ltm4615 Linear Technology Corporation, ltm4615 Datasheet - Page 9

• Manufacturer Part Number: ltm4615
• Description: Triple Output, Low Voltage Dc/dc ?module Regulator
• Manufacturer: Linear Technology Corporation

SIMPLIFIED BLOCK DIAGRAM
DECOUPLING REQUIREMENTS
SYMBOL
C
C
LDO_IN
LDO_OUT
IN
OUT
SUPPLY
TRACK
4.99k
1.14V TO 3.5V
PARAMETER
External Input Capacitor Requirement
(V
External Output Capacitor Requirement
(V
LDO Input Capacitance
LDO Output Capacitance
Figure 1. Simplifi ed LTM4615 Block Diagram of Each Switching Regulator Channel and the VLDO
IN
IN
= 2.375V to 5.5V, V
= 2.375V to 5.5V, V
5.76k
C
SSEXT
V
IN
PGOOD
RUN/SS
TRACK
COMP
10μF
INTERNAL
COMP
LDO_IN
EN3
OUT
OUT
R
1M
SS
C
1000pF
SS
= 1.5V)
= 1.5V)
ENABLE
GND3
GND3
GND
4.7μF
6.3V
Switching Regulator Block Diagram
CONTROL, DRIVE
POWER FETS
FB
R
5.76k
FB
0.4V
CONDITIONS
I
I
I
I
OUT
OUT
OUT
OUT
VLDO Block Diagram
T
A
= 4A
= 4A
= 1A
= 1A
+
–
GND3
= 25°C. Use Figure 1 confi guration for each channel.
POWER GOOD
5V BOOST
CONTROL
4.7μF
6.3V
M1
M2
LDO_RHI
4.99k
SW
470pF
L
C2
GND3
GND3
LDO_OUT
PGOOD3
BOOST3
4.7μF
4.7μF
6.3V
R1
4.99k
4615 F01b
FB3
1V
4.7μF
6.3V
V
GND
4615 F01a
10k
OUT
V
IN
10μF
MIN
4.7
22
66
10
R
3.32k
V
1V
1.5A
FBLDO
OUT
22μF
6.3V
22μF
6.3V
3
TYP
100
10
V
1.5V
4A
V
2.375V TO 5.5V
LTM4615
OUT
IN
MAX
UNITS
9
4615f
μF
μF
μF
μF