MAX8569AETT+ [MAXIM]
200mA Step-Up Converters in 6-Pin SOT23 and TDFN;
| 型号： | MAX8569AETT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 200mA Step-Up Converters in 6-Pin SOT23 and TDFN 信息通信管理 开关 光电二极管 |
| 文件： | 总11页 (文件大小：304K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3671; Rev 0; 5/05
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
General Description
Features
ꢀ Over 200mA Available Output Current
The MAX8569A/MAX8569B low-quiescent-current
boost regulators provide up to 200mA at output volt-
ages up to 5.5V from a 1.5V to 5.5V input source. The
built-in synchronous rectifier allows for over 90% effi-
ciency while achieving small size and low cost by elimi-
nating the need for an external Schottky diode.
ꢀ 1.5V to 5.5V Input Voltage Range
ꢀ BATT Connected to OUT in Shutdown for Backup
Power
ꢀ Up to 95% Efficiency
The MAX8569A provides an adjustable output while the
MAX8569B is fixed at 3.0V or 3.3V. The MAX8569B fea-
tures a power-on reset output (RST) to signal that the
output has reached regulation. All devices connect the
battery input to the output during shutdown, allowing
the input battery to be used as a backup or real-time
clock supply when the converter is off.
ꢀ 7µA Typical Quiescent Current
ꢀ <1µA Shutdown Supply Current
ꢀ Internal Synchronous Rectifier
ꢀ 750mA Switch Current Limit
ꢀ RST Output (MAX8569B)
ꢀ Adjustable Output Voltage (MAX8569A)
ꢀ Fixed 3.0V or 3.3V Output Voltage (MAX8569B)
Applications
Medical Diagnostic
Equipment
Cordless Phones
Battery Backup
PC Cards
Ordering Information
Digital Cameras
PART
TEMP RANGE PIN-PACKAGE
PDAs and Smartphones
6 SOT23-6
-40°C to +85°C
Local 3.3V or 5V Supply
MAX8569AEUT-T*
(U6FH-6)
Typical Operating Circuit
6 TDFN 3mm x 3mm
-40°C to +85°C
MAX8569AETT+
MAX8569BEUT-T*
MAX8569BETT+
(T633-1)
3.3V, 200mA
OUTPUT
OUT
BATT
6 SOT23-6
-40°C to +85°C
(U6FH-6)
MAX8569B
2V
INPUT
LX
6 TDFN 3mm x 3mm
-40°C to +85°C
POWER-ON
RESET
RST
(T633-1)
ON
OFF
SHDN
6 TDFN 3mm x 3mm
(T633-1)
GND
MAX8569BETT30+ -40°C to +85°C
*Future product—contact factory for availability.
+Denotes lead-free packaging.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
TOP VIEW
6
5
4
1
2
3
6
SHDN
BATT
GND
FB (RST)
OUT
MAX8569A
(MAX8569B)
5
4
MAX8569A
(MAX8569B)
LX
SOT23
+
1
2
3
( ) ARE FOR THE MAX8569B
TDFN
+ DENOTES LEAD-FREE PACKAGING
________________________________________________________________ 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.
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
ABSOLUTE MAXIMUM RATINGS
BATT, LX, OUT, FB, RST to GND .............................-0.3V to +6V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
SHDN to GND...........................................-0.3V to (V + 0.3V)
LX Current....................................................................1.5A Peak
OUT
Continuous Power Dissipation (T = +70°C)
A
6-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW
6-Pin TDFN 3mm x 3mm
(derate 18.2mW/°C above +70°C).............................1454mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
= V
= 3.3V, V
= 2.0V, T = -40°C to +85°C. Typical values are at T = +25°C, unless otherwise noted.) (Note 1)
SHDN
OUT
BATT
A
A
PARAMETER
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
Battery Input Range
1.5
V
T
T
= +25°C
1.22
1.24
1.5
A
Startup Voltage
R
= 2.6kΩ
V
LOAD
= -40°C to +85°C
A
MAX8569A
2.0
5.5
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
= +25°C
2.94
3.0
3.06
MAX8569BETT30
Output Voltage
= -40°C to +85°C
= +25°C
2.925
3.233
3.217
1.208
1.203
3.075
3.366
3.373
1.248
1.253
20
V
3.300
