MAX17499 Maxim Integrated Products, MAX17499 Datasheet - Page 7

• Manufacturer Part Number: MAX17499
• Description: (MAX17499 / MAX17500) Current-Mode PWM Controllers
• Manufacturer: Maxim Integrated Products

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(V
UVLO/EN
PIN
1
2
3
4
5
6
= +1.4V, V
UVLO/EN
NAME
COMP
UFLG
5.0
4.6
4.2
3.8
3.4
3.0
CS
FB
RT
-40
SOURCING 20mA
_______________________________________________________________________________________
NDRV HIGH-OUTPUT IMPEDANCE
FB
-15
Externally Programmable Undervoltage Lockout. UVLO/EN programs the input start voltage. Connect
UVLO/EN to GND to disable the device. NDRV stops switching approximately 210μs after the UVLO/EN
voltage falls below 1.17V.
Open-Drain Undervoltage Flag Output. UFLG is asserted low as soon as the UVLO/EN voltage falls below its
threshold.
Error-Amplifier Inverting Input
Error-Amplifier Output
Current-Sense Input. Current-sense connection for PWM regulation and cycle-by-cycle current limit.
Connect to the high side of the sense resistor. An RC filter may be necessary to eliminate leading-edge
spikes. Current-limit trip voltage is 1V.
Oscillator Timing Resistor Input. An RC network may be required to reduce jitter (see the Typical Application
Circuit).
= +1V, COMP = open, V
vs. TEMPERATURE
TEMPERATURE (°C)
10
Programmable Switching Frequency
Current-Mode PWM Controllers with
35
TOP VIEW
60
Typical Operating Characteristics (continued)
CS
UVLO/EN
85
COMP
UFLG
= 0V, T
CS
FB
1
2
3
4
5
A
+
= +25°C, unless otherwise noted.)
MAX17499
MAX17500
μMAX
FUNCTION
10
9
8
7
6
100
-20
-40
-60
80
60
40
20
0
IN
V
NDRV
GND
RT
0.1
CC
ERROR AMPLIFIER OPEN-LOOP GAIN
1
AND PHASE vs. FREQUENCY
10 100
FREQUENCY (Hz)
1k 10k 100k 1M 10M 100M
PHASE
Pin Configuration
GAIN
Pin Description
MAX17499/500 toc22
120
80
40
0
-40
-80
-120
-160
-200
7
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