PCN20070604

Product Change Notices
PCN No.:20070604
Date:06/21/2007
This is to inform you that AME5134 datasheet has been changed from Rev. A.01 to
Rev. B.01. This notification is for your information and concurrence.
If you require data or samples to qualify this change, please contact AME, Inc.
within 30 days of receipt of this notification.
If we do not receive any response from you within 30 calendar days from the
date of this notification, we will consider that you have accepted this PCN.
If you have any questions concerning this change, please contact:
PCN Originator:
Name: Amy Shen
Email: [email protected]
Description of Change (From):
Description of Change (To):
Reason for Change: Follow industrial standard.
QPM018B-B
AME, Inc.
AME5134
n General Description
High-Efficiency, 30V Boost
Converters for 2 to 6 White LEDs
n Applications
The AME5134 drives white LEDs in series with a constant current to provide efficient display backlighting in
cellular phones, PDAs, and other hand-held devices. The
step-up converter includes an internal 30V, low RDSON, Nchannel MOSFET switch for high efficiency and maximum battery life.
l Cellular Phones
l PDA, Palmtop, and Wireless Handhelds
l Color Display Backlight
To control LED brightness, the LED current can be
pulsed by applying a single analog/PWM signal with a
frequency range of 100Hz to 10 KHz to the control
pin(CTRL). A separate enable input provides on/off control. Soft-start minimizes inrush current during start up.
The AME5134 is available in space-saving DFN-8 (3mmx
3mmx0.85mm) package.
n Features
n Typical Application
l Constant-Current Regulation for LED
IIIumination
l Internal 30V MOSFET Switch Capable of
Driving 6LEDs
L1
47µH
VIN
2.7V to 5.5V
C1
4.7µF
C2
0.47µF
l Small, Low-Profile External Components
l 2.7V to 5.5V Input Range
ON
OFF
l Up to 88% Efficiency Driving 6 LEDs
l Precise Brightness Control Using PWM
l Soft-Start to Minimize Inrush Current
l DFN-8 (3mmx3mmx0.85mm) Package
SW
EN
OV
AME5134
Signal or Analog Signal
l Optimized for Low Input Ripple
VIN
PWM
OR
DC Control
CTRL
SS
R1
200KΩ
C4
4700pF
R2
10KΩ
FB
GND
R3
10Ω
l All AME's Lead Free Products Meet RoHS
Standard
Rev.B.01
C3
0.1µF
1
AME, Inc.
High-Efficiency,30V Boost
Converters for 2 to 6 White LEDs
AME5134
n Function Block Diagram
VIN
EN
EN
VIN
SW
VIN
VREF
VREF
DRIVER
CTRL
CTRL
FB
Dimming
Controller
Boost
Controller
UVP
SS
SS
UVP
OV
OV
GND
Current limit
FB
UVP
2
OVER
VOLTAGE
COMPARATOR
+
-
OV
AME5134
Rev.B.01
AME, Inc.
High-Efficiency, 30V Boost
Converters for 2 to 6 White LEDs
AME5134
n Pin Configuration
Top View
DFN-8
(3mmx3mmx0.85mm)
8
7
6
5
AME5134AEVA
1. GND
2. IN
3. EN
4. CTRL
AME5134
5. FB
6. SS
1
2
3
4
7. OV
8. SW
* Die Attach:
Conductive Epoxy
Note : The area enclosed by dashed line represents Exposed Pad and connect to GND.
n Pin Description
Pin #
Pin Name
Pin Description
1
GND
2
IN
Input-Supply Pin.
3
EN
Enable Input.
Ground
Brightness-Control pin. Either an analog or PWM control signal can
be used. The PWM signal must be between 100Hz and 10kHz, and
must have an amplitude greater than 1.8V.
4
CTRL
5
FB
Feedback Input. Connect to the cathode of the LED string and
connect a resistor from FB to GND to set the LED current.
6
SS
Soft-Start Timing-Control Input. A 0.1uF provides a soft start time of
20ms.
7
OV
Over voltage Sense. Connect to a resistor-divider
from the anode of the LED string to set the over voltage threshold.
8
SW
Power Switch input. This is the drain of the internal NMOS power
switch. Minimize the metal trace area connected to this pin to
minimize EMI.
Rev.B.01
3
AME, Inc.
