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MAX1678EUA

P1-P3P4-P6P7-P9P10-P12
MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
4 _______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 7 (Fixed Mode, 3.3V) or Figure 8 (Adjustable Mode), T
A
= +25°C, unless otherwise noted.)
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.4V, L1 = 22µH)
20
MAX1678-01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.0V
V
IN
= 1.5V
L1 = 22µH
SUMIDA CD43-220
R1 = 200kΩ, R2 = 200kΩ
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.4V, L1 = SUMIDA 47µH)
20
MAX1678-02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.0V
V
IN
= 1.5V
L1 = 47µH
SUMIDA CD43-470
R1 = 200kΩ, R2 = 200kΩ
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.4V, L1 = TDK 47µH)
20
MAX1678-03
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.0V
V
IN
= 1.5V
L1 = 47µH
TDK NLC453232T-470K
R1 = 200kΩ, R2 = 200kΩ
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5.0V, L1 = 22µH)
20
MAX1678-07
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 4.5V
V
IN
= 2.0V
L1 = 22µH
SUMIDA CD43-220
R1 = 619kΩ, R2 = 200kΩ
V
IN
= 3.0V
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V, L1 = SUMIDA 47µH)
20
MAX1678-05
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.5V
V
IN
= 2.0V
L1 = 47µH
SUMIDA CD43-470
FB = GND
V
IN
= 1.5V
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V, L1 = TDK 47µH)
20
MAX1678-06
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.5V
V
IN
= 2.0V
L1 = 47µH
TDK NLC453232T-470K
FB = GND
V
IN
= 1.5V
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5.0V, L1 = SUMIDA 47µH)
20
MAX1678-08
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 4.5V
V
IN
= 3.0V
L1 = 47µH
SUMIDA CD43-470
R1 = 619kΩ, R2 = 200kΩ
V
IN
= 2.0V
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5.0V, L1 = TDK 47µH)
20
MAX1678-09
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 4.5V
V
IN
= 3.0V
L1 = 47µH
TDK NLC453232-470K
R1 = 619kΩ, R2 = 200kΩ
V
IN
= 2.0V
V
IN
= 1.2V
V
IN
= 0.85V
MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
_______________________________________________________________________________________
5
90
50
COILCRAFT
EFFICIENCY WITH DIFFERENT INDUCTORS
55
85
80
DS1608C-473
DT1608C-223
CD43-470
47µH
47µH
47µH
47µH
22µH
47µH
22µH
22µH
CD43-220
LQH4N470K
LQH3C470K
NLC453232T-470K
NLC453232T-220K
MAX1678-10
EFFICIENCY (%)
75
70
65
60
V
BATT
= 1.2V
V
OUT
= 3.3V
I
LOAD
= 20mA
SUMIDA
MURATA
TDK
1000
10
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
NO-LOAD BATTERY CURRENT
vs. INPUT VOLTAGE
MAX1678-11
INPUT VOLTAGE (V)
NO-LOAD BATTERY CURRENT (µA)
100
V
OUT
= 5.0V
R1 = 3MΩ, R2 = 1MΩ
V
OUT
= 3.0V
FB = GND
L1 = 47µH
SUMIDA CD43-470
V
OUT
= 2.4V
R1 = 1MΩ, R2 = 1MΩ
45
0
-40 100
BATT AND OUT QUIESCENT CURRENT
vs. TEMPERATURE
10
5
40
35
30
MAX1678-12
TEMPERATURE (°C)
QUIESCENT CURRENT (µA)
0-20 80604020
25
20
15
V
BATT
= 1.3V
V
OUT
= 3.6V
FB = GND
I
OUT
I
BATT
12
0
0 6
SHUTDOWN BATTERY CURRENT
vs. INPUT VOLTAGE
2
10
8
MAX1678-13
INPUT VOLTAGE (V)
SHUTDOWN BATTERY CURRENT (µA)
21 543
6
4
3.3V FIXED MODE
