MAX17101 查看數據表（PDF） - Maxim Integrated

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MAX17101

Dual Quick-PWM, Step-Down Controller with Low-Power LDO, RTC Regulator

Maxim Integrated 

Dual Quick-PWM, Step-Down Controller

with Low-Power LDO, RTC Regulator

Pin Description (continued)

PIN

NAME

FUNCTION

14

ON1 Enable Input for SMPS1. Drive ON1 high to enable SMPS1. Drive ON1 low to shut down SMPS1.

15

DH1 High-Side Gate-Driver Output for SMPS1. DH1 swings from LX1 to BST1.

16

LX1

Inductor Connection for SMPS1. Connect LX1 to the switched side of the inductor. LX1 is the lower supply

rail for the DH1 high-side gate driver.

17

BST1 Boost Flying-Capacitor Connection for SMPS1. Connect to an external capacitor as shown in Figure 1. An

optional resistor in series with BST1 allows the DH1 turn-on current to be adjusted.

18

DL1 Low-Side Gate-Driver Output for SMPS1. DL1 swings from PGND to VDD.

19

VDD

Supply-Voltage Input for the DL_ Gate Drivers. Connect to a 5V supply. Also connect to the drain of the

BST diode switch.

Secondary Feedback Input. The secondary feedback input forces the SMPS1 output into ultrasonic mode

when the SECFB voltage drops below its 2V threshold voltage. This forces DL1 and DH1 to switch,

20

SECFB allowing the system to refresh an external low-power charge pump being driven by DL1 (see Figure 1 for

the Standard Application Circuit—Main Supply). Connect SECFB to VCC (the 5V bias supply) to disable

secondary feedback.

21

AGND Analog Ground. Connect backside exposed pad to AGND.

22

PGND Power Ground

23

DL2 Low-Side Gate-Driver Output for SMPS2. DL2 swings from PGND to VDD.

24

BST2

Boost Flying-Capacitor Connection for SMPS2. Connect to an external capacitor as shown in Figure 1. An

optional resistor in series with BST2 allows the DH2 turn-on current to be adjusted.

25

LX2

Inductor Connection for SMPS2. Connect LX2 to the switched side of the inductor. LX2 is the lower supply

rail for the DH2 high-side gate driver.

26

DH2 High-Side Gate-Driver Output for SMPS2. DH2 swings from LX2 to BST2.

27

ON2 Enable Input for SMPS2. Drive ON2 high to enable SMPS2. Drive ON2 low to shut down SMPS2.

Open-Drain Power-Good Output for SMPS2. PGOOD2 is low when the output voltage is more than 150mV

(typ) below the REFIN2 voltage or more than 16% below the preset voltage, during soft-start, in shutdown,

28 PGOOD2 and when the fault latch has been tripped. After the soft-start circuit has terminated, PGOOD2 becomes

high impedance if the output is in regulation. PGOOD2 is blanked—forced high-impedance state—when a

dynamic REFIN transition is detected.

Pulse-Skipping Control Input. This three-level input determines the operating mode for the switching

regulators:

29

SKIP

High (VCC) = forced-PWM operation

Open/REF (2V) = ultrasonic mode

GND = pulse-skipping mode

30

OUT2 Output Voltage-Sense Input for SMPS2. OUT2 is an input to the Quick-PWM on-time one-shot timer. OUT2

also serves as the feedback input for the preset 3.3V (REFIN2 = VCC) and 1.05V (REFIN2 = RTC).

Valley Current-Limit Adjustment for SMPS2. The GND - LX2 current-limit threshold is 1/10 the voltage

31

ILIM2 present on ILIM2 over a 0.2V to 2V range. An internal 5μA current source allows this voltage to be set with

a single resistor between ILIM2 and analog ground.

32

REFIN2 External Reference Input for SMPS2. REFIN2 sets the feedback-regulation voltage (VOUT2 = VREFIN2).

Connect REFIN2 to RTC for fixed 1.05V operation. Connect REFIN2 to VCC for fixed 3.3V operation.

—

EP

Exposed Pad. Connect the backside exposed pad to AGND.

14 ______________________________________________________________________________________

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