19-3671; Rev 0; 5/05
IT
TION K
VALUA
E
BLE
AVAILA
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
Features
o
Over 200mA Available Output Current
o
1.5V to 5.5V Input Voltage Range
o
BATT Connected to OUT in Shutdown for Backup
Power
o
Up to 95% Efficiency
o
7µA Typical Quiescent Current
o
<1µA Shutdown Supply Current
o
Internal Synchronous Rectifier
o
750mA Switch Current Limit
o
RST
Output (MAX8569B)
o
Adjustable Output Voltage (MAX8569A)
o
Fixed 3.0V or 3.3V Output Voltage (MAX8569B)
General Description
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.
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.
MAX8569A/MAX8569B
Applications
Medical Diagnostic
Equipment
Digital Cameras
PDAs and Smartphones
Cordless Phones
Battery Backup
PC Cards
Local 3.3V or 5V Supply
Ordering Information
PART
MAX8569AEUT-T*
MAX8569AETT+
MAX8569BEUT-T*
MAX8569BETT+
MAX8569BETT30+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
(U6FH-6)
6 TDFN 3mm x 3mm
(T633-1)
6 SOT23-6
(U6FH-6)
6 TDFN 3mm x 3mm
(T633-1)
6 TDFN 3mm x 3mm
(T633-1)
Typical Operating Circuit
BATT
2V
INPUT
ON
OFF
SHDN
GND
MAX8569B
RST
POWER-ON
RESET
OUT
3.3V, 200mA
OUTPUT
LX
*Future
product—contact factory for availability.
Selector Guide appears at end of data sheet.
+Denotes
lead-free packaging.
Pin Configurations
OUT
LX
TOP VIEW
FB (RST)
TOP VIEW
SHDN 1
MAX8569A
(MAX8569B)
6 FB (RST)
6
5
4
BATT 2
5 OUT
MAX8569A
(MAX8569B)
GND 3
4 LX
+
1
SHDN
2
BATT
3
GND
SOT23
( ) ARE FOR THE MAX8569B
+ DENOTES LEAD-FREE PACKAGING
TDFN
________________________________________________________________
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
MAX8569A/MAX8569B
ABSOLUTE MAXIMUM RATINGS
BATT, LX, OUT, FB,
RST
to GND .............................-0.3V to +6V
SHDN
to GND...........................................-0.3V to (V
OUT
+ 0.3V)
LX Current ....................................................................1.5A Peak
Continuous Power Dissipation (T
A
= +70°C)
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
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
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
SHDN
= V
OUT
= 3.3V, V
BATT
= 2.0V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Battery Input Range
Startup Voltage
R
LOAD
= 2.6kΩ
MAX8569A
Output Voltage
MAX8569BETT30
MAX8569B
Feedback Threshold
Feedback Bias Current
n-Channel On-Resistance
p-Channel On-Resistance
n-Channel Switch Current Limit
Switch Maximum On-Time
Synchronous Rectifier Zero-
Crossing Current
OUT Quiescent Current
OUT Shutdown Current
BATT Quiescent Current
BATT Shutdown Current
SHDN
Logic-Low
MAX8569A
MAX8569A, V
FB
= 1.27V
I
LX
= 100mA
I
LX
= 100mA
T
A
= +25°C
T
A
= -40°C to +85°C
V
OUT
= 2.8V
T
A
= +25°C
T
A
= -40°C to +85°C
V
OUT
= 3.5V, V
FB
= 1.3V (Note 2)
V
OUT
= 3.5V, V
SHDN
= V
FB
= 0V
V
OUT
= 3.5V, V
FB
= 1.3V (Note 3)
V
OUT
= 3.5V, V
SHDN
= 0V
650
600
3.5
3
0
4
0.05
3
0.01
5
25
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
2.0
2.94
2.925
3.233
3.217
1.208
1.203
3.5
4
0.3
0.3
750
0.7
0.9
920
975
6.5
50
60
10
1
10
1
0.3
1.228
3.300
3.0
CONDITIONS
MIN
1.5
1.22
1.24
5.5
3.06
3.075
3.366
3.373
1.248
1.253
20
V
nA
Ω
Ω
mA
µs
mA
µA
µA
µA
µA
V
V
TYP
MAX
5.5
1.5
UNITS
V
V
2
_______________________________________________________________________________________
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V
SHDN
