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MAX17500AEUB+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
General Description
The MAX17499/MAX17500 current-mode PWM con-
trollers contain all the control circuitry required for the
design of wide-input-voltage isolated and nonisolated
power supplies. The MAX17499 is well suited for low
input voltage (9.5V DC to 24V DC) power supplies. The
MAX17500 is well suited for universal input (rectified
85V AC to 265V AC) or telecom (-36V DC to -72V DC)
power supplies.
The ICs contain an internal error amplifier that regulates
the tertiary winding output voltage that is used in prima-
ry-side-regulated isolated power supplies. Primary-side
regulation eliminates the need for an optocoupler. An
input undervoltage lockout (UVLO) is provided for pro-
gramming the input-supply start voltage and to ensure
proper operation during brownout conditions. An open-
drain UVLO flag output, with 210μs internal delay,
allows the sequencing of a secondary-side controller.
The input-supply start voltage is externally programma-
ble with a voltage-divider. A UVLO/EN input is used to
shut down the devices. Internal digital soft-start elimi-
nates output voltage overshoot.
The MAX17500 has an internal bootstrap UVLO with
large hysteresis that requires a minimum 23.6V for start-
up. The MAX17499 does not have the internal bootstrap
UVLO and can be biased directly from a minimum volt-
age of 9.5V.
The switching frequency for the ICs is programmable
with an external resistor. The MAX17499A/MAX17500A
provide a 50% maximum duty-cycle limit, while the
MAX17499B/MAX17500B provide a 75% maximum
duty-cycle limit. These devices are available in 10-pin
μMAX
®
packages and are rated for operation over the
-40°C to +125°C temperature range.
Features
o Current-Mode Control
o Programmable Switching Frequency Up to 625kHz
o Accurate UVLO Threshold (1%)
o Open-Drain UVLO Flag Output with Internal Delay
o 36V to 72V Telecom Voltage Range
o Universal Offline Input Voltage Range
Rectified 85V AC to 265V AC (MAX17500)
o 9.5V to 24V Input (MAX17499)
o Digital Soft-Start
o Internal Bootstrap UVLO with Large Hysteresis
(MAX17500)
o Internal Error Amplifier with 1.5% Accurate
Reference
o 50µA (typ) Startup Supply Current
o 50% Maximum Duty-Cycle Limit
(MAX17499A/MAX17500A)
o 75% Maximum Duty-Cycle Limit
(MAX17499B/MAX17500B)
o 60ns Cycle-by-Cycle Current-Limit Propagation
Delay
o Available in Tiny 10-Pin µMAX Packages
Applications
1/2, 1/4, and 1/8 Brick Power Modules
High-Efficiency, Isolated Telecom Power
Supplies
Networking/Servers
Isolated Keep-Alive Power Supplies
12V Boost and SEPIC Regulators
Isolated and Nonisolated High-Brightness LED
Power Supplies
Industrial Power Conversion
MAX17499/MAX17500
Current-Mode PWM Controllers with
Programmable Switching Frequency
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-5485; Rev 1; 7/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Warning: The ICs are designed to work with high voltages. Exercise caution.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
EVALUATION KIT
AVAILABLE
Selector Guide appears at end of data sheet.
PART D
MAX
(%) STARTUP VOLTAGE (V) TEMP RANGE PIN-PACKAGE
MAX17499AAUB+ 50 9.5 -40°C to +125°C 10 μMAX
MAX17499BAUB+ 75 9.5 -40°C to +125°C 10 μMAX
MAX17500AAUB+ 50 22 -40°C to +125°C 10 μMAX
MAX17500BAUB+ 75 22 -40°C to +125°C 10 μMAX
μMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX17499/MAX17500
Current-Mode PWM Controllers with
Programmable Switching Frequency
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +12V (for MAX17500, bring V
IN
up to 23.6V for startup), 10nF bypass capacitors at IN and V
CC
, R12 = 15kΩ (MAX17499A/
MAX17500A), R12 = 7.5kΩ (MAX17499B/MAX17500B), R15 = 1kΩ, C6 = 100nF (see the
Typical Application Circuit
), NDRV = open,
V
UVLO/EN
= +1.4V, V
FB
= +1.0V, COMP = open, V
CS
= 0V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 1)
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.
