LT3070 datesheet
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2010-07-03
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Electrical Specifications Subject to Change
LT3070
1
3070p
APPLICATIONS
n
FPGA and DSP Supplies
n
ASIC and Microprocessor Supplies
n
Servers and Storage Devices
n
Post Buck Regulation and Supply Isolation
TYPICAL APPLICATION
DESCRIPTION
5A, Low Noise,
Programmable Output,
85mV Dropout
Linear Regulator
The LT
®
3070 is a low voltage, UltraFast™ transient re-
sponse linear regulator. The device supplies up to 5A of
output current with a typical dropout voltage of 85mV.
A 0.01μF reference bypass capacitor decreases output
voltage noise to 25μV
RMS
. The LT3070’s high bandwidth
permits the use of low ESR ceramic capacitors, saving
bulk capacitance and cost. The LT3070’s features make
it ideal for high performance FPGAs, microprocessors or
sensitive communication supply applications.
Output voltage is digitally selectable in 50mV increments
over a 0.8V to 1.8V range. A margining function allows the
user to tolerance system output voltage in increments of
±1%, ±3% or ±5%. The IC incorporates a unique tracking
function to control a buck regulator powering the LT3070’s
input. This tracking function drives the buck regulator to
maintain the LT3070’s input voltage to V
OUT
+ 300mV,
minimizing power dissipation.
Internal protection includes UVLO, reverse-current protec-
tion, precision current limiting with power foldback and
thermal shutdown. The LT3070 regulator is available in a
thermally enhanced 28-lead, 4mm × 5mm QFN package.
0.9V, 5A Regulator
FEATURES
n
Output Current: 5A
n
Dropout Voltage: 85mV Typical
n
Digitally Programmable V
OUT
: 0.8V to 1.8V
n
Digital Output Margining: ±1%, ±3% or ±5%
n
Low Output Noise: 25μV
RMS
(10Hz to 100kHz)
n
Parallelable: Use Two for a 10A Output
n
Precision Current Limit: ±10%
n
±1% Accuracy Over Line, Load and Temperature
n
Stable with Low ESR Ceramic Output Capacitors
(15μF Minimum)
n
High Frequency PSRR: 35dB at 1MHz
n
Enable Function Turns Output On/Off
n
VIOC Pin Controls Buck Converter to Maintain Low
Power Dissipation and Optimize Effi ciency
n
PWRGD/UVLO Flag
n
Current Limit Foldback Protection
n
Thermal Shutdown
n
28-Lead (4mm × 5mm) QFN Package
Dropout Voltage
XXX
0
XXX
2
3
40
LTXXXX • TPCXX
1
0
10
20
PLACE HOLDER
30
4
BIAS
50k
LT3070
IN
EN
V
O0
V
O1
330μF
2.2μF
2.2μF
0.01μF1nF
4.7μF
3070 TA01a
10μF
PWRGD
V
OUT
0.9V
5A
V
O2
MARGSEL
MARGTOL
VIOC
SENSE
OUT
V
BIAS
2.2V TO 3.6V
V
IN
1.2V
PWRGD
REF/BYP
GND
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. UltraFast is a trade mark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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