AME5176 Synchronous Boost Converter With Low

AME
AME5176
n General Description
Synchronous Boost Converter
With Low Quiescent Current
n Typical Application
The AME5176 is a high efficiency synchronous boost
converter, which is based on a hysteretic controller topology using synchronous rectification to obtain maximum
efficiency at minimal quiescent currents. The converter
provides a power supply solution for products powered
by a variety of batteries such as single-cell, dual-cell,
tree-cell alkaline, NiCd or NiMH, or one-cell Li-Ion or Lipolymer battery.
The output voltage is internally programmable in a range
from 1.8V to 5V in increments of 0.1V. Moreover, the
converter can be switched off by an enable pin to minimize battery drain. The maximum average input current
is limited to 450mA for current limit.
n Features
l Very Low Start-up Voltage at 0.8V
l Output Voltage Range: 1.8V~5V in 0.1V
increments
l Output Voltage Accuracy ± 2%
l Output Currents up to 100mA
l No Schottky Diode Required
l Support Inductor of Multilayer Type
l Typical Shutdown Current Less than 0.7uA
l Typical Quiescent Current Less than 6.5uA
l Over Current Protection
l Over Temperature Protection
l Available in SOT-23, SOT-25 and SOT-89
Package
l RoHS Compliant and Halogen Free
n Functional Block Diagram
n Application
l All One-Cell, Two-Cell and Three-Cell Alkalie,
NiCd, NimH and Single-Cell Batteries
l Wireless Mouse
l Mobile-Applications
l Hand-Held Devices
Rev. B.01
1
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Pin Configuration
SOT-25
Top View
5
SOT-25
Top View
AME5176-AEVxxx
1. LX
2. GND
3. OUT
4. NC
5. EN
4
AME5176
1
2
3
5
AME5176-BEVxxx
1. EN
2. OUT
3. NC
4. GND
5. LX
4
AME5176
1
2
3
* Die Attach:
Conductive Epoxy
* Die Attach:
Non-Conductive Epoxy
SOT-23
Top View
SOT-89
Top View
AME5176
AME5176-AETxxx
1. GND
2. LX
3. OUT
1
* Die Attach:
Non-Conductive Epoxy
3
2
AME5176-AFTxxx
1. GND
2. OUT
3. LX
AME5176
1
2
* Die Attach:
Non-Conductive Epoxy
3
n Pin Description
Pin No.
SOT-25
2
SOT-89 SOT-23
Pin Name
Pin Description
A
B
1
5
3
2
LX
2
4
1
1
GND
Ground.
3
2
2
3
OUT
Output Voltage Pin.
4
3
N/A
N/A
NC
No connect Pin.
5
1
N/A
N/A
EN
Chip Enable (Active High).
Switch pin which connected to inductor.
Rev.B.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Ordering Information
AME5176 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration
Pin Configuration
A
(SOT-23)
A
(SOT-25)
B
(SOT-25)
A
(SOT-89)
Rev. B.01
1. GND
2. LX
3. OUT
1. LX
2. GND
3. OUT
4. NC
5. EN
Package
Type
Number of
Pins
E: SOT-2X
F: SOT-89
T: 3
V: 5
Output Voltage
180:
190:
200:
:
:
490:
500:
1.8V
1.9V
2.0V
:
:
4.9V
5.0V
1. EN
2. OUT
3. NC
4. GND
5. LX
1. GND
2. OUT
3. LX
3
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Absolute Maximum Ratings
Parameter
Maximum
Unit
Input Voltage
-0.3V to 7
V
LX Voltage
-0.3V to 7
V
Output Voltage
-0.3V to 7
V
EN Voltage
-0.3V to 7
V
Electrostatic Discharge (HBM)
2000
V
Electrostatic Discharge (MM)
200
V
Electrostatic Discharge (CDM)
1000
V
Junction Temperature
150
o
Storage Temperature
-65 to +150
o
C
C
n Recommended Operating Conditions
Parameter
Symbol
Rating
VIN
0.8V to 5.5
VOUT
1.8V to 5
Junction Temperature Range
TJ
-40 to +125
Ambient Temperature Range
TA
-40 to +85
Input Voltage
Output Voltage
4
Unit
V
o
C
Rev.B.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Thermal Information
Parameter
Package
SOT-23
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Die Attach
Symbol Maximum
Non-Conductive Epoxy
Non-Conductive Epoxy
SOT-25
140
θJ C
81
SOT-89
Non-Conductive Epoxy
46
SOT-23
Non-Conductive Epoxy
280
Non-Conductive Epoxy
θJA
260
SOT-89
Non-Conductive Epoxy
180
SOT-23
Non-Conductive Epoxy
400
SOT-89
mW
Conductive Epoxy
400
Non-Conductive Epoxy
550
Lead Temperature ( soldering 10 sec)**
C/W
400
PD
SOT-25
o
280
Conductive Epoxy
Non-Conductive Epoxy
Internal Power Dissipation
140
Conductive Epoxy
SOT-25
Unit
260
o
C
* Measure θJC on backside center of molding compound if IC has no tab.
