty Cycle V
FB
= 1V –40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
85
83
88
88
%
%
Switch V
CESAT
I
SW
= 300mA (LT1934, S6 Package)
I
SW
= 300mA (LT1934, DCB Package)
I
SW
= 75mA (LT1934-1, S6 Package)
I
SW
= 75mA (LT1934-1, DCB Package)
200
225
65
70
300
120
mV
mV
mV
mV
Switch Current Limit LT1934
LT1934-1
350
90
400
120
490
160
mA
mA
BOOST Pin Current I
SW
= 300mA (LT1934)
I
SW
= 75mA (LT1934-1)
8.5
6.0
12
10
mA
mA
Minimum Boost Voltage (Note 3) I
SW
= 300mA (LT1934)
I
SW
= 75mA (LT1934-1)
1.8
1.7
2.5
2.5
V
V
Switch Leakage Current 2μA
SHDN Pin Current V
SHDN
= 2.3V
V
SHDN
= 34V
0.5
1.5 5
μA
μA
SHDN Input Voltage High 2.3 V
SHDN Input Voltage Low 0.25 V
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 10V, V
BOOST
= 15V, unless otherwise noted.
operating temperature range are assured by design, characterization and
correlation with statistical process controls. The LT1934I and LT1934I-1
specifi cations are guaranteed over the –40°C to 125°C temperature range.
Note 3: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT1934EDCB-1#TRMPBF

Mfr. #:
Buy LT1934EDCB-1#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 90mA(Isw), Micropower Step-Down DC/DC in 2mm x 3mm DFN 6
Lifecycle:
New from this manufacturer.
Delivery:
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