1.228
MAX8569B
MAX8569A
= -40°C to +85°C
= +25°C
Feedback Threshold
V
= -40°C to +85°C
= +25°C
3.5
4
Feedback Bias Current
MAX8569A, V = 1.27V
nA
FB
= -40°C to +85°C
n-Channel On-Resistance
p-Channel On-Resistance
I
I
= 100mA
0.3
0.3
750
0.7
0.9
920
975
6.5
50
60
10
1
Ω
Ω
LX
LX
= 100mA
T
T
= +25°C
650
600
3.5
3
A
n-Channel Switch Current Limit
mA
µs
= -40°C to +85°C
A
Switch Maximum On-Time
V
= 2.8V
5
OUT
T
T
= +25°C
25
A
A
Synchronous Rectifier Zero-
Crossing Current
mA
= -40°C to +85°C
0
OUT Quiescent Current
OUT Shutdown Current
BATT Quiescent Current
BATT Shutdown Current
SHDN Logic-Low
V
V
V
V
= 3.5V, V = 1.3V (Note 2)
4
µA
µA
µA
µA
V
OUT
OUT
OUT
OUT
FB
= 3.5V, V
= V = 0V
0.05
3
SHDN
FB
= 3.5V, V = 1.3V (Note 3)
10
1
FB
= 3.5V, V
= 0V
0.01
SHDN
0.3
2
_______________________________________________________________________________________
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V
= V
= 3.3V, V
= 2.0V, T = -40°C to +85°C. Typical values are at T = +25°C, unless otherwise noted.) (Note 1)
SHDN
OUT
BATT
A
A
PARAMETER
SHDN Threshold
CONDITIONS
MIN
TYP
MAX
UNITS
Rising edge,
T
T
= +25°C
1.185
1.228
1.271
A
V
100mV hysteresis (typ),
= -40°C to +85°C
1.170
1.286
100
A
V
= 2.8V
OUT
OUT
T
T
= +25°C
13
13
A
SHDN Input Bias Current
RST Low Voltage
V
= 5.5V
nA
V
= -40°C to +85°C
A
I
= 1mA, V
= 5.5V
= 2.5V
OUT
0.2
RST
T
T
= +25°C
0.1
1
100
A
RST Leakage Current
V
nA
RST
= -40°C to +85°C
A
Relative to OUT,
3.3V for MAX8569B,
3.0V for MAX8569BETT30
T
T
= +25°C
85
85
90
90
95
A
RST Threshold
%
= -40°C to +85°C
97
A
T
T
= +25°C
1
150
A
LX Leakage Current
V
= 5.5V
nA
OUT
= -40°C to +85°C
150
200
88
A
Maximum Load Current
Efficiency
V
V
= 2V, V
= 2V, V
= 3.3V
mA
%
BATT
BATT
OUT
= 3.3V, Figures 1 or 2, I
= 40mA
OUT
LOAD
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
Note 2: Supply current into OUT. This current is drawn from the source battery, but is reduced in value according to the step-up
ratio and efficiency.
Note 3: Does not include switching losses and output quiescent current. See the Input Current and Output Voltage vs. Input Voltage
(On, 330Ω) graph in the Typical Operating Characteristics for operating quiescent current.
_______________________________________________________________________________________
3
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
Typical Operating Characteristics
(Circuit of Figure 2, V
= 3.3V, V
= +2V, T = +25°C, circuit of Figure 1, T = +25°C, unless otherwise noted.)
BATT A A
OUT
EFFICIENCY vs. LOAD CURRENT
= 5V
EFFICIENCY vs. LOAD CURRENT
= 3.3V
V
OUT
V
OUT
100
95
95
V
= 2.5V
V
IN
V
= 4.2V
IN
90
85
V
= 3.3V
IN
= 2V
IN
90
85
80
75
V
= 2.5V
IN
V
= 1.5V
IN
80
75
70
65
70
65
1
10
100
1000
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAXIMUM OUTPUT CURRENT
vs. BATTERY VOLTAGE
EFFICIENCY vs. LOAD CURRENT
V
OUT
= 2.5V
600
500
400
300
100
95
V
= 2.5V
OUT
V
= 3.3V
OUT
90
85
80
75
70
65
60
V
= 2V
IN
V
= 5V
OUT
4.5
V
= 1.5V
IN
200
100
0
1.5
2.5
3.5
5.5
1
10
100
1000
BATTERY VOLTAGE (V)
LOAD CURRENT (mA)
OUTPUT VOLTAGE AND INPUT CURRENT
vs. INPUT VOLTAGE (SHUTDOWN, NO LOAD)
STARTUP VOLTAGE vs. LOAD RESISTANCE
MAX8569 toc06
6
6
5
4
3
2
1
0
1.34
1.32
5
4
3
2
1
0
V
OUT
1.30
1.28
1.26
1.24
I
BATT
1.22
1.20
0
1
2
3
4
5
6
10
100
1k
10k
BATTERY VOLTAGE (V)
R
( )
LOAD
4
_______________________________________________________________________________________
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
Typical Operating Characteristics (continued)
(Circuit of Figure 2, V
= 3.3V, V
= +2V, T = +25°C, circuit of Figure 1, T = +25°C, unless otherwise noted.)