High-Efficiency,30V Boost
Converters for 2 to 6 White LEDs
AME5134
n Ordering Information
AME5134 x x x x xxx x - x
Special Feature2
Special Feature1
Output Voltage
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
Pin
Operating Ambient Package
Configuration Temperature Range
Type
A
(DFN-8)
1. GND
2. IN
3. EN
4. CTRL
5. FB
6. SS
7. OV
8. SW
E: -40OC to 85OC
V: DFN
Number
of
Pins
Output Voltage
Special
Feature1
A: 8
ADJ: Adjustable
Z: Lead free
Special Feature2
(For DFN package only)
3: 3x3x0.85(mm) (LxWxH)
n Ordering Information
Part Number
Marking*
Output
Voltage
Package
Operating Ambient
Temperature Range
AME5134AEVAADJZ-3
BDQ
yyww
ADJ
DFN-8
(3mmx3mmx0.85mm)
-40OC to 85OC
Note: yyww represents the date code
* A line on top of the first character represents lead free plating such as BDQ.
Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability.
4
Rev.B.01
AME, Inc.
High-Efficiency, 30V Boost
Converters for 2 to 6 White LEDs
AME5134
n Absolute Maximum Ratings
Parameter
Maximum
VIN , FB, OV to GND
-0.3 to 6.0
SW to GND
-0.3 to 30
EN, CTRL, SS to GND
Unit
V
-0.3 to (V IN + 0.3)
B*
ESD Classification
Caution: Stree above the listed absolute maximum rating may cause permanent damage to the device.
* HBM B:2000V~3999V
n Recommended Operating Conditions
Parameter
Symbol
Rating
Ambient Temperature Range
TA
-40 to 85
Junction Temperature Range
TJ
-40 to 125
Storage Temperature Range
TSTG
-65 to 150
Unit
o
C
n Thermal Information
Parameter
Package
Die Attach
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
DFN-8
(3mmx3mmx0.85mm)
Conductive
Epoxy
Internal Power Dissipation
Solder Iron(10 Sec)**
Symbol
Maximum
θJC
17
o
C/W
θJA
125
o
C/W
PD
800
350
Unit
mW
o
C
* Measure θJC on center of molding compound if IC has no tab. O
** MIL-STD-202G 210F F
Rev.B.01
5
AME, Inc.
High-Efficiency,30V Boost
Converters for 2 to 6 White LEDs
AME5134
n Electrical Specifications
VIN = 3.3V, VOV = 0V, COUT = 1µF, RSENSE = 10Ω, TA = -40oC to 85oC, unless otherwise noted.
Typical values are TA = +25 oC
Parameter
Supply Voltage
UVP Voltage
UVP
VIN rising or falling,
35mV hysteresis typical
Not switching, VFB = 0.5V
0.33
0.65
Switching, VFB = 0V
0.44
0.9
TA = +25oC
0.1
1
TA = +85oC
1
VEN = 0V
OV Threshold
VOV
Rising edge
OV Input Bias Current
IOV
VOV = 1V
CTRL Input Resistance
RCTRL
t ON
Minimum Off-Time
t OFF
FB Threshold
VFB
FB Input Bias Current
IFB
1.18
TA = +25oC
o
TA = +85 C
0 < VCTRL < 1.5V, EN = VIN
VIN = 3.3V
VCTRL = 1.25V
192
VCTRL = 3.3V
VFB = 1.0V
SW Leakage Current
ISW
EN Logic-Level High
VEH
EN Logic-Level Low
VEL
EN Input Current
IEN
1.33
1
200
400
600
V
nA
kΩ
ns
203
TA = +85oC
100
0.8
217
200
1.4
220
VSW = 30V
TA = +25 C
0.1
VEN = 0V
TA = +85oC
1
5
0.4
TA = +25oC
0.01
TA = +85oC
0.1
mV
nA
Ω
mA
1.8
VEN = 0V to VIN
µA
250
15
o
mA
µs
TA = +25oC
start up condition
V
3.4
280
RDSON
ICL
1.25
10
200
Units
5.5
2.65
ISD
2.35
Max
2.5
Shutdown Current
Maximum On- Time
Typ
2.7
IQ
SW Current Limit
Min
VIN
Quiescent Current
SW On-Resistance
6
Test Condition
Symbol
1
µA
V
µA
Rev.B.01
AME, Inc.
