AIC1610/AIC1611
High Efficiency Synchronous Step-Up DC/DC
Converter
FEATURES
High Efficiency (93% when VIN=2.4V,
VOUT=3.3V, IOUT=200mA)
Output Current up to 500mA. (AIC1610 at
VIN=2.4V and VOUT=3.3V)
20µA Quiescent Supply Current.
Power-Saving Shutdown Mode (0.1µA typical).
Internal Synchronous Rectifier (No External Di-
ode Required).
On-Chip Low Battery Detector.
Low Battery Hysteresis
Space-Saving Package: MSOP-8
APPLICATIONS
Palmtop & Notebook Computers.
PDAs
Wireless Phones
Pocket Organizers.
Digital Cameras.
Hand-Held Devices with 1 to 3-Cell of
NiMH/NiCd Batteries.
DESCRIPTION
The AIC1610/AIC1611 are high efficiency
step up DC-DC converters. The start-up volt-
age is as low as 0.8V with operating voltage
down to 0.7V. Simply consuming 20µA of qui-
escent current. These devices offer a built-in
synchronous rectifier that reduces size and
cost by eliminating the need for an external
Schottky diode and improves overall effi-
ciency by minimizing losses.
The switching frequency can range up to
500KHz depending on the load and input volt-
age. The output voltage can be easily set by
two external resistors from 1.8V to 5.5V,
connecting FB to OUT to get 3.3V, or con-
necting to GND to get 5.0V. The peak current
of the internal switch is fixed at 1.0A (AIC1610)
or 0.65A (AIC1611) for design flexibility.
TYPICAL APPLICATION CIRCUIT
Output 3.3V, 5.0V
or Adj. (1.8V to 5.5V)
up to 300mA
Low-battery
Detect Out
AIC1610
AIC1611
OUT
FB
GND
REF
LBO
SHDN LX
LBI
+
ON OFF
+
Low Battery
Detection
0.1µF
VIN
22µH
47µF
47µF
Analog Integrations Corporation Si-Soft Research Center DS-1610P-03 010405
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1
AIC1610/AIC1611
ORDERING INFORMATION
A
IC1610XX XX
A
IC1611XX XX
PIN CONFIGURATION
TOP VIEW
GND
1
3
4
2
8
6
5
7
OUT
LBI
LBO
REF
LX
SHDN
FB
Example: AIC1610COTR
In MSOP-8 Package & Taping &
Reel Packing Type
AIC1610POTR
In MSOP-8 Lead Free Package &
Taping & Reel Packing Type
PACKING TYPE
TR: TAPE & REEL
PACKAGING TYPE
O: MSOP-8
C: COMMERCIAL
P: LEAD FREE COMMERCIAL
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (OUT to GND) 8.0V
Switch Voltage (LX to GND) VOUT+ 0.3V
, LBO to GND 6.0V
SHDN
LBI, REF, FB, to GND VOUT+0.3V
Switch Current (LX) -1.5A to +1.5A
Output Current (OUT) -1.5A to +1.5A
Operating Temperature Range -40°C ~ +85°C
Maximum Junction Temperature 125°C
Storage Temperature Range -65°C ~150°C
Lead Temperature (Soldering 10 Sec.) 260°C
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
Refer to Typical Application Circuit.
