MP5032 datasheet(14/18 Pages) MPS

14 / 18 page

MP5032

– QC 3.0 CONTROLLER WITH CURRENT-LIMIT SWITCH

MP5032 Rev r1.0

www.MonolithicPower.com

8/4/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

Current Limit (A)

RLIM=1.5k

Vbus (V)

3.2

6.6

9.8

2.7

2.08

Figure 5: Over-Current Threshold vs. VBUS

For Table 2, the external RLIMIT can set the

current-limit threshold. In QC 2.0 mode, the

9V/

12V output’s current-limit threshold varies

accordingly to maintain a fairly constant power

limit. In QC 3.0 mode, when 3.6V < VOUT <

6.6V, the MP5032 uses a 5V mode current limit.

When 6.6V

≤ VOUT < 9.8V, the MP5032 uses a

9V mode current limit. When VOUT ≥ 9.8V, the

MP5032 uses a 12V mode current limit.

If the over-current (OC) is triggered, and VOUT <

3.5V lasts for 2ms, the MP5032 enters hiccup

mode. If OC occurs but VOUT > 3.5V, the

MP5032 works in constant current (CC) limit

mode without hiccup. In this case, VOUT drops

while the output current increases slowly.

Figure 6 shows the curve of VOUT versus the

output current after triggering the 5V current

limit.

4.6

4.7

4.8

4.9

5.1

5.2

5.3

5.4

5.5

5.6

3.1

3.2

3.3

3.4

3.5

OUTPUT CURRENT (A)

Vin=5V

Figure 6: I-V Curve after OC is Triggered

In hiccup mode, the MP5032 turns off the

power MOSFET. The hiccup signal resets QC

mode to 5V. ADJ starts to change VIN to 5V,

and the current-limit threshold changes to the

5V spec. Two seconds (hiccup off-timer) later,

the MP5032 restarts to check the OC state. If

the OC still remains in 5V mode, the MP5032

follows the previous operation. If the OC does

not exist in 5V mode, the MP5032 recovers to

operate normally in 5V mode (see Figure 7).

THIC_ON

THIC_OFF

Vout

Iout

<3.5V

Figure 7: Over-Current Protection

Short-Circuit Protection (SCP)

If the load current increases rapidly due to a

short circuit, the current may exceed the current

limit threshold greatly before the control loop

can respond. If the current reaches an internal

secondary current-limit level (about 6A), a fast

turn-off circuit activates to turn off the power

MOSFET. This limits the peak current through

the switch to limit the input voltage drop. The

fast-off response time typical value is 700ns. If

the fast-off works, the power MOSFET remains

off for 300

μs. Afterward, the power MOSFET

turns on again. If the part is still in a short-circuit

condition, the MP5032 treats this as an over-

current condition to enter hiccup mode. After

the short-circuit condition is removed, the

MP5032 recovers automatically.

Auto Detection

The MP5032 integrates the USB dedicated

charging

port

auto-detect

function,

which

recognizes most mainstream portable devices.

It supports the following charging schemes:

• USB Battery Charging Specification BC1.2/

Chinese

Telecommunications

Industry

Standard YD/T 1591-2009

• Divider mode

• 1.2V/1.2V mode

• Qualcomm quick charge mode 3.0 and 2.0

Thermal Shutdown

Thermal shutdown prevents the chip from

operating at exceedingly high temperatures.

When the silicon die temperature exceeds

160°C, the entire chip shuts down. When the

temperature falls below its lower threshold

(typically 125°C), the chip is enabled again.

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