L1 = 47µH
SUMIDA CD43-470
9.0
7.6
-40 100
ON-TIME CONSTANT (K)
vs. TEMPERATURE
7.8
8.8
8.6
MAX1678-14
TEMPERATURE (°C)
ON-TIME CONSTANT (V-µs)
0-20 80604020
8.4
8.2
8.0
V
BATT
= 1.3V
1.3
0.6
0 35
MINIMUM START-UP INPUT VOLTAGE
vs. LOAD CURRENT
0.7
1.2
1.1
MAX1678-15
LOAD CURRENT (mA)
START-UP INPUT VOLTAGE (V)
105 30252015
1.0
0.9
0.8
L1 = 47µH
SUMIDA CD43-470
3.3V FIXED MODE
WITH EXTERNAL
SCHOTTKY DIODE
(FIGURE 3)
WITHOUT
DIODE
140
0
0 5.0
MAXIMUM LOAD CURRENT
vs. INPUT VOLTAGE
(L1 = SUMIDA 47µH)
20
120
100
MAX1678-17
INPUT VOLTAGE (V)
MAXIMUM LOAD CURRENT (mA)
1.51.00.5 4.53.5 4.03.02.52.0
80
60
40
L1 = 47µH
SUMIDA CD43-470
V
OUT
= 5.0V
V
OUT
= 3.3V
V
OUT
= 2.4V
140
0
0 5.0
MAXIMUM LOAD CURRENT
vs. INPUT VOLTAGE
(L1 = TDK 47µH)
20
120
100
MAX1678-18
INPUT VOLTAGE (V)
MAXIMUM LOAD CURRENT (mA)
1.51.00.5 4.53.5 4.03.02.52.0
80
60
40
L1 = 47µH
TDK NLC453232T-470K
V
OUT
= 5.0V
V
OUT
= 3.3V
V
OUT
= 2.4V
Typical Operating Characteristics (continued)
(Circuit of Figure 7 (Fixed Mode, 3.3V) or Figure 8 (Adjustable Mode), T
A
= +25°C, unless otherwise noted.)
MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
6 _______________________________________________________________________________________
A
B
C
SWITCHING WAVEFORM
MAX1678-19
V
OUT
= 3.3V, V
BATT
= 1.2V, I
LOAD
= 10mA, C
OUT
= 10µF,
L1 = SUMIDA CD43-470
A: LX, 2V/div B: V
OUT
, 50mV/div AC COUPLED
C: INDUCTOR CURRENT, 100mA/div
5µs/div
Typical Operating Characteristics (continued)
(Circuit of Figure 7 (Fixed Mode, 3.3V) or Figure 8 (Adjustable Mode), T
A
= +25°C, unless otherwise noted.)
Pin Description
PIN
Battery-Power InputBATT1
FUNCTIONNAME
A
B
C
L
O
AD-TRAN
S
IENT RE
S
P
O
N
S
E
MAX1678-20
V
OUT
= 3.3V, V
BATT
= 1.2V, C
OUT
= 10µF,
L1 = SUMIDA CD43-470,
A: V
OUT
, 50mV/div, AC COUPLED B: INDUCTOR CURRENT,
C: LOAD, 2mA to 12mA 100mA/div
100µs/div
A
B
LINE-TRANSIENT RESPONSE
MAX1678-21
V
OUT
= 3.3V, V
BATT
= 1.2V, I
LOAD
= 10mA, C
OUT
= 10µF,
L1 = SUMIDA CD43-470
A: V
OUT
, 50mV/div, AC COUPLED B: V
IN
, 1V/div, 1.2V to 2.2V
200µs/div
A
B
C
POWER-UP RESPONSE
MAX1678-22
V
OUT
= 3.3V, V
BATT
= 1.2V, I
LOAD
= 10mA, C
OUT
= 10µF,
L1 = SUMIDA CD43-470
A: V
OUT
, 1V/div B: INDUCTOR CURRENT, 100mA/div
C: SHDN, 5V/div
100µs/div
Power-Fail Input. When the voltage at PFI is below 614mV, PFO sinks current.PFI2
Active-Low Shutdown. Connect SHDN to BATT for normal operation.SHDN
4
Open-Drain Power-Fail Output. PFO sinks current when PFI is below 614mV.PFO3
GroundGND6
Power Output and IC Power Input (bootstrapped). OUT is the feedback input for 3.3V operation. Connect
the filter capacitor close to OUT.
OUT8
N-Channel MOSFET Switch Drain and P-Channel Synchronous-Rectifier DrainLX7
Dual-Mode Feedback Input. Connect FB to GND for fixed-output operation (3.3V). Connect FB to a feed-
back-resistor network for adjustable output voltage operation (2V to 5.5V). FB regulates to 1.23V.
FB5
P1-P3P4-P6P7-P9P10-P12

MAX1678EUA

Mfr. #:
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Description:
IC REG BOOST AD/3.3V 550MA 8UMAX
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