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PDF MAX8969 Data sheet ( Hoja de datos )
| Número de pieza | MAX8969 | |
| Descripción | Step-Up Converter | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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EVALUATION KIT AVAILABLE
MAX8969
Step-Up Converter
for Handheld Applications
General Description
The MAX8969 is a simple 1A step-up converter in a small
package that can be used in any single-cell Li-ion appli-
cation. This IC provides protection features such as input
undervoltage lockout, short circuit, and overtemperature
shutdown.
The IC transitions to skip mode seamlessly under light-
load conditions to improve efficiency. Under these
conditions, switching occurs only as needed, reducing
switching frequency and supply current to maintain high
efficiency.
When the input voltage is sufficient to drive the load, the
IC can be operated in track mode or automatic track
mode (ATM). In track mode, the p-channel MOSFET acts
as a current-limited load switch and quiescent current is
as low as 30µA under a no-load condition. In ATM mode,
the p-channel MOSFET acts as a current-limited load
switch and quiescent current is as low as 60µA under a
no-load condition. In ATM mode, the internal boost cir-
cuitry is enabled, allowing for fast transitions into boost
mode.
The IC is available in a small, 1.25mm x 1.25mm, 9-bump
WLP (0.4mm pitch) package.
Applications
Cell Phones
Smartphones
Mobile Internet Devices
GPS, PND
eBooks
Typical Operating Circuit
INPUT
2.5V TO 5.5V
CIN
4.7µF
L1
1µH
IN LX_ OUT_
MAX8969
EN
OUTPUT
3.7V, 1A
COUT
22µF
TREN
GND_
Features
S Compact Layout
Small, 1.25mm x 1.25mm WLP Package
3MHz PWM Switching Frequency
Small External Components
S Safe and Efficient Step-Up Mode
Up to 1A Output Current
2.5V to 5.5V Input Voltage Range
3.3V to 5V Ouput Voltage Range
Over 90% Efficiency with Internal Synchronous
Rectifier
Low 45µA No-Load Quiescent Current
Soft-Start Controls Inrush Current
True Shutdown™
Low 1µA Shutdown Current
S Track Mode
1A Current Limited
130mI On-Resistance
Low 30µA No Load Quiescent Current
S Automatic Track Mode
130mI On-Resistance
Low 60µA No-Load Quiescent Current
Boost Circuitry Enabled for Fast Transition into
Boost
Ordering Information
PART
VOUT
(V)
TEMP RANGE
PIN-
PACKAGE
MAX8969EWL33+
MAX8969EWL35+
MAX8969EWL37+
MAX8969EWL42+
MAX8969EWL50+
3.3
3.5
3.7
4.25
5.0
-40NC to +85NC
-40NC to +85NC
-40NC to +85NC
-40NC to +85NC
-40NC to +85NC
9 WLP
9 WLP
9 WLP
9 WLP
9 WLP
Note: The output voltage range is from 3.3V to 5V. Contact the
factory for output options and availability.
+Denotes a lead(Pb)-free/RoHS-compliant package.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6038; Rev 1; 5/12
1 page  
MAX8969
Step-Up Converter
for Handheld Applications
Typical Operating Characteristics
(VIN = 3.6V, COUT = 22µF, X5R, 6.3V local and 10µF, X5R, 6.3V, 1µH inductor, circuit of Figure 1, TA = +25NC, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
(VOUT = 5V)
100
VIN = 4.3V
95
90
85 VIN = 3.1V
80 VIN = 2.5V VIN = 3.6V
75
70
65
60
1
L = TOKO DFE252012 1µH
10 100
LOAD CURRENT (mA)
1000
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
3000
VOUT, 5V ≥ 4.5V
2500
2000
1500
1000 VOUT, 3.7V ≥ 3.35V
500
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
EFFICIENCY vs. OUTPUT CURRENT
(VOUT = 3.7V)
100
98 VIN = 3.1V
96
94
92
90
88 VIN = 2.5V
86
84
82
80
1
L = TOKO DFE252012 1µH
10 100
LOAD CURRENT (mA)
1000
5.05
5.00
4.95
4.90
4.85
4.80
4.75
4.70
4.65
4.60
4.55
0
OUTPUT VOLTAGE (VOUT = 5V)
vs. OUTPUT CURRENT
VIN = 3.6V VIN = 4.3V
VIN = 3.2V
VIN = 2.5V
200 400 600 800
OUTPUT CURRENT (mA)
1000
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
80
70 VOUT = 5V
60
50
40
30 VOUT = 3.7V
20
10
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (VOUT = 3.7V)
vs. OUTPUT CURRENT
4.4
4.2
4.0
VIN = 2.5V
3.8 VIN = 3.2V
VIN = 4.3V
3.6
3.4 VIN = 3.6V
3.2
0
200 400 600 800
OUTPUT CURRENT (mA)
1000
OUTPUT VOLTAGE (VOUT = 5V)
vs. INPUT VOLTAGE
5.5
IOUT = 10mA IOUT = 100mA IOUT = 600mA
5.0
4.5
IOUT = 1000mA
AUTOMATIC
FREQUENCY
AUTOMATIC
4.0 ADJUSTMENT TRACK MODE
TRANSITION
3.5
3.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (VOUT = 3.7V)
vs. INPUT VOLTAGE
5.0
4.5
IOUT = 10mA
AUTOMATIC
TRACK MODE
TRANSITION
4.0 IOUT = 100mA
3.5 IOUT = 1000mA
IOUT = 600mA AUTOMATIC
3.0 FREQUENCY
ADJUSTMENT
2.5
2.5
3.0 3.5 4.0
INPUT VOLTAGE (V)
4.5
Maxim Integrated
5
5 Page 
MAX8969
Step-Up Converter
for Handheld Applications
TRUE SHUTDOWN:
P1 BODY DIODE
LX_
IN
N1 = OFF
P1 = OFF
OUT_
TRACK/ATM MODE:
P1 BODY DIODE
IN
N1 = OFF
BOOST SOFT-START:
LX_
P1 = CURRENT-
LIMITED SWITCH
P1 BODY DIODE
LX_
IN
N1 = SWITCHING
P1 = OFF
OUT_
OUT_
BOOST MODE:
IN
N1 = SWITCHING
P1 BODY DIODE
LX_
P1 = SWITCHING
OUT_
BOOST EXIT MODE:
IN
N1 = OFF
P1 BODY DIODE
LX_
P1 = OFF
OUT_
Figure 3. Modes of Operation
Maxim Integrated
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX8969.PDF ] | |
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