ATR0621P_08 Datasheet, PDF (28/31 Pages) ATMEL Corporation – GPS Baseband GPS Baseband

11. LDO18
The LDO18 is a built in low dropout voltage regulator which can be used if the host system does
not provide the core voltage VDD18.
Table 11-1. Electrical Characteristics of LDO18
Parameter
Conditions
Min. Typ. Max. Unit Type*
Supply voltage LDO_IN
2.3
3.6
V
D
Output voltage
(LDO_OUT)
1.65 1.8 1.95 V
A
Output current
(LDO_OUT)
80
mA
A
Current consumption
After startup, no load, at room
temperature
80
µA
A
Current consumption
Standby mode (LDO_EN = 0), at
room temperature
1
5
µA
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design
parameter
For well-defined start up of LDO18, LDO_IN needs to be connected to LDOBAT_IN.
12. LDOBAT and Backup Domain
The LDOBAT is a built in low dropout voltage regulator which provides the supply voltage
VBAT18 for the RTC, backup SRAM, P9, P13, P22, P31, NSLEEP and NSHDN. The LDOBAT
voltage regulator switches in battery mode if LDOBAT_IN falls below 1.5V.
Table 12-1. Electrical Characteristics of LDOBAT
Parameter
Conditions
Min. Typ. Max. Unit Type*
Supply voltage
LDOBAT_IN
2.3
3.6
V
D
Supply voltage VBAT
1.5
3.6
V
D
Output voltage (VBAT18) If switch connects to LDOBAT_IN.
1.65 1.8 1.95 V
A
Output current (VBAT18) No external load allowed
1.5 mA D
Current consumption
LDOBAT_IN⁽¹⁾
After startup (sleep/backup mode), at
room temperature
15 µA
A
Current consumption
VBAT⁽¹⁾
After startup (backup mode and
LDOBAT_IN = 0V), at room
temperature
10 µA
A
Current consumption
After startup (normal mode), at room
temperature
1.5 mA C
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design
parameter
Note: 1. If no current is caused by outputs (pad output current as well as current across internal
pull-up resistors)
28 ATR0621P
4890H–GPS–08/08