ADP1614 AD [Analog Devices], ADP1614 Datasheet - Page 10

• Manufacturer Part Number: ADP1614
• Description: 650 kHz/1.3 MHz, 4 A, Step-Up
• Manufacturer: AD [Analog Devices]

ADP1614
THEORY OF OPERATION
The
boosts a 2.5 V to 5.5 V input voltage to an output voltage as
high as 20 V. The internal switch allows a high output current,
and the 650 kHz/1.3 MHz switching frequency allows the use of
ADP1614
C
R
C
R1
R2
COMP
COMP
IN
V
OUT
current-mode, step-up switching converter
C
V
SS
IN
COMP
FB
SS
10
2
1
V
V
CLRES
SS
BG
5.5µA
R
START
CL
VIN
SOFT
AMPLIFIER
9
ERROR
VIN
<0.3V
8
UVLO
3
T
1.1MΩ
>1.6V
SENSE
EN
Figure 25. Block Diagram with Step-Up Regulator Application Circuit
T
REF
REF
V
AGND
IN
COMPARATOR
COMPARATOR
PWM
COMPARATOR
TSD
UVLO
COMPARATOR
D
Rev. 0 | Page 10 of 16
RESET
ADP1614
OSCILLATOR
tiny external components. The switch current is monitored on a
pulse-by-pulse basis to limit the current to the value set by the
R
BG
CL
+
resistor on the CLRES pin.
+
BAND GAP
S
R
11
Q
EP
CURRENT
SENSING
L1
DRIVER
4
A
AGND
GND
5
N1
GND
6
7
SW
SW
D1
C
OUT
V
Data Sheet
OUT