2
AIC1610/AIC1611
ELECTRICAL CHARACTERISTICS (VIN=2.0V, VOUT=3.3V, FB=VOUT, TA=25°C, unless
otherwise specified.) (Note1)
PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT
Minimum Input Voltage 0.7 V
Operating Voltage 1.1 5.5 V
Start-Up Voltage RL=3KΩ (Note2) 0.8 1.1 V
Start-Up Voltage Tempco -2 mV/°C
Output Voltage Range VIN<VOUT 1.8 5.5
Output Voltage FB = VOUT 3.17 3.3 3.43 V
AIC1610 300 350 FB=OUT
(VOUT =3.3V) AIC1611 150 300
AIC1610 180 230
Steady State Output Current
(Note 3) FB=GND
(VOUT =5.0V) AIC1611 90 160
mA
Reference Voltage IREF= 0 1.199 1.23 1.261 V
Reference Voltage Tempco 0.024 mV/°C
Reference Load Regulation IREF = 0 to 100µA 10 30 mV
Reference Line Regulation VOUT = 1.8V to 5.5V 5 10 mV/V
FB , LBI Input Threshold 1.199 1.23 1.261 V
Internal switch On-Resistance ILX = 100mA 0.3 0.6 Ω
AIC1610 0.80 1.0 1.25
LX Switch Current Limit
AIC1611 0.50 0.65 0.85
A
LX Leakage Current VLX=0V~4V; VOUT=5.5V 0.05 1 µA
Operating Current into OUT
(Note 4) VFB = 1.4V , VOUT = 3.3V 20 35 µA
Shutdown Current into OUT SHDN = GND 0.1 1 µA
VOUT= 3.3V ,ILOAD = 200mA 90
Efficiency
VOUT = 2V ,ILOAD = 1mA 85
%
3
AIC1610/AIC1611
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT
LX Switch On-Time VFB =1V , VOUT = 3.3V 2 4 7 µS
LX Switch Off-Time VFB =1V , VOUT = 3.3V 0.6 0.9 1.4 µS
FB Input Current VFB = 1.4V 0.03 50 nA
LBI Input Current VLBI = 1.4V 1 50 nA
SHDN Input Current VSHDN = 0 or VOUT 0.07 50 nA
LBO Low Output Voltage VLBI = 0, ISINK = 1mA 0.2 0.4 µA
LBO Off Leakage Current VLBO = 5.5V, VLBI = 5.5V 0.07 1
LBI Hystereisis 50 mV
VIL 0.2VOUT
SHDN Input Voltage
VIH 0.8VOUT
V
Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating tem-
perature range are assured by design, characterization and correlation with Statistical Quality Controls
(SQC).
Note 2: Start-up voltage operation is guaranteed without the addition of an external Schottky diode between the
input and output.
Note 3: Steady-state output current indicates that the device maintains output voltage regulation under load.
Note 4: Device is bootstrapped (power to the IC comes from OUT). This correlates directly with the actual
battery supply.
4
AIC1610/AIC1611
TYPICAL PERFORMANCE CHARACTERISTICS
Input Battery Current (µA)
Input battery voltage (V)
Fig. 1 No-Load Battery Current vs. Input Battery
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
0
20
40
60
80
100
120
140
160
VOUT=5V (FB=GND)
VOUT=3.3V (FB=OUT)
Shutdown Current Current (µA)
Supply Voltage (V)
Fig. 2 Shutdown Current vs. Supply Voltage
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
0.0
0.1
0.2
0.3
0.4
0.5
Fig. 3 Start-Up Voltage vs. Output Current
Start-U
p
Volta
g
e
(
V
)
0.01 0.1 1 10 100
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
VOUT=5.0V (FB=GND)
Output Current (mA)
VOUT=3.3V (FB=OUT)
Fig. 4 Turning Point between CCM & DCM
CCM/DCM Boundary Output Current (mA)
Input Voltage (V)
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0