** MIL-STD-202G 210F
Rev. B.01
5
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Electrical Specifications
TA = 25oC, unless otherwise noted.
Parameter
Symbol
Test Condition
VSTART-UP
IOUT=1mA, VIN :02V
Hold-on Voltage(V)
VHOLD
IOUT=1mA, VIN :2V0V
Output Accuracy
∆VOUT
Min
Typ
Max
Units
DC/DC Stage
Minimum Input Voltage
At Startup
0.8
-2
V
0.7
V
2
%
V OUT=1.8V
1.8
V
V OUT=2.1V
2.1
V
V OUT=2.2V
2.2
V
V OUT=2.7V
2.7
V
V OUT=3.0V
3
V
V OUT=3.3V
3.3
V
V OUT=5.0V
5
V
VOUT x 1.2
6.5
Rectifying Switch on Resistance RDS(ON)_P
V OUT=3.3V
1
Ω
Main Switch on Resistance
V OUT=3.3V
1
Ω
Output Voltage
Quiescent Current
∆VOUT
IQ
10
µA
Power MOSFET
RDS(ON)_N
Enable Control (SOT-25 Only)
EN Logic-High Voltage
VIH
EN Logic-Low Voltage
V IL
EN Input Current
IEN
Shutdown Current
ISD
0.8
Clamp on GND or VOUT
VEN =0V, VIN =1.2V
IOUT=0mA
V
0.1
0.4
V
1
µA
0.7
µA
450
mA
Protection
Switch Current Limit
ISW
V OUT=3.3V
NMOS Leakage
Ileakage_N
V OUT=3.3V
1
µA
PMOS Leakage
Ileakage_P
V OUT=3.3V
1
µA
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
6
TSD
150
o
C
∆TSD
20
o
C
Rev.B.01
AME
AME5176
n Detailed Description
The AME5176 is a high efficiency synchronous boost
converter, which is based on a hysteretic current controller topology using synchronous rectification to obtain
maximum efficiency at minimal quiescent current condition. The converter allows the use of low cost chip inductor (Support Inductor of Multilayer Type) and small ceramic input and output capacitors total only three external components.
Enable Function
The AME5176 has a dedicated enable pin. The device
is enabled when pull the EN above 0.8V. Furthermore,
the device is disabled when pull the EN below 0.4V.
Over Current Limit
The AME5176 provide the current limit protection function. When inductor current reaches the internal switch
current limit threshold, the internal switch will be turned
off. When the over current state is eliminated, the IC
resumes its nornal operation.
Synchronous Boost Converter
With Low Quiescent Current
n Application Information
Inductor
The Inductor is required to supply energy to the load
while being driven by switched high side MOSFET.
Choose inductance that will affect the period proportional
to inductance. Therefore, choosing greater inductance
can improve system efficiency since the switching frequency is decreased to reduce system switching losses.
