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LTM4719 Datasheet(PDF) 24 Page - Analog Devices

Part # LTM4719
Description  42V Dual Input, Low Noise 150mA Step-Down μModule Regulator with I2C Battery Health Monitor
PDF  53 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTM4719 Datasheet(HTML) 24 Page - Analog Devices

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Data Sheet
LTM4719
analog.com
Rev. 0
24 of 53
THEORY OF OPERATION
The LTM4719 is a 42V dual input, 150mA synchronous buck µModule regulator with a battery health monitor
interfaced through I2C and an integrated linear regulator for a low noise output. It can support a seamless transition
between two separate input power sources when one input is lost. The fast, automatic switchover eliminates the
need for holdup capacitors and minimizes disturbances on the output rail. The LTM4719 can be used in a wide variety
of applications, including portable battery-powered devices, backup power, radio, healthcare, industrial automated
test equipment (ATE), and uninterruptible power supply. The LTM4719 has a built-in precision coulomb counter
accessible through an I2C interface. A discharge alarm threshold can be programmed. When the threshold voltage is
reached, an interrupt signal is generated at the IRQ pin. Battery voltage, battery impedance, and temperature can
be monitored and are accessible through I2C. The integrated ultralow quiescent current post-regulation linear
regulator in the LTM4719 draws only 560nA (typical) at no load and a 42µA of quiescent current (typical) at full load,
which makes LTM4719 ideal for battery-operated portable equipment. Fault protection features include input UVLO,
PG, current limit, and OV protection.
Block Diagram
Figure 14. LTM4719 Simplified Block Diagram
47µF
4.7µF
INTVCC EXTVCC VALID1
VALID2
VSET1
VSET2
VREF EN1
SW
VBUS
EN2
2.3VBUS
0.1µF
100kΩ
124kΩ
549kΩ
47.5kΩ
1MΩ
FB2
VOUT
PRIORITY
PG
RT
5V TO 42V
MAIN POWER
4.2V TO 5.5V
BATTERY
10µF
10µF
0.1µF
0.1µF
0.1µF
0.1µF
VIN1
SVIN1
SVIN2
DIODE
PWM/
SYNC
VINC
VOC
BUCK CONVERTER
0.1µF
0.1µF
IPK0
BATTERY
SoH
MONITOR
FB1
LDO
0.1µF
AVCC
DVCC
SDA
SCL
IPK1
IPK2
VINCOK
IRQ
BAL
GND
4.7µF
1.8VOUT
10µH
VIN2
LTM4719



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