SN99057

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The TI SN99057RSBR is a power management IC used by the Vita in conjunction with the bq27520-G1 battery fuel gauge to manage the battery. There is a USB interface that is connected to a switch TS3USB31RSER with the main Kermit USB. When the device is powered off and connected to a PC, this chip is likely what the USB sees. TI has stated that “the SN99057RSBR part was a custom device manufactured for a specific company.”

The device is now obsolete nor do we have access to the datasheet.

The current hypothesis is that this IC is responsible to managing battery charging.

Pinout

Pin Type Description
1 ? N/C
2 I/O To bq27520-G1 A2 - SOC_INT, indicates battery charged > threshold
3 PWR
4 PWR
5 PWR
6 I/O To TS3USB31 USB D+
7 I/O To TS3USB31 USB D-
8 I/O To Kermit GPIO B20
9 I/O To Kermit GPIO A23
10 I/O To Kermit GPIO A25
11 ? To passives
12 ? To capacitor
13 PWR
14 PWR
15 PWR Net 1 (Battery)
16 PWR Net 1 (Battery)
17 PWR Net 1 (Battery)
18 PWR Net 2
19 PWR Net 2
20 PWR Net 2
21 PWR
22 ? N/C
23 GND
24 GND
25 PWR Net 3
26 PWR Net 3
27 PWR Net 4
28 PWR Net 4
29 PWR Net 4
30 PWR Net 4
31 PWR Net 5
32 PWR Net 5
33 ? To capacitor
34 PWR Net 6 (USB VBUS)
35 PWR Net 6 (USB VBUS)
36 GND
37 I/O To right daughterboard
38 I/O To syscon (G8)
39 I2C SDA
40 I2C SCL