50
100
150
200
250
300
350
400
VOUT=5.0V (FB=GND)
VOUT=3.3V (FB=OUT)
L=22µH
CIN=100µF
COUT=100µF
Fig. 5 Efficiency vs. Load Current (ref. to Fig.33)
Efficiency (%)
0.01 0.1 1 10 100 1000
0
10
20
30
40
50
60
70
80
90
100
VIN=3.6V
Output Current (mA)
VIN=2.4V
VIN=1.2V
A
IC1610 (ILIMIT =1A)
VOUT=5.0V (FB=GND)
Fig. 6 Ripple Voltage (ref. to Fig.33)
Ripple Voltage (mV)
Output Current (mA)
050 100 150 200 250 300 350 400 450 500 550 600 650
0
20
40
60
80
100
120
140
160
180
200
220
VIN=2.4V
VIN=1.2V
VOUT=5.0V
L=22µH
CIN=47µF
COUT=47µF
VIN=3.6V
A
IC1610 (ILIMIT =1A)
5
AIC1610/AIC1611
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. 7 Ripple Voltage (ref. to Fig.33)
Ripple Voltage (mV)
Output Current (mA)
0 100 200 300 400 500 600 700 800
0
40
80
120
160
200
240
VIN=2.4V
VOUT=5.0V
L=22µH
CIN=100µF
COUT=100µF
VIN=3.6V
VIN=1.2V
A
IC1610 (ILIMIT =1A)
Fig. 8 Efficiency vs. Load Current (ref. to Fig.33)
Efficiency (%)
Output Current (mA)
0.01 0.1 110 100 1000
0
10
20
30
40
50
60
70
80
90
100
VIN=3.6V
VIN=1.2V
VIN=2.4V
A
IC1611 (ILIMIT =0.65A)
VOUT=5.0V (FB=GND)
Fig. 9 Ripple Voltage (ref. to Fig.33)
Ripple Voltage (mV)
Output Current (mA)
0 50 100 150 200 250 300 350 400 450 500 550
0
20
40
60
80
100
120
140
160
VOUT=5.0V
L=22µH
CIN=47µF
COUT=47µF
VIN=3.6V
VIN=2.4V
VIN=1.2V
A
IC1611 (ILIMIT =0.65A)
Fig. 10 Ripple Voltage (ref. to Fig.33)
Ripple Voltage (mV)
Output Current (mA)
0100 200 300 400 500 600
0
20
40
60
80
100
120
VIN=2.4V
VIN=1.2V
VOUT=5.0V
L=22µH
CIN=100µF
COUT=100µF
VIN=3.6V
A
IC1611 (ILIMIT =0.65A)
Fig. 11 Efficiency vs. Load Current (ref. to Fig.32)
(V) Efficiency (%)
Output Current (mA)
0.01 0.1 1 10 100 1000
0
10
20
30
40
50
60
70
80
90
100
VIN=2.4V
VIN=1.2V
A
IC1610 (ILIMIT =1A)
VOUT=3.3V (FB=OUT)
Fig. 12 Ripple Voltage (ref. to Fig.32)
Ripple Voltage (mV)
Output Current (mA)
050 100 150 200 250 300 350 400 450 500 550 600
0
20
40
60
80
100
120
140
160
180
200
220
240
260
VIN=1.2V
VOUT=3.3V
L=22µH
CIN=47µF
COUT=47µF
VIN=2.4V
A
IC1610 (ILIMIT =1A)
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
6
AIC1610/AIC1611
Fig. 13 Ripple Voltage (ref. to Fig.32)
Ripple Voltage (mV)
Output Current (mA)
0 50 100 150 200 250 300 350 400 450 500 550
0
20
40
60
80
100
120
140
VOUT=3.3V
CIN=100µF
COUT=100µF
VIN=1.2V VIN=2.4V
A
IC1610 (ILIMIT =1A)
A
IC1610 (ILIMIT =1A)
Fig. 14 Efficiency vs. Load Current (ref. to Fig.32)
Efficiency (%)
Output Current (mA)
0.01 110 100 1000
0
10
20
30
40
50
60
70
80
90
100
VIN=1.2V VIN=2.4V
A
IC1611 (ILIMIT =0.65A)
VOUT=3.3V (FB=OUT)
Fig. 15 Ripple Voltage (ref. to Fig.32)
Ripple Voltage (mV)
Output Current (mA)
0 50 100 150 200 250 300 350 400 450 500
0
20
40
60
80
100
120
140
VOUT=3.3V
L=22µH
CIN=47µF
COUT=47µF
VIN=1.2V
VIN=2.4V
A
IC1611 (ILIMIT =0.65A)
Fig. 16 Ripple Voltage (ref. to Fig.32)
Ripple Voltage (mV)
Output Current (mA)
050 100 150 200 250 300 350 400 450 500
0
10
20
30
40
50
60
70
80
90
100
110
120
VOUT=3.3V
L=22µH
