Datasheet LTC3025 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 300mA Micropower VLDO Linear Regulator |
| 页数 / 页 | 12 / 1 — FEATURES. DESCRIPTION. Wide Input Voltage Range: 0.9V to 5.5V. Stable … |
| 文件格式/大小 | PDF / 182 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. Wide Input Voltage Range: 0.9V to 5.5V. Stable with Ceramic Capacitors. Very Low Dropout: 45mV at 300mA
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LTC3025 300mA Micropower VLDO Linear Regulator
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 0.9V to 5.5V
The LTC®3025 is a micropower, VLDOTM (very low drop- n
Stable with Ceramic Capacitors
out) linear regulator which operates from input voltages as n
Very Low Dropout: 45mV at 300mA
low as 0.9V. The device is capable of supplying 300mA of n
Adjustable Output Range: 0.4V to 3.6V
output current with a typical dropout voltage of only 45mV. n ±
2% Voltage Accuracy over Temperature
A BIAS supply is required to run the internal reference and
Supply Load
LDO circuitry while output current comes directly from n Low Noise: 80μVRMS (10Hz to 100kHz) the IN supply for high effi ciency regulation. The low 0.4V n BIAS Voltage Range: 2.5V to 5.5V internal reference voltage allows the LTC3025 output to n Fast Transient Recovery be programmed to much lower voltages than available in n Shutdown Disconnects Load from VIN and VBIAS common LDOs (range of 0.4V to 3.6V). The output voltage n Low Operating Current: IIN = 4μA, IBIAS = 50μA Typ is programmed via two ultrasmall SMD resistors. n Low Shutdown Current: IIN = 1μA, IBIAS = 0.01μA Typ The LTC3025’s low quiescent current makes it an ideal n Output Current Limit choice for use in battery-powered systems. For 3-cell n Thermal Overload Protection NiMH and single cell Li-Ion applications, the BIAS voltage n Available in 6-Lead (2mm × 2mm) DFN Package can be supplied directly from the battery while the input
APPLICATIONS
can come from a high effi ciency buck regulator, providing a high effi ciency, low noise output. n Low Power Handheld Devices Other features include high output voltage accuracy, n Low Voltage Logic Supplies excellent transient response, stability with ultralow ESR n DSP Power Supplies ceramic capacitors as small as 1μF, short-circuit and n Cellular Phones thermal overload protection and output current limiting. n Portable Electronic Equipment The LTC3025 is available in a tiny, low profi le (0.75mm) n Handheld Medical Instruments 6-lead DFN (2mm × 2mm) package. n Post Regulator for Switching Supply Noise Rejection L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION 1.2V Output Voltage from 1.5V Input Supply 1MHz VIN Supply Rejection
50 BIAS OUT VOUT = 1.2V I 45 COUT = 10μF 0.1μF 1μF OUT ≤ 300mA Li-Ion 1.5V HIGH LTC3025 80.6k 40 OR EFFICIENCY 1.5V 3-CELL DC/DC IN ADJ 35 COUT = 1μF NiMH BUCK 0.1μF 40.2k 30 OFF ON SHDN GND 25 3025 TA01 20 REJECTION (dB) 15 10 5 BIAS = 3.6V IOUT = 100mA VOUT = 1.2V IOUT = 300mA 0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 VIN (V) 3025 TA01b 3025fd 1
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 0.9V to 5.5V
The LTC®3025 is a micropower, VLDOTM (very low drop- n
Stable with Ceramic Capacitors
out) linear regulator which operates from input voltages as n
Very Low Dropout: 45mV at 300mA
low as 0.9V. The device is capable of supplying 300mA of n
Adjustable Output Range: 0.4V to 3.6V
output current with a typical dropout voltage of only 45mV. n ±
2% Voltage Accuracy over Temperature
A BIAS supply is required to run the internal reference and
Supply Load
LDO circuitry while output current comes directly from n Low Noise: 80μVRMS (10Hz to 100kHz) the IN supply for high effi ciency regulation. The low 0.4V n BIAS Voltage Range: 2.5V to 5.5V internal reference voltage allows the LTC3025 output to n Fast Transient Recovery be programmed to much lower voltages than available in n Shutdown Disconnects Load from VIN and VBIAS common LDOs (range of 0.4V to 3.6V). The output voltage n Low Operating Current: IIN = 4μA, IBIAS = 50μA Typ is programmed via two ultrasmall SMD resistors. n Low Shutdown Current: IIN = 1μA, IBIAS = 0.01μA Typ The LTC3025’s low quiescent current makes it an ideal n Output Current Limit choice for use in battery-powered systems. For 3-cell n Thermal Overload Protection NiMH and single cell Li-Ion applications, the BIAS voltage n Available in 6-Lead (2mm × 2mm) DFN Package can be supplied directly from the battery while the input
APPLICATIONS
can come from a high effi ciency buck regulator, providing a high effi ciency, low noise output. n Low Power Handheld Devices Other features include high output voltage accuracy, n Low Voltage Logic Supplies excellent transient response, stability with ultralow ESR n DSP Power Supplies ceramic capacitors as small as 1μF, short-circuit and n Cellular Phones thermal overload protection and output current limiting. n Portable Electronic Equipment The LTC3025 is available in a tiny, low profi le (0.75mm) n Handheld Medical Instruments 6-lead DFN (2mm × 2mm) package. n Post Regulator for Switching Supply Noise Rejection L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION 1.2V Output Voltage from 1.5V Input Supply 1MHz VIN Supply Rejection
50 BIAS OUT VOUT = 1.2V I 45 COUT = 10μF 0.1μF 1μF OUT ≤ 300mA Li-Ion 1.5V HIGH LTC3025 80.6k 40 OR EFFICIENCY 1.5V 3-CELL DC/DC IN ADJ 35 COUT = 1μF NiMH BUCK 0.1μF 40.2k 30 OFF ON SHDN GND 25 3025 TA01 20 REJECTION (dB) 15 10 5 BIAS = 3.6V IOUT = 100mA VOUT = 1.2V IOUT = 300mA 0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 VIN (V) 3025 TA01b 3025fd 1