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LT3028 Datasheet(PDF) 1 Page - Linear Technology

Part # LT3028
Description  Dual 500mA/500mA Low Dropout, Low Noise, Micropower Linear Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3028 Datasheet(HTML) 1 Page - Linear Technology

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LT3029
1
3029fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual 500mA/500mA
Low Dropout, Low Noise,
Micropower Linear Regulator
The LT®3029 is a dual, micropower, low noise, low drop-
out linear regulator. The device operates either with a
common input supply or independent input supplies for
each channel, over an input voltage range of 1.8V to 20V.
Each output supplies up to 500mA of output current with
a typical dropout voltage of 300mV. Quiescent current is
well controlled in dropout. With an external 10nF bypass
capacitor, output noise is only 20μVRMS over a 10Hz to
100kHz bandwidth. Designed for use in battery-powered
systems, the low 55μA quiescent current per channel makes
it an ideal choice. In shutdown, quiescent current drops to
less than 1μA. Shutdown control is independent for each
channel, allowing for flexible power management.
The LT3029 optimizes stability and transient response with
low ESR ceramic output capacitors, requiring a minimum
of only 3.3μF. The regulator does not require the addition
of ESR, as is common with other regulators.
Internal circuitry provides reverse-battery protection,
reverse-current protection, current limiting with foldback
and thermal shutdown. The device is available as an
adjustable output voltage device with a 1.215V reference
voltage. The LT3029 is offered in the thermally enhanced
16-lead MSOP and 16-lead, low profile (4mm
× 3mm ×
0.75mm) DFN packages.
2.5VIN to 1.5V/1.8V Application
n Output Current: 500mA per Channel
n Low Dropout Voltage: 300mV
n Low Noise: 20μVRMS (10Hz to 100kHz)
n Low Quiescent Current: 55μA per Channel
n Wide Input Voltage Range: 1.8V to 20V (Common or
Independent Input Supply)
n Adjustable Output: 1.215V Reference Voltage
n Very Low Quiescent Current in Shutdown: <1μA per
Channel
n Stable with 3.3μF Minimum Output Capacitor
n Stable with Ceramic, Tantalum or Aluminum
Electrolytic Capacitors
n Reverse-Battery and Reverse Output-to-Input
Protection
n Current Limit with Foldback and Thermal Shutdown
n Tracking/Sequencing Capability: Compatible with
LTC292X Power Supply Tracking ICs
n Thermally Enhanced 16-Lead MSOP and 16-Lead
(4mm
× 3mm) DFN Packages
n General Purpose Linear Regulator
n Battery-Powered Systems
n Microprocessor Core/Logic Supplies
n Post Regulator for Switching Supplies
n Tracking/Sequencing Power Supplies
Dropout Voltage vs Load Current
VOUT1
1.8V
500mA
VOUT2
1.5V
500mA
237k
1%
10nF
3.3μF
113k
1%
3029 TA01
OUT2
ADJ2
BYP2
GND
237k
1%
10nF
3.3μF
54.9k
1%
OUT1
ADJ1
BYP1
LT3029
IN1
VIN
2.5V
3.3μF
SHDN1
IN2
SHDN2
OUTPUT CURRENT (mA)
0
400
350
300
250
200
150
100
50
0
400
3029 TA01b
100
200
300
500
50
450
150
250
350
TJ = 25°C
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.


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