CIN=100µF
COUT=100µF
VIN=1.2V
VIN=2.4V
A
IC1611 (ILIMIT =0.65A)
Fig. 17 Reference Voltage vs. Temperature
Reference Voltage (V)
Temperature (°C)
-40 -20 0 20 40 60 80
1.20
1.21
1.22
1.23
1.24
1.25
1.26
IREF=0
Fig. 18 Switch Resistance vs. Temperature
Resistance (Ω)
Temperature (°C)
-60 -40 -20 020 40 60 80 100
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
P-Channel
N-Channel
VOUT=3.3V
ILX=100mA
7
AIC1610/AIC1611
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. 19 Maximum Output Current vs. Input Voltage
Maximum Output Current (mA)
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
0
100
200
300
400
500
600
700
800
Input Voltage (V)
A
IC1611 (ILIMIT=0.65A)
A
IC1610 (ILIMIT=1A)
VOUT=3.3V (FB=OUT)
Input Voltage (V)
Fig. 20 Maximum Output Current vs. Input Voltage
Maximum Output Current (mA)
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
0
100
200
300
400
500
600
700
800
900
A
IC1611 (ILIMIT=0.65A)
A
IC1610 (ILIMIT=1A)
VOUT=5.0V (FB=GND)
Fig. 21 Inductor Current vs. Output Voltage
ILIM
A
Output Voltage (V)
2.0 2.5 3.0 3.5 4.0 4.5 5.0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
A
IC1610 (ILIMIT=1A)
A
IC1611 (ILIMIT=0.65A)
Supply Voltage (V)
Fig. 22 Switching Frequency vs. Supply Voltage
Switching Frequency fosc (KHz)
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
0
20
40
60
80
100
120
140
160
IOUT=100mA
VOUT=5.0V
VOUT=3.3V
Switching Frequency Fosc (KHz)
Output Current (mA)
1 10 100 1000
0
20
40
60
80
100
120
140
160
180
200
220
VIN=2.4V
VOUT=3.3V
VIN=1.2V
VOUT=3.3V
VIN=2.4V
VOUT=5V
VIN=3.6V
VOUT=5V
Fig. 23 Switching Frequency vs. Output Current
VIN=2.4V
VOUT=3.3V
Fig. 24 LX Switching Waveform
8
AIC1610/AIC1611
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
VIN=2.4V
VOUT=3.3V
Loading=200mA
LX Pin Waveform
Inductor Current
VOUT AC Couple
Fig. 25 Heavy Load Waveform
Loading: 1mA ↔ 200mA
VIN=2.4V
VOUT=3.3V VOUT: AC Couple
Fig. 26 Load Transient Response
VIN=2.0V~3.0V
VOUT=3.3V, IOUT=100mA
VOUT
Fig. 27 Line Transient Response
VIN
Fig. 28 Exiting Shutdown
VOUT
V
SHDN
VOUT=3.3V
CIN=COUT=47µF
Fig. 29 Exiting Shutdown
VSHDN
VOUT
VOUT=3.3V
CIN=COUT=100µF
Fig. 30 Exiting Shutdown
VSHDN
VOUT
VOUT=5.0V
CIN=COUT=47µF
9
AIC1610/AIC1611
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. 31 Exiting Shutdown
VOUT
VSHDN
VOUT=5.0V
CIN=COUT=100µF
BLOCK DIAGRAM
+
-
+
-
+
-
+
-
+
47µF
47µF
C2
0.1µF
C1
VIN
C3
OUT
L
47µH
LX
FB
REF
GND
OUT
C4
0.1µF
Q2
Q1
LBO
LBI
SHDN
F/ F
Q
R
S
Reference
Voltage
Mirror
Max. On-Time
One Shot
Minimum
Off-Time
One Shot
10
AIC1610/AIC1611
PIN DESCRIPTIONS
PIN 1: FB- Connecting to OUT to get +3.3V
output, connecting to GND to get
+5.0V output, or using a resistor
network to set the output voltage
from +1.8V to +5.5V.
PIN 2: LBI- Low-battery comparator input. In-
ternally set at +1.23V to trip.
PIN 3: LBO- Open-drain low battery comparator
output. Output is low when VLBI is
<1.23V. LBO is high impedance
during shutdown.
