Hi Kevin,
There is no one component direct match among Hittite Microwave Products form ADI. Since it does not have to be a single chip solution, you can go with multiple components for a solution. There are not any single ended to differential RF/MW amplifier at HMC from ADI product line either. You can use an external 180 degree SMD hybrid coupler from various manufacturers, or design one with lumped components.
There will be some loss on the hybrid so you will need some extra gain to compensate that. You can use HMC457QS16G which has 26 dB typical gain at 2 GHz. Then you need the 180 degree hybrid at the output.
In order to reduce the power consumption you can go with a two stage amplifier solution, like HMC311SC70 + HMC 475ST89.
You can use HMC311SC70 as a first stage amplifier which has 14 dB gain and 15 dBm OP1dB @ 2 GHz. Then you can use a gain block with higher Pout like HMC789ST89, HMC475ST89 or HMC636ST89. Best choice can be HMC475ST89 due to lower power consumption. You can use a pi attenuator in between two amplifiers to adjust and remove the extra gain.
Best,
Kagan