Datasheet

LTM4615
9
4615fb
For more information www.linear.com/LTM4615
siMpliFieD block DiagraM
+
–
GND3
LDO_RHI
4.99k
GND3
GND3
GND
PGOOD3
4615 F01b
FB3
LDO_OUT
BOOST3
EN3
LDO_IN
0.4V
4.7µF
6.3V
V
IN
1.14V TO 3.5V
GND3
1V
4.7µF
6.3V
GND3
4.7µF
CONTROL
ENABLE
10k
R
FBLDO
3.32k
V
OUT
1V
1.5A10µF
5V BOOST
POWER GOOD
10µF
Figure 1. Simplified LTM4615 Block Diagram of Each Switching Regulator Channel and the VLDO
Decoupling requireMenTs
T
A
= 25°C. Use Figure 1 configuration for each channel.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
C
IN
External Input Capacitor Requirement
(V
IN
= 2.375V to 5.5V, V
OUT
= 1.5V)
I
OUT
= 4A 22 µF
C
OUT
External Output Capacitor Requirement
(V
IN
= 2.375V to 5.5V, V
OUT
= 1.5V)
I
OUT
= 4A 66 100 µF
LDO_IN LDO Input Capacitance I
OUT
= 1A 4.7 10 µF
LDO_OUT LDO Output Capacitance I
OUT
= 1A 10 µF
VLDO Block Diagram
Switching Regulator Block Diagram
V
IN
2.375V TO 5.5V
C
SS
1000pF
C
SSEXT
5.76k
R
FB
5.76k
TRACK
SUPPLY
4.99k
470pF
4.7µF
6.3V
4.7µF
6.3V
22µF
6.3V
×3
V
OUT
1.5V
4A
M1
0.47µH
M2
R
SS
1M
PGOOD
RUN/SS
TRACK
COMP
FB SW
V
OUT
V
IN
GND
4615 F01a
R
FBHI
4.99k
CONTROL, DRIVE
POWER FETS
INTERNAL
COMP
22µF
6.3V