MAX20800
MPP Tracking DC-DC Converter
General Description
The MAX20800 family of Cell-String Optimizers enables
cell-string Maximum Power Point Tracking (MPPT),
providing superior photovoltaic (PV) module energy harvest
and reliability as compared to both standard panels and
those incorporating module level MPPT technologies.
Photovoltaic cells can only deliver maximum power under
specific electrical conditions that vary significantly with
exposed irradiance and temperature. Series connections
of PV cells creates a significant sensitivity to cell
mismatch, resulting in less than optimal power and energy
production under real-world conditions. The MAX20800
Cell-String Optimizer enables a string of PV cells to
deliver their collective maximum power into a wide range
of load conditions. This enhanced electrical flexibility
eliminates power loss from mismatch in PV strings
and arrays, ultimately improving energy production and
system design flexibility.
Additional unique advantages provided by the Cell-String
Optimizers:
• Reduction in performance degradation over the PV
module operating lifetime
• Elimination of high losses associated with bypass
diode conduction
• Limit the operating voltage of the PV module
Benefits and Features
●
Performs MPPT on 20-24 Series Connected PV Cells
●
Fast MPPT Reacts Quickly to Changing Conditions
●
Integrated Voltage-Limiting Clamps Output Voltage
●
Integrated Current-Limiting Clamps Output Current
●
Active Bypass function eliminates diodes and hot-
spots
●
Supports Panel Flash and Electroluminescence (EL)
Testing
●
Peak 99.1%, CEC 98.7% and Euro 98.3% Efficiency
Ordering Information
appears at end of data sheet.
MAX20800 Cell-String Optimizer Embedded in 60-Cell PV Panel
PV+
V
CC
C
IN
C
VCC
PV+
V
BST
C
BST
L
OUT
C
OUT
MAX20800
OUT
PV-
U
1
PV-
19-8575; Rev 4; 2/18
MAX20800
MPP Tracking DC-DC Converter
Absolute Maximum Ratings
Input Voltage (PV+) ..................................................-0.3V ~ 21V
Output Voltage (DC) .................................................-0.3V ~ 21V
Output Voltage (25ns) .................................................-6V ~ 25V
Peak Current (OUT) ............................................................±25A
Junction Temperature (T
J
)...............................................+150°C
IC Junction Temperature (2hrs) (Note 1) ........................ +200°C
Storage Temperature Range ............................ -65°C to +150°C
Peak Reflow Temperature ...............................................+260°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.
Operating Ratings
Input Voltage (V
PV+
) ................................................ 1.5V to 18V
Output Current (I
OUT
) ................................................ -4A to 12A
Junction Temperature (T
J
)...................................-40ºC to 150ºC
Package Information
PACKAGE CODE: 10FCQFN
Package Code
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Case (θ
JC
MAX)
1°C/W
P105A3F+1
21-100119
90-100039
For the latest package outline information and land patterns (footprints), go to
www.maximintegrated.com/packages.
Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
Note 1:
IC Junction Temperature can reach 200°C for a limited duration of two hours as in accordance with IEC61730 and UL1703
testing requirements.