OUT
BATT
A
A
OUTPUT VOLTAGE AND INPUT CURRENT
vs. INPUT VOLTAGE (ON, 330
OUTPUT VOLTAGE AND INPUT CURRENT
)
vs. INPUT VOLTAGE (SHUTDOWN, 200mA LOAD)
MAX8569 toc07
MAX8569 toc08
6
5
4
3
2
1
0
6
5
4
3
2
1
0
4.5
4.0
4.5
4.0
V
OUT
V
OUT
3.5
3.0
2.5
3.5
3.0
2.5
2.0
1.5
1.0
2.0
1.5
1.0
I
BATT
I
BATT
4
0.5
0
0.5
0
0
1
2
3
5
6
0
1
2
3
4
5
6
BATTERY VOLTAGE (V)
BATTERY VOLTAGE (V)
OUTPUT VOLTAGE AND INPUT CURRENT
vs. INPUT VOLTAGE (ON, 16 LOAD)
ON/OFF RESPONSE (R
= 33 )
LOAD
MAX8569 toc10
MAX8569 toc09
4.5
4.0
4.5
4.0
V
OUT
3.5
3.0
2.5
3.5
3.0
2.5
V
OUT
1V/div
1V/div
2.0
1.5
1.0
2.0
1.5
1.0
I
BATT
V
IN
0.5
0
0.5
0
0
1
2
3
4
5
6
100 s/div
BATTERY VOLTAGE (V)
LOAD TRANSIENT
LINE TRANSIENT
MAX8569 toc11
MAX8569 toc12
V
OUT
100mV/div
100mV/div
(AC-COUPLED)
V
OUT
(AC-COUPLED)
2.5V
2V
200mA
20mA
I
OUT
V
IN
100 s/div
100ms/div
_______________________________________________________________________________________
5
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
Typical Operating Characteristics (continued)
(Circuit of Figure 2, V
= 3.3V, V
= +2V, T = +25°C, circuit of Figure 1, T = +25°C, unless otherwise noted.)
OUT
BATT
A
A
SHUTDOWN RESPONSE
(R = 33
SWITCHING WAVEFORMS
(R = 33
)
)
LOAD
LOAD
MAX8569 toc13
MAX8569 toc14
V
OUT
(AC-COUPLED)
100mV/div
2V/div
3.3V
2V
V
OUT
V
LX
I
L
V
SHDN
500mA/div
2V/div
100 s/div
10 s/div
Pin Description
PIN
MAX8569A MAX8569B
NAME
FUNCTION
Shutdown Input. Drive SHDN low to place the MAX8569 in shutdown mode. SHDN can be
used for a low-battery cutoff (1.228V threshold). See the Low-Battery Cutoff section for
details. Drive SHDN high for normal operation.
1
1
SHDN
Battery Voltage Connection. Connect BATT to a 1.5V to 5.5V supply. Bypass BATT to GND
with a 10µF or larger ceramic capacitor.
2
3
4
2
3
4
BATT
GND
LX
Ground
Inductor Connection. Connect the switched side of the inductor to LX. During shutdown,
LX is connected to OUT.
Output Voltage. Bypass OUT to GND with a 10µF or larger ceramic capacitor. During
shutdown, OUT is connected to LX. OUT is also the bootstrapped supply input for the IC.
5
6
5
OUT
FB
Feedback Input. Connect FB to the center tap of an external resistor-divider from OUT to
GND to set the output voltage. V regulates to 1.228V.
FB
—
Reset Output. RST is an open-drain output that goes high impedance when the output
voltage rises above 90% of the nominal regulation voltage. RST pulls low when the output
is below 90% of the nominal regulation voltage. RST is high impedance during shutdown.
—
—
6
RST
Exposed Paddle (TDFN Package Only). Connect to the PC board ground plane for
increased thermal performance.
