Datasheet
ADP1612/ADP1613 Data Sheet
Rev. D | Page 16 of 28
TYPICAL APPLICATION CIRCUITS
Both the ADP1612 and ADP1613 can be used in the application
circuits in this section.
The ADP1612 is geared toward applications requiring input
voltages as low as 1.8 V, where the ADP1613 is more suited for
applications needing the output power capabilities of a 2.0 A
switch. The primary differences are shown in Table 6.
Table 6. ADP1612/ADP1613 Differences
Parameter ADP1612 ADP1613
Current Limit 1.4 A 2.0 A
Input Voltage Range 1.8 V to 5.5 V 2.5 V to 5.5 V
The Step-Up Regulator Circuit Examples section recommends
component values for several common input, output, and load
conditions. The equations in the Applications Information
section can be used to select components for alternate
configurations.
STEP-UP REGULATOR
The circuit in Figure 36 shows the ADP1612/ADP1613 in a
basic step-up configuration.
ADP1612/
ADP1613
6
3
7
8
5
2
1
4
VIN
EN
FREQ
SS
SW
FB
COMP
GND
ON
OFF
1.3MHz
650kHz
(DEFAULT)
V
OUT
V
IN
L1
C
IN
C
SS
C
OUT
C
COMP
R
COMP
R1
R2
D1
06772-005
Figure 36. Step-Up Regulator
The modified step-up circuit in Figure 37 incorporates true
shutdown capability advantageous for battery-powered applica-
tions requiring low standby current. Driving the EN pin below
0.3 V shuts down the ADP1612/ADP1613 and completely
disconnects the input from the output.
ADP1612/
ADP1613
6
3
7
8
5
2
1
4
VIN
EN
FREQ
SS
SW
FB
COMP
GND
1.3MHz
650kHz
(DEFAULT)
V
OUT
L1
C
IN
C
SS
C
OUT
C
COMP
R
COMP
R1
R2
D1
06772-006
V
IN
R3
10kΩ
NTGD1100L
Q1
A
B
Q1
ON
OFF
Figure 37. Step-Up Regulator with True Shutdown
STEP-UP REGULATOR CIRCUIT EXAMPLES
ADP1612 Step-Up Regulator
06772-040
ADP1612
6
3
7
8
5
2
1
4
VIN
EN
FREQ
SS
SW
FB
COMP
GND
ON
OFF
V
OUT
= 5VV
IN
= 1.8V TO 4.2V
L1
4.7µH
C
SS
33nF
C
OUT
10µF
C
COMP
3300pF
R
COMP
6.8kΩ
R1
30kΩ
R2
10kΩ
D1
3A, 40V
C
IN
10µF
L1: DO3316P-472ML
D1: MBRA340T3G
R1: RC0805FR-0730KL
R2: CRCW080510K0FKEA
R
COMP
: RC0805JR-076K8L
C
COMP
: ECJ-2VB1H332K
C
IN
: GRM21BR61C106KE15L
C
OUT
: GRM32DR71E106KA12L
C
SS
: ECJ-2VB1H333K
Figure 38. ADP1612 Step-Up Regulator Configuration
V
OUT
= 5 V, f
SW
= 650 kHz
100
90
80
70
60
50
40
30
1 10 100 1k 10k
LOAD CURRENT (mA)
EFFICIENCY (%)
06772-041
V
OUT
= 5V
f
SW
= 650kHz
T
A
= 25°C
V
IN
= 1.8V
V
IN
= 2.7V
V
IN
= 3.3V
V
IN
= 4.2V
ADP1612
Figure 39. ADP1612 Efficiency vs. Load Current
V
OUT
= 5 V, f
SW
= 650 kHz
06772-042
V
OUT
= 5V
f
SW
= 650kHz
T
TIME (100µs/DIV)
OUTPUT VOLTAGE (50mV/DIV)
AC-COUPLED
LOAD CURRENT (50mA/DIV)
Figure 40. ADP1612 50 mA to 150 mA Load Transient (V
IN
= 3.3 V)
V
OUT
= 5 V, f
SW
= 650 kHz