Finally, the choice of which style inductor to utilize mainly
depends on the price vs. size requirements and any EMI
constraints. Suggesting the inductance range is from
10µH to 33µH.
Input Capacitor
Use low ESR capacitors for the best performance.
When using ceramic capacitors make sure that they have
enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input terminal. Furthermore, an input capacitor improves EMI problems in the
power supply circuit.
Output Capacitor
Over Temperature Protection
When the junction temperature exceeds 150oC, the over
temperature protection circuit turns off the internal switch,
the converter will not turn back on until the device has
cooled approximately 20 degrees. For normal operation,
the junction temperature cannot exceed TJ=+125oC.
The output capacitor is required to place enough capacitance to improve the system efficiency and output
ripple. Ceramic capacitors are recommended. Low ESR
capacitors are preferred to keep the output voltage ripple
low. Furthermore, the output capacitance can be estimated by:
COUT ≥
L
2
Where L is the inductance. The characteristics of the
output capacitor also affect the stability transient behavior of the regulation system. The AME5176 can be optimized for a wide range of capacitance and ESR values,
such as solid tantalum, ceramic, and aluminum electrolytic capacitors.
Rev. B.01
7
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
Component Reference
Manufacturer
Part Number
Value
C1
Murata
GRM188R60JA106ME47
10µF, 6.3V, X5R
C2
Murata
GRM188R60JA106ME47
10µF, 6.3V, X5R
L1
Murata
LQH43PN100M26
10µH
D1
ON semi
MBR130T1G
1A, 30V
Table 1. List of Components
D1(Opt.)
VIN
L1
10µH
LX
C1
10µF
OUT
GND
VOUT
C2
10µF
Typical Application Circuit
Layout Considerations
PCB Layout is important to achieve stable operation for switching power system at the high switching frequencies
and high peak currents conditions. For best results, follow these guidelines:
(1) The input capacitor placed as close and wide as possible to VIN and GND pins of the IC is recommended.
(2) The output capacitor placed as close and wide as possible to VOUT and GND pins of the IC is recommended.
(3) Place Lx Pin as short and wide to the IC as possible.
PCB Top View
8
PCB Bottom View
Rev.B.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Characterization Curve
Quiescent Current vs. Temperature
Efficiency vs. Output Current
100
6.5
VIN =1.5V , V OUT=2.7V , L=10µH
Quiescent Current (uA)
90
Efficiency (%)
80
70
60
50
40
30
20
VOUT=2.1V
6
5.5
5
4.5
4
3.5
10
0
0.00010
0. 00100
0.01000
0.10000
3
-50
-25
0
25
50
75
100
125
Temperature (oC)
Output Current (A)
Output Voltage vs. Temperature
CCM Output Voltage Ripple
2.80
V IN =1.2V , VOUT=3.3V , IOUT=27mA
VOUT=2.7V
Output Voltage (V)
2.75
VOUT
(20mV/div)
2.70
2.65
2.60
2.55
-50
IL
(50mA/div)
-25
0
25
50
75
100
125
2.0µ
µs/div
Temperature ( oC)
Power ON from Input Voltage
DCM Output Voltage Ripple
VIN =1.5V , VOUT=2.7V
IOUT=1.5mA
VOUT
(1.0V/div)
VIN
(1.0V/div)
IL
(100mA/div)
Rev. B.01
2.0ms/div
9
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Tape and Reel Dimension
SOT-23
P0
W
AME
AME
PIN 1
P
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Pitch (P0)
Part Per Full Reel
Reel Size
SOT-23
8.0±0.1 mm
4.0±0.1 mm
4.0±0.1 mm
3000pcs
180±1 mm
SOT-25
P0
W
AME
AME
PIN 1
P
Carrier Tape, Number of Components Per Reel and Reel Size
10
Package
Carrier Width (W)
Pitch (P)
Pitch (P0)
Part Per Full Reel
Reel Size
SOT-25
8.0±0.1 mm
4.0±0.1 mm
4.0±0.1 mm
3000pcs
180±1 mm
Rev.B.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Tape and Reel Dimension (Contd.)
