LTC3035 반도체 회로 부품 판매점
300mA VLDO Linear Regulator
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 Linear Technology |
LTC3035www.DataSheet4U.com
300mA VLDO Linear
Regulator with Charge Pump
Bias Generator
FEATURES
■ Wide Input Voltage Range: 1.7V to 5.5V
■ Wide Adjustable Output Voltage Range:
0.4V to 3.6V
■ Built-In Charge Pump Generates High Side Bias
■ Very Low Dropout: 45mV at 300mA
■ ±2% Voltage Accuracy Over Temperature,
Supply, Load
■ Fast Transient Recovery
■ Low Operating Current: IIN = 100µA Typ
■ Low Shutdown Current: IIN = 1µA Typ
■ Stable with Ceramic Capacitor Down to 1µF
■ Output Current Limit
■ Thermal Overload Protected
■ Reverse Output Current Protected
■ Available in 8-Lead (3mm × 2mm) DFN Package
U
APPLICATIO S
■ Li-Ion to 3.3V Low Dropout Supplies
■ 2 × AA to 1.8V Low Dropout Supplies
■ Low Power Handheld Devices
■ Low Voltage Logic Supplies
■ DSP Power Supplies
■ Cellular Phones
■ Portable Electronic Equipment
■ Handheld Medical Instruments
■ Post Regulator for Switching Supply Noise Rejection
DESCRIPTIO
The LTC®3035 is a micropower, VLDO™ (very low drop-
out) linear regulator which operates from input voltages as
low as 1.7V. The device is capable of supplying 300mA of
output current with a typical dropout voltage of only
45mV. To allow operation at low input voltages the LTC3035
includes a charge pump generator that provides the nec-
essary bias voltage for the internal LDO circuitry. Output
current comes directly from the input supply for high
efficiency regulation. The charge pump bias generator
requires only a 0.1µF flying capacitor and a 1µF bypass
capacitor for operation. The low 0.4V internal reference
voltage allows the LTC3035 to be programmed to much
lower output voltages than commonly available in LDOs.
The output voltage is programmed via two tiny SMD
resistors. The LTC3035’s low quiescent current makes it
an ideal choice for use in battery-powered systems.
Other features include high output voltage accuracy, ex-
cellent transient response, stability with ultralow ESR
ceramic capacitors as small as 1µF, short-circuit and
thermal overload protection, output current limiting and
reverse output current protection. The LTC3035 is avail-
able in a tiny, low profile (3mm × 2mm × 0.75mm) 8-lead
DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
VLDO is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6411531, others pending.
TYPICAL APPLICATIO
3.3V Output Voltage from Li-Ion Battery
0.1µF
Li-Ion
BATTERY
3.4V TO 4.2V
CP CM
BIAS BIAS
IN GENERATOR
1µF 0.4V +
–
OUT
LTC3035
ADJ
OFF ON
SHDN GND
CBIAS
1µF
294k
VOUT
3.3V
COUT 300mA
1µF
40.2k
3035 TA01a
Dropout Voltage vs Load Current
70
TA = 25°C
60
50
40
30
20
10
0
0 50 100 150 200 250 300
IOUT (mA)
3035 TA01b
3035f
1
LTC3035
ABSOLUTE AXI U RATI GS
(Notes 1, 2)
VIN to GND .................................................. – 0.3V to 6V
SHDN to GND ............................................. – 0.3V to 6V
CP, CM, BIAS to GND ................................. – 0.3V to 6V
ADJ to GND ................................................ – 0.3V to 6V
VOUT to GND ............................................... – 0.3V to 6V
Operating Junction Temperature
(Note 3) ........................................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 125°C
Output Short Circuit Duration .......................... Indefinite
www.DataSheet4U.com
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
CP 1
8 BIAS
CM 2
7 SHDN
9
GND 3
6 ADJ
IN 4
5 OUT
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W
EXPOSED PAD (PIN 9) IS GND,MUST BE SOLDERED TO PCB
ORDER PART NUMBER DDB PART MARKING
LTC3035EDDB
LBRM
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full specified temperature
range, otherwise specifications are at TA = 25°C. VIN = 3.6V, VOUT = 3.3V, CFLY = 0.1µF, COUT = 1µF, CIN = 1µF, CBIAS = 1µF (all
capacitors ceramic) unless otherwise noted.
PARAMETER
VIN Operating Voltage (Note 4)
VBIAS Output Voltage Range
VOUT Output Voltage Range
VIN Operating Current
VIN Shutdown Current
VADJ Regulation Voltage (Note 5)
IADJ ADJ Input Current
OUT Load Regulation (Referred to ADJ Pin)
Dropout Voltage (Note 6)
IOUT Continuous Output Current
IOUT Short Circuit Output Current
VOUT Output Noise Voltage
VIH SHDN Input High Voltage
VIL SHDN Input Low Voltage
IIH SHDN Input High Current
IIL SHDN Input Low Current
CONDITIONS
2.63V < VIN < 5.5V
1.7V < VIN < 2.63V
IOUT = 10µA
VSHDN = 0V
1mA < IOUT < 300mA, 1.7V < VIN < 5.5V,
VOUT = 1.5V
VADJ = 0.4V
IOUT = 1mA to 300mA
VIN = 1.7V, VADJ = 0.37V, IOUT = 300mA
VADJ = VOUT = 0
F = 10Hz to 100kHz, IOUT = 150mA
SHDN = VIN
SHDN = 0V
MIN TYP MAX UNITS
● 1.7
5.5 V
● 4.8 5 5.3
● 1.85 • VIN 1.90 • VIN 1.95 • VIN
● VADJ
3.6
● 100 200
V
V
V
µA
15
µA
● 0.392 0.4 0.408
V
● –50 0 50
nA
–0.2 mV
●
45 100
mV
● 300
mA
760 mA
150 µVrms
● 1.1
V
● 0.3 V
–1 1 µA
–1 1 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 3: The LTC3035 regulator is tested and specified under pulse load
conditions such that TJ ≈ TA. The LTC3035 is 100% production tested at
25°C. Performance at –40°C and 125°C is assured by design,
characterization and correlation with statistical process control.
Note 4: Min Operating Input Voltage required for regulation is:
VIN > VOUT + VDROPOUT and VIN > 1.7V
3035f
2
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LTC3035 regulator
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