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ADP1612ARMZ-R7 Datenblatt(PDF) 11 Page - Analog Devices

Teilenummer ADP1612ARMZ-R7
Bauteilbeschribung  650 kHz /1.3 MHz Step-Up PWM DC-to-DC Switching Converters
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ADP1612ARMZ-R7 Datenblatt(HTML) 11 Page - Analog Devices

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ADP1612/ADP1613
Rev. A | Page 11 of 28
THEORY OF OPERATION
FREQ
SW
PWM
COMPARATOR
UVLO
COMPARATOR
TSD
COMPARATOR
OSCILLATOR
S
R
Q
D
COMPARATOR
DREF
+
+
7
VIN
CURRENT
SENSING
5µA
DRIVER
BAND GAP
N1
BG
RESET
1.1M
AGND
VIN
UVLOREF
TSENSE
TREF
ERROR
AMPLIFIER
VBG
SOFT
START
2
1
5µA
VSS
RCOMP
CCOMP
COMP
SS
FB
CSS
R1
R2
CIN
VOUT
6
VIN
L1
D1
A
VOUT
COUT
5
3
4
GND
AGND
>1.6V
EN
ADP1612/AD1613
8
VIN
<0.3V
>1.6V
<0.3V
Figure 34. Block Diagram with Step-Up Regulator Application Circuit
The ADP1612/ADP1613 current-mode step-up switching
converters boost a 1.8 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 high 650 kHz/1.3 MHz switching
frequency allows for the use of tiny external components.
The switch current is monitored on a pulse-by-pulse basis to
limit it to 1.4 A typical (ADP1612) or 2.0 A typical (ADP1613).
CURRENT-MODE PWM OPERATION
The ADP1612/ADP1613 utilize a current-mode PWM control
scheme to regulate the output voltage over all load conditions.
The output voltage is monitored at FB through a resistive voltage
divider. The voltage at FB is compared to the internal 1.235 V
reference by the internal transconductance error amplifier to
create an error voltage at COMP. The switch current is internally
measured and added to the stabilizing ramp. The resulting sum
is compared to the error voltage at COMP to control the PWM
modulator. This current-mode regulation system allows fast
transient response, while maintaining a stable output voltage.
By selecting the proper resistor-capacitor network from COMP
to GND, the regulator response is optimized for a wide range of
input voltages, output voltages, and load conditions.
FREQUENCY SELECTION
The frequency of the ADP1612/ADP1613 is pin-selectable
to operate at either 650 kHz to optimize the regulator for high
efficiency or at 1.3 MHz for use with small external components.
If FREQ is left floating, the part defaults to 650 kHz. Connect
FREQ to GND for 650 kHz operation or connect FREQ to VIN
for 1.3 MHz operation. When connected to VIN for 1.3 MHz
operation, an additional 5 μA, typical, of quiescent current is
active. This current is turned off when the part is shutdown.
SOFT START
To prevent input inrush current to the converter when the part is
enabled, connect a capacitor from SS to GND to set the soft start
period. Once the ADP1612/ADP1613 are turned on, SS sources
5 μA, typical, to the soft start capacitor (CSS) until it reaches
1.2 V at startup. As the soft start capacitor charges, it limits the
peak current allowed by the part. By slowly charging the soft
start capacitor, the input current ramps slowly to prevent it
from overshooting excessively at startup. When the ADP1612/
ADP1613 are in shutdown mode (EN ≤ 0.3 V), a thermal shut-
down event occurs, or the input voltage is below the falling
undervoltage lockout voltage, SS is internally shorted to GND
to discharge the soft start capacitor.


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