SOT-89
P0
W
AME
AME
PIN1
P
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Pitch (P0)
Part Per Full Reel
Reel Size
SOT-89
12.0±0.1 mm
8.0±0.1 mm
4.0±0.1 mm
1000pcs
180±1 mm
Rev. B.01
11
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Package Dimension
SOT-23
SYMBOLS
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
A
0.90
1.40
0.0354
0.0551
A1
0.00
0.15
0.0000
0.0059
b
0.30
0.50
0.0118
0.0197
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
1.90 BSC
e
H
2.40
3.00
0.0945
0.35BSC
L
θ1
0.0748 BSC
0
o
0.1181
0.0138 BSC
10
o
0
o
10o
n Lead Pattern Drawing
2.40 BSC
1.00 BSC
0.80 BSC
Note:
1. Lead pattern unit description:
BSC: Basic. Represents theoretical exact dimension or
dimension target.
2. Dimensions in Millimeters.
3. General tolerance +0.05mm unless otherwise specified.
1.90 BSC
12
Rev.B.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Package Dimension (Contd.)
SOT-25
SYMBOLS
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
A
0.90
1.30
0.0354
0.0512
A1
0.00
0.15
0.0000
0.0059
b
0.30
0.55
0.0118
0.0217
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
e
H
1.90 BSC
2.60
L
θ1
S1
0.0748 BSC
3.00
0.37 BSC
0
o
10
0.95 BSC
0.1024
0.1181
0.0146 BSC
o
0o
10o
0.0374 BSC
n Lead Pattern Drawing
0.70 BSC
1.00 BSC
Note:
1. Lead pattern unit description:
2.40 BSC
BSC: Basic. Represents theoretical exact dimension or
0.95 BSC
dimension target.
2. Dimensions in Millimeters.
3. General tolerance +0.05mm unless otherwise specified.
0.95 BSC
1.90 BSC
Rev. B.01
13
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5176
n Package Dimension (Contd.)
SOT-89
TOP VIEW
SIDE VIEW
BOTTOM VIEW
SYMBOLS
D
D2
H
D1
A
E
10'
A1
PIN 1
C
S1
e
INCHES
MIN
MAX
MIN
MAX
1.39
1.60
0.0547
0.0630
A1
E2
3'
MILLIMETERS
0.8 REF
0.0315 REF
C
0.35
0.44
0.0138
0.0173
D
4.39
4.60
0.1728
0.1811
D1
1.35
1.83
0.0531
0.0720
E
2.28
2.60
0.0898
0.1024
I
0.32
0.56
0.0126
0.0220
e
3.00 REF
0.1181 REF
0.70 REF
0.0276 REF
S1
1.50 REF
0.0591 REF
FRONT VIEW
E2
2.05
2.60
0.0807
0.1024
D2
1.50
1.85
0.0591
0.0728
A
H
I
n Lead Pattern Drawing
2.600 BSC
1.400 BSC
Note:
4.400 BSC
3.200 BSC
1. Lead pattern unit description:
BSC: Basic. Represents theoretical exact dimension or
dimension target.
2. Dimensions in Millimeters.
3. General tolerance +0.05mm unless otherwise specified.
2.800 BSC
1.900 BSC
45oC
1.800 BSC
1.600 BSC
3.000 BSC
14
Rev.B.01
www.ame.com.tw
E-Mail: sales@ame.com.tw
Life Support Policy:
These products of AME, Inc. are not authorized for use as critical components in life-support
devices or systems, without the express written approval of the president
of AME, Inc.
AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and
advises its customers to obtain the latest version of relevant information.
 AME, Inc. , November 2014
Document: A015A-DS5176-B.01
Corporate Headquarter
AME, Inc.
8F, 12, WenHu St., Nei-Hu
Taipei 114, Taiwan .
Tel: 886 2 2627-8687
Fax: 886 2 2659-2989