MAX13253 Datasheet, PDF (7/14 Pages) Maxim Integrated Products – 1A, Spread-Spectrum, Push-Pull, Transformer Driver for Isolated Power Supplies

MAX13253
Pin Configuration
1A, Spread-Spectrum, Push-Pull, Transformer
Driver for Isolated Power Supplies
TOP VIEW
T1 PGND T2 GND FAULT
10 9 8 7 6
MAX13253
+
*EP
1234 5
V_DD CLK HICLK EN SPRD
TDFN
*EXPOSED PAD—CONNECT TO GND
Pin Description
PIN
NAME
FUNCTION
1
V_DD
Power-Supply Input. Bypass V_DD to GND with a 1µF capacitor as close as possible to the device.
2
CLK
Clock Input. Connect CLK to GND to enable internal clocking. Apply a clock signal to CLK to enable
external clocking.
3
HICLK
Internal Oscillator Frequency Select Input. Drive HICLK high to set the internal oscillator to a 600kHz
switching frequency. Drive HICLK low to set the internal oscillator to a 250kHz switching frequency.
4
EN
Active-Low Enable Input. Drive EN low to enable the device. Drive EN high to disable the device.
Spread-Spectrum Enable Input. Drive SPRD high to enable ±4% spread spectrum on the internal
5
SPRD oscillator. Drive SPRD low or leave it unconnected to disable spread spectrum. SPRD does not have any
effect when an external clock is used.
6
FAULT
Active-Low Fault Open-Drain Output. The FAULT open-drain transistor turns on when an overcurrent or
overtemperature condition occurs.
7
GND Logic and Analog Ground
8
T2
Transformer Drive Output 2
9
PGND
Power Ground. The transformer primary current flows through PGND. Ensure a low-resistance
connection to ground.
10
T1
Transformer Drive Output 1
—
EP
Exposed Pad. Internally connected to GND. Connect EP to a large ground plane to maximize thermal
performance; not intended as an electrical connection point.
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