MAX1901ETJ 查看數據表（PDF） - Maxim Integrated
零件编号
产品描述 (功能)
生产厂家
MAX1901ETJ
Maxim Integrated
MAX1901ETJ Datasheet PDF : 33 Pages
| |||
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
PIN
SSOP
QFN
1
29
2
30
3
31
4
1
5
2
6
3
7
4
8
5
9
7
10
8
11
9
12
10
13
11
14
12
Pin Description
NAME
CSH3
CSL3
FB3
12OUT
(MAX1902)
STEER
(MAX1901/
MAX1904)
VDD
(MAX1902)
SECFB
(MAX1901/
MAX1904)
SYNC
TIME/ON5
GND
REF
SKIP
RESET
FB5
CSL5
CSH5
FUNCTION
Current-Sense Input for the 3.3V SMPS. Current-limit level is 100mV referred to CSL3.
Current-Sense Input. Also serves as the feedback input in fixed-output mode.
Feedback Input for the 3.3V SMPS. Regulates at FB3 = REF (approx. 2.5V) in
adjustable mode. FB3 is a dual-mode input that also selects the 3.3V fixed output
voltage setting when connected to GND. Connect FB3 to a resistor-divider for
adjustable-output mode.
12V/120mA Linear-Regulator Output. Input supply comes from VDD. Bypass 12OUT to
GND with 1µF (min).
Logic-Control Input for Secondary Feedback. Selects the PWM that uses a transformer
and secondary feedback signal (SECFB):
STEER = GND: 3.3V SMPS uses transformer
STEER = VL: 5V SMPS uses transformer
Supply Voltage Input for the 12OUT Linear Regulator. Also connects to an internal
resistor-divider for secondary winding feedback and to an 18V overvoltage shunt
regulator clamp.
Secondary Winding Feedback Input. Normally connected to a resistor-divider from an
auxiliary output. SECFB regulates at VSECFB = 2.5V (see the Secondary Feedback
Regulation Loop section). Connect to VL if not used.
Oscillator Synchronization and Frequency Select. Connect to VL for 500kHz operation;
connect to GND for 333kHz operation. Can be driven at 400kHz to 583kHz for external
synchronization.
Dual-Purpose Timing Capacitor Pin and ON/OFF Control Input. See the Power-Up
Sequencing and ON/OFF Controls section.
Low-Noise Analog Ground and Feedback Reference Point
2.5V Reference Voltage Output. Bypass to GND with 1µF (min).
Logic-control input that disables idle mode when high. Connect to GND for normal use.
Active-Low Timed Reset Output. RESET swings GND to VL. Goes high after a fixed
32,000 clock-cycle delay following power-up.
Feedback Input for the 5V SMPS. Regulates at FB5 = REF (approx. 2.5V) in adjustable
mode. FB5 is a dual-mode input that also selects the 5V fixed output voltage setting
when connected to GND. Connect FB5 to a resistor-divider for adjustable-output
mode.
Current-Sense Input for the 5V SMPS. Also serves as the feedback input in fixed-output
mode, and as the bootstrap supply input when the voltage on CSL5/VL is > 4.5V.
Current-Sense Input for the 5V SMPS. Current-limit level is 100mV referred to CSL5.
_______________________________________________________________________________________ 9
Share Link: