AME5177 Synchronous Boost Converter With Low

AME
AME5177
n General Description
Synchronous Boost Converter
With Low Quiescent Current
n Typical Application
The AME5177 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 Functional Block Diagram
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-25, SOT-26 and DFN-6D
Package
l RoHS Compliant and Halogen Free
n Application
l All One-Cell, Two-Cell and Three-Cell Alkaline,
NiCd, NimH and Single-Cell Batteries
l Wireless Mouse
l Mobile-Applications
l Hand-Held Devices
Rev. A.01
1
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
n Pin Configuration
DFN-6D
(2mmx2mmx0.75mm)
Top View
1
6
2
5
3
4
SOT-25
Top View
AME5177-AVYxxx
1. NC
2. GND
3. EN
4. OUT
5. NC
6. LX
5
AME5177-AEVxxx
1. NC
2. GND
3. EN
4. OUT
5. LX
4
AME5177
1
2
3
* Die Attach:
Conductive Epoxy
* Die Attach:
Conductive Epoxy
SOT-26
Top View
SOT-26
Top View
6
5
AME5177-AEYxxx
1. NC
2. NC
3. GND
4. OUT
5. LX
6. EN
4
AME5177
1
2
3
6
5
AME5177-BEYxxx
1. LX
2. GND
3. EN
4. NC
5. VOUT
6. NC
4
AME5177
1
2
3
* Die Attach:
Non-Conductive Epoxy
* Die Attach:
Conductive Epoxy
n Pin Description
Pin No.
SOT-25
2
SOT-26
DFN
Pin Name
A
B
1
1, 2
4, 6
1, 5
NC
2
3
2
2
GND
3
6
3
3
EN
4
4
5
4
OUT
5
5
1
6
LX
Pin Description
No connect Pin.
Ground.
Chip Enable (Active High).
Output Voltage Pin.
Switch pin which connected to inductor.
Rev. A.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
n Ordering Information
AME5177 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration
Pin Configuration
A
(DFN-6D)
A
(SOT-25)
A
(SOT-26)
B
(SOT-26)
Rev. A.01
1. NC
2. GND
3. EN
4. OUT
5. NC
6. LX
1. NC
2. GND
3. EN
4. OUT
5. LX
Package Type
E: SOT-2X
V: DFN
Number of Pins
V: 5
Y: 6
Output Voltage
180:
190:
200:
:
:
490:
500:
1.8V
1.9V
2.0V
:
:
4.9V
5.0V
1. NC
2. NC
3. GND
4. OUT
5. LX
6. EN
1. LX
2. GND
3. EN
4. NC
5. VOUT
6. NC
3
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
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
0.8 to 5.5
VOUT
1.8 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. A.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
n Thermal Information
Parameter
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Package
SOT-25
SOT-26
DFN-6D
Die Attach
Symbol
Maximum
θJ C
TBD
Unit
o
Non-Conductive Epoxy
Internal Power Dissipation
Lead Temperature ( soldering 10 sec)**
θJA
TBD
PD
TBD
260
C/W
mW
o
C
* Measure θJC on backside center of molding compound if IC has no tab.
** MIL-STD-202G 210F
Rev. A.01
5
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
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
0.8
0.95
V
0.7
V
2
%
DC/DC Stage
Minimum Input Voltage
At Startup
-2
VOUT=1.8V
1.8
V
VOUT=2.1V
2.1
V
VOUT=2.2V
2.2
V
VOUT=2.7V
2.7
V
VOUT=3.0V
3
V
VOUT=3.3V
3.3
V
VOUT=5.0V
5
V
IQ
VOUT x 1.2
6.5
Rectifying Switch on Resistance
RDS(ON)_P
VOUT=3.3V
1
Ω
Main Switch on Resistance
RDS(ON)_N
VOUT=3.3V
1
Ω
Output Voltage
Quiescent Current
∆VOUT
10
µA
Power MOSFET
Enable Control (SOT-25 Only)
EN Logic-High Voltage
VIH
EN Logic-Low Voltage
VIL
EN Input Current
IEN
Clamp on GND or VOUT
0.1
Shutdown Current
ISD
VEN=0V, VIN=1.2V
IOUT=0mA
0.7
µA
ISW
VOUT=3.3V
450
mA
NMOS Leakage
Ileakage_N
VOUT=3.3V
1
µA
PMOS Leakage
Ileakage_P
VOUT=3.3V
1
µA
0.8
V
0.4
V
1
µA
Protection
Switch Current Limit
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
6
TSD
∆TSD
150
o
C
20
o
C
Rev. A.01
AME
AME5177
n Detailed Description
The AME5177 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 AME5177 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 AME5177 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 AME5177 can be optimized for a wide range of capacitance and ESR values,
such as solid tantalum, ceramic, and aluminum electrolytic capacitors.