High-Efficiency, 30V Boost
Converters for 2 to 6 White LEDs
AME5134
n Detailed Description
The AME5134 features a minimum off-time, currentlimited control scheme. Operation can be best understood by referring to Figure 2.When the voltage at the FB
pin is less than regulation threshold, NMOS switch is
turned on and the inductor current ramps up to the current limit. Once the current in the inductor reaches peak
current limit the NMOS switch will be turned off for 250nS,
at mean time the SW voltage will rise to a voltage that
equals output voltage plus a diode drop and the inductor
current will begin to decrease as shown in Figure 2.During this time the energy stored in the inductor is transferred to COUT and the load. After 250ns, if the voltage at
FB is above the regulation threshold, the NMOS switch
stays off. If the voltage at FB is below the regulation threshold, the NMOS switch turns back on and the cycle repeats.
Shutdown
The AME5134 features a low-current shutdown feature. When EN is low, the IC turns off, reducing its supply
current to approximately 0.1µA. For normal operation, drive
EN high or connect to VIN.
Soft-Start
Soft-start provided on the AME5134 to minimize inrush current. The soft-start time is set with an external
capacitor, C3. Use the following equation to solve for C3:
C3 =
tss
2 x 10 5
Where tss is the soft-start time.
Overvoltage Protection
A. Use a DC Signal to CTRL pin
At CTRL, applying a DC signal in the range of 0V to
1.8V control the LED current. CTRL can be overdriven;
however, applying a CTRL greater than 1.8V does not increase the LED current above the level at 1.8V.( See the
LED Current vs. CTRL Voltage graph.)
B. Use a PWM Signal to CTRL pin
The CTRL input is used as a digital input allowing LED
brightness control with a logic-level PWM signal applied
directly to CTRL. The frequency range is from 100Hz to
10kHz, while 0% duty cycle corresponds to minimum
current, and 100% duty cycle corresponds to full current.
(See the LED Current vs. CTRL Duty Cycle graph.) The
CTRL resistor and SS capacitor from a low pass filter, so
PWM dimming results in DC current to the LEDs without
the need for additional RC filters.
Capacitor Selection
A 0.47µF ceramic output capacitor (C2) is recommended for most applications. For circuits driving six or
fewer LEDs, use a 4.7µF ceramic input capacitor (C1).
For best stability over a wide temperature range, use
capacitors with an X5R, X7R, or better dielectric.
Inductor Selection
The AME5134 has a 220mA inductor current limit and
can drive up to six LEDs at 20mA.The selected inductor
must have a saturation current that meets the maximum
peak current of the converter. For best efficiency, the
inductor's DC resistance should also be as low as possible.
Diode Selection
OVP is designed to prevent the output voltage from
exceeding the maximum internal NMOS switch voltage
rating of 30V. The peak output voltage in an overvoltageprotection event is set with a resistor-divider from the
output connected to 0V (R1 and R2). Select a value for
R2(10kΩ is recommended), then solve for R1 using the
following equation:
R1 = R2 x (
Dimming Control
VOUT
VOV
The AME5134 high switching frequency demands a
high-speed rectification diode (D1) for optimum efficiency.
A Schottky diode is recommended due to its fast recovery time and low forward-voltage drop.
1)
Where VOV is the overvoltage threshold, and VOUT is the
desired peak output voltage.
Rev.B.01
7
AME, Inc.
AME5134
High-Efficiency,30V Boost
Converters for 2 to 6 White LEDs
Layout Considerations
When laying out a board, minimize trace lengths between the IC and the inductor, diode, input capacitor,
output capacitor, and R1. Keep traces short, direct, and
wide. Keep noisy traces, such as the SW node trace,
away from FB. Place the VIN bypass capacitor(C1) as
close to the IC as possible. The ground connections of
C1 and C2 should be as close together as possible. Star
connect the grounds for R2, R3, C3, and the CTRL voltage supply as close to the IC as possible.
8
Rev.B.01
AME, Inc.
High-Efficiency, 30V Boost
Converters for 2 to 6 White LEDs
AME5134
Efficiency vs Load Current
Driving 6 White LEDs
Efficiency vs Load Current
Driving 6 White LEDs
100
100
VIN=5V
VIN=4V
80
VIN=3.3V
70
Inductor=33µH
CLEDS = 4700pF
60
VIN=5V
VIN=4V
90
VIN=3.6V
Efficiency (%)
Efficiency (%)
90
VIN=3.3V
VIN=3.6V
80
70
Inductor=47µH
CLEDS=4700pF
60
50
50
0
5
10
15
20
0
5
Load Current (mA)
10
15
20
Load Current (mA)
Efficiency vs Load Current
Driving 6 White LEDs
100
26
LED Current vs Input Voltage
Driving 6 White LEDs
L=47µH
90
Efficiency (%)
VIN=5V
80
LED Current (mA)
VIN=3.6V
VIN=3V
VIN=4V
70
Inductor=22µH
No Capactor across LEDs
60
5
10
15
20
L=22µH
L=33µH
17
14
11
2.5
50
0
23
20
3
3.5
4
4.5
5
Load Current (mA)
Input Voltage (V)
LED Current vs. Input Voltage
LED Current vs CTRL Voltage
5.5
35
25
30
19
L=33µH
L=22µH
LED Current (mA)
LED Current (mA)
22
L=47µH
16
13
10
7
3
3.5
4
4.5
Input Voltage (V)
Rev.B.01
20
15
10
5
4
1
2.5
25
5
5.5
0
0
0.6
1.2
1.8
2.4
3
3.6
CTRL Voltage (V)
9
AME, Inc.