IN to GND ...............................................................-0.3V to +30V
IN Clamp (internal shunt) Current .........................................5mA
V
CC
to GND............................................................-0.3V to +13V
FB, COMP, UVLO/EN, RT, CS to GND .....................-0.3V to +6V
UFLG to GND .........................................................-0.3V to +30V
NDRV to GND.............................................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
10-Pin μMAX (derate 5.6mW/°C above +70°C) ........444.4mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
UVLO/STARTUP
Bootstrap UVLO Wake-Up Level V
SUVR
V
IN
rising (MAX17500 only) 19.68 21.6 23.60 V
Bootstrap UVLO Shutdown Level V
SUVF
V
IN
falling (MAX17500 only) 9.05 9.74 10.43 V
UVLO/EN Wake-Up Threshold V
ULR2
UVLO/EN rising 1.215 1.23 1.245 V
UVLO/EN Shutdown Threshold V
ULF2
UVLO/EN falling 1.14 1.17 1.20 V
UVLO/EN Input Current I
UVLO
V
UVLO/EN
≤ 2V -50 +50 nA
UVLO/EN Hysteresis 60 mV
IN Supply Current In UVLO I
START
V
IN
= 19V, MAX17500 only when in
bootstrap UVLO
50 90 μA
IN Input Voltage Range V
IN
MAX17499 only 9.5 24.0 V
UVLO/EN steps up from 1V to 1.4V 3
UVLO/EN to UFLG Propagation
Delay (Figure 3)
UVLO/EN steps down from 1.4V to 1V 0.6
μs
t
EXTR
UVLO/EN steps up from 1V to 1.4V 3 10 ms
UVLO/EN to NDRV Propagation
Delay (Figure 3)
t
EXTF
UVLO/EN steps down from 1.4V to 1V 150 210 300 μs
t
BUVR
V
IN
steps up from 9V to 24V (MAX17500
only)
5
Bootstrap UVLO Propagation
Delay
t
BUVF
V
IN
steps down from 24V to 9V
(MAX17500 only)
1
μs
UFLG Low Output Voltage V
UFLG
I
UFLG
= 5mA sinking 1.5 V
UFLG High Output Leakage
Current
V
UFLG
= 25V 0.1 1 μA
INTERNAL SUPPLY
V
CC
Regulator Set Point V
CCSP
V
IN
= 10.8V to 24V, sinking 1μA to 20mA
from V
CC
7.0 10.5 V
IN Supply Current After Startup I
IN
V
IN
= 24V 2 4 mA
Shutdown Supply Current UVLO/EN = low 50 90 μA
MAX17499/MAX17500
Current-Mode PWM Controllers with
Programmable Switching Frequency
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +12V (for MAX17500, bring V
IN
up to 23.6V for startup), 10nF bypass capacitors at IN and V
CC
, R12 = 15kΩ (MAX17499A/
MAX17500A), R12 = 7.5kΩ (MAX17499B/MAX17500B), R15 = 1kΩ, C6 = 100nF (see the
Typical Application Circuit
), NDRV = open,
V
UVLO/EN
= +1.4V, V
FB
= +1.0V, COMP = open, V
CS
= 0V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GATE DRIVER
R
ON
(
LOW
)
Measured at NDRV sinking 100mA 2 4
Driver Output Impedance
R
ON
(
HIGH
)
Measured at NDRV sourcing 20mA 4 10
Ω
Driver Peak Sink Current 1A
Driver Peak Source Current 0.65 A
PWM COMPARATOR
Comparator Offset Voltage V
PWM
V
COMP
- V
CS
1.24 1.38 1.54 V
CS Input Bias Current I
CS
V
CS
= 0V -4 +4 μA
Comparator Propagation Delay t
PWM
Change in V
CS
= 0.1V 60 ns
CURRENT-LIMIT COMPARATOR
Current-Limit Trip Threshold V
CS
900 1000 1100 mV
CS Input Bias Current I
CS
V
CS
= 0V -4 +4 μA
Propagation Delay from
Comparator Input to NDRV
t
PDCS
100mV overdrive 60 ns
IN CLAMP VOLTAGE
IN Clamp Voltage V
INC
2mA sink current (Note 2) 24.1 26.1 29.0 V
ERROR AMPLIFIER
Voltage Gain R
LOAD
= 100kΩ 80 dB
Unity-Gain Bandwidth R
LOAD
= 100kΩ, C
LOAD
= 200pF 2 MHz
Phase Margin R
LOAD
= 100kΩ, C
LOAD
= 200pF 65 D eg r ees
FB Input Offset Voltage ±1 mV
COMP High Voltage I
COMP
= 0A 2.5 V
COMP Low Voltage I
COMP
= 0A 1.1 V
Source Current 0.5 mA
Sink Current 0.5 mA
Reference Voltage V
REF
(Note 3) 1.230 V
Reference Voltage Accuracy -1.5 +1.5 %
FB Input Bias Current -50 +50 nA
COMP Short-Circuit Current 8mA
DIGITAL SOFT-START
1984
NDRV
cycles
Soft-Start Duration t
SS
f
SW
= 350kHz 5.6 ms
Reference Voltage Steps During
Soft-Start
31 Steps
Reference Voltage Step 39.67 mV
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX17500AEUB+T

Mfr. #:
Buy MAX17500AEUB+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers w/Prog Switch Frequency
Lifecycle:
New from this manufacturer.
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