www.maximintegrated.com
Maxim Integrated
│
2
MAX20800
MPP Tracking DC-DC Converter
Electrical Characteristics
PARAMETER
Input Voltage Range for MPPT
Input Quiescent Current
Typical values are at TA = +25°C. V
PV+
connected to 20 series-connected PV cells, unless otherwise noted. (Note 2)
SYMBOL
V
PV_+
I
PV_+
Open circuit
Active bypass
MAX20800T / MAX20800TA,
max sourcing current for MPPT mode
MAX20800TB,
max sourcing current for MPPT mode
MAX20800T / MAX20800TA,
max sourcing current
MAX20800TB, max sourcing current
I
OUT(MAX)_SC
V
MP(MAX)
Output-Voltage Limiting
V
OC(MAX)
Bypass-Voltage Drop (Note 3)
Overtemperature Threshold
Duty-Cycle Range
MPPT Loop Response Time
MPPT Efficiency
V
BYPASS
T
SHUTDOWN
D
t
MPPT
ŋ
MPPT
I
OUT
= 8A
Max sourcing current with OUT+ < 1V
MAX20800T, 10A output
MAX20800TA, 10A output
MAX20800TB, 10A output
MAX20800T, open circuit
MAX20800TA, open circuit
MAX20800TB, open circuit
PV_+ = 1.5V, I
OUT
= 12A
MPPT enable
MPPT disable
0
0.4
99.9
CONDITIONS
MIN
6.5
75
7
10.6
11.2
A
11.3
11.9
4.0
10.7
12.6
11.1
11.7
13.6
11.3
120
130
150
100
mV
°C
%
ms
%
V
12.0
12.6
TYP
MAX
15.5
UNITS
V
mA
I
OUT(MAX)_MPP
Output-Current Limiting
I
OUT(MAX)
Note 2:
Limits are 100% tested at T
A
= 32°C. Limits over the operating temperature range and relevant supply voltage range are
guaranteed by design and characterization.
Note 3:
Using the standard Maxim Evaluation Kit.
www.maximintegrated.com
Maxim Integrated
│
3
MAX20800
MPP Tracking DC-DC Converter
Typical Operating Characteristics
CURRENT vs. VOLTAGE BY IRRADIANCE
MAX20800, 1000 W/m²
MAX20800, 500 W/m²
MAX20800, 250 W/m²
STANDARD PV, 1000 W/m²
STANDARD PV, 250 W/m²
STANDARD PV, 500 W/m²
toc01
POWER vs. VOLTAGE BY IRRADIANCE
300
250
POWER (W)
MAX20800, 1000W/m
2
W/m²
STANDARD PV, 1000W/m
2
MAX20800, 1000
MAX20800, 500W/m
2
W/m²
STANDARD PV, 500W/m
2
MAX20800, 500
MAX20800, 250W/m
2
W/m²
STANDARD PV, 250W/m
2
MAX20800, 250
14
12
10
8
6
4
2
0
toc02
CURRENT (A)
200
150
100
50
0
0
5
10
VOLTAGE (V)
15
20
0
5
10
VOLTAGE (V)
15
20
CURRENT vs. VOLTAGE BY TEMPERATURE
14
12
10
8
6
4
2
0
toc03
MAX20800, 25°C
MAX20800, 75°C
STANDA P 25°C
RD V,
STANDA P 75°C
RD V,
300
250
POWER (W)
POWER vs. VOLTAGE BY TEMPERATURE
MAX20800, 25°C
MAX20800, 75°C
STANDARD PV, 25°C
STANDARD PV, 75°C
toc04
CURRENT (A)
200
150
100
50
0
0
5
10
VOLTAGE (V)
15
20
0
5
10
VOLTAGE (V)
15
20
100
CONVERSION EFFICIENCY (%)
CONVERSION EFFICIENCY vs. I
MP
toc05
100
99.9
99.8
MPPT EFFICIENCY (%)
MPPT EFFICIENCY vs. ISC
toc06
99
98
97
96
95
94
93
92
91
90
0
1
2
3
4
5
6
7
8
9
10
24 CELLS
20 CELLS
99.7
99.6
99.5
99.4
99.3
99.2
99.1
99
0
1
2
3
4
5
6
7
8
9
I
IMP
(A)
IMP (A)
www.maximintegrated.com
Maxim Integrated
│
4
MAX20800
MPP Tracking DC-DC Converter
Pin Configuration
PV+ 4
5 OUT
PV- 3
PV- 2
V
CC
1
6 V
BST
7 PV-
10
PV-
9
PV-
(BOTTOM VIEW)
8
PV-
Pin Description
PIN
1
2–3, 7–10
4
5
6
NAME
V
CC
PV-
PV+
OUT
V
BST
Internal Power Supply
PV Negative Power Input and Control Ground
PV Positive Power Input
MPPT Output
Internal Power Supply
FUNCTION
www.maximintegrated.com
Maxim Integrated
│
5
聊聊、笑笑、闹闹
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