PIN 4: REF- 1.23V reference voltage. Bypass
with a 0.1µF capacitor.
PIN 5: SHDN- Shutdown input. High=operating,
low=shutdown.
PIN 6: GND- Ground
PIN 7: LX- N-channel and P-channel power
MOSFET drain.
PIN 8: OUT- Power output. OUT provides boot-
strap power to the IC.
APPLICATION INFORMATION
Overview
AIC1610/AIC1611 series are high efficiency, step-
up DC-DC converters, designed to feature a built-in
synchronous rectifier, which reduces size and cost
by eliminating the need for an external Schottky di-
ode. The start-up voltage of AIC1610/AIC1611 is as
low as 0.8V and it operates with an input voltage
down to 0.7V. Quiescent supply current is only 20µA.
The internal P-MOSFET on-resistance is typically
0.3Ω to improve overall efficiency by minimizing AC
losses. The output voltage can be easily set by two
external resistors from 1.8V to 5.5V, connecting FB
to OUT to get 3.3V, or connecting to GND to get
5.0V. The peak current of the internal switch is fixed
at 1.0A (AIC1610) or 0.65A (AIC1611) for design
flexibility. The current limit of AIC1610 and AIC1611
are 1.0A and 0.65A respectively. The lower current
limit allows the use of a physically smaller inductor
in space-sensitive applications.
PFM Control Scheme
The key feature of the AIC1610 series is a unique
minimum-off-time, constant-on-time, current-limited,
pulse-frequency-modulation (PFM) control scheme
(see BLOCK DIAGRAM) with the ultra-low quies-
cent current. The peak current of the internal N-
MOSFET power switch can be fixed at 1.0A
(AIC1610) or 0.65A (AIC1611). The switch
frequency depends on either loading condition or
input voltage, and can range up to 500KHz. It is
governed by a pair of one-shots that set a minimum
off-time (1µS) and a maximum on-time (4µS).
Synchronous Rectification
Using the internal synchronous rectifier eliminates
the need for an external Schottky diode. Therefore,
the cost and board space are reduced. During the
cycle of off-time, P-MOSFET turns on and shunts N-
MOSFET. Due to the low turn-on resistance of
MOSFET, synchronous rectifier significantly im-
proves efficiency without an additional external
Schottky diode. Thus, the conversion efficiency can
be as high as 93%.
Reference Voltage
The reference voltage (REF) is nominally 1.23V for
excellent T.C. performance. In addition, REF pin
can source up to 100µA to external circuit with good
load regulation (<10mV). A bypass capacitor of
0.1µF is required for proper operation and good per-
11
AIC1610/AIC1611
η
×
−
−= L2
VV
tI
V
V
IINOUT
OFFLIM
OUT
IN
)MAX(OUT
……………………………………………………(2)
formance
Shutdown
The whole circuit is shutdown when SHDNV is low.
At shutdown mode, the current can flow from battery
to output due to body diode of the P-MOSFET. VOUT
falls to approximately Vin-0.6V and LX remains high
impedance. The capacitance and load at OUT de-
termine the rate at which VOUT decays. Shutdown
can be pulled as high as 6V. Regardless of the volt-
age at OUT.
where IOUT(MAX)=maximum output current in
amps
VIN=input voltage
L=inductor value in µH
η=efficiency (typically 0.9)
tOFF=LX switch’ off-time in µS
ILIM=1.0A or 0.65A
2. Capacitor Selection
Selecting the Output Voltage
The output ripple voltage relates with the peak
inductor current and the output capacitor ESR.
Besides output ripple voltage, the output ripple
current also needs to be concerned. A filter ca-
pacitor with low ESR is helpful to the efficiency
and steady state output current of AIC1610 se-
ries. Therefore NIPPON tantalum capacitor
MCM series with 100µF/6V is recommended. A
smaller capacitor (down to 47μF with higher
ESR) is acceptable for light loads or in applica-
tions that can tolerate higher output ripple.
