MAX1846EUB+ Maxim Integrated Products, MAX1846EUB+ Datasheet - Page 8

• Manufacturer Part Number: MAX1846EUB+
• Description: IC CNTRLR PWM HI EFF 10-UMAX
• Manufacturer: Maxim Integrated Products
• Type: Inverting, Flybackr

Specifications of MAX1846EUB+

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -0.5 ~ -200 V
• Current - Output: 5A
• Frequency - Switching: 100kHz ~ 500kHz
• Voltage - Input: 3 ~ 16.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Power - Output: 444mW
• Duty Cycle (max): 97 %
• Output Voltage: 1.25 V
• Mounting Style: SMD/SMT
• Switching Frequency: 500 KHz
• Operating Supply Voltage: 3 V to 16.5 V
• Supply Current: 0.75 mA
• Maximum Operating Temperature: + 85 C
• Fall Time: 200 ns
• Minimum Operating Temperature: - 40 C
• Output Power: 444 mW
• Rise Time: 200 ns
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Efficiency, Current-Mode,
Inverting PWM Controller
8
MAX1846
_______________________________________________________________________________________
10
—
—
—
—
1
2
3
4
5
6
7
8
9
PIN
MAX1847
10, 11
7, 9
12
13
14
15
16
1
2
3
4
5
6
8
NAME
COMP
SHDN
PGND
FREQ
SYNC
GND
POL
N.C.
REF
EXT
CS
VL
FB
IN
Sets polarity of the EXT pin. Connect POL to GND to set EXT for use with an external
PMOS high-side FET. Connect POL to VL to set EXT for use with an external NMOS low-
side FET in transformer-based applications.
VL Low-Dropout Regulator. Connect 0.47µF ceramic capacitor from VL to GND.
Oscillator Frequency Set Input. Connect a resistor (R
internal oscillator frequency from 100kHz (R
R
Frequency section.
Compensation Node for Error Amp/Integrator. Connect a series resistor/capacitor network
from COMP to GND for loop compensation. See Design Procedure.
1.25V Reference Output. REF can source up to 500µA. Bypass with a 0.1µF ceramic
capacitor from REF to GND.
Feedback Input. Connect FB to the center of a resistor-divider connected between the
output and REF. The FB threshold is 0.
No Connection
Shutdown Control. Drive SHDN low to turn off the DC-DC controller. Drive high or connect
to IN for normal operation.
Analog Ground. Connect to PGND.
Negative Rail for EXT Driver and Negative Current-Sense Input. Connect to GND.
P osi ti ve C ur r ent- S ense Inp ut. C onnect a cur r ent- sense r esi stor ( R
External MOSFET Gate-Driver Output. EXT swings from IN to PGND.
Power-Supply Input
Operating Frequency Synchronization Control. Drive SYNC low or connect to GND to set
the internal oscillator frequency with R
signal to externally set the converter’s operating frequency. DC-DC conversion cycles
initiate on the rising edge of the input clock signal. Note that when driving SYNC with an
external signal, R
FREQ
is still required if an external clock is used at SYNC. See Setting the Operating
FREQ
must still be connected to FREQ.
FREQ
FUNCTION
. Drive SYNC with a logic-level clock input
FREQ
= 500kΩ) to 500kHz (R
FREQ
) from FREQ to GND to set the
C S
Pin Description
) b etw een C S and
FREQ
= 76.8kΩ).