LT3029_11 Datasheet, PDF (1/20 Pages) Linear Technology – Dual 500mA/500mA Low Dropout, Low Noise, Micropower Linear Regulator

LT3029
FEATURES
Dual 500mA/500mA
Low Dropout, Low Noise,
Micropower Linear Regulator
DESCRIPTION
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
APPLICATIONS
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}
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 20μV_RMS 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.
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.
TYPICAL APPLICATION
2.5V_IN to 1.5V/1.8V Application
V_IN
2.5V
IN1
OUT1
3.3μF
LT3029
10nF _113k
IN2
BYP1
1%
ADJ1
SHDN1
237k
1%
SHDN2 OUT2
BYP2
ADJ2
GND
10nF _54.9k
1%
237k
1%
3029 TA01
V_OUT1
1.8V
3.3μF ^500mA
3.3μF
V_OUT2
1.5V
500mA
Dropout Voltage vs Load Current
400
T_J = 25°C
350
300
250
200
150
100
50
0
0 50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
3029 TA01b
3029fa
1