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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.

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
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
39	I2C	SDA
40	I2C	SCL