—
EP
6
_______________________________________________________________________________________
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
Instead, switch on-time is terminated when the inductor
Detailed Description
current reaches the 780mA (typ) n-channel current limit,
The MAX8569A and MAX8569B compact high-efficien-
or when the 5µs maximum n-channel switch on-time is
reached. Following each on-cycle, the synchronous rec-
tifier turns on, shunts the MOSFET body diode, and the
inductor current ramps to zero before another cycle
begins. The next cycle occurs when the error compara-
tor senses that the output has fallen below the regulation
threshold.
cy step-up converters feature low-quiescent supply cur-
rent to ensure the highest possible efficiency over a
wide load range. With a minimum 1.5V input voltage,
these devices are well suited for applications with two
alkaline cells, two nickel-metal-hydride (NiMH) cells, or
one lithium-ion (Li+) cell. When SHDN is low, the output
is connected to the battery through the inductor and an
internal p-channel MOSFET. This allows the input bat-
tery to be used as a backup or real-time clock supply
when the converter is off by eliminating the voltage drop
across the MOSFET body diode. These devices are
ideal for low-power applications where a small footprint
is critical. The internal synchronous rectifier improves
efficiency significantly and reduces size and cost by
eliminating the need for an external Schottky diode.
Applications Information
Shutdown
Drive SHDN low to shut down the MAX8569A/
MAX8569B and reduce the input current to less than
1µA. During shutdown, the battery input is connected
to the output through the inductor and the internal syn-
chronous rectifier. This allows the input battery (rather
than a separate backup battery) to provide backup
power for devices such as an idled microcontroller,
SRAM, or real-time clock, without the usual diode for-
Control Scheme
The MAX8569A/MAX8569B feature a current-limited
control scheme that provides ultra-low quiescent current
and high efficiency over a wide output current range.
The switching cycles are not controlled by an oscillator.
ward drop. Drive SHDN to V
the IC for normal operation.
(logic-high) to enable
OUT
5
2
OUT
FB
3.3V OUTPUT
BATT
LX
C3
22µF
L1
R3
168kΩ
10µH
4
MAX8569A
1.5V TO 3V
INPUT
6
C1
10µF
R1
220kΩ
R4
100kΩ
1
SHDN
C2
GND
3
0.01µF
R2
1MΩ
Figure 1. Typical Application Circuit for MAX8569A
5
6
2
4
3.3V
OUT
BATT
OUTPUT
C3
22µF
L1
10µH
R1
100kΩ
MAX8569B
1.5V TO 3V
LX
INPUT
C1
RESET
OUTPUT
RST
10µF
ON
1
OFF
SHDN
GND
3
Figure 2. Typical Application Circuit for MAX8569B
_______________________________________________________________________________________
7
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
where R is the inductor series resistance and R
is
Low-Battery Cutoff
The SHDN trip threshold of the MAX8569A/MAX8569B
can be used as an input voltage detector that disables
the IC when the battery voltage falls to a set level. The
SHDN trip threshold is 1.228V. Use a resistor-divider to
set the battery-detection voltage (R1 and R2 in Figure 1).
Select R2 between 100kΩ and 1MΩ to minimize battery
drain. Calculate R1 as follows:
L
NCH
the R
of the internal n-channel MOSFET (0.3Ω typ).
DS(ON)
Capacitor Selection
Choose an output capacitor to achieve the desired out-
put ripple percentage.
2
C
> (0.5 x L x 0.780A2) / (r% x V
)
OUT
OUT
where L is the inductor value and r is the desired output
ripple in %. A 22µF ceramic capacitor is a good start-
ing value.
R1 = R2 x ((V
/ V
) - 1)
SHDN
OFF
where V
is the battery voltage at which the part
OFF
shuts down and V
= 1.228V. Note that input ripple
The input capacitor reduces the peak current drawn
from the battery and can be the same value as the out-
put capacitor. A larger input capacitor can be used to
further reduce the input ripple and improve efficiency.
SHDN
can sometimes cause false shutdowns. To minimize the
effect of ripple, connect a low-value capacitor (C2)
from SHDN to GND to filter out input noise. Select a C2
value so the R1, C2 time constant is above 2ms.
PC Board Layout and Grounding
Careful printed circuit layout is important for minimizing
ground bounce and noise. Keep the IC’s GND pin and
the ground leads of the input- and output-filter capaci-
tors less than 0.2in (5mm) apart. In addition, keep all
connections to the FB and LX pins as short as possible.