= V
OUT
= 3.3V, V
BATT
= 2.0V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SHDN
Threshold
CONDITIONS
Rising edge,
100mV hysteresis (typ),
V
OUT
= 2.8V
V
OUT
= 5.5V
I
RST
= 1mA, V
OUT
= 2.5V
V
RST
= 5.5V
Relative to OUT,
3.3V for MAX8569B,
3.0V for MAX8569BETT30
V
OUT
= 5.5V
V
BATT
= 2V, V
OUT
= 3.3V
V
BATT
= 2V, V
OUT
= 3.3V, Figures 1 or 2, I
LOAD
= 40mA
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
85
85
0.1
1
90
90
1
150
200
88
95
%
97
150
nA
mA
%
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
MIN
1.185
1.170
13
13
0.2
100
TYP
1.228
MAX
1.271
V
1.286
100
nA
V
nA
UNITS
MAX8569A/MAX8569B
SHDN
Input Bias Current
RST
Low Voltage
RST
Leakage Current
RST
Threshold
LX Leakage Current
Maximum Load Current
Efficiency
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
MAX8569A/MAX8569B
Typical Operating Characteristics
(Circuit of Figure 2, V
OUT
= 3.3V, V
BATT
= +2V, T
A
= +25°C, circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
V
OUT
= 5V
MAX8569 toc01
EFFICIENCY vs. LOAD CURRENT
V
OUT
= 3.3V
V
IN
= 2.5V
90
V
IN
= 2V
EFFICIENCY (%)
85
V
IN
= 1.5V
80
75
70
65
MAX8569 toc02
100
95
90
EFFICIENCY (%)
85
80
75
70
65
1
10
100
V
IN
= 4.2V
V
IN
= 3.3V
V
IN
= 2.5V
95
1000
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
V
OUT
= 2.5V
95
90
EFFICIENCY (%)
85
80
75
70
65
60
1
10
100
1000
LOAD CURRENT (mA)
V
IN
= 1.5V
V
IN
= 2V
MAX8569 toc03
MAXIMUM OUTPUT CURRENT
vs. BATTERY VOLTAGE
MAX8569 toc04
100
600
MAXIMUM OUTPUT CURRENT (mA)
500
400
300
V
OUT
= 5V
200
100
0
1.5
2.5
3.5
4.5
V
OUT
= 2.5V
V
OUT
= 3.3V
5.5
BATTERY VOLTAGE (V)
STARTUP VOLTAGE vs. LOAD RESISTANCE
1.32
STARTUP VOLTAGE (V)
1.30
1.28
1.26
1.24
1.22
1.20
10
100
R
LOAD
(Ω)
1k
10k
MAX8569 toc05
OUTPUT VOLTAGE AND INPUT CURRENT
vs. INPUT VOLTAGE (SHUTDOWN, NO LOAD)
6
5
OUTPUT VOLTAGE (V)
4
3
2
1
0
0
1
2
3
4
5
6
BATTERY VOLTAGE (V)
I
BATT
V
OUT
MAX8569 toc06
1.34
6
5
4
3
2
1
0
BATTERY CURRENT (µA)
4
_______________________________________________________________________________________
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
MAX8569A/MAX8569B
Typical Operating Characteristics (continued)
(Circuit of Figure 2, V
OUT
= 3.3V, V
BATT
= +2V, T
A
= +25°C, circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE AND INPUT CURRENT
vs. INPUT VOLTAGE (SHUTDOWN, 200mA LOAD)
6
5
OUTPUT VOLTAGE (V)
4
3
2
I
BATT
1
0
0
1
2
3
4
5
6
BATTERY VOLTAGE (V)
1
0.5
0
0
0
1
2
3
4
5
6
BATTERY VOLTAGE (V)
0.5
0
V
OUT
MAX8569 toc07
OUTPUT VOLTAGE AND INPUT CURRENT
vs. INPUT VOLTAGE (ON, 330Ω)
4.5
4.0
BATTERY CURRENT (µA)
OUTPUT VOLTAGE (V)
3.5
3.0
2.5
2.0
1.5
1.0
I
BATT
V
OUT
MAX8569 toc08
6
5
4
3
2
4.5
4.0
BATTERY CURRENT (µA)
3.5
3.0
2.5
2.0
1.5
1.0
OUTPUT VOLTAGE AND INPUT CURRENT
vs. INPUT VOLTAGE (ON, 16Ω LOAD)
4.5
4.0
OUTPUT VOLTAGE (V)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
1
2
3
4
5
6
BATTERY VOLTAGE (V)
I
BATT
V
OUT
MAX8569 toc09
ON/OFF RESPONSE (R
LOAD
= 33Ω)
4.5
4.0
BATTERY CURRENT (µA)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100µs/div
V
OUT
MAX8569 toc10
1V/div
V
IN
1V/div
LOAD TRANSIENT
MAX8569 toc11
LINE TRANSIENT
MAX8569 toc12
100mV/div
V
OUT
(AC-COUPLED)
V
OUT
(AC-COUPLED)
100mV/div
200mA
I
OUT
20mA
V
IN
2.5V
2V
100µs/div
100ms/div
_______________________________________________________________________________________
5
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