Rev. A.01
7
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
Component Reference
Manufacturer
Part Number
Value
C1
Murata
GRM188R60JA106ME47
10µF, 6.3V, X5R
C2
Murata
GRM188R60JA106ME47
10µF, 6.3V, X5R
L1
Murata
LQH43PN100M26
10µH
Table 1. List of Components
VIN
L1
10µH
C1
10µF
VOUT
LX
OUT
EN
GND
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.
8
Rev. A.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
n Characterization Curve
Efficiency vs. Output Current
90.0
6.5
VIN=1.5V , VOUT =2.7V , L=10µH
Quiescent Current (uA)
100.0
Quiescent Current vs. Temperature
Efficiency (%)
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.00010
0.00100
0. 01000
5.5
5
4.5
4
3.5
3
0. 10000
VOUT=2.1V
6
-50
-25
0
25
50
75
100
Output Current (A)
Temperature (oC)
Output Voltage vs. Temperature
CCM Output Voltage Ripple
125
Output Voltage (V)
2.80
2.75
VOUT =2.7V
VOUT
(20mV/Div)
2.70
C2
2.65
2.60
2.55
-50
IL
(50mA/Div)
-25
0
25
50
75
100
C4
125
2.0µs/Div
Temperature ( C)
o
DCM Output Voltage Ripple
VOUT
(20mV/Div)
IL
(50mA/Div)
C2
VOUT
(1V/Div)
C2
VIN
(1V/Div)
C3
IL
(100mA/Div)
C4
C4
2.0µs/Div
Rev. A.01
Power ON from Input Voltage
2.0ms/Div
9
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
n Tape and Reel Dimension
SOT-25
P
W
AME
AME
PIN 1
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOT-25
8.0±0.1 mm
4.0±0.1 mm
3000pcs
180±1 mm
SOT-26
P
W
AME
AME
PIN 1
Carrier Tape, Number of Components Per Reel and Reel Size
10
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOT-26
8.0±0.1 mm
4.0±0.1 mm
3000pcs
180±1 mm
Rev. A.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
n Tape and Reel Dimension (Contd.)
DFN-6D
(2mmx2mmx0.75mm)
P
PIN 1
W
AME
AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
DFN-6D
(2x2x0.75mm)
8.0±0.1 mm
4.0±0.1 mm
3000pcs
180±1 mm
Rev. A.01
11
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
n Package Dimension
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
12
Rev. A.01
AME
Synchronous Boost Converter
With Low Quiescent Current
AME5177
n Package Dimension (Contd.)
SOT-26
Top View
Side View
E
H
D
e
L
PIN 1
S1
A1
A
Front View
b
DFN-6D
(2mmx2mmx0.75mm)
D
e
b
E
L
E1
PIN 1 IDENTIFICATION
D1
SYMBOLS
TOP VIEW
A
G1
REAR VIEW
Rev. A.01
BOTTOM VIEW
G
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
A
0.700
0.800
0.028
0.031
D
1.900
2.100
0.075
0.083
E
1.900
2.100
0.075
0.083
e
0.650 TYP
0.026 TYP
D1
1.100
1.650
0.043
0.065
E1
0.600
1.050
0.024
0.041
b
0.180
0.350
0.007
0.014
L
0.200
0.450
0.008
0.018
G
0.178
0.228
0.007
0.009
G1
0.000
0.050
0.000
0.002
13
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. , June 2013
Document: A015A-DS5177-A.01
Corporate Headquarter
AME, Inc.
8F, 12, WenHu St., Nei-Hu
Taipei 114, Taiwan .
Tel: 886 2 2627-8687
Fax: 886 2 2659-2989