In particular, when using external feedback resistors,
locate them as close to FB as possible. To maximize
output power and efficiency and minimize output ripple
voltage, use a ground plane and solder the IC’s GND
directly to the ground plane. A sample layout is avail-
able in the MAX8569A/MAX8569B evaluation kit to
speed designs.
Power-On Reset (RST, MAX8569B)
The MAX8569B provides a power-on reset output (RST)
that goes high impedance when the output reaches 90%
of its regulation point. RST pulls low when the output is
below 90% of the regulation point. Connect a 100kΩ to
1MΩ pullup resistor from RST to OUT to provide a logic
control signal for a microprocessor. Connect RST to
GND when the reset function is not used.
Setting the Output Voltage (MAX8569A)
The output of the MAX8569A is adjustable from 2V to
5.5V. Connect a resistor-divider from the output to ground
with FB connected to the center tap to set the desired
output voltage (R3 and R4, Figure 1). Select R4 between
100kΩ and 1MΩ. R3 is then calculated as follows:
Chip Information
PROCESS: BiCMOS
R3 = R4 x ((V
/ V ) - 1)
FB
OUT
where V
1.228V.
is the desired output voltage and V
is
FB
OUT
Selector Guide
OUTPUT
VOLTAGE
PIN-
PACKAGE
TOP
MARK
PART
Inductor Selection
The control scheme of the MAX8569A/MAX8569B per-
mits flexibility in choosing an inductor. A 10µH inductor
performs well for most applications, but values from
4.7µH to 100µH can be used as well. Small inductance
values typically offer smaller physical size. Output
power is reduced when the inductance is large enough
to prevent the maximum current limit (780mA) from
being reached before the maximum on-time (5µs)
expires. For maximum output current, choose L so that:
MAX8569AEUT
MAX8569BEUT
MAX8569AETT
MAX8569BETT
MAX8569BETT30
Adjustable
Fixed 3.3V
Adjustable
Fixed 3.3V
Fixed 3.0V
SOT23-6
SOT23-6
TDFN
ABWK
ABWL
AJN
TDFN
AJO
TDFN
AJP
V
× 1µs
V
× 5µs
BATT(MAX)
0.78A
BATT(MIN)
0.78A
< L <
0.78A
2
0.78A
2
×
V
−
×
R
+ R
NCH L
(
)
BATT(MIN)
I
=
OUT(MAX)
V
OUT
8
_______________________________________________________________________________________
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
Package Information
(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.)
D2
D
A2
PIN 1 ID
N
0.35x0.35
b
[(N/2)-1] x e
REF.
PIN 1
INDEX
AREA
E
E2
DETAIL A
e
A1
k
C
C
L
L
A
L
L
e
e
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
1
-DRAWING NOT TO SCALE-
21-0137
G
2
_______________________________________________________________________________________
9
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
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.)
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
2.90
2.90
0.00
0.20
MAX.
0.80
3.10
3.10
0.05
0.40
A
D
E
A1
L
k
0.25 MIN.
0.20 REF.
A2
PACKAGE VARIATIONS
DOWNBONDS
ALLOWED
PKG. CODE
T633-1
N
6
D2
E2
e
JEDEC SPEC
MO229 / WEEA
MO229 / WEEA
MO229 / WEEC
MO229 / WEEC
MO229 / WEEC
b
[(N/2)-1] x e
1.90 REF
1.90 REF
1.95 REF
1.95 REF
1.95 REF
2.00 REF
2.40 REF
2.40 REF
1.50–0.10 2.30–0.10 0.95 BSC
1.50–0.10 2.30–0.10 0.95 BSC
1.50–0.10 2.30–0.10 0.65 BSC
1.50–0.10 2.30–0.10 0.65 BSC
1.50–0.10 2.30–0.10 0.65 BSC
0.40–0.05
0.40–0.05
0.30–0.05
0.30–0.05
0.30–0.05
NO
NO
T633-2
6
T833-1
8
NO
T833-2
8
NO
T833-3
8
YES
NO
T1033-1
T1433-1
T1433-2
10
14
14
1.50–0.10 2.30–0.10 0.50 BSC MO229 / WEED-3 0.25–0.05
1.70–0.10 2.30–0.10 0.40 BSC
1.70–0.10 2.30–0.10 0.40 BSC
- - - -
- - - -
0.20–0.05
0.20–0.05
YES
NO
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
2
-DRAWING NOT TO SCALE-
21-0137
G
2
10 ______________________________________________________________________________________
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
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.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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