VOUT can be simply set to 3.3V/5.0V by connecting
FB pin to OUT/GND due to the use of internal resis-
tor divider in the IC (Fig.32 and Fig.33). In order to
adjust output voltage, a resistor divider is connected
to VOUT, FB, GND (Fig.34). Vout can be calculated
by the following equation:
R5=R6 [(VOUT / VREF )-1] .....................................(1)
Where VREF =1.23V and VOUT ranging from 1.8V to
5.5V. The recommended R6 is 240KΩ.
Low-Battery Detection
3. PCB Layout and Grounding
AIC1610 series contains an on-chip comparator with
50mV internal hysteresis (REF, REF+50mV) for low
battery detection. If the voltage at LBI falls below the
internal reference voltage. LBO ( an open-drain out-
put) sinks current to GND.
Since AIC1610’s switching frequency can range
up to 500kHz, it makes AIC1610 become very
sensitive. So careful printed circuit layout is im-
portant for minimizing ground bounce and noise.
IC’s OUT pin should be as clear as possible.
And the GND pin should be placed close to the
ground plane. Keep the IC’s GND pin and the
ground leads of the input and output filter ca-
pacitors less than 0.2in (5mm) apart. In addition,
keep all connection to the FB and LX pins as
short as possible. In particular, when using ex-
ternal feedback resistors, locate them as close
to the FB as possible. To maximize output pow-
er and efficiency and minimize output ripple
voltage, use a ground plane and solder the IC’s
Component Selection
1. Inductor Selection
An inductor value of 22µH performs well in most
applications. The AIC1610 series also work with
inductors in the 10µH to 47µH range. An induc-
tor with higher peak inductor current tends a
higher output voltage ripple (IPEAK×output filter
capacitor ESR). The inductor’s DC resistance
significantly affects efficiency. We can calculate
the maximum output current as follows:
12
AIC1610/AIC1611
GND directly to the ground plane. Fig. 35 to 37
are the recommended layout diagrams.
Ripple Voltage Reduction
Two or three parallel output capacitors can sig-
nificantly improve output ripple voltage of
AIC1610/11. The addition of an extra input ca-
pacitor results in a stable output voltage. Fig.38
shows the application circuit with the above fea-
tures. Fig.39 to Fig.46 are the performances of
Fig. 38.
APPLICATION EXAMPLES
VOUT
VIN
R4
100KΩ
AIC1610/11
C3
C1
L
22µH 47µF
47µF
0.1µF
C
2
0.1µF
C4 LOW BATTERY
OUTPUT
R2
R1
LX OU
T
F
B
GND
REF
LBI
LB
O
SHD
N
L: TDK SLF7045T-22OMR90
C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER
VOUT
VIN
R4
100KΩ
AIC1610/11
C3
C1
47µF
47µF
0.1µF
C
2
0.1µF
C4 LOW BATTERY
OUTPUT
R2
R1 OU
T
F
B
GND
REF
LBI
LB
O
SHD
N
L
22µH
LX
L: TDK SLF7045T-22OMR90
C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER
Fig. 32. VOUT = 3.3V Application Circuit. Fig. 33. VOUT = 5.0V Application Circuit.
VOUT
VIN
100KΩ
R4
47µF
47µF
0.1µF
0.1µF
LOW BATTERY
OUTPUT
C2
C4
C3
C1
AIC1610/11 R6
R5
R2
R1
SHDN
L
X
FB
LBO
GND
REF
LBI
OUT
L
22µH
L: TDK SLF7045T-22OMR90
C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER
VOUT=VREF*(1+R5/R6)
Fig. 34 An Adjustable Output Application Circuit
13
AIC1610/AIC1611
APPLICATION EXAMPLES (Continued)
Fig. 35. Top layer Fig. 36. Bottom layer Fig. 37. Placement
R1
R2
R3 R4
100K
R6
VIN
LBI LBO
VIN
R5=0Ω, R6=open; for VOUT=3.3V
R5=open, R6=0Ω; for VOUT=5.0V
VOUT=1.23(1+R5/R6); for adjustable output voltage
L1 22
µ
H
C2
100
µ
F
C3
0.1
µ
F
R7
10k
+
C6
100
µ
F
C5
0.1
µ
F
R5
+
FB
1
LBI
2
LBO
3
REF
4SHDN 5
GND 6
L
X
7
OUT 8
AIC1610/11
C4
100nF
VOUT
ShutDown
C1
100
µ
F
+C7
100
µ
F
+
C8
100
µ
F
+
+
L1: TDK SLF7045T-22OMR90
C1~C2, C6~8: NIPPON Tantalum Capacitor 6MCM107MCTER
Fig. 38 AIC1610/11 application circuit with small ripple voltage.