High-Efficiency,30V Boost
Converters for 2 to 6 White LEDs
AME5134
Switching Waveforms
VSW
Switching Waveforms
10V/div
VOUT
200mA/div
IL
200mV/div
VSW
10V/div
VOUT
200VOUT
IL
200VOUT
2µs/div
2µs/div
Discontinuous Operation,
3.75V Li+Battery, 10mA Output
L=47µH, C LEDS=4700 pF
Continuous Operation,
3.75V Li+Battery, 18mA Output
L=47µH, C LEDS=4700 pF
CTRL Step Respone
Starup/Shutdown Waveforms
VEN
VCTRL
5V/div
1V/div
VFB
200mV/div
VOUT
VFB
200mV/div
20V/div
VOUT
10V/div
20ms/div
40ms/div
L=22µH
VCTRL=0.5V to 1.25V to 0.5V
L=22µH
LED Current vs CTRL Duty Cycle
OVP Waveforms
30
LED Current (mA)
25
20
OVP
15
10
10V/div
5
0
0
20
40
60
80
100
20ms/div
CTRL Duty Cycle (%)
10
Rev.B.01
AME, Inc.
High-Efficiency, 30V Boost
Converters for 2 to 6 White LEDs
AME5134
Soft Start Response
VEN
5V/div
VFB
200mV/div
C3=0.1µF
10ms/div
Rev.B.01
11
AME, Inc.
High-Efficiency,30V Boost
Converters for 2 to 6 White LEDs
AME5134
n Tape and Reel Dimension
DFN-8
(3mmx3mmx0.85mm)
P
PIN 1
W
AME
AME
Carrier Tape, Number of Components Per Reel and Reel Size
12
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
DFN-8
(3mmx3mmx0.85mm)
8.0±0.1 mm
4.0±0.1 mm
1000pcs
180±1 mm
Rev.B.01
AME, Inc.
High-Efficiency,30V Boost
Converters for 2 to 6 White LEDs
AME5134
n Tape and Reel Dimension
DFN-8
(3mmx3mmx0.85mm)
P
PIN 1
W
AME
AME
Carrier Tape, Number of Components Per Reel and Reel Size
12
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
DFN-8
(3x3x0.85mm)
8.0±0.1 mm
4.0±0.1 mm
3000pcs
330±1 mm
Rev.B.01
AME, Inc.
High-Efficiency, 30V Boost
Converters for 2 to 6 White LEDs
AME5134
n Package Dimension
DFN-8 (3mmx3mmx0.85mm)
D
SYMBOLS
MILLIMETERS
MIN
TOP VIEW
H
D2
MIN
0.900
A
E
MAX
INCHES
MAX
0.035
D
2.900
3.100
0.114
0.122
E
2.900
3.100
0.114
0.122
F
0.550 TYP.
0.220 TYP.
e
0.650 TYP.
0.026 TYP.
D2
1.500 TYP.
0.059 TYP.
E2
2.400 TYP.
0.094 TYP.
b
0.200
0.300
0.0079
0.012
L
0.450
0.550
0.018
0.022
G
0.010
0.090
0.0004
0.004
H
0.000
0.050
0.000
0.002
L
b
PIN 1 ID
E2
e
BOTTOM VIEW
A
G
F
SIDE VIEW
Rev.B.01
13
www.ame.com.tw
E-Mail: [email protected]
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 2007
Document: 1029-DS5134-B.01
Corporate Headquarter
U.S.A.(Subsidiary)
AME, Inc.
Analog Microelectronics, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District
3100 De La Cruz Blvd., Suite 201
Taipei 114, Taiwan, R.O.C.
Tel: 886 2 2627-8687
Santa Clara, CA. 95054-2438
Tel : (408) 988-2388
Fax: 886 2 2659-2989
Fax: (408) 988-2489