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PDF MAX1605ETT-T Data sheet ( Hoja de datos )
| Número de pieza | MAX1605ETT-T | |
| Descripción | 30V Internal Switch LCD Bias Supply | |
| Fabricantes | Maxim Integrated | |
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19-1666; Rev 1; 10/03
30V Internal Switch LCD Bias Supply
General Description
The MAX1605 boost converter contains a 0.5A internal
switch in a tiny 6-pin SOT23 package. The IC operates
from a +2.4V to +5.5V supply voltage, but can boost
battery voltages as low as 0.8V up to 30V at the output.
The MAX1605 uses a unique control scheme providing
the highest efficiency over a wide range of load condi-
tions. An internal 0.5A MOSFET reduces external com-
ponent count, and a high switching frequency (up to
500kHz) allows for tiny surface-mount components. The
current limit can be set to 500mA, 250mA, or 125mA,
allowing the user to reduce the output ripple and com-
ponent size in low-current applications.
Additional features include a low quiescent supply cur-
rent and a shutdown mode to save power. The
MAX1605 is ideal for small LCD panels with low current
requirements, but can also be used in other applica-
tions. A MAX1605EVKIT evaluation kit (EV kit) is avail-
able to help speed up design time.
Features
o Adjustable Output Voltage up to 30V
o 20mA at 20V from a Single Li+ Battery
o 88% Efficiency
o Up to 500kHz Switching Frequency
o Selectable Inductor Current Limit
(125mA, 250mA, or 500mA)
o 18µA Operating Supply Current
o 0.1µA Shutdown Current
o Avaiable in Two Small Packages
6-Pin TDFN
6-Pin SOT23
Applications
LCD Bias Generators
Cellular/Cordless Phones
Palmtop Computers
Personal Digital Assistants (PDAs)
Organizers
Handy Terminals
Ordering Information
PART
TEMP
RANGE
MAX1605EUT-T -40°C to +85°C
MAX1605ETT-T -40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 TDFN
SOT
MARK
AAHP
ABW
Typical Operating Circuit
VIN = 0.8V TO VOUT
L1
10µH
TOP VIEW
Pin Configuration
VCC = 2.4V TO 5.5V VCC
LX
ON
OFF
MAX1605
LIM FB
SHDN
GND
VOUT = VIN TO 30V
SHDN 1
6 FB SHDN 1
6 FB
VCC 2 MAX1605 5 LIM VCC 2
GND 3
4 LX GND 3
MAX1605
5 LIM
4 LX
SOT23
TDFN
3mm ✕ 3mm
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
30V Internal Switch LCD Bias Supply
Typical Operating Characteristics (continued)
(VCC = 3.3V, VIN = 3.6V, L1 = 10µH, SHDN = LIM = VCC, VOUT(NOM) = 18V (Figure 3), TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(L1 = 47µH)
90
88
86
LIM = OPEN
84 (250mA)
82 LIM = GND
(125mA)
80
78 LIM = VCC
76 (500mA)
74
0
5 10 15 20
LOAD CURRENT (mA)
25
CURRENT LIMIT vs. INPUT VOLTAGE
600
500 LIM = VCC
400
LIM = OPEN
300
200 LIM = GND
100
0
369
INPUT VOLTAGE (V)
12
EFFICIENCY vs. LOAD CURRENT
(L1 = 100µH)
90
88
86
LIM = GND
LIM = OPEN
(250mA)
84 (125mA)
82
80
78 LIM = VCC
76 (500mA)
74
0
5 10 15 20
LOAD CURRENT (mA)
25
SUPPLY CURRENT
vs. SUPPLY VOLTAGE (NO-LOAD)
25
20
15
10
5
0
01 2 3 4 5
SUPPLY VOLTAGE (V)
CURRENT LIMIT vs. SUPPLY VOLTAGE
600
LIM = VCC
500
400
300 LIM = OPEN
200
LIM = GND
100
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. LOAD CURRENT
3.0
LIM = GND
2.5 (125mA)
LIM = OPEN
2.0 (250mA)
1.5
1.0 LIM = VCC
(500mA)
0.5
0
0 5 10 15 20 25
LOAD CURRENT (mA)
LINE TRANSIENT
MAX1605 toc13
6V
4V
2V
18.1V
18
17.9V
200µs/div
A: VIN = VCC = 2.4V TO 5.5V
B: VOUT = 18V, ROUT = 3.6kΩ
10mA
0
18.1V
18V
17.9V
500mA
0
LOAD TRANSIENT
MAX1605 toc14
40µs/div
VOUT = 18V, IOUT = 1mA TO 10mA
VCC = 3.3V, VIN = 3.6V
SHUTDOWN WAVEFORM
MAX1605 toc15
4V
2V
0
500mA
250mA
0
20V
10V
0
200µs/div
VOUT = 18V, ROUT = 1.8kΩ
VCC = 3.3V, VIN = 3.6V
_______________________________________________________________________________________ 5
5 Page 
30V Internal Switch LCD Bias Supply
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
1
PIN 1
INDEX
AREA
D
A
A2
L
D2
PIN 1 ID
N1
C0.35
b
E E2
[(N/2)-1] x e
REF.
DETAIL A
e
A1 k
CL
L
e
A
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
CL
L
e
DALLAS
SEMICONDUCTOR
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 6, 8 & 10L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
APPROVAL
DOCUMENT CONTROL NO.
21-0137
REV.
D
1
2
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1605ETT-T.PDF ] | |
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