Fig. 39 Efficiency (ref. to Fig.38)
Efficiency (%)
Output Current (mA)
0.01 0.1 1 10 100 1000
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
VOUT=5.0V
L=22µH
VIN=1.2V
VIN=2.4V
VIN=3.6V
A
IC1610 (ILIMIT =1A)
Fig. 40 Ripple Voltage (ref. to Fig.38)
Ripple Voltage (mV)
Output Current (mA)
0100 200 300 400 500 600 700
0
10
20
30
40
50
60
VOUT=5.0V
L=22µH
VIN=2.4V
VIN=3.6V
VIN=1.2V
A
IC1610 (ILIMIT =1A)
14
AIC1610/AIC1611
APPLICATION EXAMPLES (Continued)
Fig. 41 Efficiency (ref. to Fig.38)
Efficiency (%)
Output Current (mA)
60
0.01 0.1 1 10 100 1000
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
VOUT=5.0V
L=22µH
VIN=2.4V
VIN=3.6V
VIN=1.2V
A
IC1611 (ILIMIT =0.65A)
Fig. 42 Ripple Voltage (ref. to Fig.38)
Ripple Voltage (mV)
Output Current (mA)
0100 200 300 400 500
0
10
20
30
40
50
60
VOUT=5.0V
L=22µH
VIN=2.4V
VIN=3.6V
VIN=1.2V
A
IC1611 (ILIMIT =0.65A)
Fig. 43 Efficiency (ref. to Fig.38)
Efficiency (%)
Output Current (mA)
0.01 0.1 1 10 100 1000
40
45
50
55
60
65
70
75
80
85
90
95
100
VIN=2.4V
VIN=1.2V
VOUT=3.3V
L=22µH
A
IC1610 (ILIMIT =1A)
Fig. 44 Ripple Voltage (ref. to Fig.38)
Ripple Voltage (mV)
Output Current (mA)
050 100 150 200 250 300 350 400 450 500 550 600
0
5
10
15
20
25
30
35
40
45
50
VIN=2.4V
VIN=1.2V VOUT=3.3V
L=22µH
A
IC1610 (ILIMIT =1A)
Fig. 45 Efficiency (ref. to Fig.38)
Efficiency (%)
Output Current (mA)
0.01 0.1 1 10 100 1000
40
45
50
55
60
65
70
75
80
85
90
95
100
VOUT=3.3V
L=22µH
VIN=2.4V
VIN=1.2V
A
IC1611 (ILIMIT =0.65A)
Fig. 46 Ripple Voltage (ref. to Fig.38)
Ripple Voltage (mV)
Output Current (mA)
050 100 150 200 250 300 350 400
0
5
10
15
20
25
30
35
VOUT=3.3V
L=22µH
VIN=2.4V
VIN=1.2V
A
IC1611 (ILIMIT =0.65A)
15
AIC1610/AIC1611
PHYSICAL DIMENSION (unit: mm)
MSOP-8
A
A1 A2
0.25
SECTION A-A
BASE METAL
WITH PLATING
b
c
E
D
A
e
A
E1
SEE VIEW B
e
θ
L
c
E
E1
D
A2
b
A1
0.65 BSC
0.40
0°
0.70
6°
4.90 BSC
0.13
2.90
2.90
0.75
0.25
0.05
0.23
3.10
3.10
0.95
0.40
0.15
S
Y
M
B
O
L
A
MSOP-8
MILLIMETERS
MIN.
1.10
MAX.
θ
L
VIEW B
Note:
Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any cir-
cuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that
may result from its use. We reserve the right to change the circuitry and specifications without notice.
Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or
systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose
failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected
to result in a significant injury to the user.
16