LTM4709
Triple 3A, Ultralow Noise, High PSRR, Ultrafast µModule
Linear Regulator with Configurable Output Array
FEATURES
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DESCRIPTION
Linear Regulator µModule® with Triple 3A Output
The LTM®4709 is a low voltage, triple 3A µModule
linear regulator offering a high power supply rejection
ratio (PSRR), ultralow noise, and ultrafast transient
response. The µModule regulator includes low dropout
linearregulators(LDO),capacitors,andresistors.Operating
over an input voltage range of 0.6V to 5.5V, the LTM4709
supports an output voltage range of 0.5V to 4.2V for
triple 3A channels with a typical dropout voltage of 45mV.
The output voltage is digitally configurable in 50mV
increments from 0.5V to 1.2V; 100mV increments from
1.2V to 1.8V; and discrete levels at 2V, 2.5V, 3V, 3.3V,
and 4.2V. A precision current monitor provides accurate
current monitoring for the energy management system
and current limit. The LTM4709 is ideal for RF communi-
cation, noise-sensitive instrumentation, post-regulation
for switching regulators, high-performance FPGAs, and
microprocessors. Only input, output, and bias ceramic
capacitors are needed for its application.
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Input Voltage: 0.6V to 5.5V
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Configurable Output Voltage: 0.5V to 4.2V
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Ultralow RMS Noise: 1.3μV
(10Hz to 100kHz)
RMS
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High Frequency PSRR: 51dB at 1MHz
Low Dropout Voltage: 45mV Typical at 3A
Ultrafast Transient Response
50% Smaller Than Discrete Solutions
1.5% Output Voltage Regulation Over Line, Load,
and Temperature
2.4% Precision Current Monitor Accuracy at 3A
Stable with Ceramic Output Capacitors (10μF Minimum)
Parallel Multiple Devices for Higher Current
PG Flag, UVLO, Overcurrent and
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Overtemperature Protection
150°C Rated Available
6mm × 12mm × 1.92mm BGA Package
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APPLICATIONS
Fault protection features include UVLO, power good, over-
current, and overtemperature protection. The LTM4709 is
offered in 6mm × 12mm × 1.92mm, 98-pin BGA package
with 0.8mm ball pitch.
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RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
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High Speed/High Precision Data Converter
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FPGA, DSP, and Microprocessor Power Supplies
High-Speed Servers and Storage Devices
Medical and Healthcare
Very-Low-Noise Instrumentation
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Configurable Output Array
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3A
3A
3A
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6A
3A
9A
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Post-Regulation for Switching Supplies
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
Triple 3A µModule Regulator
VIN PSRR at 1VOUT and 3A
120
3.3V
BIAS
1.3V
BIAS1,2,3
LTM4709
GND
0.8V
OUT1
22μF
V
V
V
V
OUT1
IN
IN1
IN2
IN3
100
80
10μF
× 3
V
OUTS1
EN1,2,3
IMONR1
PGR1,2,3
V
OUT2
V
O10
1V
OUT2
60
22μF
V
O11
V
O12
V
O20
V
O21
V
O22
V
O30
V
O31
V
O32
V
OUTS2
PINS NOT USED:
PG1,2,3
IMONR2
40
VIOC1,
IMON1,2,3,
V
OUT3
0.9V
OUT3
22μF
V
REF1,2,3
20
V
OUTS3
V
= 1.3V, C
= 22μF
OUT
IN
IMONR3
0
10
100
1k
10k 100k
1M
10M
4709 TA01a
FREQUENCY (Hz)
4709 TA1b
Rev. 0
1
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