Electrical Specifications Subject to Change
LT3070
5A, Low Noise,
Programmable Output,
85mV Dropout
Linear Regulator
FEATURES
DESCRIPTION
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
n
Output Current: 5A
n
Dropout Voltage: 85mV Typical
n
Digitally Programmable V : 0.8V to 1.8V
OUT
n
Digital Output Margining: 1ꢀ, ꢁꢀ or 5ꢀ
n
Low Output Noise: 25μV
(10Hz to 100kHz)
voltage noise to 25μV
. The LT3070’s high bandwidth
RMS
RMS
n
n
n
n
Parallelable: Use Two for a 10A Output
Precision Current Limit: 10ꢀ
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.
1ꢀ Accuracy Over Line, Load and Temperature
Stable with Low ESR Ceramic Output Capacitors
(15μF Minimum)
High Freꢁuency PSRR: 35dB at 1MHz
Enable Function Turns Output On/Off
VIOC Pin Controls Buck Converter to Maintain Low
Power Dissipation and Optimize Efficiency
PWRGD/UVLO Flag
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
1ꢀ, 3ꢀ or 5ꢀ. The IC incorporates a uniꢁue tracking
functiontocontrolabuckregulatorpoweringtheLT3070’s
input. This tracking function drives the buck regulator to
n
n
n
n
n
n
n
Current Limit Foldback Protection
Thermal Shutdown
maintain the LT3070’s input voltage to V
minimizing power dissipation.
+ 300mV,
OUT
28-Lead (4mm × 5mm) QFN Package
InternalprotectionincludesUVLO,reverse-currentprotec-
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.
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.
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
0.9V, 5A Regulator
50k
Dropout Voltage
V
BIAS
2.2V TO 3.6V
PWRGD
4
2.2μF
BIAS
V
IN
1.2V
3
IN
EN
V
PWRGD
SENSE
330μF
V
0.9V
5A
OUT
LT3070
OUT
O0
2
2.2μF
4.7μF
10μF
PLACE HOLDER
V
O1
V
O2
MARGSEL
MARGTOL
VIOC
1
0
REF/BYP
GND
1nF
0.01μF
3070 TA01a
0
20
30
40
10
XXX
LTXXXX • TPCXX
3070p
1